“discrete cosine transform”的概念、定义、翻译、参考文献-科学参考

单词	discrete cosine transform
释义	discrete cosine transform Computer A mathematical operation that analyses an arbitrary waveform into a summation of cosine functions: $C (u) = \sqrt / (2 / N) \sum_{x = 0}^{N - 1} f (x) \cos [(2 x + 1) u π] / 2 N$ where the waveform f(x) is approximated by N samples at x = 0,1,…N−1. Discrete cosine transforms find application in image-compression techniques, for example in JPEG.
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