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<!DOCTYPE html>
<html>
<head>
<title>Making Face Filters - PCD 2020 - Workshop</title>
<meta charset="utf-8">
<style>
@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
@import url(https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic);
@import url(https://fonts.googleapis.com/css?family=Ubuntu+Mono:400,700,400italic);
body { font-family: 'Droid Serif'; }
h1, h2, h3 {
font-family: 'Yanone Kaffeesatz';
font-weight: normal;
}
.remark-code, .remark-inline-code { font-family: 'Ubuntu Mono'; }
</style>
</head>
<body>
<textarea id="source">
class: center, middle, inverse
# Making Face Filters (inside a browser!)
### Shailendra Paliwal ([@ziscore](http://shailendra.me) 👨🏼💻, 🏃🏼♂️, 🚵🏼♂️)
---
## `shailendra.me/face-filters-demos`
---
# Workshop Agenda
By the end of this workshop, you will know how to track faces and draw objects on them. That's a face filter, right?
But, before we arrive at the end, we need to know a few things...
1. What happens under the hood with face filters?
---
# Workshop Agenda
By the end of this workshop, you will know how to track faces and draw objects on them. That's a face filter, right?
But, before we arrive at the end, we need to know a few things...
1. What happens under the hood with face filters?
1. Face Detection vs Face Tracking vs Face Recognition
1. Using an External Library
---
# Workshop Agenda
By the end of this workshop, you will know how to track faces and draw objects on them. That's a face filter, right?
But, before we arrive at the end, we need to know a few things...
1. What happens under the hood with face filters?
1. Face Detection vs Face Tracking vs Face Recognition
1. Using an External Library
1. [Hands On] Tracking a Face
1. How do these libraries work?
1. [Hands On] Recreating some classic Face Filters
---
class: center, middle, inverse
# Face Detection
vs
# Face Tracking
vs
# Face Recognition
---
# Using the webcam
```js
function setup() {
// add a webcam capture
capture = createCapture(VIDEO);
// show this capture
capture.show();
// create a canvas for this capture
createCanvas(400, 400);
}
```
.footnote[Go directly to [the P5 Editor - WebcamDemo](https://editor.p5js.org/zscore/full/NAnfbmQv)]
---
class: middle
# Is this enough though?
Wouldn't it be cool if we could add trails like a Vector to this as well?
---
# Is this enough though?
Wouldn't it be cool if we could add trails like a Vector to this as well?
```js
function setup() {
createCanvas(400, 400);
capture = createCapture(VIDEO);
capture.hide();
}
function draw() {
// display at half opacity
tint(255, 20);
image(capture, 0, 0, width, width * capture.height / capture.width);
}
```
.footnote[Go directly to [the P5 Editor - demo0](https://editor.p5js.org/zscore/full/m1DS7Ijr)]
.footnote[or [try the demo](https://shailendra.me/face-filters-demos/demo0)]
---
# Using External Libraries
Programmers create black boxes that other folks can use without going into the details of how does the black box works.
---
# Tracking a face
## Enters *CLMTracker*
> clmtrackr is a javascript library for fitting facial models to faces in images and video, and can be used for getting precise positions of facial features in an image, or precisely tracking faces in video.
Seems good enough?
.footnote[CLM stands for Constraint Local Models]
---
# Tracking a face
```js
function setup() {
// setup camera capture
var videoInput = createCapture(VIDEO);
videoInput.size(size, size);
videoInput.position(0, 0);
// setup canvas
var cnv = createCanvas(size, size);
cnv.position(0, 0);
// setup tracker
ctracker = new clm.tracker();
ctracker.init(pModel);
ctracker.start(videoInput.elt);
// define colors
noStroke();
fill('red')
}
```
---
# Tracking a face
```js
function draw() {
// clear the canvas
clear();
// get array of face marker positions [x, y] format
var positions = ctracker.getCurrentPosition();
for (var i=0; i < positions.length; i++) {
// set the color of the ellipse based on position on screen
circle(positions[i][0], positions[i][1], 5);
}
}
```
.footnote[Go directly to [the P5 Editor - demo1](https://editor.p5js.org/zscore/full/3abLY0OF)]
.footnote[or [try it yourself](https://shailendra.me/face-filters-demos/demo1)]
---
# How does it work?
```js
// get array of face marker positions [x, y] format
var positions = ctracker.getCurrentPosition();
```
---
# Recreating Classic Face Filters
### Ambika's Section 144
#### Yesterday's showcase
[link to tweet](https://twitter.com/ziscore/status/1224543093958963200)
How do we do it?
---
# Recreating Classic Face Filters
### Ambika's Section 144
Add a global variable
```js
var points_of_interest = [62];
```
Change what we do with array `positions`
```js
for (var i=0; i < positions.length; i++) {
// check if are we interest in this point
if(points_of_interest.includes(i)) {
// write a large emoji at this location
textSize(250);
textAlign(CENTER);
text('🤩', positions[i][0], positions[i][1]);
}
}
```
.footnote[Go directly to [the P5 Editor - demo2](https://editor.p5js.org/zscore/full/cOWdCGdd)]
.footnote[or [try it yourself](https://shailendra.me/face-filters-demos/demo2)]
---
# Recreating Classic Face Filters
### Dog Filter?????
---
# Dog Filter?????
### How do we make it?
Elements of the filter,
1. Puts dog ears on top of your face
2. Puts a dog nose
3. If you open your mouth, there's also a dog tongue!
---
# Dog Filter?????
### How do we make it?
```
> Implementation of this filter has been left as an exercise for the reader
```
---
# Dog Filter?????
## Resources
Adding an image,
```js
let dog_nose;
function preload() {
dog_nose = loadImage('path/to/an/image/from/the/internet.jpg');
}
function setup() {
// image(image_name, position_x, position_y)
image(dog_nose, 0, 0);
}
```
---
class: middle
# Spacer
[link](https://editor.p5js.org/zscore/present/Dru3FOH3)
---
# Eye Trails
<blockquote class="twitter-tweet"><p lang="en" dir="ltr">My goal is to make ig regret giving me access to filters <a href="https://t.co/VROJwTSp7J">pic.twitter.com/VROJwTSp7J</a></p>— zach lieberman (@zachlieberman) <a href="https://twitter.com/zachlieberman/status/1129416333425336320?ref_src=twsrc%5Etfw">May 17, 2019</a></blockquote> <script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
How do we do this?
---
# Eye Trails
How do we crop the canvas?
```js
var croppedCanvas = get(x, y, width, height);
```
---
# Eye Trails
Something like this?
```js
var left_eye = [27], right_eye = [32];
var lastFrameLeft, lastFrameRight;
```
```js
for (var i=0; i < positions.length; i++) {
// check if are we interest in this point
if(left_eye.includes(i)) {
lastFrameLeft = get(positions[i][0] - 10, positions[i][1] - 10, 20, 20);
image(lastFrameLeft, positions[i][0], positions[i][1]);
}
///
if(right_eye.includes(i)) {
lastFrameRight = get(positions[i][0] - 10, positions[i][1] - 10, 20, 20);
image(lastFrameRight, positions[i][0], positions[i][1]);
}
}
```
---
# Eye Trails
More trails!
```js
for (var i=0; i < positions.length; i++) {
// check if are we interest in this point
if(left_eye.includes(i)) {
lastFrameLeft = get(positions[i][0] - 10, positions[i][1] - 10, 20, 20);
image(lastFrameLeft, positions[i][0], positions[i][1]);
image(lastFrameLeft, positions[i][0] + 5, positions[i][1] + 5);
image(lastFrameLeft, positions[i][0] + 10, positions[i][1] + 10);
image(lastFrameLeft, positions[i][0] + 15, positions[i][1] + 15);
}
///
if(right_eye.includes(i)) {
lastFrameRight = get(positions[i][0] - 10, positions[i][1] - 10, 20, 20);
image(lastFrameRight, positions[i][0], positions[i][1]);
image(lastFrameRight, positions[i][0] + 5, positions[i][1] + 5);
image(lastFrameRight, positions[i][0] + 10, positions[i][1] + 10);
image(lastFrameRight, positions[i][0] + 15, positions[i][1] + 15);
}
}
```
.footnote[Go directly to [the P5 Editor - demo3](https://editor.p5js.org/zscore/full/vYbhbiZU)]
.footnote[or [try it yourself](https://shailendra.me/face-filters-demos/demo3)]
---
classes: middle
# Thanks!
---
# Resources
1. CLMTracker - [link to repo](https://github.com/auduno/clmtrackr)
2. Computer Vision Examples by Kyle McDonald- [link](https://kylemcdonald.github.io/cv-examples/)
</textarea>
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</script>
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</body>
</html>