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一、引言自从广播电视应用以来,提高电视图象清晰度方面的工作多数是致力于改进图象信号处理电路,例如进行各种频率补偿,扩大视频信号带宽,补偿轮廓,采用末级推挽视放,提高视频信号频响,直至近年来开发的高清晰度电视等等.但是,电视重影已成为一个严重的问题.最近文字广播的实用化,使解决重影问题已变成刻不容缓.因为重影不仅会使文字显示变得模
I. INTRODUCTION Since the application of radio and television, the work of improving the definition of television images has mostly been devoted to improving the image signal processing circuits, for example, performing various frequency compensation, expanding the bandwidth of video signals and compensating the contour, adopting the final push-pull vision , Increasing the frequency of video signals, developing HDTVs in recent years, etc. However, video ghosting has become a serious problem, and the recent practical application of text broadcasting has made it extremely urgent to solve the problem of ghosting Ghosting will not only make the text display modulo