Colour space transforms for improved video compression
Systems, Signals and Image Processing（2014）
摘要
The Version 1 of the latest video coding standard High Efficiency Video Coding (HEVC) supports 4:2:0 colour sampling and colour representation that includes a luminance and two chrominance colour bands. To enable efficient coding of content with 4:4:4 sampling format and RGB colour space some improvements to the coding pipeline are needed. This paper investigates methods for converting RGB colour space into a luminance and two chrominance colour space suitable for HEVC encoding. Four colour transform domains, namely, YCbCr, YCoCg, Karhunen-Loève Transform (KLT) and 3-point Pseudo Discrete Cosine Transform (P-DCT), are investigated for converting RGB into a colour space usable in HEVC range extension test model. One of the proposed approximations of KLT transform matrices results in overall highest BD-rate savings and BD-PSNR improvements.
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关键词
karhunen-loeve transforms,data compression,discrete cosine transforms,image colour analysis,image representation,image sampling,video coding,3-point pseudo discrete cosine transform,bd-psnr,bd-rate savings,hevc encoding,kl transform matrices,karhunen-loeve transform,p-dct,rgb colour space,ycbcr,ycocg,chrominance colour bands,chrominance colour space,coding pipeline,colour representation,colour sampling,colour space transforms,colour transform domains,high efficiency video coding,luminance,video coding standard,video compression,dct,hevc,klt,lifting,screen content,color,karhunen loeve transform
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