motion

Motion

A node.js motion detection library written in JavaScript.

Install

npm install motion

Usage

var Motion = require('motion').Motion;
var motion = new Motion();
var hasMotion = motion.detect(image1, image2);

Methods

detect(image1, [image2])

• image1 Array of Number
• image2 (optional): Array of Number

Detect is called with one or two flat arrays of RGBA values. If called with one parameter, detect will use the last image1 as image2.

var Motion = require('motion').Motion;
var motion = new Motion();
  
// img1, img2, img3, img4 created ... 
// all img's are strings of RGBA values
// and look like [128,128,128,255,...]

var hasMotion;

hasMotion = motion.detect(img1);
console.log(hasMotion);
// > false
  
hasMotion = motion.detect(img2);
console.log(hasMotion);
// > true

hasMotion = motion.detect(img3, img4);
console.log(hasMotion);
// > false

getLastImage()

Returns the last image.

var motion = new Motion();

console.log(motion.detect(img1));
// > false
console.log(motion.detect(img2));
// > true

console.log(img2 === motion.getLastImage());
// > true

getBlendedImage(image1, image2)

• image1 Array of Number
• image2 Array of Number

Returns an image with detected motion as white pixels on a black background in the form of a flat array of RGBA numbers.

About

Inspiration for this library comes from Romuald Quantin's excellent write up on motion detection in Javascript.