[FFmpeg-devel] rectification filter

Daniel Oberhoff danieloberhoff at gmail.com
Sun Aug 10 20:36:37 CEST 2014

Von meinem iPhone gesendet

> Am 10.08.2014 um 17:50 schrieb Michael Niedermayer <michaelni at gmx.at>:
>> On Sun, Aug 10, 2014 at 03:36:04PM +0200, Nicolas George wrote:
>> Le tridi 23 thermidor, an CCXXII, Paul B Mahol a écrit :
>>> It is not mandatory(but it would be nice) to add other methods to have
>>> this filter included into libavfilter.
>> Is it really a good idea? We would end up with various interpolation /
>> anti-aliasing algorithms implemented in each filter that needs it, none of
>> them with the same set of architecture optimizations and each with its own
>> set of bugs and misfeatures.
>> Until someone comes up with a really satisfactory solution, I believe the
>> simple solution of suggesting users to upscale before the filter and
>> downscale after, using the optimized lswr scalers, is better.
> thats not practical
> a 1024x768 image would need to be upscaled to 262144x196608 to get
> 8bit precission from a nearest neighbor resampler as basis
> also see vf_perspective.c which supports bilinear and bicubic
> interpolation, these surely could be shared and exist already.
> of course we could push it with just nearest neighbor and work on that
> later, but i dont think only nearest neighbor and leaving it at that
> is a reasonable choice, its too poor quality wise

I would like to push now, and try to generate a refactoring patch possibly within the week. 

> [...]
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