Describe how transform coding can be employed to compress image data.
Describe the Walsh-Hadamard transform on a one-dimensional array of 4 grayscale values.
Extend this to the Walsh transform for a two-dimensional array of 22 grayscale values.
Make an analogous transform for a three-dimensional array of 2 x 2 x 2 grayscale values.
Comprise sufficient algebra in your answers to permit a competent programmer to implement the algorithm.