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georgmartius / vid.stab

Video stabilization library
http://public.hronopik.de/vid.stab/
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Possible to add Lanczos, Spline36, and Spline64 to "interpol"? #73

Open BlohoJo opened 5 years ago

BlohoJo commented 5 years ago

Current options are limited to none, linear, bilinear, and bicubic.

georgmartius commented 5 years ago

I doubt that the interpolation strategy is really the limiting factor, but in principle it should be possible to do. I don't have time to do it.

hedgepigdaniel commented 5 years ago

@georgmartius when you say it isn't the limiting factor, what exactly do you mean?

I have found that the vidstabtransform filter introduces visible artefacts (I would describe it as aliasing). Choosing the bicubic interpolation improves it, but it is still noticeable compared to the original. Hence I suspect that a better interpolation algorithm would further reduce the quality loss.

Are there other potential culprits?

georgmartius commented 5 years ago

Sure, improving the interpolation can reduce the artifacts. My videos were always very shaky, so there was more motion blur etc. than aliasing. (I meant compensating rolling shutter and lens distortions will improve quality more)