Using Optical Flow to repair corruped frames or remove non-standard film pull-down patterns
Two problems that I see regularly with my projects are single corrupted frames within a longer media file, and irregular patterns of repeated frames. This happens frequently on drone shots or archival footage that has been previously time- or frame-rate converted and needs to be cleanly re-mapped into the current timeline.
Often, both of these problems can be cleanly solved using optical flow retiming tools.
That’s right – optical flow isn’t just for slowing shots down for dramatic effect – it’s also a powerful tool for image repair. In fact, any time you want to create a brand new frame in between two clean frames, optical flow is a great solution.
Key take-aways from this Insight
By then end of this Insight you should understand:
- When you should consider optical flow for image repair
- How to segment out a bad frame and prepare it for optical flow
- Why using render-in-place is important for optical flow (instead of compound clips)
- How to apply the same technique to archival film, removing repeated frames
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