Video data compaction coding method

The invention relates to a compression coding method of video data. Wherein, the original image sequence of video via motion forecast and compensation obtains residual error; projecting residual error into vector space; then using main component analysis algorism to reduce the dimensions of vector; using wide main component analysis algorism to group the factor with reduced dimensions; using main component analysis algorism to reduce the dimensions of factor more; the output of video compressed code is the base of linear space generated in said process, the factor of vector in main component analysis, the average vector of vector group and the motion vector of motion forecast, etc. The invention has better compression efficiency on the video data, and the rebuilt video has better image quality. And the invention loses the unimportant base vector and factor of linear space to expand the signal/noise ratio of video data, therefore, the rebuilt video with less left data can own better effect.