perfTune: use bwconncomp instead of find

matlab/+Segment/frameSegment.m

@@ -137,8 +137,9 @@ if ~is3D(im)
         fprintf(2,'ACK frameSegment: boundaries and num components !=\n');
     end
 end
+CC=bwconncomp(L);
 for n=1:num
-    idx=find(L==n);   
+    idx=CC.PixelIdxList{n};   
     if length(idx)<area_min|| max(d(idx))<dmin
         continue
     end