JPS63673A - Image processing system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is particularly applicable to a system that performs drawing processing using a bit map method using a CRT display or the like.
The present invention relates to an image processing system suitable for moving and enlarging characters, images, etc.

[Conventional technology]

There is a limit to the number of bits that can be displayed on a CRT display due to the surface area of the screen, and when all image data such as complex figures is displayed on the screen, it is difficult to obtain enough bit precision to display the details. Therefore, it is common to have a two-dimensional pattern memory that is larger than the area of the screen surface, and after drawing the image data, switch the pattern memory area to be displayed and display the necessary parts one by one. be.

However, this requires a large capacity pattern memory, requires a program to perform drawing processing again for a range that exceeds the physical address space, complicates control, and reduces display speed.

An example of a related system of this type is JP-A-60-231235.

[Problems to be solved by the invention] As mentioned above, the conventional technology requires a large capacity pattern memory when processing image data such as complex figures, and also cannot move image data. There is a problem that the address space is only the physical address space of the pattern memory where the address space is implemented, and in the case of image data outside the range of this address space, a program for redrawing processing is required, which takes processing time.

An object of the present invention is to provide image processing that does not depend on the two-dimensional coordinate system of a finite pattern memory by setting up a virtual pattern memory.

[Means for solving problems]

The above purpose is to draw all the image data such as one figure to the virtual pattern memory, divide this virtual pattern memory into pages which are multiple two-dimensional areas, and
The display area of the RT display is associated with each page, and when the top, bottom, left, right, and diagonal display directions are specified on the virtual pattern memory, the pattern of the destination area is
The virtual memory pattern image for one page is transferred between the auxiliary storage device that temporarily stores the image data drawn in memory and the implemented pattern memory.
This is achieved by converting data into addresses and sequentially switching display pages.

[Effect]

The means for switching the display to another adjacent page on the virtual pattern memory is such that when the display area on the actual pattern memory is moved in the same direction as the direction in which the display area is moved on the virtual pattern memory, the pattern If the image data currently drawn in the memory area is the same as the image data of the page in the virtual pattern memory, the display area is simply moved; if the image data is from a different page, If the same image data is not already stored in the auxiliary storage device, it is saved, the image data to be drawn in the saved area is transferred from the virtual pattern memory or the auxiliary storage device, and the page switching of the display area is performed. conduct.

If the pattern memory area after movement does not exist in the physical address space, a non-display area on the opposite side of the movement direction is allocated as a drawing page, and the image data to be drawn in this area is transferred to the virtual pattern.・Transfers data from memory or auxiliary storage and performs an operation of switching pages in the display area.

This makes it possible to avoid consumption of a large amount of image memory due to enlargement and movement of figures, etc., and furthermore, it is possible to process images using a common algorithm of virtual pattern memory paging.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a block diagram of an image processing system incorporating a virtual pattern memory. Image data expressed by a two-dimensional dot pattern such as two figures, one character, and one image created by the image generation unit 1 is logically addressed. The address is translated into physical address space 7 through space 2.

The page control unit 3 divides the logical address space into a plurality of pages and converts it into the physical address space in page units.6 The display control unit 4 controls the display of arbitrary areas in the physical address space, and the drawing control unit 5 It performs processing to draw or extract image data in an arbitrary area of the physical address space between it and the auxiliary storage device 6.

FIG. 2 is a configuration diagram of the embodiment. Which page to display in the area on the virtual pattern memory, which is the logical address space, is determined by the amount of movement of the pointing device 8 such as a mouse or tablet, and the page converter 9
Pass this information to.

The CRT controller 10 performs drawing processing on the pattern memory 14 and display control processing for arbitrary areas on the pattern memory.
Image data for one page of memory is transferred to and from an auxiliary storage device 13 via a transfer buffer 12.

Here, one page is one quarter of the area of the pattern memory, the same size as the 15 display areas, and the image of this area.
Data is displayed in one-to-one correspondence with the CRT display 16.

Next, an example of image processing will be shown with reference to FIGS. 3 and 5.

FIG. 3A shows how the virtual pattern memory is divided into pages 1 to 9, of which pages 5, 6, and 8.9 are drawn in the pattern memory. 3rd m (B
) shows how the initial display area is set to page 5 and thereafter the display area is moved from page 2 to page 1 to page 5 to page 9. The image processing operation at this time is shown in FIG. In this figure, A to A within each page represent the image data of that page.

First, page 5゜6.8 on the virtual pattern memory 17.
9 image data E to pattern memory 18
, and place other image data in auxiliary storage. Next, as shown in FIG. 4(B), the initial display area is set to page 5, and the display area is switched to page 2 by moving the pointing device in the X direction. Here, since the area in the X direction of page 5 is located on a physical address where the pattern memory 18 does not exist, page 8 on the opposite side to the movement direction is secured as a drawing area for image data B. Next, image data H of page 8 that is not being displayed is saved to the auxiliary storage device 19, and image data B is drawn on page 8.

The display area is switched from page 5 to page 8 (FIG. 4(C)). Further, the pointing device is moved in the Y direction and the image data A of page 1 is processed in the same manner. The result is shown in FIG. 4(D). The display area at this time is page 9
is moving to. Next, when the pointing device is moved to display page 5, since the image data E already exists on the pattern memory 18, only the display area is switched (FIG. 4(E)). When displaying page 9, the image data exists in the auxiliary storage device 19, so after saving the image data of page 9, it is transferred to the pattern memory and the 5 display areas are switched (Fig. 4 (F)). Thereafter, image processing in the virtual pattern memory is performed by similarly determining the page to be drawn based on the direction of movement of the display area and processing the image data saved in the auxiliary storage device page by page.

FIG. 5 is a flow chart diagram showing the flow of processing in the embodiment. The direction of movement of the display area is determined by the pointing device 8 (block 21), and it is determined whether the display area after movement exists in the physical address space on the pattern memory (block 22). If the image data drawn on that page has the same value as the image data of the page in the virtual pattern memory 17 (block 24), the display area is switched (block 30) and the process ends. (Block 23) secures a page on the pattern memory on the opposite side to the moving direction of one display area. Check whether the image data of this page has already been saved to the auxiliary storage device (block 2
5) If the image data for one page is not stored in the auxiliary storage device (block 26), in (block 27), the image data to be displayed on the page after the move is saved in the auxiliary storage device. It is checked whether the page already exists, and if it exists, it is transferred from the auxiliary storage device by the DMA controller (block 28), and if not, the image data of the corresponding page on the virtual pattern memory is drawn. (Block 29). Finally, the new page display area after the movement is switched (block 30).

Finish the process.

As described above, according to this embodiment, it is only necessary to draw only the logical address space of the virtual pattern memory, regardless of the size of the physical address space of the implemented pattern memory. Processing such as virtual pattern
Image conversion processing is performed in memory, address conversion to the physical address space can be performed using a common algorithm, and a large capacity pattern memory is not required.

〔Effect of the invention〕

According to the present invention, a logical address space that does not depend on the physical address of the pattern memory implemented in the address space for drawing, that is, a virtual pattern memory, is introduced, and image data on the pattern memory is stored in page units. By performing one-draw display, there is no need for a large capacity pattern memory, the displayable area is not limited, and especially image processing involving movement and enlargement can be realized using a common algorithm.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a system configuration diagram, Fig. 3 is a diagram showing paging in image processing, Fig. 4 is a diagram of operations by paging, and Fig. 5 is a flow of processing. FIG. 1... Image generation part, 2... Logical address space. 3... Page control unit, 4... Display control unit, 5...
Drawing control unit, 6... Auxiliary storage device, 7... Physical address space.

Claims (1)

[Claims] 1. An image processing system that stores image data of a dot pattern to be drawn in a two-dimensional address space on a pattern memory, and displays image data of a specific area by dividing this two-dimensional address space into several areas. , a virtual pattern memory corresponding to a two-dimensional logical address space in which a two-dimensional coordinate address space for drawing a dot image does not depend on the size of the physical address space of the pattern memory, and a virtual pattern memory in which a dot image is drawn in the virtual pattern memory. An auxiliary storage device for storing a specific area, and a virtual pattern memory that determines the area of pattern memory that can be drawn when switching the display to image data of another specific area based on the relationship between before and after the display switching occurs. The image data being drawn in the area is determined by the direction (up, down, left, right, diagonal), and after the display is switched, the image data being drawn in the area is changed to a virtual pattern.
The method includes means for selecting a method for drawing image data to the specific area according to conditions such as whether the image data is equivalent to the image data on the memory or whether the precept is stored in the auxiliary storage device. An image processing system featuring: