A little toy implementation of the canny-edge-detection algorithm in WPGU.

Usage

cargo run --release -- <path to image file> <path to output directory>

# Example: Applies edge detection to the given image and saves each change after each step to the given output directory.
cargo run --release -- /tmp/image.png /tmp/output_dir

Example

Here's an example which images will be generated.

Source image (example-images/castle.jpg):

1. Gray scale

2. Gaussian filter

3. Horizontal and vertical edges

3.1 Horizontal edges

3.2 Vertical edges

4. Magnitude and radians

4.1 Magnitude

4.2 Radians

5. Non-maximum-suppression

6. Double Threshold

7. Edge tracking

Sources to learn

• Canny algo: https://justin-liang.com/tutorials/canny/
• How to create gray scale: https://www.baeldung.com/cs/convert-rgb-to-grayscale