Image compression using the Walsh Hadamard transform (for fun.)

There is a simple fast transform that was popular in the 1960s.
It was popular because it didn’t require a lot of compute.
Then everyone forgot about it.
It probably is time to start using the Walsh Hadamard transform (WHT) again, especially since a wider range of applications have been found for it since the 1960s.

The simplist application of the WHT is image compression:
It was used on some of the early space missions.


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