对一帧YUV为4:2:0的图象进行DCT变化和量化以及进行反变换和反量化，并在dos下显示出一个4*4矩阵的变化和量化过程-Of a YUV to 4:2:0 image and quantify changes to DCT, as well as anti-transform and Inverse Quantization, and under dos shows a 4* 4 matrix of the process of change and to quantify
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