IEEE Trans Image Process - Advanced screen content coding using color table and index map.

Tópicos

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Resumo

This paper presents an advanced screen content coding solution using color table and index map (cTIM) method. This cTIM scheme is implemented in the range extensions of high-efficiency video coding (HEVC-RExt) as an additional tool of intracoding to complement conventional spatial angular prediction to better exploit the screen content redundancy. For each coding unit, a number of major colors will be selected to form the color table, then the original pixel block is translated to the corresponding index map. A 1D or hybrid 1D/2D string match scheme is introduced to derive matched pairs of index map for better compression. Leveraging the color distribution similarity between neighboring image blocks, color table merge is developed to carry it implicitly. For those blocks that color table has to be signaled explicitly, intertable color sharing and intratable color differential predictive coding are applied to reduce the signaling overhead. Extensive experiments have been performed and they have demonstrated the significant coding efficiency improvement over conventional HEVC-RExt, resulting in 26%, 18%, and 15% bit rate reduction at lossless case and 23%, 19%, and 13% Bjontegaard Delta-rate improvement at lossy scenario of typical screen content with text and graphics, for respective all intra, random access, and low-delay using B picture encoder settings. Detailed performance study and complexity analysis (as well as the comparison with other algorithms) have been included as well to evidence the efficiency of proposed algorithm.

Resumo Limpo

paper present advanc screen content code solut use color tabl index map ctim method ctim scheme implement rang extens higheffici video code hevcrext addit tool intracod complement convent spatial angular predict better exploit screen content redund code unit number major color will select form color tabl origin pixel block translat correspond index map d hybrid dd string match scheme introduc deriv match pair index map better compress leverag color distribut similar neighbor imag block color tabl merg develop carri implicit block color tabl signal explicit intert color share intrat color differenti predict code appli reduc signal overhead extens experi perform demonstr signific code effici improv convent hevcrext result bit rate reduct lossless case bjontegaard deltar improv lossi scenario typic screen content text graphic respect intra random access lowdelay use b pictur encod set detail perform studi complex analysi well comparison algorithm includ well evid effici propos algorithm

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