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水印

于 2023-08-10 发布 文件大小:4.72 kB
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离散余弦变换(DC T),表示一个图像作为变化幅度和频率的正弦曲线的和。所述DCT2函数计算两维离散余弦变换的图像的(DC T)。直流T有,对于一个典型的图像,大多数关于图像的视觉显著信息被集中在DC T。由于这个原因仅仅几个系数的特性,直流T被经常用于图像压缩的应用程序。例如,直流T是在被称为JPEG国际标准有损图像压缩算法的心脏。(这个名字来自于开发的标准工作组:联合图像专家组)。在实践中,DC T被通常使用相同的基本的效率的技术如在FFT算法实现

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