DCT(Discrete Cosine Transform)
  • Fourier transform of a real and even function is real and even.
  • A DCT implies an even extension of the original function.
  • There are eight standard DCT variants, of which four are common.
  • The most common variant of discrete cosine transform is the type-II DCT, which is often called simply "the DCT"; its inverse, the type-III DCT, is correspondingly often called simply "the inverse DCT" or "the IDCT".
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