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<title>JSDoc: Class: VisageTracker</title>
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<h1 class="page-title">Class: VisageTracker</h1>
<section>
<header>
<h2>
VisageTracker
</h2>
</header>
<article>
<div class="container-overview">
<dt>
<h4 class="name" id="VisageTracker"><span class="type-signature"></span>new VisageTracker<span class="signature">(configurationName)</span><span class="type-signature"></span></h4>
</dt>
<dd>
<div class="description">
VisageTracker is a face tracker capable of tracking the head pose, facial features and gaze for multiple faces in video coming from a video file, camera or other sources.
<br/><br/>
Frames (images) need to be passed sequentially to the <a href="VisageTracker.html#track">track()</a> method, which immediately returns results for the given frame.
<br/><br/>
The tracker offers the following outputs, available through <a href="FaceData.html">FaceData</a>:
<ul>
<li>3D head pose</li>
<li>facial expression</li>
<li>gaze information</li>
<li>eye closure</li>
<li>iris radius</li>
<li>facial feature points</li>
<li>full 3D face model, textured</li>
</ul>
<br/><br/>
<b>Note</b>: After the end of use VisageTracker object needs to be deleted to release the allocated memory. Example:
<pre class="prettyprint source"><code>
&lt;script>
m_Tracker = new VisageModule.VisageTracker("../../lib/Facial Features Tracker.cfg");
...
m_Tracker.delete();
&lt;/script>
</code></pre>
<br/><br/>
<h5>Dependencies</h5>
<br/>
VisageTracker requires data files, configuration files and license key file
to be preloaded to virtual file system. Data and configuration files can be found in the <i>www/lib</i> folder.
<br/><br/>
<h6>Data files</h6>
Main tracking data is bundled in the <b>visageSDK.data</b> file and loaded using the <b>visageSDK.js</b> script.
<br/>
Additional data is provided for ears tracking feature within <b>visageEarsRefinerData.data</b> along with <b>visageEarsRefinerData.js</b> loader script.
<br/><br/>
<u id="changeLocation"><i>Changing the location of data files</u></i>
<br/>
By default, loader scripts expect the <b>.data</b> files to be in the same location as <b>the application's main html file</b>,
while <b>visageSDK.wasm</b> is expected to be in the same location as <b>visageSDK.js</b> library file.
However, location of the <i>.data</i> and <i>.wasm</i> files can be changed.
<br/>
The code example below shows how to implement <i>locateFile</i> function and how to set it as an attribute to the VisageModule object.
<br/><br/>
<h6>Configuration and license key files</h6>
Configuration files and the license key files are preloaded using VisageModule's API function assigned to the <i>preRun</i> attribute:
<pre><code>
VisageModule.FS_createPreloadedFile(parent, name, url, canRead, canWrite)
</code></pre>
where <i>parent</i> and <i>name</i> are the path on the virtual file system and the name of the file, respectively.
</br></br>
</br></br>
<h5>visage|SDK initialization order</h5>
<br/>
The order in which the VisageModule is declared and library and data scripts are included is important.
<br/>
<ul>
<li> First, <b>VisageModule</b> object is declared
<ul>
<li> including preloading of the configuration files, license files and possibly, changing the location of data files
</ul>
<li> then <b>visageSDK.js</b> library script is included and
<li> last, external data loader script is included
</ul>
<br/><br/>
Sample usage - changing data files location and script including order:
<br/>
<pre class="prettyprint source"><code>
&lt;script>
licenseName = "lic_web.vlc"
licenseURL = "lic_web.vlc"
var locateFile = function(dataFileName) {var relativePath = "../../lib/" + dataFileName; return relativePath};
VisageModule = {
locateFile: locateFile,
preRun: [function() {
VisageModule.FS_createPreloadedFile('/', 'Head Tracker.cfg', "../../lib/Head Tracker.cfg", true, false);
VisageModule.FS_createPreloadedFile('/', 'NeuralNet.cfg', "../../lib/NeuralNet.cfg", true, false);
VisageModule.FS_createPreloadedFile('/', licenseName, licenseURL, true, false, function(){ }, function(){ alert("Loading License Failed!") });
}],
onRuntimeInitialized: onModuleInitialized
}
&lt;/script>
&lt;script src="../../lib/visageSDK.js"> &lt;/script>
</code></pre>
<br/>
<br/>
<h5 id="configTracker">Configuring VisageTracker</h5>
<br/>
The tracker is fully configurable through comprehensive tracker configuration files provided in visage|SDK and <a href="VisageConfiguration.html">VisageConfiguration</a>
class allowing to customize the tracker in terms of performance, quality and other options.
The configuration files are intended to be used for tracker initialization while the <a href="VisageConfiguration.html">VisageConfiguration</a> class
allows the specific configuration parameter to change in runtime.
<br/><br/>
visage|SDK contains optimal configurations for common uses such as head tracking, facial features tracking and ear tracking.
<br/><br/>
The <a href="doc/VisageTracker Configuration Manual.pdf">VisageTracker Configuration Manual</a> (later in text referred to as VTCM) provides the list of
available configurations and full detail on all available configuration options.
<br/><br/>
Specific configuration parameters are used to enable features such as:
<ul>
<li>ear tracking</li>
<li>pupil refinement</li>
<li>landmarks refinement</li>
<li>smoothing filter</li>
</ul>
<br/>
<h6>Ear tracking</h6>
Ear tracking includes tracking of additional 24 points (12 points per ear).
Detailed illustration of the points' location can be found in the description of the featurePoints2D member.
Ears' feature points are part of the group 10 (10.1 - 10.24). Tracking the ears' points require the 3D model with defined ears vertices,
as well as corresponding points mapping file that includes definition for group 10.
visage|SDK containes examples of such model files within <i>visageEarsRefinerData.data</i>: <i>vft/fm/jk_300_wEars.wfm</i> and <i>vft/fm/jk_300_wEars.fdp</i>.
<br/><br/>
For the list of model's vertices and triangles see chapter <i>2.3.2.1 The jk_300_wEars</i> of <a href="doc/VisageTracker Configuration Manual.pdf">VTCM</a>.
<br/><br/>
A set of three configuration parameters is used to configure ear tracking:
<ul>
<li><i>refine_ears</i></li>
<li><i>mesh_fitting_model</i> and <i>mesh_fitting_fdp</i> if fine 3D mesh is enabled, otherwise <i>pose_fitting_model</i> and <i>pose_fitting_fdp</i></li>
<li><i>smoothing_factors</i> 'ears' group (smoothing_factors[7])</li>
</ul>
visage|SDK provides optimal configuration for ear tracking. Please consult <i>Facial Features Tracker - With Ears.cfg</i> configuration file
for more details on the set configuration values.
<br/><br/>
External data file needed for using ear tracking feature is bundled in:
<ul>
<li><i>visageEarsRefinerData.data</i> (along with loding script <i>visageEarsRefinerData.js</i> )</li>
</ul>
<br/><br/>
<h6>Pupil refinement</h6>
Pupil refinement improves the precision of pupil center-point detection and provides iris radius information.
See process_eyes in chapter <i>2.1. Configuration parameters</i> of <a href="doc/VisageTracker Configuration Manual.pdf">VTCM</a>.
<br/><br/>
<h6>Landmarks refinement</h6>
Landmarks refinement improves tracking accuracy and robustness and minimizes tracking jitter at the cost of reduced tracking speed (performance).
<br/><br/>
<i>refine_landmarks</i> configuration parameter is used to configure the tracking accuracy.
See <i>refine_landmarks</i> in chapter <i>2.1. Configuration parameters</i> of <a href="doc/VisageTracker Configuration Manual.pdf">VTCM</a>.
<br/><br/>
<h6>Smoothing filter</h6>
The tracker can apply a smoothing filter to tracking results to reduce the inevitable tracking noise.
Smoothing factors are adjusted separately for different parts of the face. The smoothing settings in the supplied tracker configurations are adjusted
conservatively to achieve optimal balance between smoothing and delay in tracking response for a general use case.
<br/><br/>
See <i>smoothing_factors</i> in chapter <i>2.1. Configuration parameters</i> of <a href="doc/VisageTracker Configuration Manual.pdf">VTCM</a>.
<br/><br/><br/>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>configurationName</code></td>
<td class="type">
<span class="param-type">string</span>
</td>
<td class="description last">the name of the tracker configuration file (.cfg; default configuration files are provided in lib folder;
for further details see <a href="doc/VisageTracker Configuration Manual.pdf">VTCM</a>).
<br/><br/></td>
</tr>
</tbody>
</table>
<dl class="details">
</dl>
</dd>
</div>
<h3 class="subsection-title">Methods</h3>
<dl>
<dt>
<h4 class="name" id="track"><span class="type-signature"></span>track<span class="signature">(frameWidth, frameHeight, p_imageData, faceDataArray, <span class="optional">format</span>, <span class="optional">origin</span>, <span class="optional">widthStep</span>, <span class="optional">timeStamp</span>, <span class="optional">maxFaces</span>)</span><span class="type-signature"> &rarr; {Int32Array}</span></h4>
</dt>
<dd>
<div class="description">
Performs face tracking in the given image and returns tracking results and status.
This function should be called repeatedly on a series of images in order to perform continuous tracking.
<br/><br/>
If the tracker needs to be initialized, this will be done automatically before tracking is performed on the given image.
Initialization means loading the tracker configuration file, required data files and allocating various data buffers to the given image size.
This operation may take several seconds.
This happens in the following cases:
<br/><br/>
<ul>
<li>In the first frame (first call to <a href="VisageTracker.html#track">VisageTracker.track()</a> function).<br/>
</li><br/>
<li>When frameWidth or frameHeight are changed, i.e. when they are different from the ones used in the last call
to <a href="VisageTracker.html#track">VisageTracker.track()</a> function.<br/>
</li><br/>
<li>If setTrackerConfigurationFile() function was called after the last call
to {@link VisageTracker#track|VisageTracker.track()} function.<br/>
</li><br/>
<li>When maxFaces is changed, i.e. when it its different from the one used in the last call to <a href="VisageTracker.html#track">track()</a> function.<br/>
</li><br/>
</ul>
<br/>
Sample usage:
<br/>
<pre class="prettyprint source"><code>
var m_Tracker,
faceData,
faceDataArray,
frameWidth,
frameHeight;
function initialize(){
//Initialize licensing with the obtained license key file
//It is imperative that initializeLicenseManager method is called before the constructor is called in order for licensing to work
VisageModule.initializeLicenseManager("xxx-xxx-xxx-xxx-xxx-xxx-xxx-xxx-xxx-xxx-xxx.vlc");
//Instantiate the tracker object
m_Tracker = new VisageModule.VisageTracker("../../lib/Facial Features Tracker.cfg");
//Instantiate the face data object
faceDataArray = new VisageModule.FaceDataVector();
faceData = new VisageModule.FaceData();
faceDataArray.push_back(faceData);
frameWidth = canvas.width;
frameHeight = canvas.height;
//Allocate memory for image data
ppixels = VisageModule._malloc(mWidth*mHeight*4);
//Create a view to the memory
pixels = new Uint8ClampedArray(VisageModule.HEAPU8.buffer, ppixels, mWidth*mHeight*4);
}
function onEveryFrame(){
//Obtain the image pixel data
var imageData = canvas.getContext('2d').getImageData(0,0, mWidth, mHeight).data;
//...Fill pixels with image data
//Call the tracking method of the tracker object with 4 parameters: image width, image height, image pixel data and face data object instance
var trackerStatus = [];
trackerStatus = m_Tracker.track(
frameWidth, frameHeight, ppixels, faceDataArray,
VisageModule.VisageTrackerImageFormat.VISAGE_FRAMEGRABBER_FMT_RGBA.value,
VisageModule.VisageTrackerOrigin.VISAGE_FRAMEGRABBER_ORIGIN_TL.value
);
//Based on the tracker return value do some action with the return values located in face data object instance
if (trackerStatus.get(0) === VisageModule.VisageTrackerStatus.TRACK_STAT_OK.value){
drawSomething(faceDataArray.get(0));
}
}
</code></pre>
<br/><br/>
The tracker results are returned in faceDataArray.
<br/>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Argument</th>
<th>Default</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>frameWidth</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
</td>
<td class="default">
</td>
<td class="description last">Width of the frame.</td>
</tr>
<tr>
<td class="name"><code>frameHeight</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
</td>
<td class="default">
</td>
<td class="description last">Height of the frame.</td>
</tr>
<tr>
<td class="name"><code>p_imageData</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
</td>
<td class="default">
</td>
<td class="description last">Pointer to image pixel data, size of the array must correspond to frameWidth and frameHeight.</td>
</tr>
<tr>
<td class="name"><code>faceDataArray</code></td>
<td class="type">
<span class="param-type"><a href="FaceDataVector.html">FaceDataVector</a></span>
</td>
<td class="attributes">
</td>
<td class="default">
</td>
<td class="description last">Array of <a href="FaceData.html">FaceData</a> objects that will receive the tracking results. The size of the faceDataArray is equal to maxFaces parameter.</td>
</tr>
<tr>
<td class="name"><code>format</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
&lt;optional><br>
</td>
<td class="default">
VisageModule.VISAGE_FRAMEGRABBER_FMT_RGB
</td>
<td class="description last">Format of input images passed in p_imageData. It can not change during tracking. Format can be one of the following:<br/>
- VisageModule.VISAGE_FRAMEGRABBER_FMT_RGB: each pixel of the image is represented by three bytes representing red, green and blue channels, respectively.<br/>
- VisageModule.VISAGE_FRAMEGRABBER_FMT_BGR: each pixel of the image is represented by three bytes representing blue, green and red channels, respectively.<br/>
- VisageModule.VISAGE_FRAMEGRABBER_FMT_RGBA: each pixel of the image is represented by four bytes representing red, green, blue and alpha (ignored) channels, respectively.<br/>
- VisageModule.VISAGE_FRAMEGRABBER_FMT_BGRA: each pixel of the image is represented by four bytes representing blue, green, red and alpha (ignored) channels, respectively.<br/>
- VisageModule.VISAGE_FRAMEGRABBER_FMT_LUMINANCE: each pixel of the image is represented by one byte representing the luminance (gray level) of the image.</td>
</tr>
<tr>
<td class="name"><code>origin</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
&lt;optional><br>
</td>
<td class="default">
VisageModule.VISAGE_FRAMEGRABBER_ORIGIN_TL
</td>
<td class="description last">No longer used, therefore, passed value will not have an effect on this function. However, the parameter is left to avoid API changes. <br/></td>
</tr>
<tr>
<td class="name"><code>widthStep</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
&lt;optional><br>
</td>
<td class="default">
0
</td>
<td class="description last">Width of the image data buffer, in bytes.</td>
</tr>
<tr>
<td class="name"><code>timeStamp</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
&lt;optional><br>
</td>
<td class="default">
-1
</td>
<td class="description last">The timestamp of the the input frame in milliseconds. The passed value will be returned with the tracking data for that frame (<a href="FaceData.html#timeStamp">FaceData.timeStamp</a>).
Alternatively, the value of -1 can be passed, in which case the tracker will return time, in milliseconds, measured from the moment when tracking started.</td>
</tr>
<tr>
<td class="name"><code>maxFaces</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
&lt;optional><br>
</td>
<td class="default">
1
</td>
<td class="description last">Maximum number of faces that will be tracked. Increasing this parameter will reduce tracking speed.</td>
</tr>
</tbody>
</table>
<dl class="details">
</dl>
<h5>Returns:</h5>
<div class="param-desc">
array of tracking statuses for each of the tracked faces - see <a href="FaceData.html">FaceData</a> for more details
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Int32Array</span>
</dd>
</dl>
</dd>
<dt>
<h4 class="name" id="setTrackerConfiguration"><span class="type-signature"></span>setTrackerConfiguration<span class="signature">(trackerConfigFile, <span class="optional">au_fitting_disabled</span>, <span class="optional">mesh_fitting_disabled</span>)</span><span class="type-signature"></span></h4>
</dt>
<dd>
<div class="description">
Sets configuration file name.
<br/><br/>
The tracker configuration file name and other configuration parameters are set and will be used for the next tracking session
(i.e. when <a href="VisageTracker.html#track">track()</a>) is called). Default configuration files
(.cfg) are provided in the <i>www/lib</i> folder.
Please refer to the <a href="doc/VisageTracker Configuration Manual.pdf">VisageTracker Configuration Manual</a> for further details on using the configuration files and all configurable options.
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Argument</th>
<th>Default</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>trackerConfigFile</code></td>
<td class="type">
<span class="param-type">string</span>
</td>
<td class="attributes">
</td>
<td class="default">
</td>
<td class="description last">Name of the tracker configuration file.</td>
</tr>
<tr>
<td class="name"><code>au_fitting_disabled</code></td>
<td class="type">
<span class="param-type">boolean</span>
</td>
<td class="attributes">
&lt;optional><br>
</td>
<td class="default">
false
</td>
<td class="description last">Disables the use of the 3D model used to estimate action units (au_fitting_model configuration parameter).</td>
</tr>
<tr>
<td class="name"><code>mesh_fitting_disabled</code></td>
<td class="type">
<span class="param-type">boolean</span>
</td>
<td class="attributes">
&lt;optional><br>
</td>
<td class="default">
false
</td>
<td class="description last">Disables the use of the fine 3D mesh (mesh_fitting_model configuration parameter).
<br/><br/></td>
</tr>
</tbody>
</table>
<dl class="details">
</dl>
</dd>
<dt>
<h4 class="name" id="setConfiguration"><span class="type-signature"></span>setConfiguration<span class="signature">(configuration)</span><span class="type-signature"></span></h4>
</dt>
<dd>
<div class="description">
Sets tracking configuration.
<br/><br/>
The tracker configuration object is set and will be used for the next tracking session (i.e. when <a href="VisageTracker.html#track">track()</a>) is called).
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>configuration</code></td>
<td class="type">
<span class="param-type"><a href="VisageConfiguration.html">VisageConfiguration</a></span>
</td>
<td class="description last">configuration object obtained by calling getTrackerConfiguration() function.
<br/><br/></td>
</tr>
</tbody>
</table>
<dl class="details">
</dl>
</dd>
<dt>
<h4 class="name" id="getConfiguration"><span class="type-signature"></span>getConfiguration<span class="signature">()</span><span class="type-signature"> &rarr; {<a href="VisageConfiguration.html">VisageConfiguration</a>}</span></h4>
</dt>
<dd>
<div class="description">
Returns tracking configuration.
<br/><br/>
</div>
<dl class="details">
</dl>
<h5>Returns:</h5>
<div class="param-desc">
- VisageConfiguration object with the values currently used by tracker.
<br/><br/>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type"><a href="VisageConfiguration.html">VisageConfiguration</a></span>
</dd>
</dl>
</dd>
<dt>
<h4 class="name" id="setIPD"><span class="type-signature"></span>setIPD<span class="signature">(IPD)</span><span class="type-signature"></span></h4>
</dt>
<dd>
<div class="description">
Sets the inter pupillary distance.
<br/><br/>
Inter pupillary distance (IPD) is used by the tracker to estimate the distance of the face from the camera.
By default, IPD is set to 0.065 (65 millimetres) which is considered average. If the actual IPD of the tracked person is known, this function can be used to set the IPD.
As a result, the calculated distance from the camera will be accurate (as long as the camera focal length is also set correctly).
This is important for applications that require accurate distance. For example, in Augmented Reality applications
objects such as virtual eyeglasses can be rendered at appropriate distance and will thus appear in the image with real-life scale.
<br/><br/>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>IPD</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="description last">The inter pupillary distance (IPD) in meters.
<br/><br/></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-see">See:</dt>
<dd class="tag-see">
<ul>
<li><a href="VisageTracker.html#getIPD">getIPD()</a></li>
</ul>
</dd>
</dl>
</dd>
<dt>
<h4 class="name" id="getIPD"><span class="type-signature"></span>getIPD<span class="signature">()</span><span class="type-signature"> &rarr; {number}</span></h4>
</dt>
<dd>
<div class="description">
Returns the current inter pupillary distance (IPD) setting.
<br/><br/>
IPD setting is used by the tracker to estimate the distance of the face from the camera. See setIPD() for further details.
</div>
<dl class="details">
<dt class="tag-see">See:</dt>
<dd class="tag-see">
<ul>
<li><a href="VisageTracker.html#setIPD">setIPD()</a></li>
</ul>
</dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
current setting of inter pupillary distance (IPD) in meters.
<br/><br/>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">number</span>
</dd>
</dl>
</dd>
<dt>
<h4 class="name" id="reset"><span class="type-signature"></span>reset<span class="signature">()</span><span class="type-signature"></span></h4>
</dt>
<dd>
<div class="description">
Reset tracking.
<br/><br/>
Resets the tracker. Tracker will reinitialise with the next call of <a href="VisageTracker.html#track">track()</a> function.
<br/><br/>
</div>
<dl class="details">
</dl>
</dd>
<dt>
<h4 class="name" id="stop"><span class="type-signature"></span>stop<span class="signature">()</span><span class="type-signature"></span></h4>
</dt>
<dd>
<dl class="details">
<dt class="important tag-deprecated">Deprecated:</dt><dd><ul class="dummy"><li>Stops the tracking.
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