r" href="#value"></a></h2>
    <p>A data frame with 2 columns:</p><dl><dt>"moment": </dt>
<dd><p>the name of the moment. See Note below.</p></dd>

   <dt>"value": </dt>
<dd><p>the value of the moment.</p></dd>


</dl></div>
    <div class="section level2">
    <h2 id="note">Note<a class="anchor" aria-label="anchor" href="#note"></a></h2>
    <p>The spatial moments \(m_{ji}\) are computed as:
 $$m_{ji}= \sum _{x,y} \left ( \texttt{contour} (x,y) \cdot x^j \cdot y^i \right )$$</p>
<p>The central moments \(\mu