tree 39c55a0632a028dbd95a040827aafb43e7354da7
parent ad5165dd84303b9df8ff293432567808a5020176
author Sai Deng <sdeng@google.com> 1613429268 -0800
committer Sai Deng <sdeng@google.com> 1614107266 +0000

Tune the MSE/Butteraugli model

The model was adjusted based on the collected data compressed at
different QP levels. Big improvements on the test files with loss
previously. Currently only 2 out of 250+ test images report Butteraugli
BD-rate loss.

BD-rate reduction with baseline tune=psnr:

Google HDR+ 153 images JPG test set
psnr    ssim     butteraugli
5.652%  -3.177%  -19.881%

Kodak 24 images PNG test set
psnr    ssim     butteraugli
3.088%  -1.620%  -15.013%

Note: Results are based on Butteraugli from JPEGXL v0.3

BUG=aomedia:2965

Change-Id: Ibefbb5aa5289a824962425d716670e535af0b26b