Nathan-rectangle-scan NPM

Rectangle scan

Scans an image to see if there is a rectangle in a predefined place.

Setup

npm i nathan-rectangle-scan

const checker = new RectCheck();
const image = new Image();
image.onload = () => alert(checker.check(image, x, y, width, height)) ? "Found a rectangle!" : "Didn't find it"
image.src = "path-to-some-image.jpg";

Demo

Run gulp demo or visit the Live demo

Options

When instantiating the RectCheck class you can pass an object with options. const checker = new RectCheck(options)

name	default	description
edgeThreshhold	250	how much of the search area has to be covered in edge for it to be considered valid
minContrast	80	The amount of contrast needed to be considered an edge
scale	0.5	The amount to scale the image by before running the edge detection (lower is faster)
searchWidth	30	The width (on side sides, height on top and bottom) to search for edges around input area