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@zenorocha tracking.js A modern approach for Computer Vision on the web

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Computer Vision

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Face detection

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Face recognition

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Autonomous robots

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Virtual reality

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Augmented reality

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How to do that?

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OpenCV

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ARToolkit

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How to do that in the browser?

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Access the camera #1

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Request user’s webcam navigator.getUserMedia({ video: true }, onSuccess, onFail);

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Reproduce it in a video #2

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Success callback function onSuccess(stream) { var video = document.querySelector('video'); video.src = window.URL.createObjectURL(stream); video.onloadedmetadata = function(e) { // Pronto }; }

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Obtain the pixel array #3

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Tracking algorithms #4

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Summary User request Access the camera Reproduce it in a video Tracking algorithms Obtain the pixel array Result

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tracking.js

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Maira Bello Pablo Carvalho Zeno Rocha Team Eduardo Lundgren Java

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100% JavaScript! Open Source No dependencies tracking.js Built-in tracking algorithms Easily extensible Simple and intuitive API High performance Unit & performance regression tests Automatic setup ~ 7 Kb

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Trackers

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Color Tracker

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Demo

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var tracker = new tracking.ColorTracker(‘magenta’); ! tracking.track('#video', tracker, { camera: true }); ! tracker.on('track', function(event) { event.data.forEach(function(rect) { // Seu código aqui }); });

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Object Tracker

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Demo

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var tracker = new tracking.ObjectTracker(‘face’); ! tracking.track('#video', tracker, { camera: true }); ! tracker.on('track', function(event) { event.data.forEach(function(rect) { // Seu código aqui }); });

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Custom Tracker

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var MyTracker = function() { MyTracker.base(this, 'constructor'); }; ! tracking.inherits(MyTracker, tracking.Tracker); ! MyTracker.prototype.track = function(pixels, width, height) { // Seu código aqui ! this.emit('track', { // Seu código aqui }); };

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var tracker = new tracking.MyTracker(); ! tracking.track('#video', tracker, { camera: true }); ! tracker.on('track', function(event) { event.data.forEach(function(rect) { // Seu código aqui }); });

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Utilities

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Fast

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Brief

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Lessons learned

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41ms per frame 24 fps Real time

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Algorithm Complexity

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Int32Array Uint16Array Float64Array Uint8ClampedArray Typed Arrays

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jsperf.com/tracking-js-arrays

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jsperf.com/tracking-js-arithmetic

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Demo

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Web Components >

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var tracker = new tracking.ColorTracker(‘magenta’); ! tracking.track('#video', tracker, { camera: true }); ! tracker.on('track', function(event) { event.data.forEach(function(rect) { // Seu código aqui }); }); Remember?

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Using Web Components…

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Documentation

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trackingjs.com

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Thanks! trackingjs.com [email protected] twitter.com/zenorocha