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Modify trellis parameter defaults

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Modify trellis parameters to optimize for PSNR-HVS by default
This commit is contained in:
Frank Bossen
2014-04-29 14:03:34 -04:00
parent 21b2f11a42
commit 101df25fde
2 changed files with 5 additions and 4 deletions
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4
cjpeg.c
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@@ -487,8 +487,8 @@ parse_switches (j_compress_ptr cinfo, int argc, char **argv,
} else if (keymatch(arg, "tune-hvs-psnr", 6)) {
cinfo->use_flat_quant_tbl = FALSE;
cinfo->lambda_log_scale1 = 15.0;
cinfo->lambda_log_scale2 = 14.5;
cinfo->lambda_log_scale1 = 16.0;
cinfo->lambda_log_scale2 = 15.5;
cinfo->use_lambda_weight_tbl = TRUE;
jpeg_set_quality(cinfo, 75, TRUE);

5
jcparam.c
View File

@@ -427,9 +427,10 @@ jpeg_set_defaults (j_compress_ptr cinfo)
#endif
cinfo->trellis_quant = (cinfo->use_moz_defaults != 0) ? TRUE : FALSE;
cinfo->lambda_log_scale1 = 17.0;
cinfo->lambda_log_scale2 = 15.0;
cinfo->lambda_log_scale1 = 16.0;
cinfo->lambda_log_scale2 = 15.5;
cinfo->use_lambda_weight_tbl = TRUE;
cinfo->use_scans_in_trellis = FALSE;
cinfo->trellis_freq_split = 8;
cinfo->trellis_num_loops = 1;