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webmproject / sjpeg

SimpleJPEG: simple jpeg encoder
Apache License 2.0
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Optimize ComputePSNR() #31

Closed skal65535 closed 6 years ago

skal65535 commented 6 years ago

we don't need to do the full quantize/run_level coding. We just need to evaluate the quantization error in one call.

-> between 30% and 2x faster option -psnr.

Change-Id: I15c004bce12d17d64ae82029598d4a8991f0e7e9