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

Pseudo 2D String Matching Technique for High Efficiency Screen Content Coding
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用于高效屏幕内容编码的伪2D字符串匹配技术

DOI:
10.1109/tmm.2015.2512539
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发表时间:
2016-03
影响因子:
7.3
通讯作者:
Chen, Xianyi
Chen, Xianyi
中科院分区:
计算机科学1区
文献类型:
--
作者:
Lin, Tao;Zhou, Kailun;Wang, Shuhui;Chen, Xianyi

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本文提出了一种伪二维字符串匹配(P2 SM)技术,用于高效的屏幕内容编码(SCC)。该技术使用主参考缓冲器(PRB)和辅助参考缓冲器(SRB)进行字符串匹配和字符串复制。在编码器中,在PRB和SRB两者中执行最佳参考串搜索,并且在逐串的基础上选择PRB或SRB串作为最佳参考串。如果对于当前像素没有找到至少一个像素的参考串,则当前像素被编码为不匹配像素。与HM-16.4${+}$SCM-4.0参考软件相比,所提出的P2 SM技术对于电子表格的屏幕快照实现了高达37.7%的Y BD速率降低。平均而言,在具有运动类别的文本和图形中使用HEVC SCC公共测试条件和YUV测试序列,所提出的技术对于所有帧内(AI)、随机访问(RA)和低延迟B(LB)配置实现了7.7%、5.0%、2.6%的Y BD速率降低,分别在有损编码中使用帧内块复制(IBC)和P2 SM具有相同的4个编码树单元(CTU)搜索范围,并且对于AI,比特率节省6.0%、3.9%、3.1%,RA、LB配置,分别在无损编码中,IBC具有全帧搜索范围,而P2 SM仅具有2个CTU搜索范围,具有非常低的附加编码和解码复杂度。
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-16.4${+}$SCM-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.
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