| 摘要 |
<p>A video signal processing technique for detection and correction of the video signal from a bad video channel is disclosed for use with a video imaging system having a plurality of video channels for providing a video signal for a plurality of video scan lines. A disclosed embodiment is a bad channel detection and correction circuit (10) which includes circuitry (11, 13) responsive to a video signal for providing a difference signal indicative of the difference between a first scan line video signal and a second scan line video signal; a first histogram circuit (20, 60) responsive to the difference signal for generating difference histogram data indicative of the number of occurences of different values of the difference signal; a second histogram circuit (30, 60) responsive to the first scan line video signal for providing video histogram data indicative of the number of occurences of different values of the first scan line video signal; means for analyzing the difference histogram data and the video histogram data for providing a decision output indicative of whether the second scan line video signal is from a bad video channel (40, 29, 31, 70); and output circuitry (15, 17, 19, 21, 23, 25, 27) responsive to the analyzing means for providing a delayed output signal corresponding to (a) the second scan line video signal when the decision output indicates both lines are from good video channels, or (b) a substituted value for the second scan line video signal when the decision output signal indicates that the second scan line video signal is from a bad channel.</p> |
