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<li class="toctree-l1"><a class="reference internal" href="introduction.html">Introduction</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">Getting started</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#requirements">Requirements</a></li>
<li class="toctree-l2"><a class="reference internal" href="#python-example">Python example</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#output">Output</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#explanation">Explanation</a></li>
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<div class="section" id="getting-started">
<h1>Getting started<a class="headerlink" href="#getting-started" title="Permalink to this headline">¶</a></h1>
<div class="section" id="requirements">
<h2>Requirements<a class="headerlink" href="#requirements" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li><p>The <a class="reference external" href="https://beam.eyeware.tech">Beam application</a> is installed on your system;</p></li>
<li><p>you have an active subscription, which makes you able to receive head and eye tracking data;</p></li>
<li><p>you run the calibration procedure within the Beam application at least once.</p></li>
</ul>
<p>In addition, if you want to use the Python API, you need:</p>
<ul class="simple">
<li><p>Python 3.6;</p></li>
<li><p>NumPy;</p></li>
<li><p>adding <code class="docutils literal notranslate"><span class="pre"><YOUR_BEAM_SDK_INSTALLATION_FOLDER>/API/python</span></code> to your <code class="docutils literal notranslate"><span class="pre">PYTHONPATH</span></code>.</p></li>
</ul>
</div>
<div class="section" id="python-example">
<h2>Python example<a class="headerlink" href="#python-example" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">eyeware.client</span> <span class="kn">import</span> <span class="n">TrackerClient</span>
<span class="kn">import</span> <span class="nn">time</span>
<span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
<span class="c1"># Build tracker client, to establish a communication with the tracker server (an Eyeware application).</span>
<span class="c1">#</span>
<span class="c1"># Constructing the tracker client object without arguments sets a default server hostname and port which</span>
<span class="c1"># work fine in many configurations.</span>
<span class="c1"># However, it is possible to set a specific hostname and port, depending on your setup and network.</span>
<span class="c1"># See the TrackerClient API reference for further information.</span>
<span class="n">tracker</span> <span class="o">=</span> <span class="n">TrackerClient</span><span class="p">()</span>
<span class="c1"># Run forever, until we press ctrl+c</span>
<span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
<span class="c1"># Make sure that the connection with the tracker server (Eyeware application) is up and running.</span>
<span class="k">if</span> <span class="n">tracker</span><span class="o">.</span><span class="n">connected</span><span class="p">:</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" * Head Pose:"</span><span class="p">)</span>
<span class="n">head_pose</span> <span class="o">=</span> <span class="n">tracker</span><span class="o">.</span><span class="n">get_head_pose_info</span><span class="p">()</span>
<span class="n">head_is_lost</span> <span class="o">=</span> <span class="n">head_pose</span><span class="o">.</span><span class="n">is_lost</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" - Lost track: "</span><span class="p">,</span> <span class="n">head_is_lost</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">head_is_lost</span><span class="p">:</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" - Session ID: "</span><span class="p">,</span> <span class="n">head_pose</span><span class="o">.</span><span class="n">track_session_uid</span><span class="p">)</span>
<span class="n">rot</span> <span class="o">=</span> <span class="n">head_pose</span><span class="o">.</span><span class="n">transform</span><span class="o">.</span><span class="n">rotation</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" - Rotation: |</span><span class="si">%5.3f</span><span class="s2"> </span><span class="si">%5.3f</span><span class="s2"> </span><span class="si">%5.3f</span><span class="s2">|"</span> <span class="o">%</span> <span class="p">(</span><span class="n">rot</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">],</span> <span class="n">rot</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">],</span> <span class="n">rot</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">]))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" |</span><span class="si">%5.3f</span><span class="s2"> </span><span class="si">%5.3f</span><span class="s2"> </span><span class="si">%5.3f</span><span class="s2">|"</span> <span class="o">%</span> <span class="p">(</span><span class="n">rot</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">],</span> <span class="n">rot</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">],</span> <span class="n">rot</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">]))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" |</span><span class="si">%5.3f</span><span class="s2"> </span><span class="si">%5.3f</span><span class="s2"> </span><span class="si">%5.3f</span><span class="s2">|"</span> <span class="o">%</span> <span class="p">(</span><span class="n">rot</span><span class="p">[</span><span class="mi">2</span><span class="p">,</span> <span class="mi">0</span><span class="p">],</span> <span class="n">rot</span><span class="p">[</span><span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="p">],</span> <span class="n">rot</span><span class="p">[</span><span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">]))</span>
<span class="n">tr</span> <span class="o">=</span> <span class="n">head_pose</span><span class="o">.</span><span class="n">transform</span><span class="o">.</span><span class="n">translation</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" - Translation: <x=</span><span class="si">%5.3f</span><span class="s2"> m, y=</span><span class="si">%5.3f</span><span class="s2"> m, z=</span><span class="si">%5.3f</span><span class="s2"> m>"</span> <span class="o">%</span> <span class="p">(</span><span class="n">tr</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">tr</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">tr</span><span class="p">[</span><span class="mi">2</span><span class="p">]))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" * Gaze on Screen:"</span><span class="p">)</span>
<span class="n">screen_gaze</span> <span class="o">=</span> <span class="n">tracker</span><span class="o">.</span><span class="n">get_screen_gaze_info</span><span class="p">()</span>
<span class="n">screen_gaze_is_lost</span> <span class="o">=</span> <span class="n">screen_gaze</span><span class="o">.</span><span class="n">is_lost</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" - Lost track: "</span><span class="p">,</span> <span class="n">screen_gaze_is_lost</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">screen_gaze_is_lost</span><span class="p">:</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" - Screen ID: "</span><span class="p">,</span> <span class="n">screen_gaze</span><span class="o">.</span><span class="n">screen_id</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" - Coordinates: <x=</span><span class="si">%5.3f</span><span class="s2"> px, y=</span><span class="si">%5.3f</span><span class="s2"> px>"</span> <span class="o">%</span> <span class="p">(</span><span class="n">screen_gaze</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="n">screen_gaze</span><span class="o">.</span><span class="n">y</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" - Confidence: "</span><span class="p">,</span> <span class="n">screen_gaze</span><span class="o">.</span><span class="n">confidence</span><span class="p">)</span>
<span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">1</span> <span class="o">/</span> <span class="mi">30</span><span class="p">)</span> <span class="c1"># We expect tracking data at 30 Hz</span>
<span class="k">else</span><span class="p">:</span>
<span class="c1"># Print a message every MESSAGE_PERIOD_IN_SECONDS seconds</span>
<span class="n">MESSAGE_PERIOD_IN_SECONDS</span> <span class="o">=</span> <span class="mi">2</span>
<span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="n">MESSAGE_PERIOD_IN_SECONDS</span> <span class="o">-</span> <span class="n">time</span><span class="o">.</span><span class="n">monotonic</span><span class="p">()</span> <span class="o">%</span> <span class="n">MESSAGE_PERIOD_IN_SECONDS</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"No connection with tracker server"</span><span class="p">)</span>
</pre></div>
</div>
<div class="section" id="output">
<h3>Output<a class="headerlink" href="#output" title="Permalink to this headline">¶</a></h3>
<p>Running the example code in a terminal will start printing information in real time.
There will be a lot of prints, one for each frame.
Let us zoom on the printed output associated to one frame only:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">*</span> <span class="n">Head</span> <span class="n">Pose</span><span class="p">:</span>
<span class="o">-</span> <span class="n">Lost</span> <span class="n">track</span><span class="p">:</span> <span class="kc">False</span>
<span class="o">-</span> <span class="n">Session</span> <span class="n">ID</span><span class="p">:</span> <span class="mi">1</span>
<span class="o">-</span> <span class="n">Rotation</span><span class="p">:</span> <span class="o">|-</span><span class="mf">0.999</span> <span class="o">-</span><span class="mf">0.005</span> <span class="o">-</span><span class="mf">0.045</span><span class="o">|</span>
<span class="o">|-</span><span class="mf">0.008</span> <span class="mf">0.999</span> <span class="mf">0.051</span><span class="o">|</span>
<span class="o">|</span><span class="mf">0.045</span> <span class="mf">0.051</span> <span class="o">-</span><span class="mf">0.998</span><span class="o">|</span>
<span class="o">-</span> <span class="n">Translation</span><span class="p">:</span> <span class="o"><</span><span class="n">x</span><span class="o">=</span><span class="mf">0.166</span> <span class="n">m</span><span class="p">,</span> <span class="n">y</span><span class="o">=</span><span class="mf">0.181</span> <span class="n">m</span><span class="p">,</span> <span class="n">z</span><span class="o">=</span><span class="mf">0.260</span> <span class="n">m</span><span class="o">></span>
<span class="o">*</span> <span class="n">Gaze</span> <span class="n">on</span> <span class="n">Screen</span><span class="p">:</span>
<span class="o">-</span> <span class="n">Lost</span> <span class="n">track</span><span class="p">:</span> <span class="kc">False</span>
<span class="o">-</span> <span class="n">Screen</span> <span class="n">ID</span><span class="p">:</span> <span class="mi">0</span>
<span class="o">-</span> <span class="n">Coordinates</span><span class="p">:</span> <span class="o"><</span><span class="n">x</span><span class="o">=</span><span class="mf">698.000</span> <span class="n">px</span><span class="p">,</span> <span class="n">y</span><span class="o">=</span><span class="mf">149.000</span> <span class="n">px</span><span class="o">></span>
<span class="o">-</span> <span class="n">Confidence</span><span class="p">:</span> <span class="n">TrackingConfidence</span><span class="o">.</span><span class="n">HIGH</span>
</pre></div>
</div>
<p>For the meaning of the returned fields, refer to the section <a class="reference internal" href="api_overview.html#api-overview"><span class="std std-ref">API overview</span></a>.</p>
</div>
</div>
<div class="section" id="explanation">
<h2>Explanation<a class="headerlink" href="#explanation" title="Permalink to this headline">¶</a></h2>
<p>When creating a Python script with the purpose of consuming head and eye tracking information from Beam SDK, you must ensure that the basic classes are correctly imported:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">eyeware.client</span> <span class="kn">import</span> <span class="n">TrackerClient</span>
</pre></div>
</div>
<p>We can build a <code class="docutils literal notranslate"><span class="pre">TrackerClient</span></code> object, which is the main entry point of Beam SDK (see <a class="reference internal" href="api_overview.html#api-overview"><span class="std std-ref">API overview</span></a> for further details):</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">tracker</span> <span class="o">=</span> <span class="n">TrackerClient</span><span class="p">()</span>
</pre></div>
</div>
<p>Then, we verify that the connection between our client object and the tracker server (Eyeware application) is up and running as follows:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="n">tracker</span><span class="o">.</span><span class="n">connected</span><span class="p">:</span>
</pre></div>
</div>
<p>and we are now ready to receive head and gaze tracking data, doing something with that data.</p>
<p>Let us start from the head tracking part.
First, we will retrieve the head tracking information data structure.
Then, we will check whether tracking information is valid for the current frame.
In code:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="nb">print</span><span class="p">(</span><span class="s2">" * Head Pose:"</span><span class="p">)</span>
<span class="n">head_pose</span> <span class="o">=</span> <span class="n">tracker</span><span class="o">.</span><span class="n">get_head_pose_info</span><span class="p">()</span>
<span class="n">head_is_lost</span> <span class="o">=</span> <span class="n">head_pose</span><span class="o">.</span><span class="n">is_lost</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" - Lost track: "</span><span class="p">,</span> <span class="n">head_is_lost</span><span class="p">)</span>
</pre></div>
</div>
<p>If the head tracking information is indeed valid (i.e., head tracking was <em>not lost</em>), then we retrieve the 3D coordinates of the tracked person’s head:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="ow">not</span> <span class="n">head_is_lost</span><span class="p">:</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" - Session ID: "</span><span class="p">,</span> <span class="n">head_pose</span><span class="o">.</span><span class="n">track_session_uid</span><span class="p">)</span>
<span class="n">rot</span> <span class="o">=</span> <span class="n">head_pose</span><span class="o">.</span><span class="n">transform</span><span class="o">.</span><span class="n">rotation</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" - Rotation: |</span><span class="si">%5.3f</span><span class="s2"> </span><span class="si">%5.3f</span><span class="s2"> </span><span class="si">%5.3f</span><span class="s2">|"</span> <span class="o">%</span> <span class="p">(</span><span class="n">rot</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">],</span> <span class="n">rot</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">],</span> <span class="n">rot</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">]))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" |</span><span class="si">%5.3f</span><span class="s2"> </span><span class="si">%5.3f</span><span class="s2"> </span><span class="si">%5.3f</span><span class="s2">|"</span> <span class="o">%</span> <span class="p">(</span><span class="n">rot</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">],</span> <span class="n">rot</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">],</span> <span class="n">rot</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">]))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" |</span><span class="si">%5.3f</span><span class="s2"> </span><span class="si">%5.3f</span><span class="s2"> </span><span class="si">%5.3f</span><span class="s2">|"</span> <span class="o">%</span> <span class="p">(</span><span class="n">rot</span><span class="p">[</span><span class="mi">2</span><span class="p">,</span> <span class="mi">0</span><span class="p">],</span> <span class="n">rot</span><span class="p">[</span><span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="p">],</span> <span class="n">rot</span><span class="p">[</span><span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">]))</span>
<span class="n">tr</span> <span class="o">=</span> <span class="n">head_pose</span><span class="o">.</span><span class="n">transform</span><span class="o">.</span><span class="n">translation</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" - Translation: <x=</span><span class="si">%5.3f</span><span class="s2"> m, y=</span><span class="si">%5.3f</span><span class="s2"> m, z=</span><span class="si">%5.3f</span><span class="s2"> m>"</span> <span class="o">%</span> <span class="p">(</span><span class="n">tr</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">tr</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">tr</span><span class="p">[</span><span class="mi">2</span><span class="p">]))</span>
</pre></div>
</div>
<p>For details about the rotation and translation notation, refer to the section <a class="reference internal" href="api_overview.html#api-overview"><span class="std std-ref">API overview</span></a>.</p>
<p>Now, we want to get screen gaze tracking information.
This follows the same logic that we applied for head tracking information.
First, retrieve the screen gaze information data structure.
Then, check the data validity (whether tracking is <em>not lost</em>):</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="nb">print</span><span class="p">(</span><span class="s2">" * Gaze on Screen:"</span><span class="p">)</span>
<span class="n">screen_gaze</span> <span class="o">=</span> <span class="n">tracker</span><span class="o">.</span><span class="n">get_screen_gaze_info</span><span class="p">()</span>
<span class="n">screen_gaze_is_lost</span> <span class="o">=</span> <span class="n">screen_gaze</span><span class="o">.</span><span class="n">is_lost</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" - Lost track: "</span><span class="p">,</span> <span class="n">screen_gaze_is_lost</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">screen_gaze_is_lost</span><span class="p">:</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" - Screen ID: "</span><span class="p">,</span> <span class="n">screen_gaze</span><span class="o">.</span><span class="n">screen_id</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" - Coordinates: <x=</span><span class="si">%5.3f</span><span class="s2"> px, y=</span><span class="si">%5.3f</span><span class="s2"> px>"</span> <span class="o">%</span> <span class="p">(</span><span class="n">screen_gaze</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="n">screen_gaze</span><span class="o">.</span><span class="n">y</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">" - Confidence: "</span><span class="p">,</span> <span class="n">screen_gaze</span><span class="o">.</span><span class="n">confidence</span><span class="p">)</span>
</pre></div>
</div>
<p>The rest of the example code is about printing head and gaze tracking data numbers on the terminal.
Printing those numbers, by itself, is not very useful or interesting.
Instead, you can exploit the Beam SDK tracking data for building your own creative applications!
Let us know how it goes at <a class="reference external" href="mailto:contact%40eyeware.tech">contact<span>@</span>eyeware<span>.</span>tech</a>.
We would love to hear about your projects.</p>
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