4-D vector DCT orthogonal transform 四维矢量DCT变换
The performance of wavelet transformation is better than DCT transformation in static 2d picture, so wavelet transformation is adopt in JPEG2000 and MPEG-4 international standards.
静态图像的小波变换方法性能优于DCT变换方法，因而被最新的JPEG2000和MPEG - 4国际标准所采纳。
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