High Quality MRC Document Coding

摘要

The mix raster content (MRC) model can be used to implement highly effective document compression algorithms. However, many MRC based methods which achieve high compression ratio can distort some fine details of document quality, such as thin lines, and text edges. In this paper, we present a method called resolution enhanced rendering (RER) to achieve high quality rendering of document containing text, pictures and graphics, while maintaining desired compression ratios. The method applies adaptive dithering to the MRC encoder and then performs a nonlinear prediction in the MRC decoder. Both the dithering and nonlinear prediction algorithms are jointly optimized to produce the best quality rendering. We present experimental results illustrating the performance of our method and comparing it to some existing MRC compression algorithms.