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首页> 外文期刊>IEEE Transactions on Circuits and Systems for Video Technology >Efficient, low-complexity image coding with a set-partitioning embedded block coder
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Efficient, low-complexity image coding with a set-partitioning embedded block coder

机译:使用集划分嵌入式块编码器进行高效,低复杂度的图像编码

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摘要

We propose an embedded, block-based, image wavelet transform coding algorithm of low complexity. It uses a recursive set-partitioning procedure to sort subsets of wavelet coefficients by maximum magnitude with respect to thresholds that are integer powers of two. It exploits two fundamental characteristics of an image transform-the well-defined hierarchical structure, and energy clustering in frequency and in space. The two partition strategies allow for versatile and efficient coding of several image transform structures, including dyadic, blocks inside subbands, wavelet packets, and discrete cosine transform (DCT). We describe the use of this coding algorithm in several implementations, including reversible (lossless) coding and its adaptation for color images, and show extensive comparisons with other state-of-the-art coders, such as set partitioning in hierarchical trees (SPIHT) and JPEG2000. We conclude that this algorithm, in addition to being very flexible, retains all the desirable features of these algorithms and is highly competitive to them in compression efficiency.
机译:我们提出了一种嵌入式,基于块的,低复杂度的图像小波变换编码算法。它使用递归集划分过程,以相对于阈值为2的整数次方的最大幅度,对小波系数的子集进行排序。它利用了图像变换的两个基本特征-明确定义的层次结构以及在频率和空间中的能量聚类。这两种划分策略允许对几种图像变换结构进行通用且高效的编码,包括二进位,子带内的块,小波包和离散余弦变换(DCT)。我们在几种实现方式中描述了这种编码算法的使用,包括可逆(无损)编码及其对彩色图像的适应性,并展示了与其他最新编码器的广泛比较,例如层次树中的集划分(SPIHT)和JPEG2000。我们得出的结论是,该算法除了非常灵活之外,还保留了这些算法的所有理想功能,并且在压缩效率方面具有很高的竞争力。

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