Abstract:

In some fields such as medicine, security and remote sensing, the technology of image lossless compression is highly demanded because the difference between the original and reconstructed images cannot be tolerated. During the research and analysis of the dictionary compression methods, an improved al gorithm based on the combination of dynamic and static eircumstances is put forward. Consequently, the new method solves the problem of poor compression  effect during the original period of creating a dictionary. The results of experiments show the compression ratio is increased after the applicw tion o f the improved LZW algorithm.

Key words: image compression;compression algorithm;dictionary compression, LZW