Haar Wavelet Image Compression Visualization

This is a backend service written in Go (Gin) that shows the visualization of image compression with Haar Wavelet.

How to use

Visit https://haar.linyuanlin.com to see the visualization.

How to use (as API service)

Assume you have an image file with name origin.bmp (currently only .bmp is supported) and you want to compress it.

Post the image to the /upload endpoint with form field name image:

curl -F "image=@origin.bmp" https://api.haar.linyuanlin.com/upload

# > {"id":"e9b6a509"}

You will get the id of the image (e9b6a509 in this example).

Then, you can use this id to get each step of the haar wavelet compression:

curl "https://api.haar.linyuanlin.com/visualization?uid=e9b6a509" --output result.jpg

The result.jpg is identical to the original image, because you don't specify the step option. Which means this is step=0 (original image).

If you want to see the compression result at step 1, you can use the following command:

curl "https://api.haar.linyuanlin.com/visualization?uid=e9b6a509&step=1" --output result.jpg

You can see the result after first step of haar wavelet transform.