сontext-adaptive variable length coding
上下文自适应可变长编码
Context-adaptive variable length coding (CAVLC) is one type of entropy coding technique that is currently supported in some coding standards, such as the International Telecommunication Union Standardization Sector (ITU-T) H.264/ Motion Pictures Expert Group (MPEG)-4, Part 10 Advanced Video Coding (AVC) (hereinafter "H.264/ MPEG-4 Part 10 AVC standard"). In accordance with CAVLC as defined in the H.264/MPEG-4, Part 10 AVC standard, an encoder encodes a plurality of syntax elements that represent a coefficient vector. The syntax elements may include a total number of coefficients in the coefficient vector, a number of trailing ones in the coefficient vector, signs of each of the trailing ones, magnitudes (or levels) of nonzero coefficients other than the trailing ones, sum of all runs (i.e., the total number of runs before the last nonzero coefficient), and a run length of zeros before each nonzero coefficient. CAVLC is adaptive in that the encoder adaptively selects the VLC coding tables to use in encoding the syntax elements based on particular characteristics of the coefficient vector.
本发明涉及用于快速上下文自适应可变长编码 (CAVLC) 的H.264解码方法，更具体的，涉及一种有效快速地查找多个表格以在最短时间段内获得CAVLC块的系数以便可以对于低频设计高效的解码器的方法。 [...] H.264编码方法主要分为上下文自适应可变长编码 (CAVLC) 和基于上下文的自适应二进制算术编码 (CABAC)。目前，H.264基线 (Baseline) 和X协议 (profile) 使用CAVLC，主类协议则使用CAVLC和CABAC两种。CAVLC可以通过4个步骤得到系数。第一步骤获得尾随i (trailing ones) Tls和总系数 (total coefficient) 以估计4x4块的形式，第二步骤获得级 (level) 值。第三步骤获得全部零 (total zero) 的值，第四步骤获得Run—before以获得真实的系数。
сontext-adaptive variable length coding
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