SU1102052A1 - Device for coding two-gradation television pictures - Google Patents

Abstract

DEVICE FOR ENCODING binary television images, comprising a camera, a video quantizer, a quantizer ,, clock pulse generator, a counter, first and second decoders, the first and second blocks of coincidence, the first OR gate, the sync code generator and an output register, the first and second outputs of the camera connected to the inputs of the video signal quantizer and: the sync pulse quantizer, respectively, the output of the video signal quantizer is connected to the first inputs of the first and second decoders, the output of the clock quantizer is connected to the first input of the clock pulse generator and to the input of the pulse generator, the output of which is connected to the counter input, the first counter output is connected to the second input of the first decoder, and the second input of the counter is connected to the second input of the second and the first input of the second block of the match, the output of the first decoder is connected to the second inputs of the first block of the match and the clock code generator, the output of the second the decoder is connected to the second input of the second block and to the third input of the clock generator; the first and second inputs of the first OR element are connected to the outputs of the first and second blocks, respectively, and the third input to the first output of the clock code generator, characterized in that , in order to increase coding efficiency by reducing redundant information in the information lines, a census signal generation block, a buffer register and the second element OR, and Em input block formation. The census signal is connected to the output of the video quantizer, and the output is connected to the first input of the buffer D N3 register, the second input of which is connected to the output of the first OR element, and the third input is connected to the output of the sync pulse, the output of the DDS register is connected to the first the input is the second. 0 of the element SchSch, the output of which is connected to the input of the output register, and the second input of the second element OR is connected to the second output of the clock code generator.

Description

1 The invention relates to a technique of television and can be used to encode two-gradation images. A device for encoding two-gradation television images is known, comprising a camera, a video quantizer, the input of which is connected to the output of the camera U. The disadvantage of this device is a large amount of redundant information that is obtained when encoding two-gradation images. The closest technical solution to the invention is a device for encoding two-gradation television images comprising a camera, a video quantizer, a sync pulse quantizer, a pulse generator, a counter, the first and second decoders, the first and second blocks of a match, the first element OR, a code generator of sig-pulses and an output register with the first and second outputs of the camera connected to the inputs of the video signal quantizer and the sync pulse quantizer, respectively, the output of the quantizer in ideo signal is connected to the first inputs of the first and second decoders, the output of the sync pulse quantizer is connected to the first input of the clock code generator and to the input of the pulse generator whose output is connected to the counter input, the first output of the counter is connected to the second input of the first decoder and the first input of the first coincidence unit , the second output of the counter is connected to the second input of the second decoder and with the first input of the second coincidence unit, the output of the first decoder is connected to the second inputs of the first block coinciding the sync pulse generator, the output of the second decoder is connected to the second input of the second coincidence unit and the third input of the clock code generator, the first and second inputs of the first OR element are connected to the outputs of the first and second blocks from the beginning, and the third input V output of the generator zl sync pulse codes. However, the output signal of a known device has a high redundancy. 052 The purpose of the invention is to increase the coding efficiency by shortening. redundant information in the information lines. To achieve this goal, a device for encoding two-gradation television images containing a camera, a video quantizer, a clock quantizer, a pulse generator, a counter, first and second decoders, the first and second blocks of coincidence, the first OR element, the clock code generator and the output register, the first and the second camera outputs are connected to the inputs of the video signal quantizer and the sync pulse generator, respectively, and the output of the video signal quantizer is connected to the first input The first and second decoders, the output of the clock quantizer is connected to the first input of the clock generator and to the input of the pulse generator, the output of which is connected to the counter input, the first output of the counter is connected to the second input of the first coincidence unit, the second output of the counter is connected with the second input of the second decoder and with the first input of the second block of the joint block, the output of the first decoder is connected to the second inputs of the first block of the match and the sync code generator The output of the second decoder is connected to the second input of the second block. and the third input of the sync pulse generator, the first and second inputs of the first IGSh element are connected to the outputs of the first and second matching blocks, respectively, and the third input with the first output of the sync pulse code generator, a census signal generation unit, a buffer register and the second element OR are entered , the input of the census signal generation unit is connected to the output of the video signal quantizer, and the output is connected to the first input: ode of the buffer register, the second input of which is connected to the output of the first element OR, -t ety yield quantizer input clock, the output buffer register connected to the first input of the second OR gate whose output is connected to the input of the output register and the second input of the second OR gate is connected

with the second output of the sync pulse generator.

In the drawing, a structural electrical circuit of the device for encoding two-gradation television images is shown.

A device for encoding two-gradation television images contains a camera 1, a video signal quantizer 2, a quantizer 3 clock pulses, a generator of 4 pulses, a counter 5, first and second, decoders 6 and 7, first and second blocks 8 and 9 coincidence, first element OR 10, buffer register 11, the second element OR 12, the output register 13, the census signal generation unit 14 and the clock pulse generator 15,

A device for encoding two-gradation television images operates as follows.

From camera 1 to the quantizers 2 and 3, respectively, the video signal and clock pulses (SI) are received. D At the beginning of each row, the clock pulse from the output of the quantizer 3 locks the generator of 4 pulses, sets the counter 5 to the initial state, sets the buffer register 11 and starts the generator 15 of the SI codes, which forms the SI code. The SI code through the second element OR 12 is rewritten into the output register 13. Thus, in the code register before the information part, the beginning of the line code combination is recorded. After the termination of the SI, the pulses from the generator 4 are fed to the counter 5, which counts them. In this case, in the buffer register there is an accumulation of code combinations of the empty part of the line or the entire line, if there is no information in it. At the same time, if it is information about the empty part of the line located before the informational part, then at the time of the color change, t, e ,. the arrival of a video signal, it is necessary to fix it. and output to the output register, if this is information about the empty part of the line after the informational line or even about an empty line, then to transfer information about it, it is enough to form the next code combination of the beginning of the line, and the information found in the buffer register, erase.

At the time of the color change. - pulses from the output: the video signal quantizer 2 is transmitted through the decoders 6 and 7 to the second inputs of blocks 8 and 9 of coincidence, the first inputs of which receive information on the state of the bits of the older and lower half of the counter 5. At zero values any half of the counter 5, during the arrival of the signal of the color change of the analyzed areas, it is not polled due to the absence of a pulse at the input of the decoder 6 or 7. During the transmission of information about the low bits of the counter 5 to the first element OR 10 generator Ator 15 SI codes

5 generates the zero value of the high bit of the code word, which is then rewritten into the buffer register 11. When transmitting information about the high half of the counter 5, the generator 15

0 forms the single value of the most significant bit.

When filling all the bits of the counter 5, the decoders 6 and 7 independently generate pulses, and the information is rewritten into the buffer register 11, just as in the previous case.

The information from buffer register 11 is written to output register 13 only when a signal arrives

0 the census to the second input from the census signal generation unit 14 at the beginning and at the end of reading each information item in the line. On the front of the video signal is rewritten.

5, the code combination of the empty part of the string, and by the slice, the informational. Thus, information about the empty part of the string or about a completely empty string in the form of the corresponding code combinations does not enter the output register 13.

With the arrival of the next sync pulse, all information accumulated in the buffer register 11 about the empty line or its post information part is reset by a signal received at its third input from the output of the 3 SI SI quantizer, the SI code generator 15 passes through the second element OR 12

0 into the output register SI code of the next line.

Thus, by eliminating blank lines and parts of lines, redundant information is eliminated and the coding efficiency of two-gradation television images is improved, which distinguishes the proposed device from the known one.

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Claims (1)

DEVICE FOR CODING TWO-GRADING TV IMAGES, comprising a TV camera, a video quantizer, a clock quantizer, a pulse generator, a counter, a first and second decoders, first and second matching blocks, a first OR element, a clock pulse generator and a second output signals and output registers to the inputs of the quantizer of the video signal and: the quantizer of the clock, respectively, the output of the quantizer of the video signal is connected to the first inputs of the first and second _ decryption tori, the output of the clock quantizer is connected to the first input of the clock code generator and to the input of the pulse generator, the output of which is connected to the counter input, the first output of the counter is connected to the second input of the first decoder and to the first input of the first coincidence unit, the second output of the counter is connected to the second input of the second of the decoder and with the first input of the second coincidence unit, the output of the first decoder is connected to the second inputs of the first coincidence unit and the clock generator, the output of the second decoder and connected to the second input of the second coincidence block and to the third input of the clock generator, the first and second inputs of the first OR element are connected to the outputs of the first and second coincidence blocks, and the third input - to the first output of the clock generator, characterized in that, in order to increase the coding efficiency by reducing redundant information in information lines, a census signal generation block, a buffer register, and a second OR element are introduced into it, and the input of the formation block The census signal is connected to the output of the quantizer of the video signal, and the output is connected to the first input of the buffer ι register, the second input of which is connected to the output of the first OR element, and the third input is connected to the output of the quantizer of clock pulses, the output of the buffer register is connected to the first input of the second OR element whose output is connected to the input of the output register, and the second input of the second OR element is connected to the second output of the clock generator.