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Add new quantization tables

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New quantization tables tuned for PSNR-HVS are added.
Per-coefficient lambda weights are now derived based on the
quantization table entries.
This commit is contained in:
Frank Bossen
2014-09-30 10:24:52 -04:00
parent 41ebea736d
commit 83d6a8e643
4 changed files with 144 additions and 15 deletions
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18
cjpeg.c
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@@ -508,29 +508,29 @@ parse_switches (j_compress_ptr cinfo, int argc, char **argv,
} else if (keymatch(arg, "tune-psnr", 6)) {
cinfo->quant_tbl_master_idx = 1;
cinfo->lambda_log_scale1 = 9.0;
cinfo->lambda_log_scale1 = 9.25;
cinfo->lambda_log_scale2 = 0.0;
cinfo->use_lambda_weight_tbl = FALSE;
jpeg_set_quality(cinfo, 75, TRUE);
} else if (keymatch(arg, "tune-ssim", 6)) {
cinfo->quant_tbl_master_idx = 1;
cinfo->lambda_log_scale1 = 12.0;
cinfo->lambda_log_scale2 = 13.5;
cinfo->lambda_log_scale1 = 11.25;
cinfo->lambda_log_scale2 = 12.75;
cinfo->use_lambda_weight_tbl = FALSE;
jpeg_set_quality(cinfo, 75, TRUE);
} else if (keymatch(arg, "tune-ms-ssim", 6)) {
cinfo->quant_tbl_master_idx = 0;
cinfo->lambda_log_scale1 = 14.25;
cinfo->lambda_log_scale2 = 12.75;
cinfo->quant_tbl_master_idx = 2;
cinfo->lambda_log_scale1 = 12.25;
cinfo->lambda_log_scale2 = 13.25;
cinfo->use_lambda_weight_tbl = TRUE;
jpeg_set_quality(cinfo, 75, TRUE);
} else if (keymatch(arg, "tune-hvs-psnr", 6)) {
cinfo->quant_tbl_master_idx = 0;
cinfo->lambda_log_scale1 = 16.0;
cinfo->lambda_log_scale2 = 15.5;
cinfo->quant_tbl_master_idx = 4;
cinfo->lambda_log_scale1 = 13.75;
cinfo->lambda_log_scale2 = 15.25;
cinfo->use_lambda_weight_tbl = TRUE;
jpeg_set_quality(cinfo, 75, TRUE);