https://github.com/yuaanlin/haar-wavelet-image-compression-visualization

A backend service written in Go (Gin) that shows the visualization of image compression with Haar Wavelet.
https://github.com/yuaanlin/haar-wavelet-image-compression-visualization

gin gin-gonic go golang haar-wavelet-tranforms haar-wavelets image-compression image-processing multimedia zhejiang-university zju

Last synced: 2 months ago
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A backend service written in Go (Gin) that shows the visualization of image compression with Haar Wavelet.

• Host: GitHub
• URL: https://github.com/yuaanlin/haar-wavelet-image-compression-visualization
• Owner: yuaanlin
• Created: 2022-04-02T02:57:04.000Z (about 3 years ago)
• Default Branch: main
• Last Pushed: 2022-04-09T07:33:59.000Z (about 3 years ago)
• Last Synced: 2025-02-03T08:48:20.089Z (4 months ago)
• Topics: gin, gin-gonic, go, golang, haar-wavelet-tranforms, haar-wavelets, image-compression, image-processing, multimedia, zhejiang-university, zju
• Language: Go
• Homepage: https://haar.linyuanlin.com
• Size: 359 KB
• Stars: 2
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md

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README

        
# Haar Wavelet Image Compression Visualization

This is a backend service written in [Go](https://go.dev/) ([Gin](https://github.com/gin-gonic/gin)) that shows the visualization of [image compression with Haar Wavelet](https://medium.com/@digitalpadm/image-compression-haar-wavelet-transform-5d7be3408aa).

## 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.

![./images/origin.bmp](./images/origin.bmp)

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

```bash

curl -F "[email protected]" 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:

```bash

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).

![./images/step-0.jpg](./images/step-0.jpg)

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

```bash

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.

![./images/step-1.jpg](./images/step-1.jpg)