JPS62290289A - Image receiver - Google Patents

Abstract

PURPOSE:To simultaneously receive and display plurally plural moving images, or still images, on a single display device, by reading out reception data from a reception buffer, within the frame period of a picture memory, in a rectangular area on the picture memory. CONSTITUTION:An X1, a Y1, a DELTAX1, and a DELTAY1 are set at a position detecting means 10a as display areas from the outside, based on a communication with a transmission side. An AND circuit 33 outputs an ON signal when both outputs of flip-flops 32a and 32b are turned on. The output becomes the output of the position detecting means, and an output signal is turned on only during (X1, Y1)-(X1+DELTAX1, Y1+DELTAY1) of the reading position of image data. At the time of turning on the output of the AND circuit 33 in the position detecting means 10a, a reader 13a reads the reception data from a reception buffer 11a on a picture memory 14 as the image data, with the timing of a write sampling frequency, and the image data is reproduced to a video signal, then it is sent to a display device.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an image receiving device that simultaneously receives moving images and/or still images for a plurality of areas on a display device. be.

[Conventional technology]

2. Description of the Related Art Video conferencing is conventionally known as a conversational communication service using moving images and still images. Video conferences use high-efficiency encoding technology to transmit video or still image data to each other over regular audio lines or high-speed dedicated lines, and it is possible to display the other party's image on a display device. It is said that Additionally, in video conferences that connect multiple points, it is common practice to use multiple display devices to display images from multiple points, or to display images by switching screens on a single display device. .

Furthermore, in order to simultaneously display images of a plurality of points on a single display device, images a, b, c, and d of the terminal device 50 of each point are displayed as shown in FIG. 4(a).

e on the exchange 51, reduced in size in the image processing device 52, and synthesized into a plurality of divided screens as shown in FIG. A split-screen method has been proposed that displays images in advance. In addition,
FIG. 4(b) shows the screen of the terminal device whose image is a.

[Problem that the invention seeks to solve]

However, in conventional image transmission methods, one entire screen is transmitted as image data, so only a single image can be viewed on a single display device, and multiple images are used to simultaneously view the material and the other party. Conversation had the disadvantage of requiring complex equipment as described above.

In addition, if multiple display devices are required for video conferences connecting multiple points, or if a single display device is used,
There was a problem in that it was not possible to view images from all locations at the same time. Even if a screen splitting method as described in FIG. 4(b) is used to solve this problem, the image must be displayed in a reduced size, resulting in a reduction in resolution.

An object of the present invention is to provide an image receiving device that can simultaneously receive and display a plurality of moving images and/or still images on a single display device.

[Means for solving problems]

The present invention provides an image receiving device that receives image data in an image memory, including a position detecting means for detecting the position of a rectangular area on the image memory, a receiving buffer for storing data received from a communication line, and a position detecting means for detecting the position of a rectangular area on the image memory. A plurality of image data receiving circuits each comprising a reader that reads received data from the receiving buffer within a frame period of the image memory into a corresponding rectangular area on the image memory based on control of the means. It is characterized by

[Effect]

An image memory that stores images samples a video signal at a sampling frequency and stores it as image data. The image data is always read out at the timing of the sampling frequency, reproduced as a video signal and sent to the display device, and in the case of a video, the image data of the next frame is written and the screen is updated, and the still image In this case, the image data is retained by being written back to the image memory.

In the image receiving device of the present invention, data received from a communication line is stored in a reception buffer. Image reception in a rectangular area is realized by repeating reading the received data as image data from this reception buffer into a corresponding rectangular area in each frame period within a frame period of the image memory.

At this time, by mounting a plurality of image data receiving circuits in parallel, it is possible to receive data in a plurality of rectangular areas, and it is possible to receive a plurality of images on a single display device.

Further, since the size and position of the rectangular area are variable, it can be dynamically increased or decreased.

〔Example〕

FIG. 1 shows an embodiment of the image receiving device of the present invention. This embodiment is an example in which two image data receiving circuits are implemented.

In FIG. 1, reference numeral 14 denotes an image memory for storing image data, which is always refreshed at a constant frame cycle. 10a and 10b are position detection means, which detect whether or not the image data on the image memory 14 is within the set rectangular area when the position and thickness of the rectangular area on the image memory 14 are set; If it is within the range, outputs the on state, otherwise outputs the off state. lla and llb are reception buffers between the communication lines and use first-in, first-out memory (FIFO).

A selector 12 selects image data. 13a, 1
Reference numeral 3b denotes a reader that reads received data from the reception buffers 11a and llb as image data. 15 is a NAND circuit.

In the image receiving device having the above configuration, the position detecting means 10
a1 reception buffer 11a and reader 13a
An image data receiving circuit is configured, and the position detecting means 10b
, the receiving buffer 11b, and the reader 13b constitute a second image data receiving circuit.

These image data receiving circuits can operate independently.

FIG. 2 shows a specific circuit example of the position detection means 10a, 10b shown in FIG. Since the position detection means 10a and 10b have the same circuit configuration, only the circuit of one position detection means is shown. In the figure, 30a, 30b, 30c, 3
0d is a counter, 31a, 31b, 31c, 31d are comparators, and 32a.

32b is a flip-flop, and 33 is an AND circuit.

Next, the operation of the embodiment will be explained. In this embodiment, as shown in FIG.
+ , Y+ ), the received data is transferred from the receiver to the corresponding rectangular area within the frame period of the image memory (X, , Y, ) −(X+ +ΔX, ,
Y, +ΔY+) as image data,
and a rectangular area of arbitrary size (Δx2. ΔY2)
From an arbitrary position (χ2.Y2), the received data is transferred from the reception buffer to the corresponding rectangular area (X2, Y2) (X2+ΔX2.Y2) within the frame period of the image memory.
+ΔY2) as image data is repeated every frame period to achieve image reception in a rectangular area.

First, the operation of the first image data receiving circuit will be explained. The display area is X, , y, , ΔXl, ΔY1
is externally set in the position detecting means 10a based on communication with the transmitting side. Both counters 30a and 30b are counted by the horizontal synchronizing signal H, but the counter 30b is controlled by the output signal of the flip-flop 32a so as not to count until the start point Y1 of the Y coordinate is reached. The comparator 31a compares the output signal from the counter 30a and the value of the Y coordinate start point Y1, and when they are the same, outputs a cent signal to the flip-flop 32a,
Set the flip-flow knob 32a and connect the AND circuit 33.
and turns on the output to the counter 30b. The comparator 31b compares the Y-direction size ΔY1 with the output signal from the counter 30b, and when they are the same, outputs a reset signal to the flip-flop 32a to reset the flip-flop 32a and turn off the signal. Therefore, while the flip-flop 32a is on, it indicates that the vertical direction of the image data read position is within the rectangular area.

Similarly in the horizontal direction, counters 30c and 30d both use a basic clock CL that indicates the image data readout timing.
The counter 30d is counted by the starting point X! of the X coordinate. It is controlled by the output signal of the flip-flop 32b so as not to count until . The comparator 31c compares the output signal from the counter 30c with the value of the start point X+ of the Turn on the output to the counter 30d. The comparator 31d is
The direction size ΔX1 is compared with the output signal from the counter 30d, and when they are the same, a reset signal is output to the flip-flop 32b to reset the flip-flop 32d and turn off the output signal. Therefore, while the flip-flop 32b is on, it indicates that the horizontal direction of the image data read position is in a rectangular area.

The AND circuit 33 includes flip-flops 32a and 32b.
Outputs an on signal when both outputs are on.

This output becomes the output of the position detection means, and the reading position of the image data is (X+, Y+) (X+
The output signal is turned on only during +Δx, , Y, +ΔY+). After one frame is completed, the counters 30a, 30b, 3 are activated by the signal F indicating the beginning of the frame.
0c and 30d are reset and repeat the operation from the beginning.

In the first image data receiving circuit, image data is received via a communication line and stored in the input sofa 11a.

When the output of the AND circuit 33 of the position detection means 10a is turned on, the reader 13a writes the received data from the reception buffer 11a into the image memory 14 as image data. The written image data is read out at the timing of the sampling frequency, reproduced into a video signal, and sent to a display device.

On the other hand, in the second image data receiving circuit, the display area is X2. Y2. Δx2. ΔY2 is externally set in the position detection means 10b based on communication with one transmitting side. The subsequent operation is similar to that of the first image data receiving circuit.

When the outputs of both position detection means 10a and 10b are off, the selector 12 controlled through the NAND circuit 15 writes the read contents of the image memory 14 as they are to the image memory 14 and holds them. Only the area is updated.

With the above-described operation on the receiving side, if the sent data can be read within the frame period, images can be continuously received.

Since the image data receiving circuit can operate independently, by using two image data receiving circuits in parallel, two rectangular windows can be opened on one screen as shown in Figure 3, and each can display a different image. Reception 1 can be displayed.

In addition, although the explanation so far has not mentioned image band compression, image band compression is performed by adding an encoder to the transmitting side and a decoder to the image data receiving circuit.
Of course, it is also possible to transmit in an even lower band.

This embodiment corresponds to the case of moving images, but it can also be used for still images by transmitting and receiving frame by frame using a pair of image data transmitting and receiving circuits, and by sequentially transmitting and receiving data for multiple areas. I can handle it.

In addition, by using a high-resolution display device for displaying general television signals and video signals from video equipment such as video discs on multiple screens as image input signals, it is possible to display TVs, video discs, etc. on high-resolution display devices. It is also possible to simultaneously display and receive multiple low-resolution images.

〔Effect of the invention〕

By using the image receiving device of the present invention, it becomes possible to display multiple images simultaneously on a single display device, and it becomes possible to realize services that include a mixture of still images and videos, conference services between multiple points, etc. .

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the image receiving device of the present invention, Fig. 2 is a diagram showing an example of the position detection means, Fig. 3 is a diagram showing a rectangular area on the screen, and Fig. 4 is a diagram showing a conventional image receiving device. It is an explanatory diagram of a system, (a) is an overall block diagram, and (b) is a diagram showing an image displayed on a terminal device. 10a, 10b... position detection means 11a, l
lb...Reception buffer 12...Selector

Claims (1)

[Claims] (1) In an image receiving device that receives image data in an image memory, a position detection means detects the position of a rectangular area on the image memory, a reception buffer stores reception data from a communication line, and the position detection means A plurality of image data receiving circuits each comprising a reader that reads received data from the receiving buffer within a frame period of the image memory into a corresponding rectangular area on the image memory based on the control of Features of the image receiving device.