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Pseudo 2D String Matching Technique for High Efficiency Screen Content Coding

机译:用于高效屏幕内容编码的伪2D字符串匹配技术

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摘要

This paper proposes a pseudo 2D string matching (P2SM) technique for high efficiency screen content coding (SCC). The technique uses a primary reference buffer (PRB) and a secondary reference buffer (SRB) for string matching and string copying. In the encoder, optimal reference string searching is performed in both PRB and SRB, and either a PRB or an SRB string is selected as an optimal reference string on a string-by-string basis. If no reference string of at least one pixel is founded for a current pixel, then the current pixel is coded as an unmatched pixel. Compared with HM-16.4SCM-4.0 reference software, the proposed P2SM technique achieves up to 37.7% Y BD-rate reduction for a screen snapshot of a spreadsheet. On average, using HEVC SCC common test condition and YUV test sequences in text and graphics with motion category, the proposed technique achieves Y BD-rate reduction of 7.7%, 5.0%, 2.6% for all intra (AI), random access (RA) and low-delay B (LB) configurations, respectively in lossy coding with both intra block copy (IBC) and P2SM having the same 4 coding tree units (CTUs) searching range, and bit-rate saving of 6.0%, 3.9%, 3.1% for AI, RA, LB configurations, respectively in lossless coding with IBC having full frame searching range while P2SM having only 2 CTUs searching range, at very low additional encoding and decoding complexity.
机译:本文提出了一种用于高效屏幕内容编码(SCC)的伪2D字符串匹配(P2SM)技术。该技术使用主参考缓冲区(PRB)和辅助参考缓冲区(SRB)进行字符串匹配和字符串复制。在编码器中,在PRB和SRB中都执行最佳参考字符串搜索,并且在逐个字符串的基础上选择PRB或SRB字符串作为最佳参考字符串。如果没有为当前像素建立至少一个像素的参考字符串,则将当前像素编码为不匹配的像素。与HM-16.4SCM-4.0参考软件相比,针对电子表格的屏幕快照,所提出的P2SM技术可将Y BD率降低多达37.7%。平均而言,通过使用HEVC SCC通用测试条件和带有运动类别的文本和图形中的YUV测试序列,所提出的技术对所有内部(AI),随机访问(RA)的Y BD速率降低了7.7%,5.0%,2.6% )和低延迟B(LB)配置,分别采用内部块复制(IBC)和P2SM具有相同的4个编码树单元(CTU)搜索范围的有损编码,并且节省了6.0%,3.9%的比特率,对于AI,RA和LB配置,分别在IBC具有全帧搜索范围而P2SM仅具有2个CTU搜索范围的无损编码中,分别具有3.1%的配置,且编码和解码的复杂度非常低。

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