A bad editing detection device is provided to pre-detect a bad editing of image signal, so as to avoid zigzag effect in the television image. When the input image is from a film, instead of from a video source, the line doubler performs a de-interlace for the film signal to increase the vertical resolution...http://www.google.com/patents/US7307670?utm_source=gb-gplus-sharePatent US7307670 - Bad editing detection device
