JPEG compressed image recoding method for improving entropy coding efficiency

The invention discloses a JPEG (Joint Photographic Experts Group) compressed image recoding method for improving entropy coding efficiency, which belongs to the field of image signal processing and comprises the following steps of: extracting a Huffman coding definition table of each data component of a JPEG image and constructing a Huffman tree; extracting stroke length codes of all data components in the entropy coded data stream, and counting the number; reallocating Huffman codes to all travel length coded values of each data component; modifying Huffman codes corresponding to the corresponding stroke length code values in the entropy coding section; and recombining the JPEG image data stream to complete JPEG image recoding. According to the method, the entropy coding efficiency performance of the JPEG image can be improved, and the size of the JPEG image file is reduced under the condition that the image quality is kept completely consistent and the format compatibility of the JPEG image is kept. 本发明公开了一