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d5e498d47f
Don't combine the Histograms that have trivial (single valued A, R & B)
symbols.
Following is the compression savings data along with compression time (before
& after) per image.
Before After
bpp, rate(MP/s) bpp, rate(MP/s)
Q=25, method = 4 2.508, 1.807 2.499, 1.916
Q=50, method = 4 2.460, 1.488 2.456, 1.512
Q=75, method = 4 2.452, 1.078 2.450, 1.092
Q=25, method = 5 2.505, 1.398 2.496, 1.383
Q=50, method = 5 2.458, 1.170 2.453, 1.143
Q=75, method = 5 2.453, 0.886 2.450, 0.855
This change provides 0.1-0.4% compression gains and speeds up the lossless
compression for the default method=4 (the drop in compression speed is between 1-3.5% for method=5).
Change-Id: Idfd88c2092f37afacd26a97097b3053f8183953a
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| .. | ||
| alpha.c | ||
| analysis.c | ||
| backward_references.c | ||
| backward_references.h | ||
| config.c | ||
| cost.c | ||
| cost.h | ||
| filter.c | ||
| frame.c | ||
| histogram.c | ||
| histogram.h | ||
| iterator.c | ||
| Makefile.am | ||
| near_lossless.c | ||
| picture_csp.c | ||
| picture_psnr.c | ||
| picture_rescale.c | ||
| picture_tools.c | ||
| picture.c | ||
| quant.c | ||
| syntax.c | ||
| token.c | ||
| tree.c | ||
| vp8enci.h | ||
| vp8l.c | ||
| vp8li.h | ||
| webpenc.c | ||