edges=<span class="string">'reflect1'</span>;
edges=<span class="string">'reflect2'</span>;
edges=<span class="string">'repeat'</span>;
edges=<span class="string">'extend'</span>;
edges=<span class="string">'zero'</span>;
edges=<span class="string">'circular'</span>;
edges=<span class="string">'dont-compute'</span>;

filt = mkImpulse(fsz,[1 1]);
showIm(corrDn(im,filt,edges));
line([0,0,imsz(2),imsz(2),0]+fmid(2)-0.5, <span class="keyword">...</span>
     [0,imsz(1),imsz(1),0,0]+fmid(1)-0.5);
title(sprintf(<