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Yaowu Xu authored
The commit adds a new set of loop filter for macroblock edge filtering. The new loop filter has a mask to detect so-called "flat" regions. The detection checks 5 pixels of each side of an edge. If the all pixels have value with +/-1 from the edge pixel on the same side, the region is treated as a "flat" region. For such case, a 7 tap filter is used to change 3 pixel values on each side. The 7 taps are: [1, 1, 1, 2, 1, 1, 1]/8 The furthest away pixels used as input are +/-5 away from edge. For non-flat region, we fall back to old filtering. It should be noted here that the thresholds and filter taps may require more optimization for best possible results. Tests on a set of hd clips showed consistent gains: http://www.corp.google.com/~yaowu/no_crawl/mblpf_hd.html (avg psnr: .83% glb psnr: .77% ssim: .82%) Tests on derf set also showed consistent gains: http://www.corp.google.com/~yaowu/no_crawl/mblpf_derf.html (avg psnr: .24% glb psnr: .22% ssim: .48%) Change-Id: I0855b1ff48e79e1175c20b81967137e18b2af352
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