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

**URL:** https://discourse.processing.org/t/image-compression-using-the-walsh-hadamard-transform-for-fun/41567
**Category:** Gallery
**Created:** [April 2, 2023, 3:43am UTC](https://discourse.processing.org/t/image-compression-using-the-walsh-hadamard-transform-for-fun/41567 "2023-04-02T03:43:46Z")
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### Author: ![seanc87](https://avatars.discourse-cdn.com/v4/letter/s/b5e925/32.png) [@seanc87](https://discourse.processing.org/u/seanc87)
#### Post date: [April 2, 2023, 3:43am UTC](https://discourse.processing.org/t/image-compression-using-the-walsh-hadamard-transform-for-fun/41567/1 "2023-04-02T03:43:47Z")

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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:  
[https://editor.p5js.org/siobhan.491/sketches/BQcmEs9GM](https://editor.p5js.org/siobhan.491/sketches/BQcmEs9GM)  
It was used on some of the early space missions.

Reference:  
[https://www.kdnuggets.com/2021/07/wht-simpler-fast-fourier-transform-fft.html](https://www.kdnuggets.com/2021/07/wht-simpler-fast-fourier-transform-fft.html)