图像连通域的标定（OpenCv版）

1. [图片] 图像连通域的标定（OpenCv版）    

2. [图片] 图像连通域的标定（OpenCv版）    

3. [代码][C/C++]代码 

#include "cv.h"
#include "cxcore.h"
#include "highgui.h"
 
int main( int argc, char** argv )
{
	//声明IplImage指针
	IplImage* pImg = cvLoadImage("e:/black.jpg",0); 
	IplImage* pContourImg = NULL;
	CvMemStorage * storage = cvCreateMemStorage(0);
	CvSeq * contour = 0;
	CvSeq *contmax = 0;
	int mode = CV_RETR_EXTERNAL;
	cvShowImage( "src", pImg );
	//为轮廓显示图像申请空间
	//3通道图像，以便用彩色显示
	pContourImg = cvCreateImage(cvGetSize(pImg),IPL_DEPTH_8U,3);
	//copy source image and convert it to BGR image
	cvCvtColor(pImg, pContourImg, CV_GRAY2BGR);
	//查找contour
	cvFindContours( pImg, storage, &contour, sizeof(CvContour), mode, CV_CHAIN_APPROX_SIMPLE, cvPoint(0,0));
	//将轮廓画出    
	cvDrawContours(pContourImg, contour,CV_RGB(255,0,0), CV_RGB(255, 0, 0), 2, 2, 8, cvPoint(0,0));
	int area,maxArea = 10;//设面积最大值大于10Pixel
	for(;contour;contour = contour->h_next)
	{
		area = fabs(cvContourArea( contour, CV_WHOLE_SEQ )); //获取当前轮廓面积
		printf("area == %lf\n", area);
		if(area > maxArea)
		{
			contmax = contour;
			maxArea = area;
		}
	}
	CvRect aRect = cvBoundingRect( contmax, 0 );
	cvSetImageROI( pContourImg,aRect);
	//显示图像
	cvShowImage( "contour", pContourImg );
	cvSaveImage("e:/contour.jpg",pContourImg);
	cvWaitKey(0);

	//销毁窗口
	cvDestroyWindow( "src" );
	cvDestroyWindow( "contour" );
	//释放图像
	cvReleaseImage( &pImg ); 
	cvReleaseImage( &pContourImg ); 
	cvReleaseMemStorage(&storage);

	return 0;
}