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authorTakeshi (Kesh) Ikuma <tikuma@hotmail.com>2022-10-01 21:12:59 -0500
committerPaul B Mahol <onemda@gmail.com>2022-10-22 19:35:44 +0200
commit65f96a965af415300f7533c75940eeae4e3a2287 (patch)
treed32ba737188282a0f9f07b899479ffb20da4d115 /libavfilter/dnn/queue.c
parent993e3a6b54552c59bda076d1568ebce69b566545 (diff)
downloadffmpeg-65f96a965af415300f7533c75940eeae4e3a2287.tar.gz
avfilter/vf_curves: add PCHIP interpolator and interp option
summary: This patch modifies the `curves` filter with new `interp` option to let user pick the existing natural cubic spline interpolation and the new PCHIP interapolation. reason: The natural cubic spline does not impose monotonicity between the keypoints. As such, the fitted curve may vary wildly against user's intension. The PCHIP interpolation is not as smooth as the natural spline but guarantees the monotonicity. Providing both options enhances users experience (e.g., reduces the number of keypoints to realize the desired curve). See the related bug report for the example of an ill-interpolated curve. alternate solution: Both Photoshop and GIMP appear to use monotonic interpolation in their curve tools, which were the models for this filter. As such, an alternate solution is to drop the natural spline and go without the `interp` option. related bug report: https://trac.ffmpeg.org/ticket/9947 (filed by myself) Signed-off-by: Takeshi (Kesh) Ikuma <tikuma@hotmail.com>
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