关键词:  MHC编码, 预处理, 采样, 插值

Abstract:

wo kinds of pre-procession methods were briefly discussed. Firstly, the true-color pictures are changed into bi-value ones, with the black pixels standing for the texts. Secondly, sub-sampling is applied to raise the compression rate (CR) to as about twice or more times as before. For compressing, a method called Modified Huffman Coding, which is a combination of traditional Huffman and Run-length coding method, is applied. After receiving the specially designed code stream, the decoding work reconstructs the pictures with several interpolation algorithms. Experimental results show that the reconstructed pictures are visually perfect with the size no moreTP391.41 than 1% as original ones.

Key words:  Modified Huffman Coding(MHC), pre-processing, sampling, interpolation