为什么JPEG压缩通过8x8块处理图像？ [英] Why JPEG compression processes image by 8x8 blocks?

问题描述

为什么JPEG压缩使用8x8块处理图像，而不是对整个图像应用离散余弦变换？

Why JPEG compression processes image by 8x8 blocks instead of applying Discrete Cosine Transform to the whole image?

推荐答案

8 X 8经过多次实验与其他尺寸的选择。

8 X 8 was chosen after numerous experiments with other sizes.

实验的结论是：
1.任何尺寸大于8 X 8的矩阵更难以进行数学运算（如变换等）不支持硬件或需要更长的时间。
2.任何大小小于8 X 8的矩阵都没有足够的信息来与管道一起继续。

The conclusions of experiments are: 1. Any matrices of sizes greater than 8 X 8 are harder to do mathematical operations (like transforms etc..) or not supported by hardware or take longer time. 2. Any matrices of sizes less than 8 X 8 dont have enough information to continue along with the pipeline. It results in bad quality of the compressed image.

阅读，我的博客， http://nboddula.blogspot.com/2013/05/image-compression-how-jpeg-works.html

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