iDCT2

InverseCosineTransformMatrix_DCT2 Inverse of forward DCT-II matrix.

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Declaration

 matrix = iDCT2(N)

Parameters

• N input argument N

Returns

• matrix output value matrix

Discussion

InverseCosineTransformMatrix_DCT2 Inverse of forward DCT-II matrix This inverts CosineTransformForwardMatrix_DCT2 when the forward uses the 2/N scaling above (with no extra row halving). Implementation: DCT-III with DC (first) COLUMN halved.