| Recent years, with the explosive development of the internet, we live in a digital-information age. But the digital processing generally creates significant numbers of data, especially for audio or video multimedia information, which is too large to store or to transfer if these digital data couldn't be processed with an efficient method. Data compression is becoming one of enabling key technologies for communication, broadcast, storage and multimedia amusements. But in some domains, such as medicine and security, the application cannot tolerate any difference between the original and reconstructed data. Because of the lower compression ratio while using fundamental lossless compression techniques, some better lossless compression methods or opinions are expected to put forward through the research and analysis of the common losslesss technologies. In this paper, the fundamental lossless compression technologies are firstly explained in brief. After analyzing the image pixel distribution, the writer improves the RLE method and resolves the negative compression when using the RLE8 methods in BMP file format. During the analysis of the compression methods based on dictionary, another improved compression method is brought forward. At the end of the paper, the lossless compression technology is applied to the pipeline nondestructive detection.
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