Discrete Cosine Transform

Discrete Cosine Transform
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DOI:
10.1142/9789812810298_0015
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发表时间:
1996-04
期刊:
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影响因子:
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通讯作者:
S. Merrill Weiss
S. Merrill Weiss
中科院分区:
其他
文献类型:
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作者:
S. Merrill Weiss

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离散余弦变换(DCT)是一种傅里叶相关变换,类似于离散傅里叶变换(DFT),但只使用实数。它相当于大约两倍长度的DFT,对具有偶对称的实际数据进行操作(因为实偶函数的傅里叶变换是实偶的),其中在某些变体中,输入和/或输出数据移位了一半样本。(有八种标准变体,其中四种是常见的。)
The discrete cosine transform (DCT) is a Fourier-related transform similar to the discrete Fourier transform (DFT), but using only real numbers. It is equivalent to a DFT of roughly twice the length, operating on real data with even symmetry (since the Fourier transform of a real and even function is real and even), where in some variants the input and/or output data are shifted by half a sample. (There are eight standard variants, of which four are common.)