Does any development IDE have a video output tool?
The simulation tool should allow large amounts of video data to be seen in one view. The data could be in different formats with different line/blanking signals. YCrCb color format would also be advantageous. For me right now color isn't an issue.
Simple use would be to click on Video_In and you would see a screen with your video input file, and then write something like this, for example, if Video_In > Threshold then Video_Out