Require nThreads to be a sane value

Author: cactorium

library/ComponentLabeling.cpp

@@ -32,6 +32,7 @@ void myCompLabeler::Label()
 	w = binaryImage.size().width;
 	CBlobContour* label=NULL;
 	for(r=startPoint.y;r<endPoint.y;r++){
+    printf("%d\n", r);
 		//First col
 		pos = r*w;
 		c=startPoint.x;
@@ -454,6 +455,9 @@ myCompLabelerGroup::~myCompLabelerGroup()
 
 void myCompLabelerGroup::set( int nThreads, Mat binIm )
 {
+  if (nThreads <= 0) {
+    nThreads = 1;
+  }
 	this->numThreads=nThreads;
 	if(binIm.isContinuous()){
 		this->img=binIm;
@@ -478,7 +482,7 @@ void myCompLabelerGroup::set( int nThreads, Mat binIm )
 		delete []labelers;
 	}
 	tIds = new pthread_t[nThreads];
-	labelers = new myCompLabeler*[nThreads];
+	labelers = new myCompLabeler*[nThreads > 0? nThreads : 1];
 	Size sz = binIm.size();
 	int numPx = sz.width*sz.width;
 	int i=0;