JPS6148890A - Multi-image display 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 [Field of Industrial Application] The present invention relates to a multi-image display method in a display device that uses a look-up table to adjust the shade and hue of an image.

[Conventional technology]

As this type of display device, the CR shown in FIG.
T display device configurations are known. In the figure, 1 is a system bus, and 2 and 3 are first and second systems that store the image data of each block when divided into two blocks (512 x 256 pixels) corresponding to two images. Memory, 4 is an image memory for storing image data (512 x 512 pixels) corresponding to one screen for displaying two images as one screen on a CRT, and 5 is an image memory read out in accordance with the scanning of the CRT. A look amplifier table 6 serves as a memory for converting data into so-called color information, etc., using the data of 4 as an address input and the corresponding data output as a CRT degree and hue signal (Y). 7 is an image memory write circuit that transfers the image data in the system memory 2.3 to the image memory 4, and 8 is the contents of the lookup table 5. This is a lookup table writing circuit that rewrites the .

FIG. 5 is a diagram for explaining the contents of each memory during operation of the conventional system shown in FIG. Correspondingly,
Each image consists of 512 x 256 pixels, each pixel data in the first system memory 2 is represented as X, and each pixel data in the second system memory 3 is represented as x2.

Furthermore, 4 corresponds to image memory 4, and is 512×51
It consists of 2 pixels, and 5 corresponds to lookup table 5. Here, each image data is managed in units of, for example, 8-bit data, and is subjected to transfer processing and the like.

In this conventional method, in order to simultaneously display the image data in the first system memory 2 and the second system memory 3 on a CRT (not shown), the image data in the system memories 2 and 3 are transmitted through the image memory writing circuit 7. The pixel data X1 and X2 are transferred to the image memory 4 (pixel data X is transferred to the A area, and pixel data x2 is transferred to the B area), and each pixel data is transferred to the lookup table 5. Common display function Y-F (
Write X). Display function Y=F (in Xl,
Y represents brightness and color information (output data of lookup table 5), and X represents pixel data (address input data of lookup table 5).

FIG. 6 shows the display functions Y l= F I (x) and Yz = F z for pixel data in system memories 2 and 3.
(In this example, when xl is specified, in order to display two image data at the same time, when transferring pixel data x1 and x2 to image memory 4, , i.e., Xl =F
+ (Xl) and Xt =Fz (X2), the results are stored in areas A and B in the image memory 4, and normalized to the display function Y=x in the lookup table 5.

[Problem that the invention seeks to solve]

Of the above two operation examples related to the conventional method, in the former method, since the lookup table 5 is common, by changing the display function of the lookup table 5, the shading of the pixel data x and x2 can be changed simultaneously. Although it is possible to change the shading of only one pixel data, the corresponding pixel data in the image memory 4 must be changed.

On the other hand, when a plurality of images having different display functions are displayed simultaneously as in the latter case, complicated calculations are required, making high-speed display impossible.

[Purpose of the invention]

An object of the present invention is to provide a multi-image display method that can display multiple images on the same screen and control them with a simple configuration and at high speed.

[Means for solving problems]

In this invention, when writing pixel data to an image memory with a conventional configuration, identification information such as an image number that can be determined corresponding to each information source is added to each pixel data, and a look-up table is created with the image numbers. The above-mentioned problem is solved by performing divisional control corresponding to the following.

[Effect]

By dividing and controlling each pixel data according to the image number in this way, when displaying multiple images simultaneously on the same screen, for example, when changing the gray scale display of a specific image, the image data in the image memory can be changed. It also eliminates the need for complex calculations on multiple images with different display functions.

〔Example〕

FIG. 1 is a block diagram of a preferred embodiment of the present invention, in which 101 is a system bus, 102 is a first system memory (512×25
6 pixels, data length of 1 pixel is 8 bits), 103 is a second system memory that stores the second image data
(512 x 256 pixels, data length of 1 pixel is 8 bits)
, 109 is an image memory for storing pixel data corresponding to the screen for display on a CRT (not shown) (512 x 512 pixels, data length of one pixel is 8 bits), 110 is for storing an image number. memory (
512 x 512 pixels, 1 data is 4 bits), 111 is 12 bits (bit length of image number storage 109 + bit length of image number storage memory 110), and has an 8-bit resolution divided into multiple blocks. Each corresponding block is selected based on number information in a look-up table designation register 112 for designating a specific image number via the image number storage memory 110 or the system bus 101.

A selector 113 determines whether to enable the output from the image number storage memory 110 or the contents of the index table specification register 112;
14 is a D/A converter that converts the output of the look-up table 111 into a video signal, and 115 is a system memory for transferring pixel data to the image memory 109 and simultaneously transferring the image number to the image number storage memory 110. A memory write circuit 116 is a lookup table write circuit that rewrites the lookup table 111. 2 is a diagram showing the contents of each memory during operation of the embodiment shown in FIG. 1, and the reference numbers given to each block correspond to those in FIG. 1.

Here, with reference to FIGS. 1 and 2, image data in the first system memory 102 and image data in the second system memory 102 will be described.
Data processing when simultaneously displaying image data of No. 3 on a CRT will be described.

First, prior to writing the first pixel data in the system memory 102, a processor (not shown) in the system writes an image number (1,D )
0". Thereafter, the memory write circuit 115 transfers the pixel data x1 of the first system memory 102 to the image memory 109. At this time, the image number "0" is written to the image number storage memory 110. .Similarly,
Second pixel data x2 in second system memory 103
is assigned with the image number "1", "1" is stored in the corresponding area of the image number storage memory 110, and
It is transferred to image memory 109. Through these operations, the pixel data x1 in the first system memory 102 is transferred to the A vj area of the image memory 109, and the image number "O" is transferred to the image number storage memory 110, as shown in FIG. Similarly, the pixel data x2 in the second system memory 103 is transferred to the B area in the image memory 109, and the image number "1" is transferred to the D area in the image number storage memory 110. transferred to the area.

Now, referring to FIG. 2, lookup table 11
1 is here divided into 16 blocks O~15,
These block numbers correspond to each screen number. Now suppose that the processor writes a display function with image number "O" (ID "0") to block O, and a display function with image number "1" (ID "l") to block 1. do. When the first pixel data x1 is read out, the image number "0" of the corresponding area C is simultaneously read out from the image number storage memory 110, and the corresponding block 0 in the lookup table 111 is accessed. be done. Similarly, when the second pixel data x2 is read out, the image number "1" in the corresponding area is read out, thereby accessing the corresponding block 1 in the lookup table 111.

Therefore, each image can be independently manipulated only by changing the contents (display function) of the lookup table corresponding to the image number. In addition, if all displayed images are to be displayed according to the same display function, the output of the image number storage memory 110 is prohibited using the selector 113 in FIG. This can be achieved by setting the image number of the look amplifier table 111 so that only the specified block of the look amplifier table 111 is accessed.

In the embodiment shown in FIG. 2, this method is used with the bit length of the image memory and lookup table being larger than that of the pixel data. An example of application will now be described with reference to FIG.

Although FIG. 3 is an explanatory diagram of the operation, the configuration is the same as that in FIG. I will explain using

First, pixel data x1 in the first system memory 2
When transferring the pixel data x1 to the image memory 117 (corresponding to 4 in FIG. 1), the pixel data x1 is compressed to %X+
”!/SX+, and the remaining 1 bit MSB is
” as the image number and transferred to the image memory 117.Therefore, the first pixel data x1 is assigned the address of the upper half of the lookup table 118 (address 0~7F)
For pixel data x1, address O~7
Access only F. Similarly, the pixel data XZ in the second access memory 3 is compressed and converted to Xz=%Xz, and the image number "
1'' is set and transferred to the image memo 1J17, and in this regard, only the addresses in the lower half of the lookup table 118 (addresses X'80'' to X'FF') are accessed. As described above, by compressing and converting each pixel data and adding an image number, the same operation as in the embodiment shown in FIG. 1 becomes possible.

As described above, in this embodiment, the explanation is centered on an example of a CRT display device, but the display format is not limited to a CRT, and a display device such as a liquid crystal may also be used. Of course. Further, the identification information for identifying an image is not limited to a number, and various codes can be used, and the processing of image data is not limited to 8 bits.

Further, in the embodiment, an example having two system memories is described, taking as an example a case where two images are displayed on the same screen, but it goes without saying that this is not limited to two screens. Furthermore, although the memory for storing identification information is separate, a memory integrated with the image memory may be used.

〔Effect of the invention〕

In this invention, when image data is transferred to the image memory, identification information for identifying the image is added and transferred, and the lookup table is divided and used in correspondence with the identification information. The display and operation of multiple images displayed on the screen at the same time must be performed without sufficient identification information.
This can be achieved with simple and high-speed processing by controlling this and changing the divided lookup tables.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the multi-image display system according to the present invention,
FIG. 3 is an explanatory diagram of the contents of each memory during operation of the embodiment of FIG. 1, FIG. 3 is an explanatory diagram of the operation in the second embodiment of the present invention, and FIG. 4 is a configuration of a conventional multi-image display system. 5 is an explanatory diagram of the contents of each memory during operation of the conventional system, and FIG. 6 is an explanatory diagram of the operation of another conventional system. 101...System bus 102.103...System memory' 10
9...Image memory 110...Image number storage memory 111...Lookup table 112...Lookup table specification register 113...Selector 114...D/A converter 115...Memory writing circuit 116...Lookup table writing circuit Patent applicant Fuji Electric Manufacturing Co., Ltd. Same as above Fuji Facom Control Co., Ltd. Agent Patent Attorney Tetsuya Mori Agent Patent Attorney Yoshiaki Uchifuji Agent Patent Attorney Shimizu Authorized Agent Patent Attorney Nobu Kajiyama Figure 1 Figure 2 Y (Eye VH/Table λ Encounter F-7) Figure 3 Y (End layer!! Tomo 〒'-7) Figure 4 Figure 5 Figure 6 Procedures (Masashi Fu: (spontaneous) August 18, 1980 Patent application filed on August 16, 1980 ( 2) 2. Name of the invention Multi-image display method 3. Relationship with the person making the amendment Patent applicant name: Fuji Electric Manufacturing Co., Ltd. (1 other person) 4. Agent address: 4-2 Marunouchi-chome, Chiyoda-ku, Tokyo No. Tokyo Bank Building, 9th floor, 917th Ward Nichiei Patent Office Detailed description of the invention in the specification 6, Contents of amendment

Claims (2)

[Claims] (1) In a multi-image display method that displays a plurality of image information on the same screen, a memory that stores identification information for identifying the plurality of images in correspondence with pixel data for the image; A multi-image display method characterized by comprising a lookup table that is accessed in accordance with data and converted into predetermined color information, etc. (2) The identification information is a screen number provided corresponding to an image, and the memory is a memory different from an image memory that stores display screen information corresponding to one screen. The multi-image display method described in scope 1.