JPH04258994A - Image display controller - Google Patents

Abstract

PURPOSE:To offer the image display controller which can synthesize and display plural image informations at a high speed in an arbitrary position on a display screen by only changing the respective read-out addresses of the image informa tion stored in plural storage means. CONSTITUTION:Based on a display address on a display part 106 on which each of each image information stored in an image memory 104 and a plotting memory 107 is displayed, an address value of the image information of each of these image memory 104 and plotting memory 107 is stored. In accordance with these stored address values, the corresponding image information is read out of each of the image memory 104 and the plotting memory 107, and by an arithmetic part 105, each of these image information is synthesized and can be displayed on the display part 106.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display control device, and more particularly to an image display control device that synthesizes and displays a plurality of characters, figures, image information, etc.

0002

2. Description of the Related Art FIG. 3 shows the configuration of a conventional image display device. In FIG. 3, 301 indicates a video signal output from a video camera, VTR, etc., and this video signal 301 is separated into a clock signal 16, a horizontal synchronization signal, an image signal, and a vertical synchronization signal by a synchronization separation section 302. . A horizontal write counter 303 generates a horizontal address for writing image data into the image memory 305. This horizontal write counter 302 is preset to a desired value by a horizontal synchronizing signal, counts clock signals, and generates address signals. A vertical write counter 304 is preset to a desired value by a vertical synchronization signal, counts horizontal synchronization signals, and outputs a vertical address of the image memory 305 in order to write an image signal to the image memory 305. . On the other hand, the image signal is A
After being converted into a digital signal by the /D converter 306,
The data is written to the address of the image memory 305 indicated by the horizontal write counter 303 and the vertical write counter 304 according to the clock signal.

[0003] 308 is a character displayed on the display section 313;
It shows a display memory in which drawing information such as figures is written, and this drawing information is written into the display memory 308 according to instructions from the CPU 307. Reference numeral 310 denotes a display control memory in which information indicating the type of calculation between the image signal written in the image memory 305 and the drawing information written in the display memory 308 is written under the control of the CPU 307 . The information indicating the type of calculation includes information indicating the priority order of image information, information indicating the priority order of drawing information, and information for taking the average of drawing information.

The information indicating the type of operation written in the display control memory 308 in this way is stored in the vertical read counter 30.
9 and the address value output from the horizontal read counter 311 and input to the arithmetic unit 312. The calculation unit 312 calculates the image information in the image memory 305 and the drawing information in the display memory 308 according to the information output from the display control memory 310, and displays the information on the display screen of the display unit 313.

[0005]

[Problems to be Solved by the Invention] FIG. 4 is a diagram showing an example of changing the display position of image information displayed on the display unit.
The display position of 3 has been changed. 400 shows the display state before changing the front position, and 401 shows the state after changing the display position of these images. Also, 410, 41
2 indicates drawing information (characters) stored in the display memory 308, and 411 indicates image information stored in the image memory 305. Changing the display positions of such a composite image 402 of image information and drawing information and an image 403 of only drawing information is executed in the conventional apparatus shown in FIG. 3 as follows. (2) The display position of each image on the display section 313 is changed by changing the values preset in the vertical write counter 304 and the horizontal write counter 303 to desired values. (2) The drawing information 410 and the drawing information 412 written in the display memory 308 are drawn on the display memory 308 again so that they are displayed at a desired position on the display section 313. ■ Calculation information for combining image information 411 and drawing information 410 is stored in addresses of display control memory 310 that are associated with display positions on the display screen of display unit 313. For example, as shown in FIG. Image information 41 as shown
1 and the drawing information 410, it is necessary to rewrite this calculation information to a predetermined address.

As described above, in the conventional example described above, in order to move the composite image as shown in FIG.
Because two operations are performed, the following problems arose. That is, (1) rewriting the drawing information to the display memory 308;
Since it is necessary to rewrite the calculation information to the display control memory 310, the movement of the composite image is slow. (2) Movement of image information 411, drawing information 410, 412
Since the three operations of moving , and moving the calculation information in the display control memory 310 are performed sequentially, the intermediate results of the movement are sequentially displayed on the display screen of the display unit 313 during each of these moving operations. In particular, when moving the calculation information in the display control memory 310, the drawing information 410, 41
There is a possibility that unexpected image display, such as displaying image information that was originally hidden, may occur due to the specification of priority display processing in step 2.

The present invention has been made in view of the above-mentioned conventional example, and it is possible to quickly display a plurality of pieces of image information at any position on a display screen by simply changing the readout address of each piece of image information stored in a plurality of storage means. An object of the present invention is to provide an image display control device that can synthesize and display image information of .

[0008]

Means for Solving the Problems In order to achieve the above object, an image display control device of the present invention has the following configuration. That is, the image display control device displays a plurality of different image information simultaneously on the same screen, and includes a plurality of storage means each capable of storing different image information, and display coordinates of each of the image information on the display screen. address storage means for storing address values of image information of each of the plurality of storage means, and a corresponding one of the plurality of storage means according to the address value stored in the address storage means; It has a reading means for reading image information, and a display means for synthesizing the image information read by the reading means and displaying it on a display screen.

[0009]

[Operation] With the above configuration, the address value of each of the image information in the plurality of storage means is stored based on the display coordinates on the display screen of each of the different stored image information. Corresponding image information is read out from each of the plurality of storage means according to the stored address value, and these image information can be combined and displayed on the display screen.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. <Description of configuration of image display control device (FIG. 1)> FIG. 1 is a block diagram showing a schematic configuration of the image display control device of this embodiment.

In the figure, reference numeral 101 indicates an input image signal. When this image signal 101 is input to an interface unit 102, a clock signal for each pixel is extracted and output to an image memory 104 and a counter 103. Further, the interface unit 102 converts the input image signal 101 into image information on a pixel basis and outputs it to the image memory 104. The counter 103 counts the number of pixels written to the image memory 104 in response to a clock signal from the interface unit 102, and outputs a write address for pixel data to be written to the image memory 104 next. 10
5 is an arithmetic unit which operates the image memory 104 and the drawing memory 1 according to the control information stored in the display control memory 108.
The display data from 07 are calculated and output to the display unit 106. 106 is a display unit that displays image information from the calculation unit 105 in accordance with various synchronization signals output from the readout control unit 109.

A drawing memory 107 stores drawing information such as characters and figures displayed on the screen of the display unit 106, which is one of storage means for storing display information. Information is written to drawing memory 107 under the control of CPU 111. 108 is a display control memory in which, under the control of the CPU 111, calculation information between the image data in the image memory 104 and the drawing memory 107 is stored. Further, a default value of information indicating the type of calculation is set in the display control memory 108, so that priority is given to the drawn image.

Reference numeral 112 denotes a display memory serving as an address storage means, in which image information in the image memory 104 to be displayed and image information in the drawing memory 107 are stored for each pixel on the display screen of the display unit 106.
The storage address value of the drawing information is written by the CPU 111. This allows the image data to be transferred to the display unit 10.
6, the image memory 104 and the drawing memory 1
The read address of 07 is output. In this embodiment, the address output from the display memory 112 is the image memory 104, the drawing memory 107, and the display control memory 1.
It is supplied to 08.

111 is a CPU, a keyboard 110
The writing of the image signal 101 into the image memory 104 is controlled according to instructions input from the controller. In addition, the image memory 10
When the coordinate position at which each pixel of the image information written in 4 is to be displayed on the display unit 106 is determined, the image memory 10
The address value of each pixel data in 4 is calculated and written. Further, the CPU 111 writes drawing information such as characters and figures to be displayed in the drawing memory 107.

Below, the number of horizontal pixels of the input image signal 101 is XS, the number of vertical pixels is YS, the coordinates of an arbitrary pixel P of the input image signal 101 are (xS, yS), and the display section 10
The number of pixels in the horizontal direction of 6 is Xd, and the number of pixels in the vertical direction is Y
d, the coordinates on the display unit 109 where the pixel P should be displayed are (x
d,yd), and the operation of this embodiment will be described below with reference to FIG.

Input image signal 101 from keyboard 110
When the horizontal and vertical pixel numbers XS and YS and the display position on the display section 106 are input, the CPU 111 presets the value of the counter 103. Pixel data from which the clock signal has been separated from the image signal 101 by the interface unit 102 is input to the image memory 104 and written into the address output from the counter 103 in synchronization with the clock signal. When one pixel data is written in this way, the counter 103 is incremented by a clock signal, and the next pixel data is written to a new address in the image memory 104. In this way, the pixel data is transferred from the address “0” of the image memory 104 to “XS・YS −1”.
”Even the address is written.

On the other hand, the CPU 111 stores the image memory 10 in which the image to be displayed is written in the address of the display memory 112 corresponding to the coordinates at which the image is to be displayed on the display unit 106.
Write the address value of 4. That is, the aforementioned pixel P(xs
The address value of the image memory 104 storing the information of
, and the coordinates (x
d, yd) on the display memory 112 is represented by {Xd (yd -1)+xd -1}.

FIGS. 5 to 8 show such relationships. FIG. 5 is a diagram showing an area of input image information 101 where the number of pixels in the horizontal direction is XS and the number of pixels in the vertical direction is YS, and FIG. 6 shows a state in which this image information is stored in the image memory 104. The pixel P in FIG. 5 has the address {XS ・(
yS −1)+xS −1}. 7 shows a state in which the image information shown in FIG. 5 is displayed on the display screen of the display unit 106, and FIG. 8 shows a state in which the image information shown in FIG.
2 shows a state in which the address of this image information is stored. At this time, the address of the display memory 112 of the pixel P is {Xd (yd −1) + xd −1}, and the address of the pixel P is in this address. An address value {XS·(yS−1)+xS−1} on the image memory 104 is stored.

[0019] In this way, the CPU 111
When an instruction is given to display an image above, the address value of the image information on the image memory 104 is stored in the address on the display memory 112 corresponding to that area. In addition, the CPU 111 stores drawing information such as characters and figures to be displayed after calculation with the input image information 101 into the drawing memory 111.
Write to 07. The write address at this time is the same as the write address of the image memory 104 to which the pixel data to be subjected to the calculation of the input image information is written. Furthermore, C
The PU 111 writes calculation information indicating the desired type of calculation into the display control memory 108. This write address is the same as the write address in the image memory 104 of the pixel data to be calculated on the input image information 101.

Input image information 101 and drawing information such as figures that are not to be calculated and displayed are stored in the drawing memory 107 at an address (
Written after XS/YS). Furthermore, the address value of the drawing memory 104 in which the drawing information is written is the address value of the display unit 1
It is written into the address on display memory 112 corresponding to the display position on 06.

The respective data written in the image memory 104, the drawing memory 107 and the display control memory 108 are read out by the readout control unit 109 and the display memory 112.
It is read out in synchronization with the display operation of the display unit 106. That is,
When various synchronization signals are output from the readout control section 109 to the display section 106, the display memory 1 is outputted in synchronization with these synchronization signals.
12 are read out sequentially. Pixel data of the image information in the image memory 104 and the drawing memory 10 in relation to the image information.
When pixel data is read out from pixel data 7 and calculated, the display memory 112 outputs the address value of the display control memory 108 that stores the image information address, drawing information address, and calculation type information regarding the pixel data. . By outputting these addresses, the image memory 1
Image information of the pixel is read from 04, and drawing information of the pixel is read from the drawing memory 107. Each of the outputs from the image memory 104 and the drawing memory 107 is input to the calculation unit 105. This calculation section 105
Now, the pixel data from the image memory 104 and the pixel data from the drawing memory 107 are calculated according to the information indicating the calculation type of the pixel output from the display control memory 108, and the results are input to the display unit 106. indicate.

Furthermore, in an area where only the drawing information stored in the drawing memory 107 is displayed, the address of the drawing memory 107 output from the display memory 112 is
Since the image storage address value is set larger than the image storage address value of 04, no image information is read out from the image memory 104 correspondingly. As a result, the drawing memory 107
The drawing information read from is outputted to the display section 106 and displayed on the display section 106 through a calculation that gives priority to the drawing information set by default in the calculation section 105.

Next, a process of moving image information obtained by combining drawing information and image information in this embodiment will be explained.

Here, the display position of the pixel P mentioned above is expressed by the coordinates (
Consider the case of changing from xd , yd ) to (xd ′, yd ′). When this movement is instructed, the CPU 11
1 is the address of the display memory 112 {Xd (yd −1
)+xd -1} is the value stored in {XS (yS
-1)+xS -1} to the address {Xd (yd'-1)+xd'-1} of the display memory 112. As a result, the pixel P is displayed at the coordinates (xd', yd') on the display screen of the display unit 106. In this way, the information on the pixel P in the image memory 104, the drawing memory 107, and the display control memory 108 can be changed in the display section 106 by simply changing the value in the display memory 112 according to the movement. The display coordinates of point P are moved from (xd, yd) to (xd', yd') and displayed.

<Other Embodiments> FIG. 2 is a block diagram showing a schematic configuration of an image display control device according to another embodiment of the present invention, and parts common to those in FIG. 1 described above are designated by the same numbers. Here, in addition to the configuration of the above-described embodiment, a case is shown in which an address converter 113 is added to the address output from the display memory 112 to the image memory 104.

This address converter 13 includes a CPU 11
1 gives the addition address. As a result, the address value set in this address adder 113 is added to the address value input/output from the display memory 112.
This is output as the address of the image memory 104.

In FIG. 2, as described above, the image memory 1
When image information A is written from address “0” of 04,
The CPU 111 sets the addition address of the address converter 113 to "0", and as in the previous embodiment, the image memory is stored in the address of the display memory 112 corresponding to the coordinates of the image information A on the display screen of the display unit 106. Address values corresponding to each pixel of image information A of 104 are written.

Next, image information B having the same number of pixels in the horizontal direction and the same number of pixels in the vertical direction as this image information A is written from address "20" in the image memory 104, for example. However, this "20" is a value equal to or larger than the total number of pixels of the image information A. In order to display this image information, the CPU 111 sets the addition address value of the address converter 113 to "20" without changing the contents of the display memory 112. As a result, the address converter 113 outputs an address obtained by adding "20" to the address value output from the display memory 112. Image information B is read from the image memory 104 according to the address value output from the address conversion unit 113,
Image information B is displayed in place of image information A at a predetermined position on the screen of display unit 106.

In this way, by setting "0" or "20" to the addition address of the address converter 113,
Display of image information A or image information B can be selected. As a result, the image memory 1 for the same drawing information
04 image information can be instantly switched and displayed. In this case as well, movement of the image information obtained by combining the image information in the image memory 104 and the drawing information in the drawing memory 107 is realized in the same manner as in the conventional example described above.

It should be noted that, as the address conversion unit used in this embodiment, in addition to using an adder that actually performs addition, a configuration using, for example, a look-up table or the like is also possible.

As explained above, according to this embodiment, information obtained by a specified calculation among various pieces of information to be displayed can be displayed by moving to an arbitrary position on the display screen at high speed. .

[0032]

Effects of the Invention As explained above, according to the present invention, by simply changing the readout address of each image information stored in a plurality of storage means, a plurality of image information can be displayed at any position on the display screen at high speed. This has the effect of being able to synthesize and display image information.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of an image display control device according to an embodiment.

FIG. 2 is a block diagram showing a schematic configuration of an image display control device according to another embodiment of the present invention.

FIG. 3 is a block diagram showing the configuration of a conventional image display control device.

FIG. 4 is a diagram for explaining problems related to displaying a composite image in a conventional image display control device.

[Figure 5]

FIG. 6 is a diagram showing image information in this embodiment and a state in which the image information is stored in an image memory.

[Figure 7]

FIG. 8 is a diagram showing image information on a display screen and a state in which the image information is stored in a display memory in this embodiment.

[Explanation of symbols]

101 Input image signal 102 Interface section 103 Counter 104 Image memory 105 Arithmetic unit 106 Display section 107 Drawing memory 108 Display control memory 111 CPU 112 Display memory

Claims (2)

[Claims] 1. An image display control device that simultaneously displays a plurality of different image information on the same screen, the device comprising: a plurality of storage means each capable of storing different image information; and a plurality of storage means each capable of storing different image information; address storage means for storing the address value of each of the image information in the plurality of storage means based on the display coordinates in the plurality of storage means; and each of the plurality of storage means according to the address value stored in the address storage means. An image display control device comprising: a reading unit for reading out more corresponding image information; and a display unit for synthesizing the image information read by the reading unit and displaying the composite on a display screen. 2. Further comprising calculation information storage means for storing the type of compositing calculation processing when composing the plurality of image information, and the display means displays information according to the calculation information stored in the calculation information storage means. Claim 1, characterized in that the image information read out by the reading means is combined.
The image display control device described in .