opencv--图像轮廓检测

时间：2023-03-08 20:11:37
//图像的轮廓检测上

//By MoreWindows (http://blog.****.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.****.net/MoreWindows)";

	const char *pstrWindowsOutLineTitle = "轮廓图(http://blog.****.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;

}

　　

相关文章