Fixed bug in cvLabel. First point count twice in blog parameters calc…

…ulation.

ChangeLog

@@ -3,6 +3,9 @@ Version 0.10.4 (2011/01/26)
   * CMakeLists.txt, cvBlobConfig.cmake.in: create "cvBlobConfig.cmake" for
   easy integration with CMAKE projects. Thanks to zorzalzilba.
 
+  * cvlabel.cpp: fix bug in the function cvLabel by which it calculates area
+  off by one.
+
 Version 0.10.3 (2010/11/12)
 
   * cvlabel.cpp: a little optimization in "cvLabel".

cvBlob/cvlabel.cpp

@@ -170,18 +170,21 @@ namespace cvb
 		    direction=(direction+1)%4;
 		  else
 		  {
-		    imageOut(xx, yy) = label;
-		    numPixels++;
-
-		    if (xx<blob->minx) blob->minx = xx;
-		    else if (xx>blob->maxx) blob->maxx = xx;
-		    if (yy<blob->miny) blob->miny = yy;
-		    else if (yy>blob->maxy) blob->maxy = yy;
-
-		    blob->area++;
-		    blob->m10+=xx; blob->m01+=yy;
-		    blob->m11+=xx*yy;
-		    blob->m20+=xx*xx; blob->m02+=yy*yy;
+		    if (imageOut(xx, yy) != label)
+		    {
+		      imageOut(xx, yy) = label;
+		      numPixels++;
+
+		      if (xx<blob->minx) blob->minx = xx;
+		      else if (xx>blob->maxx) blob->maxx = xx;
+		      if (yy<blob->miny) blob->miny = yy;
+		      else if (yy>blob->maxy) blob->maxy = yy;
+
+		      blob->area++;
+		      blob->m10+=xx; blob->m01+=yy;
+		      blob->m11+=xx*yy;
+		      blob->m20+=xx*xx; blob->m02+=yy*yy;
+		    }
 
 		    break;
 		  }