JPH02230474A - Picture display processor - Google Patents

Abstract

PURPOSE:To easily synthesize and display picture data by writing the picture memory selection data into an area of a display control memory corresponding to a partial picture to be segmented out of each picture data. CONSTITUTION:The picture memory selection data to identify picture memory 10a - 10c is stored in an area of a display control memory 16 corresponding to the area where the picture data of each of plural picture memories 10a - 10c is displayed and outputted in advance. At display, plural memories 10a - 10c and display control memory 16 are scanned at one time and the contents of these memories are read out in parallel. The output selection circuits 14a - 14c select only the picture data read out of the picture memory corresponding to the picture memory selection data read out of the memory 16 and convert the picture data into the video signals. These video signals are outputted to a picture display device. Thus the picture data stored in the memories 10a - 10c are easily segmented for editing, synthesizing and displaying them.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an image display process for displaying and outputting image data stored in an image memory composed of a semiconductor memory element, etc. to an image display device. The present invention relates to a device, and particularly to an image display processing device suitable for displaying a composite image of image data stored in a plurality of image memories.

[Conventional technology]

2. Description of the Related Art Conventionally, image display terminals have been widely used to display and output data from electronic computers and the like.

This type of terminal is configured to convert computer output data into image data, write it into an image memory made of high-speed semiconductor elements, and display the contents of the image memory on an image display device. Furthermore, in the image display section of a terminal or workstation with processing functions, the display screen is divided into multiple small screens so that a large number of types of data can be referenced. They often have the ability to display different types of data. Such a function is called a multi-window function.

Typical conventional devices with multi-window functionality are:
The image data of the screen to be output for display is synthesized into the image memory, and this is displayed on the image display device. Figure 3 is a schematic configuration diagram of a typical device of this type, where 1 is a processing unit, 2 is a memory for storing data, etc., and 3 is the position and size of a small screen (window) that makes up the display screen. Window control table storing magnitude, 4
1. is a window control unit for controlling the display of each window; 10 is a display image memory for storing screen data to be displayed; 1. OO is a display control unit for reading image data from the image memory and generating a video signal to be output to an image display device, and 200 is a display unit. In the device configured in this way, image data corresponding to the screen to be output is stored in advance in the display image memory 10, and is read out and output to the image display device 200 via the display control unit 100. done to. To store display image data in the display image memory 10, the window control unit 4 stores the image data to be displayed in the window from the data memory 2 for display based on the window position and size in the window control table 3. Image memory 1
This is done by transferring to 0.

[Problem to be solved by the invention]

In the conventional device configured as shown in FIG. 3, in order to store image data to be output to the display image memory 10, every time a new window is created, deleted or changed, all image data is There is a problem in that the image must be transferred, which causes disturbances on the display screen. Furthermore, there is a limit to the number of windows that can be created depending on the size of the window control table 3 and the capacity of the window control section 4.

Furthermore, since the position and size of the window are managed using the window control table 3, the window shape is limited to a rectangle.

Therefore, when the amount of image data to be transferred becomes large, such as when a large number of shaded images processed by a divider are displayed in a composite manner, or when a large number of images are cut out using an arbitrarily shaped window and a large number of images are displayed in a composite manner, becomes a problem.

SUMMARY OF THE INVENTION An object of the present invention is to realize an image display processing device that is flexible in processing and can easily synthesize and display image data stored in a plurality of image memories connected to a computer on one screen. It is in.

[Means to solve the problem]

In order to achieve the above object, an image display processing device of the present invention includes an image memory that identifies a plurality of image memories so as to correspond one-to-one with the display area of each image data stored in the plurality of image memories. a display control memory for storing selection data; and a plurality of image memories as described above; a memory read control means for scanning the display control memory and reading out the contents of each in parallel; and image memory selection data read from the display control memory. Accordingly, the image forming apparatus is characterized in that it has a selection means for selecting read image data from the corresponding image memory.

[For production]

When displaying image data stored in multiple image memories connected to a computer in a composite manner on one screen, display control is performed in advance in accordance with the display output area of the image data of each of the multiple image memories. Image memory selection data for identifying the image memory is stored in the corresponding area of the memory. During display, a plurality of image memories and display control memories are simultaneously scanned, their contents are read out in parallel, and only the read image data from the image memory corresponding to the image memory selection data read from the display control memory is selected. The selected image data is converted into a video signal and output to an image display device. This allows you to cut out each image data stored in multiple image memories, edit it,
Composition and display can be easily achieved.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of an image display processing apparatus according to the present invention, and shows an example of the apparatus in which digital image data stored in three sets of image memories are displayed in a composite manner. In FIG. 1, reference numerals 10a, 10b, and 10c are two-dimensionally accessible image memories composed of semiconductor memory elements, and are structured so that they can be written to and read from by a processing device via an interface circuit 8. There is. lla, 1l
1.b, llc are image memory readout control circuits 12a, 12b, 12c and 1.b, llc that scan the image memories 10a, 10b, 10c at high speed in the X direction (horizontal direction) to generate addresses for reading image data; 3 a,
l 3 b + 1 3 c is each image memory 1 0
a, 10 b, 1. X-bun register and y-pan register that determine the readout start position of Oc, 1
4a, 1 4. b, 14c are output selection circuits that select the output of the image data read from the image memories 10a, 10b, and 10c, respectively. ''-5 is a high-speed data transfer bus for transferring control signals for reading image data from the image memories 10a, 10b, and 10c and the read image data.

16 is image memory 10a, 10b, 1
0c, a display control memory configured with a semiconductor memory element, 17 a display control memory read control circuit for reading out the display control memory 16, and 18 an interface for writing data into the display control memory 16 by a processing device or the like. It is a control circuit. 20 is image memory 10a, 10b
, 10c and a display control signal generation circuit 1 that generates a control signal for reading data from the display control memory 16.
00 is a display control circuit for converting digital image data into an analog video signal.

The operation of FIG. 1 is as follows. Here, it is assumed that different digital image data is stored in the image memories 10a, 10b, and 10c via the interface circuit 8. In order to synthesize and display such a plurality of image data on an image display device, the corresponding image data is passed through the interface circuit 18 to the corresponding area of the display control memory 16 corresponding to the portion of each image data that should be displayed and output. Write image memory selection data indicating the memory number.

On the other hand, the display control signal generation circuit 20 generates a control signal according to the video signal speed to be output, and the image memory readout circuit 11a, llb,
llc and display control memory readout control circuit 17, each image memory 10a, 10b,
Image data in 10c and image memory selection data in display control memory 16 are read out in parallel. The image memory selection data read from the display control memory 16 is transferred to each image memory 10 via the high-speed data transfer bus 15.
a, ]. Output selection circuits 14a, 14 inserted between Ob, 10c and the high-speed data transfer bus
b, 14c. Output selection circuit 14a, 1
4b and 14c output the image data read from the image memory to the high-speed data transfer bus 15 only when each image memory number and the image memory selection data match.

As described above, each image memory 10a, 10b,
The image data read out from 10c and selected according to the image selection data in display control memory 16 is input to screen display control circuit 100 via high-speed data transfer bus 15. The image display control circuit 100 converts the image data into an analog 8-channel video signal according to the control signal from the display control signal generator 20, and outputs the video signal from the VIDEO OUT terminal. In addition, each image memory 10
a, 1. When scanning Ob, 10c and reading image data, each X pan register 12a
, co-2b, 12c and y pan registers 13a, 13
By storing the readout start address in 13b and 13c, the readout position of each image data can be changed, so the display position of the image data on the screen can be freely set.

FIG. 2 is a diagram showing an example of image composition for intuitively understanding the operation of the image display processing device shown in FIG. Image data, (B) image memory selection data stored in the display control memory 16, and (C) an image to be displayed and output, respectively.

Now, as shown in FIG. 2, three sets of image memories 10a, 1
It is assumed that image data etc. synthesized by a processing device are stored in each of 0b and 10c. Further, it is assumed that a pattern of image memory selection data as shown in (B) is written in the display control memory 16. ■，■
,■ numbers indicate image memory numbers. At this time,
The image data in each of the image memories 10a, 10b, 10c in (A) and the image memory selection data in the display control memory 16 in (B) are simultaneously scanned and read out, and among the three types of image data, the image memory The display screen (C) can be constructed by selecting only the image data from the image memory that corresponds to the selected data. That is, the display control memory 16 determines which part of the image data in each of the image memories 10a, 10b, and 10c should be cut out and displayed in combination.
By simply writing a pattern of image memory selection data into the image memory, a composite display of these image data can be performed.

In this case, as shown in the figure, by writing image memory selection data in each display control memory 16 corresponding to an area surrounded not only by a rectangle but also by a polygon, a circle, or an arbitrary curve, each image memory 1 ．． 0 a, 1 0
The image data within b and 10a can be cut out in these areas and displayed in a composite manner.

Note that by extending the high-speed data transfer bus 15 and display control circuit 100 in FIG. 1 to color gradation images, composite display of color gradation images stored in the image memory becomes possible. That is, for example, for a single color image composed of red, green, and blue components, the high-speed data transfer bus 15 is configured so that the data of each component can be transferred simultaneously, and the display control circuit 100 is configured in three systems. It is obvious that the configuration may be such that the image data of each component is converted into a video signal.

〔Effect of the invention〕

As explained above, according to the present invention, in a processing device having an image memory configured with a semiconductor memory element or the like,
When displaying a plurality of image data processed or generated by a computer, etc., the above-mentioned image data A composite display can be performed. Therefore, there is no need to separately provide a screen display memory and transfer display image data to it to generate a display screen, so there is an advantage that there is no need to provide a processing mechanism for performing such processing. .

Furthermore, since the image data in each image memory is configured to be transferred to the display control circuit via a high-speed data transfer bus, the image memory can be easily expanded or changed. .

Furthermore, since there is no limit to the number or shape of the image memory selection data patterns written to the display control memory, the image data stored in the image memory can be written not only in a rectangular shape but also in an area surrounded by an arbitrary curve. It can be cut out and displayed in a composite manner. Therefore, editing and compositing of images, such as cutting out only a specific figure from the image data in the image memory and displaying it superimposed on another image, can be easily performed.

In this way, by adopting the configuration of the present invention, it is possible to process the image data itself stored in the image memory,
Since it is possible to cut out, edit, and combine images from these image data without converting them, it is possible to display and display images that have been cut out, edited, and synthesized from these image data without converting them. A device that is effective for the application can be realized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of an image display processing device of the present invention, and FIG. 2 is a diagram showing an example of image synthesis according to the embodiment of FIG.
FIG. 3 is a schematic diagram of a conventional device having a multi-window function. 10a, 10b, 1, O c-image memory, 11a, l
lb, llc...image memory readout control circuit, 1
4 a, 14 b, 14 c - output selection circuit, 16... display control memory, 17... display control memory read control circuit, 20... display control signal generation circuit, 100... image display control circuit.

Claims (1)

[Claims] (1) In a device that displays image data stored in a plurality of image memories in a composite manner on one screen, the image memory is arranged in a one-to-one correspondence with the display area of the image data of each of the plurality of image memories. a display control memory storing image memory selection data to be identified; scanning the plurality of image memories and the display control memory;
An image characterized in that it has a memory read control means for reading each content in parallel, and a selection means for selecting image data to be read from the corresponding image memory based on the image memory selection data read from the display control memory. Display processing device.