[FFmpeg-trac] #7344(swscale:new): Support invks in resampling filter

FFmpeg trac at avcodec.org
Sun Aug 5 02:02:25 EEST 2018


#7344: Support invks in resampling filter
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             Reporter:  MonoS        |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  wish         |                Component:  swscale
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by MonoS):

 Of course, my apologies for not explaining it before:
 invks means kernel inversion, this is an excerpt from fmtconv
 documentation:

 >Inverting the kernel allows to “undo” a previous upsizing by compensating
 the loss in high frequencies, giving a sharper and more accurate output
 than classic kernels, closer to the original.

 I find it really useful when downscaling to achieve a quick and, in my
 opinion, nice sharp look without messing with other sharpening filter, it
 may introduce some aliasing artifact but i find them better looking than
 the kind of artifact from sharpening filters.
 It may not be the correct solution in term of signal processing, but it
 gave me nice result in the majority of cases in a set and forget manner.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7344#comment:2>
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