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clmtrackr
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clmtrackr is a javascript library for fitting facial models to faces in videos or images. It currently is an implementation of constrained local models fitted by regularized landmark mean-shift, as described in Jason M. Saragih's paper. clmtrackr tracks a face and outputs the coordinate positions of the face model as an array, following the numbering of the model below:
The library provides some generic face models that were trained on the MUCT database and some additional self-annotated images. Check out clmtools for building your own models.
For tracking in video, it is recommended to use a browser with WebGL support, though the library should work on any modern browser.
For some more information about Constrained Local Models, take a look at Xiaoguang Yan's excellent tutorial, which was of great help in implementing this library.
Download the minified library clmtrackr.js, and include it in your webpage.
/* clmtrackr libraries */
<script src="js/clmtrackr.js"></script>
The following code initiates the clmtrackr with the default model (see the reference for some alternative models), and starts the tracker running on a video element.
<video id="inputVideo" width="400" height="300" autoplay loop>
<source src="./media/somevideo.ogv" type="video/ogg"/>
</video>
<script type="text/javascript">
var videoInput = document.getElementById('inputVideo');
var ctracker = new clm.tracker();
ctracker.init();
ctracker.start(videoInput);
</script>
You can now get the positions of the tracked facial features as an array via getCurrentPosition()
:
<script type="text/javascript">
function positionLoop() {
requestAnimationFrame(positionLoop);
var positions = ctracker.getCurrentPosition();
// positions = [[x_0, y_0], [x_1,y_1], ... ]
// do something with the positions ...
}
positionLoop();
</script>
You can also use the built in function draw()
to draw the tracked facial model on a canvas :
<canvas id="drawCanvas" width="400" height="300"></canvas>
<script type="text/javascript">
var canvasInput = document.getElementById('drawCanvas');
var cc = canvasInput.getContext('2d');
function drawLoop() {
requestAnimationFrame(drawLoop);
cc.clearRect(0, 0, canvasInput.width, canvasInput.height);
ctracker.draw(canvasInput);
}
drawLoop();
</script>
See the complete example here.
First, install node.js with npm.
In the root directory of clmtrackr, run npm install
then run npm run build
. This will create clmtrackr.js
and clmtrackr.module.js
in build
folder.
To test the examples locally, you need to run a local server. One easy way to do this is to install http-server
, a small node.js utility: npm install -g http-server
. Then run http-server
in the root of clmtrackr and go to https://localhost:8080/examples
in your browser.
clmtrackr is distributed under the MIT License
FAQs
Javascript library for precise tracking of facial features via Constrained Local Models
The npm package clmtrackr receives a total of 85 weekly downloads. As such, clmtrackr popularity was classified as not popular.
We found that clmtrackr demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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