SU1417211A1 - Method of shaping an image for visual check of video signal conversion systems - Google Patents

Abstract

The invention relates to a television technique. The purpose of the invention is to simplify the method by reducing the volume of the amplified converted video signal. The device for implementing the method comprises an ADC 1, a RAM block 2, a control block 3, a DAC 4, a switch (K) 5, a video control block (WKB) 6, a synchronous generator 7, an electronic computing computer (COMPUTER) 8. The device operates in the “Record and“ Control. In the Recording mode, the current video signal of the reference image, for example, a television test pattern (TIT) input to the A / D converter 1, is converted into a digital code that is recorded in the computer memory 8. For a certain number of frames in the computer memory, the full frame of the IT image is recorded . In the Monitoring mode, the analog signal of the full frame of the current image is fed to the first input K 5, the second input of which receives the video signal of a fragment of the recorded TIT image. The screen of WKB 6 displays the full frame of the image of the TIT, one of the fragments of which in the current frame is replaced by a fragment of the image recorded in the computer memory 8. The location of the fragment is marked by a marker. The presence of violations. The geometry of the TIT figures or the change in luminance during the substitution of image areas indicate defects in the conversion, recording and reading of the video signal. 1 il. se (L

Description

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The invention relates to television engineering and can be used in the visual control of video signal conversion systems, in particular, systems performing analog-to-digital conversion of video signals, their storage and digital-analog conversion.

The purpose of the invention is to simplify the method by reducing the amount of memorized converted video signal.

The drawing shows an electrical block diagram of an apparatus for implementing an imaging method for visually controlling video signal conversion systems.

The device contains an analog-to-digital converter (ADC) 1, a RAM block 2, a control block 3, a digital-to-analog converter (DAC) 4, a switch 5, a video monitor block (VKB) 6, a clock generator 7, an electronic computer (PC) eight.

An imaging device for visually controlling video signal conversion systems operates as follows.

The device operates in the “Record and“ Control.

In the Recording mode, the current video signal of the reference image, for example, a television test pattern, inputted to the A / D converter 1, is converted into a digital code, which is recorded in the RAM block 2 and is overwritten from it into the computer memory 8. In this case, the information capacity of the block 2 is selected significantly lower information capacity of the telegraphic frame. Therefore, during the time of one frame in block 2, one fragment of the image is recorded that makes up n lines of the frame.

For a certain number of frames in the computer memory, the full frame of the television test pattern image is recorded. The necessary sync signals come from block 3. The current image is

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cut switch 5 enters the video monitoring unit 6.

In the Monitoring mode, the analog signal of the full frame of the current image is fed to the first input of the switch 5, the second input of which from the computer memory 8 through block 2 after digital-to-analog conversion to the DAC 4 receives the video signal of a fragment of the recorded image of the test table.

Thus, the screen of the WKB 6 displays the full frame of the image of the test table, one of the fragments of which in the current frame is replaced by a fragment of the image recorded in the memory

g computer 6. The location of the fragment is marked with a marker. Possible defects in the conversion, recording and reading of a video signal in the system become easily noticeable at the boundaries of the output fragment and the current image due to violations of the geometry of the figures in the test table or changes in brightness.

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Claims (1)

Invention Formula An imaging method for visual control of video signal conversion systems based on generating a current video signal of a reference image, forwarding and reverse converting it in a controlled video signal conversion system, storing the converted video signal and playing the current and converted video signals of a reference image on a video control unit, differing from that, in order to simplify the way by reducing the amount of the memorized converted video signal, remember n (, 2, ...) lines of the converted video signal and during playback move them on the screen of the video control unit, while on the screen of the video control unit produces m-n lines of the current video signal of the reference image, where w is the number of lines in the image frame.