An Adaptive Block-Based Histogram Packing for Improving the Compression Performance of JPEG-LS for Images with Sparse and Locally Sparse Histograms

摘要

In this paper, we propose a new adaptive block-based histogram packing for lossless compression of images with sparse and locally sparse histograms. JPEG-LS provides an efficient lossless compression at a reasonable complexity. However, its efficiency is severely affected when encoding images or blocks containing only a subset of the possible values from the nominal alphabet. The aim of this work is to improve the compression performance of JPEG-LS by introducing a preprocessing technique that leads to improvements. Results of its effectiveness are presented.