JPH05265685A - Multi-image display system - Google Patents

Abstract

PURPOSE:To attain multiwidow display and scaling display for moving and expanding/contracting an image in displaying. CONSTITUTION:A line memory 22 writes and successively reads out the image data of one line read out from a random port of an input memory 21. A selector 20 switches and selects image data supplied from the external and image data supplied from the line memory 22. Images already written in the memory 21 and images supplied from the external as image data are stord in the memory 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-image display system, and more particularly to a multi-image display system for displaying a plurality of images on the same screen.

[0002]

2. Description of the Related Art In the conventional index search by keywords, it is difficult to grasp the image of the event to be searched, and therefore, the index search by image has recently been used.

Such image index retrieval requires multi-image segment display.

In the conventional multi-image segment display system, as shown in FIG. 3A, the input image data coming from the terminal 10 is supplied to the serial port of the input memory 11 for writing. The image data at an arbitrary position stored in the input memory 11 is read from the random port, enlarged / reduced by the scaling processing circuit 12, supplied to the random port of the display memory 13, and written at an arbitrary position of the display memory 13. The image data stored in the display memory 13 is sequentially and repeatedly read out from the serial port, output from the terminal 14, and converted into a video signal by the subsequent circuit and displayed on the CRT.

[0005]

According to the conventional method, as shown in FIG.
After writing the image A in the display memory 13 as shown in FIG. 3A and then writing another image B as shown in FIG. 3B, the image A is overwritten by the image B on the input memory 11 The previous image A is erased from the memory 11.

For this reason, a multi-window display in which the image A which has already been written in the display memory 13 and is being displayed is moved to another position on the display memory B, or the image A is further enlarged or reduced. In the case of performing the scaling display such that the display memory 13 is written, the image A must be written in the input memory 11 again, and a plurality of images cannot be written in the image memory 13 at one time, and the multi-image cannot be written. There was a problem that it could not support window display and scaling display.

The present invention has been made in view of the above points,
An object of the present invention is to provide a multi-image display system capable of multi-window display and scaling display in which an image being displayed is moved and enlarged / reduced.

[0008]

According to the multi-image display system of the present invention, image data is supplied to a serial port of an input memory for writing, image data at an arbitrary position is read out from a random port of the input memory, and In the multi-image display system in which the read image data is written in an arbitrary position of the display memory and the image data is sequentially read and displayed from the display memory, one line of image data read from the random port of the input memory is displayed. It has a line memory for writing and sequentially reading, and a selector for switching and selecting image data supplied from the outside and image data supplied from the line memory, and has already been written on the input memory. The image and the image supplied as image data from the outside are stored in the input memory.

[0009]

In the present invention, a new image to be supplied next can be written in the input memory and all the images to be displayed can be stored in the input memory without erasing the image already written in the input memory. , These images can be enlarged / reduced and written in the display memory, or can be written and moved to another position on the display memory.

[0010]

1 is a block diagram of an embodiment of the method of the present invention. In the figure, those parts which are the same as those corresponding parts in FIG. 3 are designated by the same reference numerals, and a description thereof will be omitted.

In FIG. 1, the image data coming into the terminal 10 is supplied to and written in the serial port of the input frame memory 21 through the selector 20. The image data read from the arbitrary position of the input frame memory 21 is written in the arbitrary position of the display memory 13 through the scaling processing circuit 12.

When the image T supplied from the terminal 10 is overwritten while the image A is stored in the input frame memory 21, the image data of the line corresponding to the position where the image T is written is stored in the input frame memory 21. Are sequentially read from the random ports, written in the line memory 22, and read from the line memory 22 and supplied to the selector 20.

The selector 20 selects the output image data of the line memory 22 at a position other than the writing position of the image T of each line, selects the image data from the terminal 10 at the writing position of the image T, and selects the selected image data as an input frame. Memory 2
Write to 1.

As a result, the image A already written and the image T newly supplied from the terminal 10 are written in the input frame memory 21.

After the images A and T are stored in the input frame memory 21 in this way, the input frame memory 21
The images A and T can be read separately from each other, subjected to scaling processing, and written to arbitrary positions on the display memory 13 for display. That is, the display memory 13
It is possible to perform a multi-window display in which the image A already written in is moved to another position in the display memory 13 and a scaling display in which the image A is further enlarged or reduced and written in the display memory 13.

FIG. 2 shows a block diagram of an embodiment of an image processing apparatus using the method of the present invention.

In FIG. 2, RGB is externally applied to the terminal 30.
Each 8-bit image data comes in and is supplied to the selector 31. The image data selected by the selector 31 corresponding to the selector 20 is input from the serial port to the input memory 32,
It is written in 33 sequentially. The input memories 32 and 33 corresponding to the input frame memory 21 are duplicated because the memory writing speed is slower than the image data transmission speed. The memories 31 and 32 are supplied from the control unit 33 with a write address that sequentially increments from a predetermined address and indicates a write position of data that enters the serial port, and a read address that indicates an arbitrary read position. , 32 are enlarged / reduced by the scaling processing circuit 34 and displayed on the display memories 35-3.
8 is supplied to the random port and written in the position designated by the write address from the control unit 33. The display memories 35 to 38 are quadruple because the memory writing speed is slower than the output speed of the image data of the scaling processing circuit 34. The image data for one line read from the random port at the time of writing to the input memories 31 and 32 is sequentially written to the line memory 38 by the write address from the control unit 33 and sequentially read at the read address from the control unit 33. Supplied to the selector. The selector 31 receives the terminal 30 according to the switching control signal from the controller 33.
Or image data from the line separation 39 is selected. As a result, as described above, the new image T supplied from the terminal 10 is written in the input memories 31 and 32 in addition to the image A already written.

By the way, the image data read from the serial ports of the display memories 35 to 38 by the read address sequentially incremented from the predetermined address by the control unit 33 is supplied to the interpolation unit 40. The interpolation unit 40 performs interpolation only when the scaling processing circuit 34 performs enlargement, and outputs image data without interpolation in other cases, and the image data is serialized by the parallel / serial conversion unit 41. After that, it is perforated by the DA converter 42 to be a video signal, which is supplied to the mixer 43.

An image signal is supplied to the mixing section 43 from an external workstation via a terminal 44, and a synchronizing signal is supplied to the terminal 45 from the workstation. The PLL 46 generates a clock used in the DA converter 42 from this synchronization signal, and the synchronization signal generator 4
Reference numeral 7 generates a horizontal synchronizing signal and a vertical synchronizing signal inside the image processing apparatus from this clock and supplies them to the control section. The video signal (background image) from the workstation is converted to the video signal (window image) from the DA converter 42 in the mixing unit 43.
Are mixed and supplied from a terminal 48 to a display unit (not shown).

The memories 31, 32, 35 to 38, the scaling processing circuit 34, the line memory 39, the interpolation section 40, etc. are provided for each RGB color.

[0021]

As described above, according to the multi-image display system of the present invention, multi-window display and scaling display for moving and enlarging / reducing an image being displayed are possible, which is extremely useful in practice.

[Brief description of drawings]

FIG. 1 is a block diagram of the system of the present invention.

FIG. 2 is a block diagram of an image processing apparatus using the method of the present invention.

FIG. 3 is a diagram for explaining a conventional method.

[Explanation of symbols]

 12, 34 Scaling processing circuit 13, 35-38 Display memory 20, 31 Selector 21, 31, 32 Input memory 22, 39 Line memory

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location G11C 11/401

Claims (1)

[Claims] 1. Image data is supplied to a serial port of an input memory (21) for writing, image data at an arbitrary position is read out from a random port of the input memory, and the read image data is displayed in a display memory (13). In the multi-image display system in which the image data is written to an arbitrary position in the display memory and the image data is sequentially read and displayed from the display memory, the image data for one line read from the random port of the input memory (21) is written. A line memory (22) for sequentially reading, image data supplied from the outside and the line memory (2)
A selector (20) for switching and selecting the image data supplied from 2), and the image already written in the input memory (21) and the image supplied as image data from the outside are described above. A multi-image display system characterized by storing in an input memory (21).