说明: 本程序的目的是通过变化DCT系数以及寻找可以应用的DCT系数的最小值来进行可扩展的MPEG压缩,并且能都达到一个可以接收的效果。 (the purpose of this procedure is adopted, as well as changes in DCT coefficients can be used to find the minimum value of the DCT coefficients to Progressive firms will be able to expand the MPEG compression, and can achieve an acceptable result.)