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41. 发明专利

JPS54133035A SHADING REJECTION CIRCUIT 失效
公开(公告)号：JPS54133035A
公开(公告)日：1979-10-16
申请号：JP4032378
申请日：1978-04-07
申请人： HITACHI LTD
发明人： ASAKAWA IWAO , FUJIMOTO KOUJI , OKA MITSUNORI
IPC分类号： G06K9/38 , G06K9/00 , H04N1/401
摘要： PURPOSE:To enable to obtain the every accurate shading waveform, by producing a given function depending on the difference between the input video signal of present scanning and the envelope signal corresponding to the past scanning, and operating the output and the envelope signal. CONSTITUTION:The difference between the video signal of present scanning from the input terminal 21 and the enveloped output of one signal level of the video signal of past scanning is obtained from the subtraction circuit 22, and when the output is less than a given value, the specified value is outputted from the function generator circuit 23. This output signal is fed to the operation circuit 24 to add or multiply with the envelope output of the video signal of past scanning, and the result is taken as the envelope output of one signal level of the video signal of existing scanning, further the output is delayed by one vertical scanning period to obtain the envelope output of video signal of the past scanning. The comparison circuit 28 outputs the video signal removed for shading in response to the video signal of the present scanning from the circuit 24 and the terminal 21. Thus, very accurate shading waveform can be obtained.

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