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VREP Graph

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dlandes edited this page Dec 7, 2014 · 3 revisions

Filter Domain: Vertical Repetitions

Filter Name(s): VREP

Values: 0.00-1.00

Vertical Line Repetitions, or the VREP filter, is useful in analyzing U-Matic tapes and detecting artifacts generated in the course of the digitization process. Specifically, VREP detects the repetition of lines in a video. If a time base corrector notices a video signal dropout, it will compensate by playing the same line of data several times, hence the appearance of repetitious lines.The filter works by taking a given video line and comparing it against a video line that occurs 4 pixels earlier. If the difference in the two is less than 512, the filter reads them as being close enough to be appear repetitious. Cleaning your deck and/or tape may remediate this problem.

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