DiscreteCosineTransform

DiscreteCosineTransform[img] returns the discrete cosine transform (DCT) of img.

DiscreteCosineTransform[img, {n₁,n₂,...}] returns the DCT of a zero-padded img with dimensions n₁×n₂×....

The 1D DCT of a sequence x[n] of length N is defined as

for k = 0,1,...,N-1

The 2D DCT is defined as

for k₁= 0,1,...,N₁-1 and k₂ = 0,1,...,N₂-1,

The argument img may be a vector, matrix, or ImageData expression.

See also User's Guide 8.4, 8.8.

Example

This loads the package.

In[1]:=

This computes and displays the DCT of a bright rectangle on a dark background.

In[2]:=

Out[2]=

Out[2]=

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