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Online dictionary - over 2 million references
 






1. 分离余弦变换 表达信号波形的DCT A技术，余弦的一个被衡量的总和。 DCT对许多是中央的信号处理，特别是视频压缩。 特定数据Ai， i是一个整数在范围0对N-1，将编码器使用即的向前DCT是： Bk =总和Ai cospi k/N 2 i + 1/2 i=0对N-1 Bk为频率空间被定义易变的k的所有价值，但我们对整数k在范围0只关心对N-1。 将译码器使用即的相反DCT是： AAi=总和Bk 2-deltak-0 cospi k/N2 i + 1/2 k=0对N-1， deltak是Kronecker三角洲。 在此和分离傅立叶变换DFT之间的主要区别是DFT传统上假设，数据Ai周期性地继续通过N的期间，而DCT假设，数据继续通过它的镜象，然后周期性地继续通过2N的期间。 数学上，这变换对是确切，即AAi == Ai，造成lossless编制程序; 只有当某些系数接近时做压缩发生。 那里在比喻存在快速的DCT算法到快速的傅立叶变换。

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