JPH04314097A - Image/graphic display system - Google Patents

Abstract

PURPOSE:To divide the LUT of a display memory and to superpose and display plural images and graphics. CONSTITUTION:An LUT forming part 101 divides the LUT 104 in accordance with the number of superposed images/graphics and sets up a value. An image display part 102 inputs the T, G and B values of image data, executes gradation correction and transfers the corrected contents to a display memory 105. A graphic display part 103 inputs the color index of graphic data, converts the input data into R, G and B data and transfers the converted data to the display memory 105. Thus plural images/graphic can be independently displayed by means of only one display memory 105.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image/graphic display system, and more particularly to a processing system for displaying a plurality of color images, graphs, menus, etc. in an overlapping manner.

0002

[Prior Art] Conventional image/figure display systems use a fixed display memory of 24 planes for displaying color images and 1 to 8 planes for displaying figure data such as graphs and menus, as shown in Figure 6. Was.

0003

[Problems to be Solved by the Invention] This conventional image display method requires a large amount of display memory when displaying a plurality of image data and graphic data in a superimposed manner;
In the case of a configuration including only a four-plane image display memory, there is a problem in that a plurality of image data and graphic data cannot be displayed.

0004

[Means for Solving the Problems] The image/figure display method of the present invention provides a method for displaying a plurality of color image data and figure data using one display memory. A lookup table creation section that divides a lookup table corresponding to display memory according to the number of required colors and sets parameter data, an image display section that displays image data, and a figure display section that displays figure data. Be prepared.

Further, in the image/figure display system of the present invention, the image display section inputs the R, G, and B values of the image data, performs gradation correction, and transfers them to the display memory, and the figure display section inputs the R, G, and B values of the image data, and transfers them to the display memory. A color index is input, converted into R, G, and B values, and transferred to a display memory, and a plurality of images and figures are superimposed and displayed in accordance with the number of divisions of the lookup table.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 is an explanatory diagram showing one embodiment of the present invention. Here, a case of a display memory consisting of 8 planes each of R, G, and B and a total of 24 planes will be described.

[0008] LUT (lookup table, hereinafter referred to as LU)
It's called T. ) The creation unit 101 creates an LUT 104 by inputting the number of overlapping images (and the number of R, G, and B gradations) and the number of overlapping figures (and the corresponding data of each color index R, G, and B value). do.

The image display unit 102 receives image data consisting of R, G, and B, performs gradation correction to match the number of gradations set in the LUT 104, and transfers the data to the display memory 105.

The graphic display unit 103 inputs graphic data consisting of color indices, converts it into index R, G, B data so as to match the LUT 104, and transfers it to the display memory 105.

FIG. 2 is an explanatory diagram of the LUT creation section 101. Here, the number of overlapping images is n, the required number of gradations for each is h1, h2,...hn, and the number of overlapping figures is m.
, the required number of colors (number of indexes) for each is k1, k2,
...km.

[0012] R, G, B on display memory in LUT 104
Using the value as an index, the output value for each input (
This is a table that stores display brightness), and in this embodiment, it has 256 entries (0 to 255) for each of R, G, and B.

[0013] The LUT creation unit 101 sequentially creates k1, k2, ...km, h1, ...hn of the LUT 104 from the lowest index.
Divide into parts. At this time, the total number of gradations and indexes is set to 256 or less.

Regarding the graphic LUT, there is a correspondence table 1 between indexes and R, G, and B prepared in advance by the user.
The contents of 01a are set to the R, G, and B components of the LUT 104.

Regarding the image LUT, table values are set as follows. i-th division part (hi gradation part)
For 256 gradations from 0 to 255 to h from 0 to hi-1
0,255×1/(h
i-1), 255×2/(hi-1), ..., 255.

FIG. 3 shows LUT1 created as described above.
An example of 04 is shown. In this example, the LUT is divided into three parts: one image (244 gradations each for R, G, and B) and two figures (8 colors and 4 colors).

FIG. 4 is an explanatory diagram of the image display section 102. The image display unit 102 transfers the pixel value (R, G, B) calculated according to the following formula to the display memory 105 for each pixel value (r, g, b) of the image data 102a.

R=r×(hi-1)/255+KG=g
×(hi-1)/255+K B=b×(hi-1)/255+K Here, suppose that the image is displayed in the i-th division,

[0019]

[0020]

FIG. 5 is an explanatory diagram of the graphic display section 103. When displaying the graphic data 103a in the i-th division, the color index C of the graphic is set to R, G, B according to the following formula.
is converted into the index (r, g, b) of the display memory 10.
Transfer 5.

[0022]

When the image data and graphic data converted and transferred to the display memory in this manner are displayed through the LUT, they are displayed in the same color as the original image and graphic data.

[0024] Furthermore, if you want to change the color or adjust the brightness of one image or figure after displaying a plurality of images or figures using the following method, use the LUT division section corresponding to that image or figure. By changing the contents of the image, you can change the color or adjust the brightness without affecting other images or figures at all.

[0025]

[Effects of the Invention] As explained above, the present invention is capable of displaying many images and figures with a small display memory capacity by dividing the LUT and storing a plurality of images and figures in one display memory. have an effect.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an LUT creation section.

FIG. 3 is an explanatory diagram showing an example of a LUT.

FIG. 4 is an explanatory diagram of an image display section.

FIG. 5 is an explanatory diagram of a graphic display section.

FIG. 6 is an explanatory diagram of a conventional image/graphic display method.

[Explanation of symbols]

101 LUT creation department 102 Image display section 103 Graphic display section 104 LUT 105 Display memory

Claims (2)

[Claims] Claim 1: When displaying a plurality of color image data and graphic data using one display memory,
A look-up table creation section that divides a look-up table corresponding to the display memory according to the number of image data and figure data and the number of required colors, and sets parameter data; an image display section that displays the image data; An image/graphic display method comprising: a graphic display section for displaying data. 2. In the image/figure display method according to claim 1, the image display section inputs the R, G, and B values of the image data, performs gradation correction, and transfers them to the display memory, and the figure display section inputs the R, G, and B values of the image data, and transfers them to the display memory. It is characterized by inputting the color index of the data, converting it into R, G, and B values and transferring them to the display memory, and displaying a plurality of images and figures in a superimposed manner corresponding to the number of divisions of the lookup table. Image/graphic display method.