## 19.Define discrete cosine transform.

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The 1-D discrete cosine transform is defined as

For u = 0, 1, 2, . . , N-1. Similarly the inverse DCT is defined as

For u = 0, 1, 2, . . , N-1

Where α is

The corresponding 2-D DCT pair is

For x, y= 0, 1, 2, . . , N-1

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