UM:Dvo Effects Dvo Line Sync

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DVO Line Sync



Line sync or line jitter is a very common problem with archived analog video tape.


It is typically caused by the lack of (or disturbances with) line synchronization pulses which prevents the the video tape recorder from locating the actual start and end of each line. This causes random line displacement (jitter).


The most visible effect is that vertical edges appear to be jagged. The jitter can range from +/-1 pixel to more than +/-5 pixels in severe cases. DVO Line Sync automatically detects and corrects these line displacements as well as any stretching it causes.





When enabled, DVO Line Sync will process the input as per the settings described below.

Detection Strength



Detection Strength controls the degree of jitter detection with a higher number meaning a higher degree of detection.



If the Strength parameter is pushed too high, we may correct lines unnecessarily and introduce jitter. Analyse the resulting output before committing to a long render.



Note that the processing time is dependent on detected (and processed) lines. The more line sync issues we find, the longer it will take to process.




Enables correction of pixel shifting (left/right)


Enables correction of stretched/shrunken lines.

Noise Reduction



This is Adaptive Noise Reduction with non-recursive spatio-temporal filtering so ghosting will not occur.



Note that processing time will be considerably higher when active since all lines have to be processed.

NR Enable

Enables Noise Reduction, independent of shift/stretch detection and correction.

NR Strength

Sets the amount of Noise Reduction to perform.


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