图像分割之最大连通域算法

CvSeq* contours = 0;   
CvMemStorage*  g_storage  = NULL;   
g_storage = cvCreateMemStorage(0);   
cvFindContours( m_image, g_storage, &contours, sizeof(CvContour), CV_RETR_EXTERNAL);
if(contours==NULL)  
return NULL; 
CvSeq* contourPos; 
CvRect bndRect = cvRect(0,0,0,0); 
double contourArea,maxcontArea=0; 
for( ; contours != 0; contours = contours->h_next ) 
{  
/*bndRect = cvBoundingRect( contours, 0 );  
contourArea=bndRect.width*bndRect.height;*/        
//与下面获取面积的方法大同小异  
contourArea = fabs(cvContourArea( contours, CV_WHOLE_SEQ ));  
if(contourArea>=maxcontArea)//提取最大轮廓  
{   
maxcontArea=contourArea;   
contourPos=contours;  
} 
}