/span><span class="st">"objects_300dpi.jpg"</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="co"># Larger square: 10 x 10 cm</span></span></span>
<span class="r-in"><span><span class="co"># 1) Run the function calibrate()</span></span></span>
<span class="r-in"><span><span class="co"># 2) Use the left mouse button to create a line in the larger square</span></span></span>
<span class="r-in"><span><span class="co"># 3) Declare a known distance (10 cm)</span></span></span>
<