图像的轮廓检测

//图像的轮廓检测  

//By MoreWindows (http://blog.csdn.net/MoreWindows)  

#include <opencv2/opencv.hpp>  

using namespace std;  

#pragma comment(linker, "/subsystem:\"windows\" /entry:\"mainCRTStartup\"")  

int main( int argc, char** argv )  

{     

    const char *pstrWindowsSrcTitle = "原图(http://blog.csdn.net/MoreWindows)";  

    const char *pstrWindowsOutLineTitle = "轮廓图(http://blog.csdn.net/MoreWindows)";  

      

    const int IMAGE_WIDTH = 400;  

    const int IMAGE_HEIGHT = 200;  

  

    // 创建图像  

    IplImage *pSrcImage = cvCreateImage(cvSize(IMAGE_WIDTH, IMAGE_HEIGHT), IPL_DEPTH_8U, 3);  

    // 填充成白色  

    cvRectangle(pSrcImage, cvPoint(0, 0), cvPoint(pSrcImage->width, pSrcImage->height), CV_RGB(255, 255, 255), CV_FILLED);  

    // 画圆  

    CvPoint ptCircleCenter = cvPoint(IMAGE_WIDTH / 4, IMAGE_HEIGHT / 2);  

    int nRadius = 80;  

    cvCircle(pSrcImage, ptCircleCenter, nRadius, CV_RGB(255, 255, 0), CV_FILLED);  

    ptCircleCenter = cvPoint(IMAGE_WIDTH / 4, IMAGE_HEIGHT / 2);  

    nRadius = 30;  

    cvCircle(pSrcImage, ptCircleCenter, nRadius, CV_RGB(255, 255, 255), CV_FILLED);  

    // 画矩形  

    CvPoint ptLeftTop = cvPoint(IMAGE_WIDTH / 2 + 20, 20);  

    CvPoint ptRightBottom = cvPoint(IMAGE_WIDTH - 20, IMAGE_HEIGHT - 20);  

    cvRectangle(pSrcImage, ptLeftTop, ptRightBottom, CV_RGB(0, 255, 255), CV_FILLED);  

    ptLeftTop = cvPoint(IMAGE_WIDTH / 2 + 60, 40);  

    ptRightBottom = cvPoint(IMAGE_WIDTH - 60, IMAGE_HEIGHT - 40);  

    cvRectangle(pSrcImage, ptLeftTop, ptRightBottom, CV_RGB(255, 255, 255), CV_FILLED);  

    // 显示原图  

    cvNamedWindow(pstrWindowsSrcTitle, CV_WINDOW_AUTOSIZE);  

    cvShowImage(pstrWindowsSrcTitle, pSrcImage);  

  

  

    // 转为灰度图  

    IplImage *pGrayImage =  cvCreateImage(cvGetSize(pSrcImage), IPL_DEPTH_8U, 1);  

    cvCvtColor(pSrcImage, pGrayImage, CV_BGR2GRAY);  

    // 转为二值图  

    IplImage *pBinaryImage = cvCreateImage(cvGetSize(pGrayImage), IPL_DEPTH_8U, 1);  

    cvThreshold(pGrayImage, pBinaryImage, 250, 255, CV_THRESH_BINARY);  

  

  

    // 检索轮廓并返回检测到的轮廓的个数  

    CvMemStorage *pcvMStorage = cvCreateMemStorage();  

    CvSeq *pcvSeq = NULL;  

    cvFindContours(pBinaryImage, pcvMStorage, &pcvSeq, sizeof(CvContour), CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, cvPoint(0, 0));  

      

    // 画轮廓图  

    IplImage *pOutlineImage = cvCreateImage(cvGetSize(pSrcImage), IPL_DEPTH_8U, 3);  

    int nLevels = 5;  

    // 填充成白色  

    cvRectangle(pOutlineImage, cvPoint(0, 0), cvPoint(pOutlineImage->width, pOutlineImage->height), CV_RGB(255, 255, 255), CV_FILLED);  

    cvDrawContours(pOutlineImage, pcvSeq, CV_RGB(255,0,0), CV_RGB(0,255,0), nLevels, 2);  

    // 显示轮廓图  

    cvNamedWindow(pstrWindowsOutLineTitle, CV_WINDOW_AUTOSIZE);  

    cvShowImage(pstrWindowsOutLineTitle, pOutlineImage);  

  

  

    cvWaitKey(0);  

  

    cvReleaseMemStorage(&pcvMStorage);  

  

    cvDestroyWindow(pstrWindowsSrcTitle);  

    cvDestroyWindow(pstrWindowsOutLineTitle);  

    cvReleaseImage(&pSrcImage);  

    cvReleaseImage(&pGrayImage);  

    cvReleaseImage(&pBinaryImage);  

    cvReleaseImage(&pOutlineImage);  

    return 0;  

}