关键词: 图像压缩, 非限制行程, 行程长度编码

Abstract: With the rapid development of the information society，image has become one of the important carriers which can transmit information.Because of the massive content of information of unprocessed image，it is extremely important to work hard at research and develop the technology for image coding.By researching and analyzing the run length encoding，an image compression method of non-restricted run length encoding is presented；the method sets the length flexibility and overcomes the limitations of the traditional run length encoding.Experiment indicates that the improved technique can greatly improve compression efficiency，and the compatibility of the new algorithm is more widespread，especially for the image compression of a large area of continuous shadow and the same color.The efficiency promotion is remarkable.The technique presents a new approach for the technique of static image compression.

Key words: image compression, non-restricted run length encoding, run-length-encoding