发明授权
- 专利标题: Video bit transition advancement circuit
- 专利标题(中): 视频位转换提升电路
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申请号: US826692申请日: 1986-02-06
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公开(公告)号: US4734691A公开(公告)日: 1988-03-29
- 发明人: Geoffrey A. Bailey , Milan H. Miessler
- 申请人: Geoffrey A. Bailey , Milan H. Miessler
- 申请人地址: NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: NY Armonk
- 优先权: EPX85301482.7 19850304
- 主分类号: G09G1/16
- IPC分类号: G09G1/16 ; G09G1/00 ; G09G1/28 ; G09G5/00 ; G09G5/02
摘要:
In order to compensate for image distortion introduced into a digitally controlled raster-scan CRT by the finite video amplifier rise and fall times, the digital video drive waveform is subjected to selective pulse stretching to extend the duration of each pel which is immediately preceded by a pel of lower light intensity value (brightness). This is achieved by means of a comparator (14) which examines each current pel PEL(N) in the video data stream in relation to its immediately preceding neighbor PEL(N-1) in order to detect pel boundary transition therebetween representing an increase in brightness from the preceding pel to the current pel. Re-timing means (17, 19, 21, 22) is operably under control of the comparator output to cause advancement in time by a predetermined amount (dt) of any such pel boundary transition relative to remaining pel boundary transitions.
公开/授权文献
- US4116744A Control apparatus for a tire building machine 公开/授权日:1978-09-26