JPS59168786A - Television still picture transmitter - Google Patents

Abstract

PURPOSE:To make the best use of a transmission line efficiently by distinguishing a significant image such as the image of personnel or the image of a commodity from a meaningless background part being its background in a still picture so as to reduce the amount of information of the still picture to be transmitted. CONSTITUTION:A dynamic picture signal A is obtained by photographing an object 6 having the image of personnel by a television camera 1. The video image signal of the personnel and the signal of the background part are discriminated by a chromakey circuit or the like. Further, when a still picture transmitter 2 converts the background part to a run length code and the part of image of personnel into a digital signal respectively and the signals are read for one frame's share at a proper speed to obtain a still picture low speed transmitting signal B. A still picture receiver 3 speed converts the signal B to store and inserts a proper background signal in a period corresponding to the run length code and converts the digital signal into an analog signal to display the analog signal on a television monitor.

Description

[Detailed description of the invention] [Fields of use on the tumor rack] This invention is a portrait of a person in a live performance, TV conference, etc.

Still image transmission tips [related to iC] that are useful when transmitting luxurious still images such as product images posted on Parts Kameroku to a remote location.

[Spine technology and its problems] For example, in a remote conference system, when sending an image of a person participating in a meeting, the person's image is photographed with a television camera, and the video signal obtained by the television camera is used. 1 frame 1 picture 11
! A signal is sent to the venue, converted to a digital signal, and transmitted to the other venue via a telephone line, satellite line, etc.

In this method, the human image is converted into a digital signal and only one frame is displayed as a still image, so the transmission speed decreases by τ
Φ, and has the advantage of being able to use a narrowband transmission line.

However, even if the band is narrow, if there is a lot of data to be sent,
There is a problem that the transmission time becomes long.

[Purpose of the Invention J This invention was made in view of the actual situation. Among still images, there are significant images such as human images and product images, and the meaningless background portion 2 that is the background. The present invention provides a television still image transmission device that can efficiently utilize transmission lines by dividing and reducing the amount of information of transmitted still images.

[Summary of the invention]

In order to achieve the above-mentioned purpose, this generator converts the image signal into a digital signal, and applies chroma technique to the digital signal to convert it into an image signal. A run-length code is inserted into the background and f) signal sections to form the transmitted signal 1g. therefore,
Since the background part is replaced with a run-length code indicating the period, the output signal can be almost the same as the signal τΦ corresponding to the significant image part, and the information it is compared to the conventional one-frame frame. 172-11 compared to still image information that sends minutes
It is possible to perform DingΦ, also known as ρ, at around 5.

Embodiment FIG. 1(a) is a diagram showing an overview of the transmission and reception of this almost bright television still image, in which 1 is a television camera;
2 is a digital encoding circuit, a ripple mark key circuit, and a run-length encoding 1gl circuit, as in Junsho Dingshin.

The redemption circuit is well prepared. It is a still image transmitting device.

Further, 3 is a still image receiving tc position which receives an encoded still image signal and converts it into a still image signal again. 21%, Background 1iiiI include image code generation circuit, multiplexing circuit, run-length virtual code circuit, etc., 4
5 is a television monitor that displays still images, and 5 is the still image transmitting device 2. The timing of the still image receiving device 3 is shown in the transmission/reception control device t' that controls the timing of the still image receiving device 3.

eF, the operation of this still image transmission device will be explained with reference to the waveform diagram of FIG. 1(b).

Now, when a subject 6 with a human figure is photographed by the television camera 1, a moving image signal A is generated. In this case, the background part of subject 6 should be set to a different color (for example, blue) from the beggar image (and the image signal of the person who will become the image and the signal of the background part should be set to a different color (for example, blue)). It can be easily identified by the road, etc.

Therefore, the still image transmitting device 2 scans the background part. I
A digital signal (PCM, DPCM
, ΔMADPCM code, etc.), one frame is read out at an inappropriate speed, and a still image low-speed transmission signal B is obtained.

The still image receiver m3 converts the speed of the still image sluggish transmission signal B sent out through the transmission line and stores it, and outputs an appropriate background signal only during the period corresponding to the run length code, as well as a digital signal. The still image monitor No. 100C can be used by converting the 7pg signal into a 7pg signal and multiplexing it. and,
The clothes are displayed on the television monitor 4.

Since such a transmission system VC-ex and meaningless background signals are replaced with run-length codes, the amount of transmitter information is reduced and the 1-module efficiency is the same as above.

FIG. 2 shows a graph 2 of a still image transmission device 2 which forms a still image speed-up transmission source B from a control source 1g A.

The operation of this device will be explained below with reference to the waveforms shown in FIG.
The digital code V is output by the digital encoding circuit 2a.
C, f exchanged RB season. As this digital issue 18, PC
M, LIPCIVl, = M temple can be used, and Count Cafu can also be used.

Fixed still image converted to digital signal Digital Shinko H+, c
The recorded signal E of the transmitter/receiver i[flJ control device 5ρ, etc. in FIG.
Therefore, -01 frames are recorded in the recording circuit (memory) 2b and transmitted? ! The still image digital signal ■, which was outputted at an appropriate speed and extended by 0° when the iIl@partner number F was output, is a part of the still image digital signal ■ that is manually input to the p-key circuit 2c to show the background part. The background p-makey signal J and the Ichiji chroma-key signal indicating the significant signal portion are combined. This extraction is easily performed by detecting the head color signal when the background is blue, for example, with respect to the image of the person W.
The signal is input to the run-length encoding circuit 2d and is changed into a code (run-length code) L indicating the scanning line intensity of the background signal.

After that, in the multiplexing/speed conversion circuit 2e, the still image digital signal corresponding to the person's image and the run-length code are multiplexed, and are output every 1" at an appropriate speed. Still image low-speed transmission signal B'
lt is formed and sent to the transmission line.

Figures 4 and 5 show a 1277 diagram and waveform diagrams of the still image receiving device 3, and 3a is a recording circuit that records the still image low-speed transmission signal B% for one 17 units. . This recording side 163a is the transmission/reception control circuit 5 of FIG.
The transmission control signal 'F is read out by the original screen switching control signal G, and a converted digital signal M is formed in which the digital signal of the image M has a predetermined length. One part of this converted digital signal M is inputted to the run-length decoding circuit 3b, and a background signal indicating the scanning line length corresponding to the run-length code is input to the run-length decoding circuit 3b. and generates a significant chroma key signal 0 indicating the scanning line length of the human edge. The background signal P is driven by a background image code generator 3cY to form a background digital signal P, which is sent to a multiplexing circuit 3d and multiplexed with the converted digital signal M(1))ff signal part. .

The background digital signal P may have a lattice pattern, a striped pattern, etc., or only a plain color signal may be used.

The multiplexing circuit 3d decodes the nK silent digital signal H,
In the next digital encoding time Wr 3 e, it is converted into 7 analog signals to form a still image monitor signal Ck.

The control signals (F, G) of the transmission control signal 5 are transmitted when the transmission path is multi-core (
1 pair), +: is multiplexed into still image low-speed transmission signal B,
After adding service and pittons such as frame synchronization, the code is changed back to a code that can be easily extracted for timing, and then sent.

The screen can be updated by inputting the transmission control signal update control signal D'4r, but this signal may also be output dynamically at regular intervals (or an update request made manually on the receiving side). It may also be based on

〔Effect of the invention〕

As explained above, the still image transmission device of the present invention directly replaces the meaningless scanning run-length code that serves as the background part, and multiplexes this with the digital signal of the meaningful image and sends it. In addition to being able to use a weak transmission line, the transmission time can also be shortened by reducing the image information 'It6', which has the effect of Q.

[Brief explanation of the drawing]

Figure 1 <&) is this! A schematic block diagram of t1 light,
Fig. 1 (b) is a waveform diagram for explaining Fig. 1 (,), Fig. 2 is a block diagram showing an example of a still image transmitter, and Fig. 3 is a waveform diagram exactly as explained in Fig. 2. Figure 4 shows still image reception t.
The fifth figure is a waveform diagram for explaining FIG. 4. Uchiko, 1 is a television camera, 2 is a still image transmitting device, 2a is a digital encoding circuit, 2b is a recording circuit, 2c Giris:
+-v-IH-IP! Idl, , 2d is a runf/guess encoding circuit, 2e is a multiplexing/speed conversion circuit, 3 is a still image transmitting device, 3a is a recording circuit, 3b is a full-length V encoding I
! 2 circuits, 3C is on the back! 3d is a multiplexing circuit, and 3e is a digital encoding circuit. Figure 3 Figure 5

Claims (1)

[Claims] Every issue of photographed images? An encoding circuit for converting into a digital signal, a chroma key No. 6 generation circuit for extracting significant images from the photographed image, and the chroma key ↑? The output of the V generation circuit is the number with run length indicating the background part? Generating code length code generation circuit. 3. The digital still image transmission device is characterized in that the image portion of the digital signal and the run-length code are multiplexed and sent out by a speed conversion circuit.3.