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
940
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
550
7 Habits of Highly Productive Developers
zenorocha
1
370
7 Hábitos de Desenvolvedores Altamente Produtivos
zenorocha
1
440
What's new in the Liferay Community
zenorocha
0
650
Launching Liferay Projects Faster with WeDeploy
zenorocha
1
530
How Liferay fits into the real of latest technologies
zenorocha
0
550
Estoicismo e JavaScript
zenorocha
3
1.1k
Por que ninguém se importa com seu novo projeto open source?
zenorocha
2
890
Como investir em... você!
zenorocha
1
530
Other Decks in Programming
See All in Programming
Honoをフロントエンドで使う 3つのやり方
yusukebe
4
2.1k
Grafana Cloudとソラカメ
devoc
0
140
sappoRo.R #12 初心者セッション
kosugitti
0
230
GAEログのコスト削減
mot_techtalk
0
110
負債になりにくいCSSをデザイナとつくるには?
fsubal
9
2.3k
Amazon S3 TablesとAmazon S3 Metadataを触ってみた / 20250201-jawsug-tochigi-s3tables-s3metadata
kasacchiful
0
100
GitHub Actions × RAGでコードレビューの検証の結果
sho_000
0
240
“あなた” の開発を支援する AI エージェント Bedrock Engineer / introducing-bedrock-engineer
gawa
11
1.8k
第3回関東Kaggler会_AtCoderはKaggleの役に立つ
chettub
3
890
[JAWS-UG横浜 #80] うわっ…今年のServerless アップデート、少なすぎ…?
maroon1st
1
170
JavaScriptツール群「UnJS」を5分で一気に駆け巡る!
k1tikurisu
10
1.8k
AHC041解説
terryu16
0
590
Featured
See All Featured
RailsConf & Balkan Ruby 2019: The Past, Present, and Future of Rails at GitHub
eileencodes
132
33k
Statistics for Hackers
jakevdp
797
220k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
193
16k
GraphQLとの向き合い方2022年版
quramy
44
13k
Fashionably flexible responsive web design (full day workshop)
malarkey
406
66k
For a Future-Friendly Web
brad_frost
176
9.5k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
31
2.1k
Principles of Awesome APIs and How to Build Them.
keavy
126
17k
Why Our Code Smells
bkeepers
PRO
335
57k
Building Adaptive Systems
keathley
40
2.4k
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
addyosmani
3
310
Done Done
chrislema
182
16k
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