p></dd>


<dt id="arg-sep">sep<a class="anchor" aria-label="anchor" href="#arg-sep"></a></dt>
<dd><p>Regular expression to manage file names. The function combines in
the <code>merge</code> object the object measures (sum of area and mean of all the
other measures) of all images that share the same filename prefix, defined
as the part of the filename preceding the first hyphen (-) or underscore
(_) (no hyphen or underscore is required). For example, the measures of
images named <code>L1-1.jpeg</code>, <code