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Efficient word-level sequential coding scheme of bit plane coding for EBCOT in JPEG2000

机译：JPEG2000中EBCOT比特平面编码的高效字级顺序编码方案

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摘要

The embedded block coding with optimized truncation (EBCOT) is the state-of-the-art coding technique for image compression, which is the heart of the latest still image compression standard JPEG2000. EBCOT can be partitioned into three steps: bit plane coding (BPC), context adaptive binary arithmetic coding (CABAC) and post-compression rate-distortion (PCRD) optimization. The bit plane coding in JPEG2000 is a fractional bit-plane coding method, in which the transformed coefficients of a code block are coded bit plane by bit plane with 3 passes in each bit-plane, and context-decision (CX-D) pair of the coded symbol is generated for CABAC. In this paper, a new word-level sequential (WLS) coding scheme for BPC is presented, which makes all the passes coding be completed in one scan, with the context formation in all bit-planes being performed in parallel and all the samples being coded in sequential. The status variables used in context formation are produced on-the-fly. This new algorithm can efficiently implement both the regular mode and vertical causal one recommended by JPEG2000. The proposed algorithm reduces efficiently the size of memory and the amount of memory accessing, and increases significantly the speed of coding. It is well suited for both software and hardware implementation.
机译：具有优化截断（EBCOT）的嵌入式块编码是用于图像压缩的最先进的编码技术，其是最新静止图像压缩标准JPEG2000的核心。 EBCOT可以分为三个步骤：位平面编码（BPC），上下文自适应二进制算术编码（CABAC）和后压缩率 - 失真（PCRD）优化。 JPEG2000中的比特平面编码是分数位平面编码方法，其中代码块的变换系数通过位平面中的编码比特平面，每个位平面中的3传递，以及上下文决定（CX-D）对为CABAC生成编码符号。在本文中，提出了一种用于BPC的新的单级顺序（WLS）编码方案，这使得在一次扫描中完成所有通过编码，并且在所有位平面中的上下文形成并行地执行所有样本编码顺序。上下文形成中使用的状态变量是在飞行中产生的。这种新算法可以有效地实现JPEG2000推荐的常规模式和垂直因果。所提出的算法有效地减少了存储器的大小和存储量，并增加了编码速度。它非常适合软件和硬件实现。

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