Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Crazy computer vision stuff in the browser
Search
Zeno Rocha
April 28, 2015
Programming
5
1k
Crazy computer vision stuff in the browser
Zeno Rocha
April 28, 2015
Tweet
Share
More Decks by Zeno Rocha
See All by Zeno Rocha
The Next Generation of Developer-First Products
zenorocha
1
620
7 Habits of Highly Productive Developers
zenorocha
1
400
7 Hábitos de Desenvolvedores Altamente Produtivos
zenorocha
1
520
What's new in the Liferay Community
zenorocha
0
690
Launching Liferay Projects Faster with WeDeploy
zenorocha
1
570
How Liferay fits into the real of latest technologies
zenorocha
0
610
Estoicismo e JavaScript
zenorocha
3
1.1k
Por que ninguém se importa com seu novo projeto open source?
zenorocha
2
990
Como investir em... você!
zenorocha
1
570
Other Decks in Programming
See All in Programming
Reading Rails 1.0 Source Code
okuramasafumi
0
260
Cache Me If You Can
ryunen344
2
4.2k
楽して成果を出すためのセルフリソース管理
clipnote
0
190
AIと私たちの学習の変化を考える - Claude Codeの学習モードを例に
azukiazusa1
11
4.5k
AI Agents: How Do They Work and How to Build Them @ Shift 2025
slobodan
0
110
Improving my own Ruby thereafter
sisshiki1969
1
160
実用的なGOCACHEPROG実装をするために / golang.tokyo #40
mazrean
1
300
Introducing ReActionView: A new ActionView-compatible ERB Engine @ Rails World 2025, Amsterdam
marcoroth
0
710
CloudflareのChat Agent Starter Kitで簡単!AIチャットボット構築
syumai
2
520
意外と簡単!?フロントエンドでパスキー認証を実現する WebAuthn
teamlab
PRO
2
780
Flutter with Dart MCP: All You Need - 박제창 2025 I/O Extended Busan
itsmedreamwalker
0
150
Tool Catalog Agent for Bedrock AgentCore Gateway
licux
7
2.6k
Featured
See All Featured
What's in a price? How to price your products and services
michaelherold
246
12k
The World Runs on Bad Software
bkeepers
PRO
70
11k
Into the Great Unknown - MozCon
thekraken
40
2k
Imperfection Machines: The Place of Print at Facebook
scottboms
268
13k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
248
1.3M
The Pragmatic Product Professional
lauravandoore
36
6.9k
YesSQL, Process and Tooling at Scale
rocio
173
14k
Docker and Python
trallard
46
3.6k
GraphQLの誤解/rethinking-graphql
sonatard
72
11k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
morganepeng
131
19k
Designing for Performance
lara
610
69k
Building Adaptive Systems
keathley
43
2.7k
Transcript
CRAZY COMPUTER vision stuff in the browser
.html .css .js
zenorocha
None
None
None
None
None
computer vision ? what is
Persistence of vision
Persistence of vision
Motion perception
Motion perception
vimeo.com/108331968
Face detection
Face recognition
Autonomous robots
Autonomous robots
Virtual reality
Augmented reality
Augmented reality
how to do that?
None
None
how to do that in the browser?
1. Access the camera
None
Request user’s webcam navigator.getUserMedia({ video: true }, onSuccess, onFail);
Request user’s webcam navigator.getUserMedia({ video: true }, onSuccess, onFail);
Request user’s webcam navigator.getUserMedia({ video: true }, onSuccess, onFail);
2. Reproduce in a video
<video>
Get User Media callback function onSuccess(stream) { var video =
document.querySelector('video'); video.src = URL.createObjectURL(stream); video.onloadedmetadata = function(e) { // Done }; }
Get User Media callback function onSuccess(stream) { var video =
document.querySelector('video'); video.src = URL.createObjectURL(stream); video.onloadedmetadata = function(e) { // Done }; }
Get User Media callback function onSuccess(stream) { var video =
document.querySelector('video'); video.src = URL.createObjectURL(stream); video.onloadedmetadata = function(e) { // Done }; }
Get User Media callback function onSuccess(stream) { var video =
document.querySelector('video'); video.src = URL.createObjectURL(stream); video.onloadedmetadata = function(e) { // Done }; }
3. Obtain pixel matrix
<canvas>
4. Tracking algorithms
Request accepted Request access to the camera Reproduce camera <video>
Obtain pixel matrix <canvas> Tracking algorithms Result Summary
tracking.js
None
Maira Bello Team eduardo lundgren java pablo carvalho zeno rocha
100% JavaScript! Open source No dependencies Simple and intuitive API
Automatic setup Built-in tracking algorithms Easily extensible High performance Unit & performance regression tests ~ 7 Kb
tracker color
Demo
var tracker = new tracking.ColorTracker('magenta'); tracking.track('#video', tracker, { camera: true
}); tracker.on('track', function(event) { event.data.forEach(function(rect) { // Your code goes here }); });
var tracker = new tracking.ColorTracker('magenta'); tracking.track('#video', tracker, { camera: true
}); tracker.on('track', function(event) { event.data.forEach(function(rect) { // Your code goes here }); });
var tracker = new tracking.ColorTracker('magenta'); tracking.track('#video', tracker, { camera: true
}); tracker.on('track', function(event) { event.data.forEach(function(rect) { // Your code goes here }); });
tracker object
Demo
var tracker = new tracking.ObjectTracker('face'); tracking.track('#video', tracker, { camera: true
}); tracker.on('track', function(event) { event.data.forEach(function(rect) { // Your code goes here }); });
var tracker = new tracking.ObjectTracker('face'); tracking.track('#video', tracker, { camera: true
}); tracker.on('track', function(event) { event.data.forEach(function(rect) { // Your code goes here }); });
var tracker = new tracking.ObjectTracker('face'); tracking.track('#video', tracker, { camera: true
}); tracker.on('track', function(event) { event.data.forEach(function(rect) { // Your code goes here }); });
tracker custom
var MyTracker = function() { MyTracker.base(this, 'constructor'); }; tracking.inherits(MyTracker, tracking.Tracker);
MyTracker.prototype.track = function(pxs, width, height) { // Your code here this.emit('track', { // Your code here }); };
var MyTracker = function() { MyTracker.base(this, 'constructor'); }; tracking.inherits(MyTracker, tracking.Tracker);
MyTracker.prototype.track = function(pxs, width, height) { // Your code here this.emit('track', { // Your code here }); };
var MyTracker = function() { MyTracker.base(this, 'constructor'); }; tracking.inherits(MyTracker, tracking.Tracker);
MyTracker.prototype.track = function(pxs, width, height) { // Your code here this.emit('track', { // Your code here }); };
var MyTracker = function() { MyTracker.base(this, 'constructor'); }; tracking.inherits(MyTracker, tracking.Tracker);
MyTracker.prototype.track = function(pxs, width, height) { // Your code here this.emit('track', { // Your code here }); };
var tracker = new tracking.MyTracker(); tracking.track('#video', tracker, { camera: true
}); tracker.on('track', function(event) { event.data.forEach(function(rect) { // Your code goes here }); });
var tracker = new tracking.MyTracker(); tracking.track('#video', tracker, { camera: true
}); tracker.on('track', function(event) { event.data.forEach(function(rect) { // Your code goes here }); });
var tracker = new tracking.MyTracker(); tracking.track('#video', tracker, { camera: true
}); tracker.on('track', function(event) { event.data.forEach(function(rect) { // Your code goes here }); });
who is using it?
kdzwinel.github.io/JS-face-tracking-demo
thedevilini.com/#masks
lessons learned
24 fps 60 fps 1000ms / 24fps = 41ms per
frame
24 fps 60 fps 1000ms / 24fps = 41ms per
frame
None
None
None
Int32Array Uint16Array Float64Array Uint8ClampedArray [ ] Typed arrays
jsperf.com/tracking-js-arrays
jsperf.com/tracking-js-arithmetic
Demo
None
None
web components > > -
how we create a component nowadays?
1. Never create! Just use a plugin
2. Copy & paste someone’s code
3. And hope it works
3. And hope it works
web components
web components Templates
web components Templates Custom Elements
web components Templates Custom Elements Shadow DOM
web components HTML Imports Templates Custom Elements Shadow DOM
None
var tracker = new tracking.ColorTracker('magenta'); tracking.track('#video', tracker, { camera: true
}); tracker.on('track', function(event) { event.data.forEach(function(rect) { // Your code goes here }); }); Remember?
Using Web Components… <video is="video-color-tracking" target="magenta" camera="true" ontrack="onResult" </video>
more ?
trackingjs.com
Where the magic happens Your comfort zone
Thanks! zenorocha.com @zenorocha
Thanks! zenorocha.com @zenorocha