SU745018A1 - Device for coding colour television signals - Google Patents

Description

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Ieteen relates to radio engineering and can be used to convert analog signals to color. TV sensor to digital .code. . ..

A coding device for color television signals is known, which contains a color television signal sensor, three outputs of which are connected to the corresponding inputs of a color separated adder, and a fourth output is connected to an input of a control unit, and the corresponding two outputs of a color television signal sensor are connected to the corresponding two discrete matrix inputs filters, the third inlet of which is connected, is dinene with the output of the color separation adder of the image signals, while the informational signals Oda matrix of discrete filters connected to the inputs of the decoder, and one output register.

However, the known device does not provide sufficient chromaticity resolution when encoding images that differ in color content.

The purpose of the invention is to increase the resolution in color by adaptive coding of the color diagram.

For this purpose, a color television signal coding device comprising a color television signal sensor, the three outputs of which are connected to the corresponding inputs of a color-separated adder. image signals, and the fourth output is connected to the input of the control unit, with the corresponding

Two outputs of the color television signal sensor are connected to the corresponding two inputs of the matrix of discrete filters, the third input of which is connected to the output of the Color Separator of image signals,

20 wherein the information outputs of the matrix of discrete filters are connected to the inputs of the decoder, and the output register is entered in the registration unit

25 color histograms and a controllable coding block, the controllable coding block being connected between the outputs of the decoder and the inputs of the output register, and the recording unit of the chromaticity histograms being connected between

745018

the output of the control unit and the auxiliary outputs of the matrix, discrete filters, and the output unit of the chromaticity histograms are connected to the control input of the controlled coding unit, and the unit for recording the chromaticity histograms contains a digital logic circuit, a counting pulse generator, and a scaling code register and a matrix of memory cells, each one of which consists of series-connected three-loop matching schemes, a counter

color threshold, the threshold decoder and the scale counter, while the outputs of each of the cells are connected to the first inputs of the digital logic circuit, the output of which is connected to the register input of the scale code, and the output of the counting pulse generator is connected to the same inputs of the memory cells, the output of the control unit is connected to the input of the generator of counting pulses, and the additional outputs of the matrix of discrete filters are connected to the inputs of the memory cells and to the second inputs of a digital logic circuit.

FIG. Figure 1 shows the structural electrical circuit of the proposed device; in fig. 2 is a diagram of a memory cell type.

The color television signal coding device contains a sensor of 1 color television signals, an adder 2 color-separated image signals, a matrix of 3 discrete color filters, a decoder 4 controlled by a coding switch 5, an output register b, a block 7 for recording histogram color, containing a matrix of Ps1m cells 8, each consisting of a three-input circuit 9 matches, a counter 10, a color area, a threshold decoder 11 and a scale counter 12, a digital logic circuit 13, a register 14 of a scale code and a generator 15 tnyh pulses, as well as block 16 control.

The device works as follows

Color separation of video signals and ", UZ, Uj. sensor 1 are summed up in adder 2. The video 3 receives the video signal: the loads UK and UgC of sensor 1, as well as the sum signal U from the adder 2.

In the decoder 4 is the formation of a binary code. This code, using operative truncation, the degree of which is determined by analyzing the chromaticity histogram, is rewritten using controlled coding block 5 to the output register b and used by the second one (for example, or for transmission over a digital communication channel).

in block 16, synchronized by sensor 1 signals, control signals are generated for block 7, block 7 contains a matrix of memory cells 8, the functional purpose of which is: digital recording of color areas S., for each of the square areas of the color chart, the maximum quantization step in three-way circuits 9 and counters 10, comparing these areas with a wave with digital threshold values S,, max threshold decoders 11 and fixing the binary scaling code in scale counters 12. and the result n The operations listed in each of the scale counters 12 contain a binary code reflecting the intensity of the corresponding bit of a chromatic histogram, or, equivalently, the relative content of elements of a given chromaticity in the original image. Information from scale counters 12 in coding mode using digital logic circuit 13 is sequentially presented in register 14. To register color areas, an oscillator 15 is used, connected to the inputs of counters 10. As a result of constructing the chromaticity histogram, scale meters 12 accumulate and store information use to generate code in output register b. When scanning image elements of rarely occurring chromaticities (§1 t) & Register 14 generates a two-digit binary code o, o, in accordance with this code in the controlled coding block 5 signals are generated that prohibit the transfer of digital information from the decoder 4 to the output register B, and in all the last bits of the latter, zero potentials are set — information, is not transmitted. When scanning elements of the most frequently occurring chromaticities (S-, in register 14. binary code 1.1 is generated, in accordance with which the selectable coding unit 5 is set to full information transfer mode from d encoder 4 to the output register B - coding mode is implemented, with the maximum resolution.

At the moments of scanning elements of other chromaticities, when the scale codes are equal to O.lV (3 ", S.) or 1.0 (Si), when transferring digital information to output register 6, the truncation operation is used by four and two lower bits, respectively. .

The use of the proposed television device for digital coding of color images allows the implementation of an automatic adaptive coding mode and ensures the matching of the resolution in color with the color content of the image.

Claims (2)

1. A coding device for color television signals containing a color television signal sensor, three outputs of which are connected to corresponding inputs of a color-separated adder from razra, and a fourth output is connected to an input of a control unit, and the corresponding two outputs of a color television signal sensor are connected to the corresponding two: h inputs of the matrix of discrete filters, the third input of which is connected to the output of the adder of color-separated image signals, while the information outputs of the matrix s digital filters are connected to inputs of the decoder, and output register characterized in that, in order to increase the resolution of chroma coding by adaptive color chart introduced registration unit chromaticity histograms and controlled by the encoding unit, the controllable unit kodirutoschyy included between outputs. by the inputs of the decoder and the inputs of the output register, and the registration unit chromaticity histograms are connected between the output of the control unit and additional outputs of the matrix of discrete filters, and the output of the chromaticity histogram recording unit is connected to the control input of the controlled coding unit, 2. A color television signal coding device according to claim 1, characterized in that the chrominance histogram recording unit comprises a digital logic circuit, a counting pulse generator, a scaling code re-source and a memory cell matrix / each of which sucks from sequential three-input coincidence circuits a color space counter, a threshold decoder and a scaling counter; the outputs of each of the memory cells are connected to the first inputs of the digital logic circuit, the output of which is connected to the input of the scale register code output, and the output of the generator of counting pulses is connected to the same inputs of the memory cells, the output of the control unit is connected to the input of the generator of counting pulses, and the additional outputs of the matrix of discrete filters are connected to the inputs of the memory cells and the second inputs of a digital logic circuit. Sources of information taken into account in the examination 1, USSR Copyright Certificate W 510810, cl. H 04 N 7/02, 1976 (prototype).