Method and system for data compression

A method for data compression, comprising:

• obtaining scanning data to be compressed;
• compressing the scanning data using a first compression method to obtain a first compressed data, where compressing the scanning data using the first compression method comprises:
• performing a channel combination on each data of the scanning data along a channel direction according to a combination parameter which does not affect a center scanning area of the scanning data, so as to obtain data after channel combination, performing a difference calculation on the data after channel combination, so as to obtain a result of difference calculation;
• and performing a lossless coding on the result of difference calculation to obtain the first compressed data;
• and
• determining the first compressed data as a compression result data corresponding to the scanning data.

A system for data compression, comprising:

• an acquisition unit, adapted for obtaining scanning data to be compressed;
• a first compression unit, adapted for compressing the scanning data using a first compression method to obtain a first compressed data;
• a second compression unit, adapted for compressing the scanning data using a second compression method to obtain a second compressed data;
• a first judge unit, adapted for determining whether the compression ratio of the first compressed data meets a predetermined compression ratio requirement;
• a first determination unit, adapted for, if a determining result of the first judge unit is yes, determining the first compressed data as a compression result data corresponding to the scanning data;
• and
• a second determination unit, adapted for, if a determining result of the first judge unit is no, determining the second compressed data as a compression result data corresponding to the scanning data.