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dct变化,最简单 的

于 2022-03-16 发布 文件大小:3.98 MB
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非常好用,清楚,明白!          离散余弦变换(Discrete Cosine Transform,DCT)是一种实数域变换,其变换核为实数余弦函数。对一幅图像进行离散余弦变换后,许多有关图像的重要可视信息都集中在DCT变换的一小部分系数中。因此,离散余弦变换(DCT)是有损图像压缩JPEG的核心,同时也是所谓“变换域信息隐藏算法”的主要“变换域(DCT域)”之一。因为图像处理运用二维离散余弦变换,所以直接介绍二维DCT变换。

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