High Quality Hdr Video Compression Using Hevc Main 10 Profile
2016 PICTURE CODING SYMPOSIUM (PCS)(2016)
摘要
This paper describes high-quality compression of high dynamic range (HDR) video using existing tools such as the HEVC Main 10 profile, the SMPTE ST 2084 (PQ) transfer function, and the BT.2020 non-constant luminance Y'CbCr color representation. First, we present novel mathematical bounds that reduce complexity of luminance-preserving subsampling (luma adjustment). A nested look-up table allows for further speedup. Second, an adaptive QP scheme is presented that obtains a better bit allocation balance between dark and bright areas of the picture. Third, a method to control the bit allocation balance between chroma and luma by adjusting the chroma QP offset is presented. The result is a considerable increase in perceptual quality compared to the anchors used in the 2015 MPEG High Dynamic Range/Wide Color Gamut Call for Evidence. All techniques are encoder-side-only, making them compatible with a regular decoder capable of supporting HEVC Main10/PQ/BT.2020, which is already available in some TV sets on the market.
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关键词
mathematical bounds,complexity reduction,luminance-preserving subsampling,nested look-up table,adaptive QP scheme,bit allocation balance control,chroma QP offset adjustment,perceptual quality,HEVC Main10/PQ/BT.2020,BT.2020 nonconstant luminance Y'CbCr color representation,SMPTE ST 2084 transfer function,high dynamic range video,HEVC Main 10 profile,high quality HDR video compression
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