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avfilter/palettegen: change cut score from ∑e² to max e²

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This is following the results from personal research¹.

¹: https://github.com/ubitux/research/tree/main/color-quantization#results
This commit is contained in:
Clément Bœsch 2022-12-27 14:48:58 +01:00
parent 187f5e7f90
commit dafd43b78d
3 changed files with 4 additions and 3 deletions
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3
libavfilter/vf_palettegen.c
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@ -171,7 +171,8 @@ static void compute_box_stats(PaletteGenContext *s, struct range_box *box)
if (er2[0] >= er2[1] && er2[0] >= er2[2]) box->major_axis = 0;
if (er2[1] >= er2[0] && er2[1] >= er2[2]) box->major_axis = 1; // prefer green again
box->cut_score = er2[0] + er2[1] + er2[2];
/* The box that has the axis with the biggest error amongst all boxes will but cut down */
box->cut_score = FFMAX3(er2[0], er2[1], er2[2]);
}
/**

2
tests/ref/fate/filter-palettegen-1
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@ -3,4 +3,4 @@
#codec_id 0: rawvideo
#dimensions 0: 16x16
#sar 0: 1/1
0, 0, 0, 1, 1024, 0x394ee723
0, 0, 0, 1, 1024, 0x21c6e6c4

2
tests/ref/fate/filter-palettegen-2
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@ -3,4 +3,4 @@
#codec_id 0: rawvideo
#dimensions 0: 16x16
#sar 0: 1/1
0, 0, 0, 1, 1024, 0xc54d773d
0, 0, 0, 1, 1024, 0x630d76b1