Research on the loss-less compression algorithm of the ultrasonic testing of rail

A large amount of data is produced in the process of ultrasonic testing of rail, and it´s necessary to compress the raw data with a loss-less compression algorithm. This paper analyses statistical characteristics of ultrasonic test data of rail, and makes researches on the commonly used loss-less compression algorithm, Huffman compression algorithm and LZW compression algorithm. In order to improve the performance of compression, this paper designs and implements a new loss-less compression algorithm based on the above analysis and then tests the new algorithm with a number of ultrasonic test data files of rail. The test results show that the new algorithm has a relatively high compression ratio and the compression performance is significantly better than Huffman compression algorithm and LZW compression algorithm.