JPH0895552A - Image processing method and apparatus - Google Patents

Abstract

(57) [Summary] [Object] To provide an image processing method and apparatus capable of performing various color operations. [Structure] In the control register, a priority number and color operation enable, and either a screen, a character, or a dot are set as a unit for setting them. Based on this setting, the priority determination unit 40 determines the priority, and the color calculation enable control unit 70 determines the color calculation enable. Also, in the control register,
One of a plurality of color calculation ratios is set for each screen, and the color calculation ratio control unit 60 selects one of the color calculation ratios for each screen based on the priority. Based on these, the color calculation unit 110 performs color calculation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing method and apparatus for performing color calculation based on the priority of each screen.

[0002]

2. Description of the Related Art Conventionally, in an image processing device used in a game machine, a plurality of background images (still images) displaying a background are displayed.
In addition, a foreground image (moving image) for displaying a character appearing in the game is overlaid and displayed on the screen of the raster scan monitor. The display priority (hereinafter referred to as priority) is determined for each of the background image and the foreground image, and only the foreground image or the background image with high priority is displayed at a position where they overlap each other. The priority is determined by the priority number, and as an example, an image with a large priority number is displayed in the foreground. In this priority number, the background image is usually designated in plane units or cell units, and the foreground image is designated in character units.

For example, the background image BG0 shown in FIG.
There are a background image BG1 shown in (b) and a foreground image FG shown in (c), and the priority number of the background image BG0 is "4", the priority number of the background image BG1 is "2", and the foreground image FG is It is assumed that the priority number of the character CHR is “6”. When these are overlaid, the character C is displayed as shown in FIG.
HR → background image BG0 → background image BG1 appears to be in the foreground.

Further, as shown in FIG. 22, the background image BG0
In some cases, the background image BG1 may be seen through. This is obtained by performing the color arithmetic processing on the portion overlapping with the background image BG0 regardless of the priority of the background image BG1. This color calculation processing is an effect that the image in the back can be seen through the image in the foreground by adding the color data of the pixels on the same coordinates of the two overlapping screens as it is or by dividing the addition result by 2. Is the process of issuing.

Whether or not this color calculation processing is performed depends on the RO
It is specified for each screen in the program data stored in M. This program data is executed by being read by the CPU.

[0006]

By the way, in the conventional image processing apparatus, since the priority of the background image is set in each screen unit or cell unit, all the characters on each background image have the same priority. It could not be partially changed. Similarly, whether or not the color calculation is performed is set for each screen of the background image, so that it is impossible to perform the color calculation on only a part of the background image.

Further, in the color calculation process, the color data of the pixels of the two screens are either added as they are or the result of the addition is simply divided by 2 (added by 1: 1). Therefore, the transparency is always the same. It was difficult to perform a display in which the image at the back gradually merges with the image at the front and gradually appears. Further, even in the portion where the foreground image and the plurality of background images overlap, it is only possible to perform color calculation for two screens such as the foreground image and the background image or the background image and the background image.

The present invention has been proposed in view of the above problems of the prior art, and its first object is to perform image processing capable of setting the priority of image data in cell units or dot units. To provide a method.

A second object of the present invention is to provide an image processing method capable of designating whether or not color calculation is performed on the same screen in screen units, cell units or dot units. is there.

A third object of the present invention is to provide an image processing method capable of changing the color calculation ratio.

A fourth object of the present invention is to provide an image processing method capable of performing color calculation for three screens.

A fifth object of the present invention is to provide an image processing method capable of using a line color screen.

A sixth object of the present invention is to provide an image processing apparatus capable of changing the priority for each dot on the same screen.

A seventh object of the present invention is to provide an image processing apparatus capable of setting the priority in cell units or dot units.

An eighth object of the present invention is to provide an image processing apparatus capable of performing the above setting with a simple structure.

A ninth object of the present invention is to provide an image processing apparatus capable of designating whether or not color calculation is performed for each cell or each dot.

A tenth object of the present invention is to provide an image processing apparatus capable of performing the above-mentioned designation with a simple structure.

An eleventh object of the present invention is to provide an image processing apparatus capable of selecting from a plurality of types of color calculation ratios.

A twelfth object of the present invention is to provide an image processing apparatus capable of making the above selection with a simple structure.

A thirteenth object of the present invention is to provide an image processing apparatus capable of performing color calculation of three screens.

A fourteenth object of the present invention is to provide an image processing apparatus which can use a line color screen.

A fifteenth object of the present invention is to provide an image processing apparatus capable of using a monochromatic line color screen.

A sixteenth object of the present invention is to provide an image processing apparatus capable of performing color calculation on a screen on which movement / rotation conversion processing is performed and a line color screen.

[0024]

In order to achieve the above object, the image processing method according to the invention of claim 1 reads image data for a plurality of screens from an image memory,
In an image processing method for generating a video signal based on those priorities, as a unit for setting priorities of the plurality of screens, "screen", "cells" forming the screens, and "dots" forming the cells It is characterized in that any one of them is selected.

In the image processing method according to the second aspect of the present invention, the image data of a plurality of screens are read from the image memory, the priorities thereof are compared, and
In the image processing method of performing color calculation in the highest priority portion of the designated screen and generating a video signal based on the result, the "screen" is a unit for setting whether or not to perform the color calculation, The feature is that any one of "cells" forming the screen and "dots" forming the cells is selected, and whether or not color calculation is performed is set according to the selected unit. There is.

According to the image processing method of the present invention, the image data of a plurality of screens are read from the image memory and their priorities are compared with each other.
In the image processing method in which color calculation is performed in a portion having the highest priority on the designated screen and a video signal is generated based on the result, a color calculation ratio that is a calculation ratio with other screens when performing the color calculation. Is set, and any one of the color calculation ratios is selected for each of the plurality of screens, and the image data of the screen and the priority of the screen are specified in the part where the priority of the specified screen is the highest. When performing color calculation with the image data of the second highest screen,
Based on the selected color calculation ratio, one of the color calculation ratio set for the designated screen and the color calculation ratio set for the screen with the second highest priority is selected. hand,
The feature is that color calculation is performed.

According to the image processing method of the present invention, the image data of a plurality of screens are read out from the image memory, their priorities are compared, and
In the image processing method of performing a color calculation in a portion of the designated screen having the highest priority as compared with other screens and generating a video signal based on the result, the portion of the designated screen having the highest priority In, the color calculation is performed on the image data of the screen having the second highest priority and the image data of the third highest priority,
The result is used as image data of the screen having the second highest priority, and color calculation is performed with the image data of the designated screen.

According to the image processing method of the present invention, the image data of a plurality of screens are read out from the image memory, their priorities are compared, and
In the image processing method of performing color calculation in a portion of the designated screen having the highest priority as compared with other screens and generating a video signal based on the result, a line for color calculation in the image memory. The color data for each line constituting the color screen is stored as a line color screen table, and the color data of the line color screen is stored in the line color screen table of the screen having the second highest priority in the portion having the highest priority of the specified screen. Image data is used, and color calculation is performed with the image data of the specified screen.

According to the sixth aspect of the present invention, there is provided an image processing apparatus which reads out image data of a plurality of screens from an image memory and generates a video signal based on the priority of the plurality of screens. It is characterized in that it is provided with a priority setting means for setting each of the constituent dots.

An image processing apparatus according to a seventh aspect of the present invention is an image processing apparatus which reads out image data of a plurality of screens from an image memory and generates a video signal based on the priority of each of the screens. Priority number setting means for setting a priority number to be represented, and as a unit for setting the priority number, any one of a "screen", a "cell" forming the screen, and a "dot" forming the cell When the priority setting selection means for selecting, and "dot" is selected as the unit by the priority setting selection means, the priority number is changed in dot units, and when "cell" is selected as the unit, the Change the priority number in cell units It is characterized by comprising a priority changing means.

An image processing apparatus according to an eighth aspect of the present invention is the image processing apparatus according to the seventh aspect, further comprising priority bit detection means for detecting the priority bit set in the cell unit from the image data, The priority changing means, when the "cell" is selected as the unit by the priority setting selecting means, the priority bit is set to the least significant bit of the priority number of the dots forming the cell,
When "dot" is selected, among the dots forming the cell in which the priority bit is turned on, the least significant bit of the priority number of the dot whose image data matches a predetermined value is turned on. Is characterized by.

According to a ninth aspect of the present invention, an image processing apparatus reads out image data of a plurality of screens from an image memory, compares the priorities thereof, and
It is set whether or not to perform the color calculation in the image processing device that performs the color calculation in a portion having the highest priority compared to other screens in the designated screen and generates a video signal based on the result. As a unit, a color calculation setting selection unit that selects any one of a “screen”, a “cell” that forms the screen, and a “dot” that forms the cell; When "screen" is selected as the unit, whether or not to perform the color calculation is set for each screen, when "cell" is selected, it is set for each cell, and when "dot" is selected, it is set for each dot. And a color calculation enable setting means for setting the color calculation enable setting means.

According to a tenth aspect of the present invention, in the image processing apparatus according to the ninth aspect, there is provided color operation bit detecting means for detecting the color operation bit set in the cell unit from the image data. The color calculation enable setting means selects the "cell" as the unit by the color calculation setting means for setting whether or not to perform color calculation for each of the plurality of screens and the color calculation setting selection means. Then, in the screen set to perform color calculation by the color calculation setting means, the color calculation is set to be performed only on the cells for which the color calculation bit is turned on, and the "dot" is set as the unit. When selected, the color calculation bit is displayed on the screen set to perform color calculation by the color calculation setting means. The image data of the dots constituting the emission in a cell is characterized by having a color arithmetic enable changing means for setting to perform color operation only for the dots that match a predetermined value.

An image processing apparatus according to the invention of claim 11 reads out image data of a plurality of screens from an image memory, compares the priorities thereof, and
In the image processing apparatus that performs color calculation in a portion having the highest priority among the designated screens as compared with other screens, and generates a video signal based on the result, the other screens when performing the color calculation Which is one of a plurality of color calculation ratios that are set.
It is characterized in that it is provided with a color calculation ratio setting means for selecting one.

An image processing apparatus according to a twelfth aspect of the present invention reads out image data of a plurality of screens from an image memory, compares the priorities of the image data, and
In the image processing apparatus that performs color calculation in a portion of the designated screen having the highest priority compared to other screens and generates a video signal based on the result, the portion of the designated screen having the highest priority Priority determining means for determining the priority of each screen, and a color for selecting one of a plurality of types of color calculation ratios for each of the plurality of screens, which is a calculation ratio with another screen. The calculation ratio setting means and the color calculation ratio of the designated screen in the highest priority part of the designated screen, and the color calculation of the screen in which the priority is determined to be the second highest in that part. A color calculation ratio selecting means for selecting one of the ratio and the color calculation ratio selection A color calculation means for performing a color calculation with the image data of the designated screen and the image data of the screen determined to have the second highest priority based on the color calculation ratio selected by the step. It is characterized by that.

An image processing apparatus according to a thirteenth aspect of the present invention reads out image data of a plurality of screens from an image memory, compares the priorities of the image data, and
In the image processing apparatus that performs color calculation in a portion of the designated screen having the highest priority compared to other screens and generates a video signal based on the result, the portion of the designated screen having the highest priority Priority determining means for determining the priority of each screen in, and the image data of the screen in which the priority is determined to be the second highest in the part where the priority of the specified screen is the highest,
It is characterized by comprising a color calculation means for performing a color calculation with the image data of the screen determined to be the third highest and performing a color calculation with the result and the image data of the specified screen.

An image processing apparatus according to a fourteenth aspect of the present invention reads out image data of a plurality of screens from an image memory, compares the priorities of the image data, and
In an image processing device that performs color calculation in a portion having the highest priority compared to other screens in the designated screen and generates a video signal based on the result, a line for color calculation is stored in the image memory. Control means for storing color data for each line constituting a color screen as a line color screen table, address designating means for designating an address of the color data read from the line color screen table, and address designating means. And a capturing means for sequentially capturing the color data of the address, and the color data captured by the capturing means in the portion having the highest priority of the designated screen is used as the image data of the screen having the second highest priority. Screen image data Perform color operation is characterized by comprising a color calculation means.

According to the fifteenth aspect of the present invention, in the image processing apparatus according to the fourteenth aspect, the color calculation means uses only the color data stored at the head of the line color screen table to perform the color calculation. It is characterized by doing.

According to a sixteenth aspect of the present invention, in the image processing apparatus according to the fourteenth or fifteenth aspect of the present invention, a movement / rotation conversion means for performing an operation of movement / rotation conversion processing on image data of any one of the plurality of screens. The control means represents, in the image memory, a coefficient used for the calculation of the movement rotation conversion process, and combines the coefficient data set for each dot of the screen with the line color screen data. Stored as combined data, the moving / rotating conversion unit uses the coefficient data of the combined data to perform an operation for the moving / rotation conversion process, and the color calculating unit includes It is characterized in that color calculation of the designated screen and the line color screen is performed using color data.

[0040]

According to the first aspect of the present invention, the priority can be set not only in the screen but also in cell units and dot units.

According to the second aspect of the present invention, it is possible to specify whether or not the color calculation is performed not only on the same screen but also on a cell basis and a dot basis on the same screen.

According to the third aspect of the present invention, the color calculation ratio is selected for each screen, and in the portion where the priority of the designated screen is the highest, the color calculation ratio and the priority of the designated screen are the second. Since it is possible to select one of the extremely high screen color calculation ratio, the color calculation ratio can be changed, and various color calculations can be performed.

According to the fourth aspect of the present invention, color calculation is performed on the image data of the screen having the second highest priority and the image data of the screen having the third highest priority, and the result and the screen having the highest priority are subjected to color calculation. To perform the calculation
Color calculation of 3 screens is possible.

According to the fifth aspect of the invention, various color operations can be performed using the line color screen in which the color is set for each line.

According to the sixth aspect of the invention, by setting the priority for each dot, the priority can be changed on the same screen.

According to the invention described in claim 7, when the dot is selected by the priority setting selecting means as a unit for setting the priority number, the priority number set by the priority number setting means is changed for each dot. , When a cell is selected,
The priority number is changed for each cell. As a result, the priority can be set not only on the screen but also on a dot or cell basis.

According to the present invention, when the cell is selected as a unit for setting the priority number, the value of the priority bit detected from the image data is set as the least significant bit of the priority number and the dot is selected. Then, among the dots forming the cell in which the value of the priority bit is on, the least significant bit of the priority number of the dot whose image data matches the predetermined value is turned on.

According to the ninth aspect of the present invention, when the "screen" is selected by the color calculation setting selection means, it is set by the color calculation enable setting means whether or not the color calculation is performed for each screen. When "cell" is selected, it is set in cell units, and when "dot" is selected, it is selected in dot units.

According to the tenth aspect of the invention, when the "cell" is selected by the color calculation setting selection means, the color calculation bit is turned on in the screen set to perform the color calculation by the color calculation setting means. Set to perform color calculation only for cells that are
When is selected, the color operation is set to be performed only on the dots of which the image data matches the predetermined value among the dots forming the cell.

According to the eleventh aspect of the present invention, the color calculation ratio setting means can set any one of a plurality of types of color calculation ratios set. The color calculation ratio can be changed.

According to the twelfth aspect of the invention, color calculation is performed between the image data of the designated screen and the image data of the screen having the second highest priority in that portion in the highest priority portion of the screen. At this time, either one of the color calculation ratio of the designated screen and the color calculation ratio of the screen having the second highest priority is selected, and the color calculation is performed based on the selected color calculation ratio.

According to the thirteenth aspect of the invention, in the portion of the designated screen having the highest priority, the image data of the screen judged to have the second highest priority and the image data of the screen judged to have the third highest priority, Since the color calculation is performed with the result and the color calculation is performed with the result and the image data of the designated screen, the color calculation of three screens is possible.

According to the fourteenth aspect of the present invention, the color data is sequentially fetched from the line color screen table stored in the image memory, and the color data and the image of the screen are displayed in the designated screen having the highest priority. Perform color calculation with data. Since color data is set for each line on the line color screen, the color of the image that is the calculation result changes for each line.

According to the fifteenth aspect of the invention, a color operation is performed using only the color data stored at the head of the line color screen table, so that the line color screen table can be used as a single line color screen.

According to the sixteenth aspect of the present invention, when the movement / rotation conversion processing is performed on the designated screen, the movement / rotation conversion means performs an operation using the coefficient data of the combined coefficient data. The color calculation means calculates using the color data of the combined coefficient data.

[0056]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an image processing apparatus according to the present invention will be described below with reference to the drawings.

(1) Overall Configuration of Embodiment FIG. 1 is a block diagram showing an embodiment of an image processing apparatus according to the present invention. In the figure, a bus 15 is connected to a CPU 15 that controls the entire system, a ROM 16 that stores a program, a sprite engine 17 that performs image processing of a foreground image, and a scroll engine 18 that performs image processing of a plurality of background images. There is. The sprite engine 17 is also connected to a command RAM 19 that stores command data from the CPU and image data of the foreground image, and a frame buffer 21 that expands the image data of the foreground image. The scroll engine 18 has a video RAM (hereinafter, referred to as V RAM) that stores image data for each dot of the background image.
RAM) 22 and color RAM 23 are connected.

<Sprite Engine 17> The sprite engine 17 selects and reads image data of a foreground image such as a character from the command RAM 19 and rotates, enlarges,
After processing such as reduction and color calculation, it is written in a predetermined address of the frame buffer 21. The sprite engine 17 also sequentially reads the image data for one frame written in the frame buffer 21, and the bus 14
It is supplied directly to the scroll engine 18 without going through. C
The PU 15 supplies the command data to the sprite engine 17 by executing the program in the ROM 16. This command data is data (drawing command) indicating a drawing command for the foreground image, and the sprite engine 17 uses the command RAM 1 as a command table.
9 is written. Then, it is read by the sprite engine 17 and executed by being set in an internal system register. <Foreground Image Data> The foreground image data FGDT supplied from the sprite engine 17 to the scroll engine 18 is represented by 16 bits for each pixel. The image data FGDT includes dot color data DCL that specifies a color, a priority number selection bit PRNSL, and a color calculation ratio selection bit CCRSL.
And the number of bits of each differs depending on the type (sprite type) of the image data FGDT.

FIG. 2 shows an example of the image data FGDT for one pixel. As shown in this figure, the lower 11 bits D0
~ D10 is the dot color data DCL.
The bits are used as the address of the color RAM 23. The characters of the foreground picture are stored in the command RAM 19 at 4 bits or 8 bits per dot, but when writing to the frame buffer 21, the color RAM designated for each character is placed on the upper side of the character data.
The address offset value is added. Next 2 bits D1
1 to D12 are color calculation ratio selection bits CCRSL, which are used to select a color calculation ratio when performing color calculation. The color calculation and the color calculation ratio will be described later.

Further, the next two bits D13 to D14 are priority number selection bits PRNSL, which are used for comparing priorities of respective overlapping pixels when a plurality of images are displayed in an overlapping manner. In this case, pixels with high priority are displayed with priority over pixels with low priority. The most significant bit D15 is a window flag or a shadow bit and is used when performing window processing or shadow processing on the character data.

<Scroll engine 18> Also, VRA
M22 stores pattern data composed of image data of cells of 8 × 8 pixels in the vertical and horizontal directions. Further, when the above cells are laid out horizontally and vertically by 28 × 40 cells to form one frame of background images BG0, BG1, BG2, BG3, pattern name data is stored corresponding to the arrangement. This pattern name data is stored for each frame, and is composed of a bit indicating the start address of the pattern data stored in the VRAM 22 and a special function bit. As for this special function bit,
Priority bit PRI and color operation bit C
C and are set.

Further, the color RAM 23 stores RGB data which is color data when the image data of the foreground image and the background image is in the palette format.

The scroll engine 18 has a background image generator 31, a display controller 32, and a control register (not shown). The control register is CP.
The contents can be rewritten by U15. The background image generation unit 31 also reads the pattern name data PN from the VRAM 22 and reads the pattern data corresponding to this pattern name data PN. Then, the background image generation unit 31 synchronizes with the horizontal synchronization signal,
Data of the pattern name data PN excluding the address of the pattern data and one of the pattern data
Image data for pixels BG0DT, BG1DT, BG2D
T and BG3DT are output to the display control unit 32.

Further, from the display control section 32 of the scroll engine 18, RGB data for one pixel having the highest priority is output in synchronization with the horizontal synchronizing signal, and D /
It is supplied to the A converter 23. D / A converter 24
Converts the RGB data into an analog signal and outputs it as a video signal. This video signal is supplied to a monitor (not shown) and displayed on the TV screen.

(2) Priority Judgment and Color Calculation Processing Next, the priority judgment and color calculation processing performed in the display control section 32 will be described with reference to FIG.

(A) Contents of Control Register First, the contents set in the control register in relation to the operation of the display control unit 32 will be described below.

A. Sprite control register Sprite color calculation condition bit: Priority number FGPN value selected for each character or whether the foreground image is color-computed with another screen, or the highest order of color data selected from color RAM 23 for each dot It can be specified by the value of the bit. When one of the following conditions is satisfied by this designation, the foreground color calculation is performed for each character or each dot.

1) Only when (Priority number) ≤ (Color calculation condition number) 2) Only when (Priority number) = (Color calculation condition number) 3) When (Priority number) ≥ (Color calculation condition number) Only 4) Only when the most significant bit of color data is 1. Sprite color operation condition number bit: Color operation condition number used for the above color operation conditions.

Sprite type bit: The sprite type is designated by the bit configuration of each data.

B. Priority number register Priority number bit for sprite: Multiple priority number bits are set as the foreground priority number and are selected by the priority number selection bit PRNSL of the foreground image data FGDT.

Priority number for scrolling: A priority number is set for each background image. This priority number is normally used for the entire screen, but the value of the least significant bit can be changed for each character or dot by setting a special priority mode described later.

C. Special priority mode register Special priority mode bit: Set the function to change the least significant bit of the above priority number for each character or dot. This function can be used to change the priority of only a part of the background image. The special priority modes are shown below.

<Mode 0> The least significant bit of the priority number is designated for each screen.

The value of the scrolling priority number bit corresponding to each background image is used as it is.

<Mode 1> The least significant bit of the priority number is designated for each character.

The value of the priority bit PRI (described later) is used as the least significant bit of the priority number.

<Mode 2> The least significant bit of the priority number is designated for each dot.

In the character pattern in which the priority bit PRI is designated as "1", the least significant bit of the priority number is set to 1 only for the dot which matches the dot color code designated in the special function code bit described later, and other than that. Fixes the least significant bit to 0.

D. Special function code register Special function code bit: It is set corresponding to, for example, the lower 4 bits of the dot color code that uses the special function.

E. Color calculation ratio register Sprite color calculation ratio bit: A plurality of color calculation ratios for the foreground image are set, and are selected by the color calculation ratio selection bit CCRSL of the foreground image data FGDT.

Color operation ratio bit for scroll: A color operation ratio is set for each background image.

A total of 32 steps of top image: second image = 31: 1 to 0:32 can be designated for both sprite and scroll. The top image and the second image will be described later.

F. Color operation control register Color operation enable bit: Specifies whether or not color operation is performed. The bit value for the screen on which the color calculation is performed is “1”. Whether or not to perform color calculation is usually specified for the entire screen, but it can be specified for each character or dot or by the most significant bit of color data by setting the special color calculation mode described later. You can

Color operation ratio mode bit: The following mode is designated as the color operation ratio mode.

<Mode 0> The color calculation ratio is specified on the top image side.

Regardless of the screen of the second image, the value of the color calculation ratio of the foreground image or the background image which becomes the top image is used.

<Mode 1> The color calculation ratio is designated on the second image side.

The color calculation ratio can be changed depending on the screen of the second image, and the value of the color calculation ratio of the line color screen can be used.

Color operation mode bit: The following modes are designated as the color operation mode. <Mode 0> Add according to the value of the color operation ratio register.

<Mode 1> The value is added as it is.

G. Special color calculation mode register Special color calculation mode bit: The color calculation enable described above can be specified not only for the entire screen but also for each character or each dot.

<Mode 0> Color calculation enable is designated for each screen.

When the value of the color operation enable bit corresponding to each background image is 1, color operation is performed.

<Mode 1> Color operation enable is designated for each character.

In the background image in which the color operation enable bit is set to 1, color operation is performed only on the character pattern in which the value of the color operation bit CC in the pattern name data is 1.

<Mode 2> The color operation enable is designated for each dot.

In the character pattern in which the value of the color operation bit CC in the pattern name data of the background image in which the color operation enable bit is designated 1 is 1,
Color calculation is performed only on the dots that match the dot color code specified in the special function code bit.

<Mode 3> Designate by the most significant bit of color data.

When the image data of the background image for which the color operation enable bit is designated as 1 is in the palette format, color calculation is performed only for the dots using the color data for which the most significant bit is designated as 1. When the image data is in RGB format and this mode is designated, color calculation is always performed.

H. Image display enable register Image display enable bit: Background images BG0, BG1,
Designate whether to display BG2, BG3, RBG0, RBG1. The background images BG0, BG1, BG2, BG3 are used as a normal scroll screen, and the background images RBG0, RBG1 are used as a rotary scroll screen. The normal scroll screen and the rotary scroll screen will be described later.

(B) Processing Flow Next, the flow of priority judgment and color calculation processing will be described with reference to FIG. In the figure, a sprite dot data bit detection unit 10, a sprite priority number control unit 20, a scroll dot data code determination unit 80, a scroll priority number control unit 90, and a priority determination unit 40.
The priority control unit 11 is configured by the above. Further, the sprite color calculation ratio control unit 30 and the scroll color calculation ratio control unit 12
0, color calculation ratio control unit 60, sprite color calculation enable control unit 50, scroll color calculation enable control unit 100, color calculation enable control unit 70, and color calculation unit 11
0 configures the color calculation control unit 12.

A. Priority Determination <Determination of Priority Number of Foreground Image> First, the foreground image data FGDT output from the sprite engine 17 is the sprite dot data bit detection unit 10.
Is supplied to. Sprite dot data bit detector 1
When the image data FGDT is 0, the dot color data DCL, the priority number selection bit PRNSL, and the color calculation ratio selection bit CCR are set based on the sprite type set in the control register.
Divided into SL. Then, the priority number selection bit PRNSL is supplied to the sprite priority number control unit 20, the color calculation ratio selection bit CCRSL is supplied to the sprite color calculation ratio control unit 30, and the dot color data DCL is supplied.
Is supplied to the priority determination unit 40.

In the sprite priority number control unit 20, one of the priority numbers set in the priority number register for sprite is selected based on the priority number selection bit PRNSL. Then, the selected priority number FGPN is assigned to the priority determination unit 4
0 and the sprite color calculation enable control unit 50.

<Determination of Priority Number of Background Image> On the other hand, of the background image pattern name data PN output from the background image generation unit 31, the priority bit PRI is supplied to the scroll priority number control unit 90 for color calculation. The use bit CC is supplied to the scroll color operation enable control unit 100. Also, the image data BG0DT, BG1DT, BG2DT, BG3DT output from the background image generation unit 31.
Is supplied to the priority determination unit 40 and the scroll dot data code determination unit 80. In the scroll dot data code determination unit 80, the image data BG0D
The lower 4-bit value (code value CODE) of T, BG1DT, BG2DT, and BG3DT is detected and output to the scroll priority number control unit 90 and the scroll color calculation enable control unit 100.

In the scroll priority number control unit 90, the background images BG0, BG1, BG2, BG are selected by the scroll priority number bits.
A priority number for each 3 is determined. Here, first, the least significant bit of the priority number is designated based on the mode set in the special priority mode register. That is, when the mode 0 is set, the value of the scroll priority number bit is used as it is, and when the mode 1 is set, the value of the priority bit PRI is used as the least significant bit. When the mode 2 is set, the priority bit PRI is 1 and the least significant bit of the dot that matches the dot color code designated as the special function code bit is 1
To Priority numbers BG0PN, BG1PN, BG2PN, BG3PN determined in this way
Is supplied to the priority determination unit 40.

<Priority Judgment> In the priority judgment unit 40, the FGPN of the foreground image and the priority numbers BG0PN, BG1PN, BG2P of the respective background images.
The priority is determined from N and BG3PN.
At this time, a screen composed of high priority dots is a top image, a screen composed of second highest dots is a second image, and a screen composed of third highest dots is a third image. Here, FIG. 4 shows an example of the top image, the second image, and the third image. For example, the background image BG0 shown in FIG. 9A and the background image BG shown in FIG.
1, a background image BG2 shown in (c) and a background image BG3 shown in (d), each of which has a priority of "6",
It is assumed that they are "4", "2", and "1". As a result,
The top image is as shown in (e) of the figure, the second image is as shown in (f), and the third image is as shown in (g).

The result thus determined is supplied to the color calculation ratio control unit 60 and the color calculation unit 110 as the priority PRIOR.

B. Color calculation enable <Foreground image color calculation enable> On the other hand, the sprite color number enable control unit 50 to which the foreground priority number FGPN is supplied from the sprite priority number control unit 20 performs color calculation of the foreground image and other screens. It is decided whether to do it,
The result is output as the color operation enable FGEN. At this time, the color calculation condition of the foreground image is set in the sprite color calculation condition bit of the sprite control register. When the conditions 1) to 3) are set, the priority number FGPN and
The sprite color calculation condition number bit is compared with the color calculation condition number set in the bit. If condition 4) is set, dot color data DC
Based on L, the most significant bit of the color data is read from the color RAM 23, and it is determined whether or not this value is 1. As a result of the determination as described above, when the color calculation of the foreground image is performed, the output color calculation enable FGEN is turned on.

<Background image color calculation enable> On the other hand,
Scroll color calculation enable control unit 100
Then, the code value CODE and the color calculation bit C
Based on C, it is determined whether or not color calculation is performed for each background image, and the result is the color calculation enable BG0.
It is output as EN, BG1EN, BG2EN, BG3EN.

First, the color operation enable mode is selected based on the special color operation mode bit set in the special color operation mode register. That is, when the mode 0 is set, it is determined that the color operation is performed when the value of the color operation enable bit is 1.
When mode 1 is set, the color operation enable bit is set to 1, and the color operation bit C
When the value of C is 1, it is determined to perform color calculation on the character pattern.

When mode 2 is set,
If the color operation enable bit is specified as 1, the value of the color operation bit CC of the character pattern is 1, and the dot color code specified in the special code bit matches, It is decided to perform a color operation. Furthermore, when mode 3 is set, the image data BG0DT, BG1DT, B
The most significant bit of the color data is read from the color RAM 23 based on G2DT and BG3DT, and this value is 1
Is determined. As a result of the determination as described above, for the background image for which the color calculation is performed, the color calculation enable BG0EN, BG1EN, B to be output is output.
G2EN and BG3EN are turned on.

<Color operation enable> The color operation enable FGEN of the foreground image output as described above
And background image color calculation enable BG0EN, BG1
EN, BG2EN, BG3EN are supplied to the color operation enable control unit 70. Then, it is determined to which screen the color calculation is to be performed, and the result is set as the color calculation enable EN to the color calculation unit 1.
It is output to 10.

C. Color calculation ratio <Color calculation ratio of foreground image> On the other hand, in the sprite color calculation ratio control unit 30, the color calculation ratio register for sprite is set in the sprite color calculation ratio register based on the color calculation ratio selection bit CCRSL supplied from the sprite dot data bit detection unit 10. 1 of the calculated color calculation ratios
One is selected. Then, the selected color calculation ratio FGCR is supplied to the color calculation ratio control unit 60.

<Color calculation ratio of background image> Also, the color calculation ratios BG0CR, BG1CR, BG2CR, set in the scroll color calculation ratio register for each screen by the scroll color calculation ratio control unit 120.
BG3CR is supplied to the color calculation ratio control unit 60.

<Color Calculation Ratio> The color calculation ratio control unit 60 determines the color calculation ratio. First, the color calculation ratio of the top image or the second image is selected based on the color calculation ratio mode set in the color calculation ratio control register. That is,
When the mode 0 is set, the value of the color calculation ratio of the screen which becomes the top image is selected based on the R priority PRIOR supplied from the priority determination unit 40. When the mode 1 is set, the value of the color calculation ratio of the screen which becomes the second image is selected. Color calculation ratio CR selected in this way
Are supplied to the color calculation unit 110.

D. Color operation In the color operation section 110, color operation is performed based on the priority PRIOR from the priority determination section 40, the color operation enable EN from the color operation enable control 70, and the color operation rate CR from the color operation rate control section 60.

Here, for example, as shown in FIG. 5, there are foreground image FG and background images BG0, BG1, BG2, BG3, each of which has a priority number of "8",
It is assumed that they are “6”, “4”, “2”, and “1”. A case will be described in which, when these are displayed, as shown in FIG. 6, color calculation is performed inside the character CHR of the foreground image FG so that the image of the background image BG0 can be seen through.

At this time, when displaying the inside of the character CHR, the priority is determined by the priority determination unit 40 based on the priority number, and the priority is the foreground image F.
The order is G → background image BG0 → background image BG1 → background image BG2 → background image BG3. Therefore, the top image is the foreground image F
It becomes the image of G, and the second image becomes the image of the background image BG0.

On the other hand, when the sprite color calculation condition set in the sprite control register is condition 3) and the color calculation condition number is 6, the sprite color calculation enable control unit executes the color calculation of the foreground image FG. Will be judged. The color calculation enable FGEN corresponding to the result of this determination is supplied to the color calculation enable control 70.

Further, the color calculation ratio of the foreground image FG is 2
0:12, and the color calculation ratio of the background image BG0 is 1
It is 6:16, and it is assumed that mode 0 is specified in the color operation mode bit and mode 0 is specified in the color operation ratio mode bit. As a result, the color calculation ratio control unit 60 outputs the color calculation ratio CR indicating 20:12, which is the color calculation ratio of the foreground image FG, to the color calculation unit 110.

Therefore, in the color calculation section 110, the image data FGDT and BG of the foreground image FG and the background image BG0.
If 0DT is a palette format, color RAM 23
The RGB data is read from and the values of the RGB data are added at a color operation ratio of 20:12. Also, the image data FGDT and BG0 of the foreground image FG and the background image BG0.
When DT is RGB data, the value as it is is added at the color operation ratio of 20:12. Then, the result of this addition is output to the D / A converter 23 as RGB data.

(C) Special Color Calculation Process Next, the special color calculation process will be described.

A. Blurring Computation Processing First, the blurring computing function will be described. The blurring calculation function is a function of adding the specified color data in the horizontal direction in the horizontal direction at a constant ratio, and can obtain the effect of blurring a distant background. At this time, the following information is set in the color calculation control register.

Blurred arithmetic enable bit: Designates whether to use the blurred arithmetic function.

Blurry screen number bit: Designates a screen using the blurry calculation function.

A concrete example of this blurring calculation function is shown in FIG.
Shown in. First, the background image BG0 shown in FIG.
The background image BG1 shown in (b) and the background image BG shown in (c).
2 and the priority numbers are “6”, “4”, and “2”, respectively. Also,
In (a) and (b), areas A and B are transparent, and (c) is a blurring calculation designation screen. In this case, the blurring calculation enable bit of the color calculation control register becomes "1", and the blurring screen is displayed. The background image BG2 is designated by the number bit. As a result of the priority determination unit 40 determining the priority, the top image shown in FIG. 7D and the second image shown in FIG. Here, in the color calculation unit 110, blurring calculation is performed using the image data BG2DT of the background image BG2. This blurring operation is performed as follows.

First, a designated screen (in this case, the background image BG
The color data of 2 dots before (2 dots left on the display screen) and the color data of 1 dot before (1 dot left on the display screen) of the display coordinates of the dot of 2) are held.
Then, the color data of each dot is set to 1 / RGB.
It is quadrupled and added to the value at the following ratio.

(2 dots of display coordinates: (1 dot of display coordinates: (color data on the left of display coordinates) Color data on the left) Color data) = 1: 1: 2: 2 In this way, the blur calculation is performed. In the area in which the background image BG2 is the top image or the second image, that is, in the area C in FIG. 7D and the area D in FIG. 7E, the blur calculation is performed as shown in FIG. The background image BG2 is forcibly set as the second image.
Then, the color calculation unit 110 performs color calculation on the top image shown in FIG. 7D and the second image shown in FIG. 6F to generate the image shown in FIG. In addition,
The part of the second image shown in (f) other than the above-mentioned area is the screen determined by the priority as usual.

B. Extended color arithmetic processing a. Color Calculation of Three Screens As described above, normally, color calculation is performed only on the two screens of the top image and the second image. However,
By using the result of adding the second image and the third image at a constant ratio as the data of the second image, color calculation of three screens is possible. At this time, the extended color operation enable bit is set in the color operation control register. When the extended color operation function is used, the value of this bit is "1".

For example, a case where the extended color arithmetic processing is performed inside the character CHR shown in FIG. 6 will be described. In this case, in this portion, the image of the background image BG1 is the third image. Therefore, the color calculation enable BG1EN of the background image BG1 output from the scroll color calculation enable control unit 100 is also turned on, and the color calculation enable EN output from the color calculation enable control unit 70 includes the foreground image FG and the background image BG0. And the background image BG1 is designated.

When the use of the extended color calculation function is set and the color calculation enable EN is supplied,
In the color calculation unit 110, first, the image data BG0DT of the background image BG0 and the image data BG1DT of the background image BG1 are displayed.
And are added at a fixed rate. Then, this becomes the data of the second image, and the color calculation is performed as described above with the image data FGDT of the foreground image FG which is the top image.

B. Line Color Screen In this embodiment, a line color screen used only for performing color calculation is provided. An example of using this line color screen is shown in FIG. First,
As shown in (a) of the figure, it is assumed that there is a background image BG0 displaying a mountain and a background image BG1 displaying a road heading to the back of the screen. Then, as shown in FIG. 7B, the background image BG1 is color-calculated using a line color screen LN that gradually changes from a dark color to a light color from the upper part of the screen to the lower part. As a result, as shown in FIG. 7C, the color displayed from the front to the back gradually becomes darker, and an image with a sense of distance can be generated.

When such a line color screen is used, a line color screen table is set in the VRAM 22 and data (color RA) for each line of the line color screen is set.
The address of M23) is stored in this line color screen table. The correspondence between the line color screen table and the line color screen is shown in FIG. In addition to the case of specifying the color for each line as described above, the whole screen may be specified as a single color. At this time, the data of the first line is used as the data of the entire screen.

In the register of the scroll engine 18,
The following registers are set.

Line color screen enable bit: For each screen, specifies whether or not to insert a line color screen when each becomes the top image. When inserting, the value of this bit becomes "1".

Line Color Screen Color Mode Register:
Line color Specifies the screen color mode.

<Mode 0> The entire line color screen is made monochrome.

<Mode 1> Line It is designated for each line of the color screen.

Line color screen table address bit: Designates the start address of the line color screen table on the VRAM 22.

When mode 0 is designated, VRAM2
The data of the address designated by the line color screen table address bit is read from 2 and becomes the color of the line color screen. When the mode 1 is designated, the data of the address designated by the line color screen table address bit is read line by line and becomes the color of each line of the line color screen.

C. Line color screen and rotary scroll <Regarding scroll function> The image processing apparatus according to the present embodiment has a scroll function of moving or rotating a background image in the left-right and up-down directions. The background image displayed by this scroll function is VRAM in the actual calculation.
It is a virtual still image stored in 22, and a calculation for converting information about this image, that is, a process for moving the background image is not performed. The graphical image of the actual calculation is such that the frame of the screen screen and the viewpoint of the player move freely in the VRAM 22 over the entire background image. In addition,
Strictly speaking, the screen screen is a virtual screen that is set for each circuit that performs movement conversion and rotation conversion, but from the viewpoint of the screen on which an image is displayed, it is considered to be the monitor screen of the display device. You may

<Rotary Scroll Screen> Types of scroll screens include a so-called normal scroll screen that moves horizontally and vertically and a rotary scroll screen that rotates. The rotation scroll screen here means coordinate axes (X,
This is a scroll screen that performs rotation about (Y, Z axes) as a rotation axis and rotation about a screen axis perpendicular to the monitor screen as a rotation axis.

Regarding the relationship between the scroll screen, the screen screen and the viewpoint when displaying the rotary scroll screen,
A description will be given with reference to the drawings. When the state shown in FIG. 10 is the initial state, when FIG. 11 is “X-axis rotation” in which the screen screen is rotated about the X axis with respect to the scroll screen, FIG.
In the case of “Y-axis rotation” rotated about the axis, FIG.
Is the case of "Z axis rotation" in which the screen screen is rotated around the Z axis with respect to the scroll screen.

<Movement Rotation Conversion Type> When the screen screen moves from the state shown in FIG. 10 as shown in FIGS. 11 to 13, the images on the screen screen are shown in FIGS.
The display is as shown in. 14 corresponds to FIG. 10, FIG. 15 corresponds to FIG. 11, FIG. 16 corresponds to FIG. 12, and FIG. 17 corresponds to FIG. Note that the lower part of FIGS. 14 to 17 is the rotation matrix parameter in the state of each drawing.

In the present embodiment, the screen screen subjected to the movement rotation conversion (that is, the display screen of the rotary scroll screen) is subjected to the rotation conversion of the viewpoint and the screen screen with the center point as a reference, and the viewpoint after the conversion is converted to the converted screen. The line of sight through the screen is a collection of points that intersect the fixed scroll map. Here, the viewpoint (P
(x, Py, Pz) is rotated about the center point (Cx, Cy, Cz), and further translated to move the viewpoint after conversion to (X
The movement-rotation conversion equation, which is the movement rotation of (p, Yp, Zp), is given by the following equation.

[0146]

[Equation 1] However, Mx, My, and Mz are parallel movement amounts with respect to the X, Y, and Z axes, and A to I are rotation matrix parameters.

Further, the point (Sx, Sy, Sz) on the screen screen before coordinate conversion is moved and rotated in the same manner as described above, and the point on the screen screen after coordinate conversion is changed to (Xs, Y).
s, Zs) is given by the following equation.

[0148]

[Equation 2] Furthermore, the point on the scroll screen to be displayed passes through the point on the screen screen after conversion from the viewpoint after conversion (X, Y,
The viewpoint leading to Z) is expressed by the following equation.

[0149]

[Equation 3] Since the scroll screen to be displayed here, that is, the background image stored in the VRAM 22 is a plane of Z = 0, the X and Y coordinates of the scroll screen to be displayed are expressed by the following equations.

X = k (Xs−Xp) + Xp Y = k (Ys−Yp) + Yp (4) However, k = −Zp / (Zs−Zp) The above coefficient k is the equation (1), (2). From the formula, it is expressed as follows.

[0151]

[Equation 4] In the equation (5), the viewpoint (Px, Py, P
z), the center point before conversion (Cx, Cy, Cz), the amount of parallel movement (Mx, My, Mz) and the rotation matrix parameters A to I are fixed values within one frame, so the coefficient k
Is the point (Sx, Sy, Sz) on the screen screen before conversion
Changes according to the value of.

As described above, the coefficient k used for the movement / rotation conversion is stored in the VRAM as the coefficient data by the CPU 15.
22 is written in the coefficient data table. This coefficient data is calculated by the CPU 15,
One screen is written for each pixel in the vertical and horizontal blanking periods. Then, the coefficient data is read according to the rotation of the screen. At this time, the read address TA at the display coordinates (H, V) is obtained by the following formula. Note that TAst is the start address of the coefficient data table, ΔTAst is the vertical address increment, ΔTA is the horizontal address increment, H is the H count value, and V is the V count value.

TA = TAst + ΔTAst × V + ΔTA × H (6) <Line color screen and rotary scroll screen> When performing color calculation on the rotary scroll screen and line color screen described above, a normal line color screen is displayed. There is a case where the color data is read out and the calculation is performed, and a case where the line color screen is rotated in accordance with the rotation of the rotary scroll screen. At this time, the following information is set as the coefficient table control register.

Coefficient line color enable bit: Designates whether to use the line color screen data in the coefficient data.

Coefficient table enable bit: Designates whether or not to use the coefficient data table.

In this embodiment, when the line color screen is rotated in accordance with the rotation of the rotary scroll screen as described above, part of the coefficient data and the color data of the line color screen (line color screen data) is used. And 1
The phrase is stored in the VRAM 22 as a set of data. Then, if necessary, a part of the line color screen data in the coefficient data is added to a part of the line color screen data read from the line color screen table. For example, as shown in FIG. 18A, 4 bits of the line color screen data of 11 bits are combined with 7 bits of the coefficient data of 16 bits as shown in FIG. , And synthetic data as shown in FIG.

FIG. 19 shows the structure of the line color screen, the rotary scroll screen, and the scroll engine 18 for color calculation. In the figure, the background image generation unit 31
Is the normal scroll image data control unit 20.
0, rotary scroll image data control unit 210,
Rotating scroll coefficient table address control unit 220, normal scroll line color screen table address control unit 230, coefficient data buffer 240a, rotating scroll line color screen data buffer 240b, normal scroll line color screen data buffer 250, and switch 260. Composed of.

First, when the normal scroll screen is used as the background image, the background images BG0, BG1, BG2,
Alternatively, the image display enable bit for BG3 becomes "1". Then, the normal scroll image data control unit 200 uses the VRAM 22 as described above.
The pattern name data and the pattern data are read from the image data BG0DT, BG1DT, B for one pixel.
Outputs G2DT and BG3DT. These data are
It is supplied to the priority control unit 11 of the display control unit 32. Then, as described above, the normal color calculation processing is performed.

When the normal scroll screen is used and the line color screen is used, the normal scroll line color screen table address control unit 230 reads the line color screen data of the line color screen table in the VRAM 22. The address is set. Then, the line color screen data is read based on the read address and stored in the normal scroll line color screen data buffer 250. At this time, the switch 260 is switched to the normal scroll line color screen data buffer 250 side, and the line color screen data is supplied to the color calculation control unit 12.

On the other hand, when the rotary scroll screen is used as the background image, the image display enable bit for the background image RBG0 or RBG1 becomes "1". Then, the rotary scroll coefficient table address control unit 220 obtains the read address TA of the coefficient data table from the above equation (6). The VRAM 22 is accessed by the read address TA, and the read coefficient data is stored in the coefficient data buffer 240a. Then, this coefficient data is supplied to the rotary scroll image data control unit 210. In the rotary scroll image data control unit 210, X, Y are calculated according to the above equations (1) to (4) based on the coefficient data.
The coordinates are determined and the VRAM 22 is accessed accordingly. Then, the pattern name data and the pattern data are read, and the image data RBG0DT or R
RBG1DT is output.

When a rotary scroll screen is used and a normal line color screen is used, the rotary scroll coefficient table address control unit 22 is used.
By setting 0, VR as in the case of normal scroll screen
The line color screen data in the AM 22 is read out, and the line color screen data buffer 240 for rotary scrolling is read.
It is supplied to the color calculation control unit 12 via b. On the other hand, when the line color screen is also rotated, "1" is set to the coefficient line color enable bit of the coefficient table control register. As a result, the coefficient table address control unit for rotary scroll 22
0 obtains the read address TA of the coefficient data table and sets the read address of the line color screen table. Then, the coefficient data is stored in the coefficient data buffer 240a, and the line color screen data combined as described above is stored in the rotary scroll line color screen data buffer 240b. Then, this line color screen data is supplied to the switch 260. At this time, since the switch 260 is switched to the rotary scroll line color screen data buffer 240b side, the line color screen data is supplied to the color calculation control unit 12.

D. Color Calculation of Four Screens with Line Color Screen Inserted Next, the extended color calculation process of four screens by inserting the line color screen will be described. FIG. 20 shows an example of the color calculation processing of the four screens. In the figure, (a) is a background image BG0, (b) is a background image BG1, and (c) is a background image BG.
2, (d) shows the background image BG3, and the respective priority numbers are “6”, “4”, “2”, and “1”.
And The line color screen enable bit for the background images BG0 and BG2 is "1",
The line color screen LN shown in FIG. 9D is inserted as the second image of the portion that is the top image.

In the priority determining section 40 shown in FIG. 3, the priorities are determined in the order of background image BG0 → background image BG1 → background image BG2 → background image BG3. Then, the color calculation unit 110 is provided with the priority PR.
The line color screen data LNDT output from the switch 260 shown in FIG. 20 is supplied together with the IOR. In the color calculation unit 110, as shown in FIGS. 20F and 20G, the background image BG0 is the top image, that is, the portion of the character CH0, and the background image BG2 is the top image, that is, the character CH2. The line color screen data LNDT is inserted as a second image in a portion that does not overlap the characters CHR0 and CHR1.
And in the part where the line color screen is inserted,
The second image before being inserted becomes a third image as shown in FIG. 20 (h), and the third image becomes a force image as shown in FIG. 20 (i).

For example, when performing color calculation in the area AR0 where the character CHR0 and the character CHR1 overlap, it is assumed that the color calculation enable bit of the area AR0 of the background image BG1 is "0". In that case, the area AR
At 0, the third image and the line color screen are color-calculated at a constant ratio, and the result becomes the data of the second image. If the color calculation enable bit in the area AR0 of the background image BG1 is "1", first, the third image and the force image are color-calculated at a constant ratio, and the result and the line color screen are color-calculated. It Then, this result becomes the data of the second image.

As described above, when the color operation enable bit of the screen which is the third image is "0", the extended color operation of three screens is performed, and when it is "1", the extended color operation of four screens is performed. .

(3) Effects of the Embodiment As described above, according to this embodiment, the priority number set for each background image can be changed in character units or dot units. Further, the color calculation enable set for each background image can be changed in character units or dot units.

Further, since one of a plurality of color calculation ratios is set for each screen, it is possible to gradually change the color calculation ratio according to the display on the screen. Further, since the line color screen can be used for color calculation, the color data and color calculation of the line color screen can be performed for each line. Therefore, for example, it is possible to perform a display in which the designated screen color is gradually changed.

Furthermore, it is also possible to perform extended color calculation for three screens and extended color calculation for four screens using a line color screen. Further, when the background image is used as a rotary scroll screen, a part of the line color screen data and the coefficient data are stored as a set in the VRAM and color calculation is performed on the background image and the line color screen. , Line color screen data is read and a part of the line color screen is added to it. Therefore, it is not necessary to separately provide a circuit for calculating the address of the line color screen table when using the rotary scroll screen.

(4) Other Embodiments The present invention is not limited to the above embodiments,
It can be widely used in image display devices of computers other than video game machines, that is, personal computers and the like.

[0170]

As described above, according to the present invention, the following effects can be obtained.

(1) The screen priority can be set in cell units and dot units.

(2) On the same screen, it is possible to set whether or not to perform color calculation in cell units and dot units.

(3) The color calculation ratio is set to 1 as in the conventional case.
Since you select from multiple types instead of types and set,
When displayed, it is possible to change the amount of see-through of the back image with respect to the front image.

(4) By performing color calculation using the line color screen in which the color is set for each line,
It is possible to display such that the color of the designated screen is gradually changed. In addition, 1 of the line color screen
By using only the color of the line eye, color calculation can be performed on the designated screen and the monochromatic line color screen.

(5) When the moving / rotating conversion process is performed on the screen and color calculation is performed on this screen and the line color screen, the coefficient data and the line color screen data used for the calculation of the moving / rotating conversion process are calculated. Since a set of coefficient data is stored in the image memory, it is not necessary to provide a means for reading the line color screen data separately from a means for setting the read address of the coefficient data. Therefore, the above calculation can be performed without increasing the circuit scale.

As described above, a wide variety of color calculations can be performed, and a more versatile screen display can be realized with a simple structure.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of an image processing apparatus according to an embodiment of the present invention.

FIG. 2 is image data FG of the foreground image FG in the embodiment.
It is a figure which shows the structure of DT.

FIG. 3 is a block diagram illustrating priority determination and color calculation processing in the embodiment.

FIG. 4 is a diagram for explaining determination of priority in the embodiment.

5A, 5B, 5C, 5D, 5E, 5D, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5E, 5e, 5e, 5e, 5e, 5e, 5e, 5e, 5e, 5e, 6e, 6e, 6e, 6e, 6e, 6e, 6e, 6e, 6e, 6e, 6e, 6e, 6e, 7e, 7e, 7e, 7e, 7e, and 6e, and 7e, background image BG0, BG0, BG1 and BG2 are shown. B
It is a figure which shows G3.

FIG. 6 is a diagram showing a screen displayed based on the screen shown in FIG.

FIG. 7 is a diagram showing an example of a blurring calculation function in the embodiment.

FIG. 8 is a diagram illustrating color calculation using a line color screen in the example.

FIG. 9 is a diagram showing a correspondence between a line color screen table and a line color screen in the embodiment.

FIG. 10 is a perspective view showing a scroll screen, a screen screen, and a line of sight.

11 is a perspective view of the screen screen of FIG. 4 rotated on the X-axis with respect to the scroll screen.

FIG. 12 is a perspective view of the screen screen of FIG. 4 rotated in the Y-axis with respect to the scroll screen.

13 is a perspective view of the screen screen of FIG. 4 rotated in the Z-axis with respect to the scroll screen.

14 is a front view showing a screen screen corresponding to FIG. 4. FIG.

15 is a front view showing a screen screen corresponding to FIG. 5. FIG.

16 is a front view showing a screen screen corresponding to FIG.

17 is a front view showing a screen screen corresponding to FIG. 7. FIG.

FIG. 18 is a diagram illustrating composition of line color screen data and coefficient data.

FIG. 19 is a block diagram showing a configuration of a scroll engine 18 relating to color calculation of a line color screen and a rotary scroll screen in this embodiment.

FIG. 20 is a diagram illustrating an expanded color calculation of four screens according to this embodiment.

FIG. 21 is a diagram illustrating a priority function in a conventional image processing apparatus.

FIG. 22 is a diagram illustrating a color calculation function in a conventional image processing apparatus.

[Explanation of symbols]

10 ... Sprite dot data bit detection unit 18 ... Scroll engine 20 ... Sprite priority number control unit 22 ... VRAM 23 ... Color RAM 30 ... Sprite color calculation ratio control unit 31 ... Background image generation unit 32 ... Display control unit 40 ... Priority determination unit 50 ... Sprite color calculation enable control unit 60 ... Color calculation ratio control unit 70 ... Color calculation enable control unit 80 ... Scroll dot data code determination unit 90 ... Scroll priority number control unit 100 ... Scroll color calculation enable control unit 110 ... Color calculation unit 120 ... Scroll color calculation control unit 210 ... Rotating scroll image data control unit 220 ... Rotating scroll Table address control unit 230 ... normal scroll line color screen table address control unit 240a ... coefficient data buffer 240b ... rotating scroll line color screen data buffer 250 ... line for normal scrolling color screen data buffer 260 ... switch

Claims (16)

[Claims] 1. An image processing method for reading image data of a plurality of screens from an image memory and generating a video signal based on those priorities, wherein a "screen" is a unit for setting the priorities of the plurality of screens. An image processing method, characterized in that any one of "cells" forming the screen and "dots" forming the cell is selected. 2. The image data of a plurality of screens are read from the image memory, their priorities are compared with each other, color calculation is performed in a portion having the highest priority of the designated screen, and a video signal is generated based on the result. In the image processing method to generate, as a unit for setting whether to perform the color calculation,
Select any one of "screen", "cell" that composes the screen, and "dot" that composes the cell, and set whether to perform color calculation according to the selected unit. An image processing method comprising: 3. The image data of a plurality of screens are read from the image memory, their priorities are compared with each other, color calculation is performed in a portion of the designated screen having the highest priority, and a video signal is generated based on the result. In the image processing method to be generated, a plurality of color calculation ratios, which are calculation ratios with other screens when performing the color calculation, are set, and one of the color calculation ratios is selected for each of the plurality of screens. , In the portion with the highest priority of the designated screen, when performing color calculation with the image data of the screen and the image data of the screen with the second highest priority in that portion, regarding the designated screen Set for the screen with the second highest priority and the color calculation ratio that has been set. An image processing method, characterized in that one of the selected color calculation ratios is selected and color calculation is performed based on the selected color calculation ratio. 4. The image data of a plurality of screens is read from the image memory, their priorities are compared with each other, and color calculation is performed in a portion of the designated screens having the highest priority compared to other screens.
In an image processing method for generating a video signal based on the result, in a portion where the designated screen has the highest priority, color calculation is performed using image data of a screen having the second highest priority and image data of the third highest priority. And the result is used as image data of the screen having the second highest priority, and color calculation is performed with the image data of the specified screen. 5. The image data of a plurality of screens is read from the image memory, their priorities are compared with each other, and color calculation is performed in a portion of the designated screen having the highest priority as compared with other screens.
In an image processing method for generating a video signal based on the result, in the image memory, color data for each line forming a line color screen for color calculation is stored as a line color screen table, and the specified Image processing, wherein color data of the line color screen is used as image data of a screen having the second highest priority in a portion having the highest screen priority, and color calculation is performed with the image data of the designated screen. Method. 6. An image processing apparatus for reading out image data for a plurality of screens from an image memory and generating a video signal based on those priorities, wherein a priority setting means for setting the priority for each dot forming the screen. An image processing apparatus comprising: 7. An image processing apparatus for reading out image data of a plurality of screens from an image memory and generating a video signal based on those priorities, wherein a priority number setting means for setting a priority number representing a priority for each screen. And, as a unit for setting the priority number,
Priority setting selection means for selecting any one of "screen", "cell" forming the screen, and "dot" forming the cell, and "dot" as the unit by the priority setting selection means Is selected, the priority number is changed in dot units, and when "cell" is selected as the unit, the priority number changing unit changes the priority number in cell units. Processing equipment. 8. A priority bit detecting means for detecting a priority bit set in the cell unit from the image data, wherein the priority changing means is "cell" as the unit by the priority setting selecting means. When the priority bit is selected, the priority bit is set as the least significant bit of the priority number of the dots forming the cell, and when "dot" is selected, the dots forming the cell in which the priority bit is turned on. 8. The image processing apparatus according to claim 7, wherein the least significant bit of the priority number of a dot whose image data matches a predetermined value is turned on. 9. The image data of a plurality of screens are read from the image memory, their priorities are compared, and color calculation is performed in a portion of the designated screens having the highest priority compared to other screens.
In an image processing device that generates a video signal based on the result, as a unit for setting whether to perform the color calculation,
A color calculation setting selection unit that selects any one of a “screen”, a “cell” that forms the screen, and a “dot” that forms the cell; When "Screen" is selected, whether to perform the color calculation is set for each screen, when "Cell" is selected, it is set for each cell, and when "Dot" is selected, it is set for each dot. An image processing apparatus comprising: color calculation enable setting means. 10. A color operation bit detection unit for detecting a color operation bit set in the cell unit from the image data, wherein the color operation enable setting unit is provided for each of the plurality of screens. Color calculation setting means for setting whether or not color calculation is performed, and when "cell" is selected as the unit by the color calculation setting selection means, the color calculation setting means is set to perform color calculation. On the screen, when the color operation is set to be performed only for the cells for which the color operation bit is turned on and "dot" is selected as the unit, the color operation setting means is set to perform the color operation. On the screen, the image data of the dots that make up the cell with the color operation bit turned on matches the specified value. 10. The image processing apparatus according to claim 9, further comprising a color calculation enable changing unit that sets color calculation only for the selected dots. 11. The image data of a plurality of screens is read from the image memory, their priorities are compared with each other, and color calculation is performed in a portion of the designated screen having the highest priority as compared with other screens. In an image processing apparatus that generates a video signal based on the result, selects one of a plurality of types of color calculation ratios, which is a calculation ratio with another screen when performing the color calculation. An image processing apparatus comprising color calculation ratio setting means. 12. The image data of a plurality of screens is read from the image memory, their priorities are compared with each other, and color calculation is performed in a portion of the designated screens having the highest priority as compared with other screens. In an image processing device that generates a video signal based on the result, a priority determination unit that determines the priority of each screen in the portion where the priority of the specified screen is the highest, and for each of the plurality of screens, another screen And a color calculation ratio setting means for selecting any one of a plurality of types of color calculation ratios set, and the specified screen in the portion with the highest priority of the specified screen. The color calculation ratio of
Based on the color calculation ratio selection means for selecting one of the color calculation ratio of the screen for which the priority is judged to be the second highest in that portion, and the color calculation ratio selected by the color calculation ratio selection means. The image processing apparatus further comprises a color calculation unit that performs color calculation on the image data of the designated screen and the image data of the screen determined to have the second highest priority. 13. The image data of a plurality of screens is read from the image memory, their priorities are compared with each other, and color calculation is performed in a portion of the designated screens having the highest priority as compared with other screens. In an image processing device that generates a video signal based on the result, a priority determining unit that determines the priority of each screen in the portion where the designated screen has the highest priority, and the portion where the designated screen has the highest priority In that part, color calculation is performed on the image data of the screen determined to have the second highest priority and the image data of the screen determined to be the third highest in that portion,
An image processing apparatus comprising: a color calculation unit that performs a color calculation on the result and the image data of the designated screen. 14. The image data of a plurality of screens is read from the image memory, their priorities are compared with each other, and color calculation is performed in a portion of the designated screens having the highest priority as compared with other screens. In the image processing device for generating a video signal based on the result, in the image memory, control means for storing color data for each line forming a line color screen for color calculation as a line color screen table, Addressing means for designating an address of the color data read from the line color screen table, loading means for sequentially loading the color data at the addresses designated by the addressing means, and a portion of the designated screen having the highest priority. In the above, The image processing apparatus in which the color data priority are incorporated is the second highest screen image data, characterized by comprising a color arithmetic means for performing image data and the color arithmetic of the specified screen Te. 15. The image processing apparatus according to claim 14, wherein the color calculation means performs the color calculation using only the color data stored at the head of the line color screen table. 16. A moving / rotating converting unit for performing an operation of a moving / rotating converting process on image data of any one of the plurality of screens, wherein the control unit stores the moving / rotating converting process in the image memory. Represents the coefficient used for the calculation of, the coefficient data set for each dot of the screen and the line color screen data are combined and stored as combined data, An operation for the movement rotation conversion process is performed using coefficient data, and the color operation means performs color operation between the designated screen and the line color screen using color data of the composite data. 16. The image processing apparatus according to claim 14, which is performed.