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基于DCT的图像压缩

于 2022-02-02 发布 文件大小:61.91 kB
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     在编码过程中,首先将输入图像分解为8*8大小的数据块,然后用正向二维DCT, 把每个块转变成64个DCT系数值,其中1个数值是直流(DC)系数,即8*8空域图像子块的平均值,其余的63个是交流(AC)系数,接下来对DCT系数进行量化,最后将变换得到的量化的DCT系数进行编码和传送,形成压缩后的图像格式,在解码过程中,先对已编码的量子化的DCT系数进行解码,然后求逆量化并把DCT系数转化为8*8样本像块(使用二维DCT, 反变换),最后将操作完成后的块组合成一个单一的图像,这样就完成了图像的压缩和解压过程。

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