Baker & Hostetler LLP
Deblocking filter for high dynamic range (HDR) video
Methods of in-loop deblocking filter for high dynamic range (HDR) video compression are disclosed. HDR processing and standard dynamic range (SDR) processing adopt different electro-optical transfer function (EOTF) to convert digital code words to linear luminance. For compressing HDR video, EOTF is proposed to be involved in the selection of two deblocking parameters, β and tC, which control the strength of deblocking filter. In local activity checking for filter decisions, the calculated local signal characteristics and the thresholds are adjusted according to EOTF. After deblocking filter, the clipping range is modified based on EOTF. The chroma deblocking filter is also extended to inter-inter block boundary.
Apple Inc.
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Jun Chris Y. Jingteng Mei Yeping Xiaosong Hsi-Jung Feng Jun
Xin Chung Xue Guo Su Zhou Wu Yi Xu