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filter_kernels: refine ewa_lanczossharp/soft constants

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Replaced by mathematically and numerically precise constants, the result
of exact computation. Also updates the description to provide more
explanation and motivation.
This commit is contained in:
Niklas Haas 2023-09-16 13:25:28 +02:00 committed by Niklas Haas
parent 2ec79f8bb7
commit 93ff7554ac
1 changed files with 6 additions and 6 deletions
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12
video/out/filter_kernels.c
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@ -378,13 +378,13 @@ const struct filter_kernel mp_filter_kernels[] = {
{{"ewa_lanczos", JINC_R3, jinc, .resizable = true}, .polar = true, .window = "jinc"},
{{"ewa_hanning", JINC_R3, jinc, .resizable = true}, .polar = true, .window = "hanning" },
{{"ewa_ginseng", JINC_R3, jinc, .resizable = true}, .polar = true, .window = "sinc"},
// Radius is based on the true jinc radius, slightly sharpened as per
// calculations by Nicolas Robidoux. Source: Imagemagick's magick/resize.c
{{"ewa_lanczossharp", JINC_R3, jinc, .blur = 0.9812505644269356, .resizable = true},
// Slightly sharpened to minimize the 1D step response error (to better
// preserve horizontal/vertical lines)
{{"ewa_lanczossharp", JINC_R3, jinc, .blur = 0.9812505837223707, .resizable = true},
.polar = true, .window = "jinc"},
// Similar to the above, but softened instead. This one makes hash patterns
// disappear completely. Blur determined by trial and error.
{{"ewa_lanczossoft", JINC_R3, jinc, .blur = 1.015, .resizable = true},
// Similar to the above, but softened instead, to make even/odd integer
// contributions exactly symmetrical. Designed to smooth out hash patterns.
{{"ewa_lanczossoft", JINC_R3, jinc, .blur = 1.0164667662867047, .resizable = true},
.polar = true, .window = "jinc"},
// Very soft (blurred) hanning-windowed jinc; removes almost all aliasing.
// Blur parameter picked to match orthogonal and diagonal contributions