This is a basic script for pulling out contours/regions from an image.

It uses Moore Neighbourhood contour tracing. For more details on the algorithm/approach see this site.

const output = contours(imageData)

// list of matching contours

• imageData should be thresholded (any non-zero pixel is counted as on)
• only the red value is the only one used

yarn install #or, npm

# build dist/contours
npm run build

# run tests
npm test

# run tests on file change
npm run test:watch

You probably shouldn't use this or whatever.

This is at the state of "just about working". There's a few things that would make it a load more efficient, and maybe a bit nicer to use. Feedback would be appreciated.