OpenCV之图像轮廓检测及提取

代码功能：检测并画出图像中的轮廓

主要函数：cvFindContours、cvDrawContours

1 #include <cv.h>

2 #include <highgui.h>

3 #include <cxcore.h>

4 #include <iostream.h>

5

6 void main()

7 {

8 int i=0;

9 int mode=CV_RETR_CCOMP; //the mode of contours

10 int num_contours=0;

11 CvScalar ext_color,inn_color;

12

13 CvMemStorage*storage=cvCreateMemStorage(0);

14 CvSeq*contour=0;

15

16 IplImage*pimg=NULL;

17 IplImage*CTImg=NULL;

18 IplImage*src=cvLoadImage("test.bmp",-1);

19

20 pimg=cvCreateImage(cvGetSize(src),src->depth,1);

21 CTImg=cvCreateImage(cvGetSize(pimg),IPL_DEPTH_8U,3);

22 cvCvtColor(src,pimg,CV_BGR2GRAY);

23

24 cvNamedWindow("source",CV_WINDOW_AUTOSIZE);

25 cvNamedWindow("gray",CV_WINDOW_AUTOSIZE);

26 cvNamedWindow("contours",CV_WINDOW_AUTOSIZE);

27

28 cvShowImage("source",src);

29 //cvThreshold(pimg,pimg,200,250,CV_THRESH_BINARY);

30 cvErode(pimg,pimg,0,1);

31 cvDilate(pimg,pimg,0,1);

32 cvCanny(pimg,pimg,2,20,3);

33 //cvErode(pimg,pimg,0,2);

34 //cvDilate(pimg,pimg,0,1);

35 //Find the Contours

36 mode=CV_RETR_LIST;

37 num_contours=cvFindContours(pimg,storage,&contour,sizeof(CvContour),mode,CV_CHAIN_APPROX_NONE);

38 cout<<"The number of the contours is :"<<num_contours<<endl;

39 //Draw the Contours

40 for (;contour!=0;contour=contour->h_next)

41 {

42 inn_color=CV_RGB(rand()&255,rand()&255,rand()&255);

43 ext_color=CV_RGB(rand()&255,rand()&255,rand()&255);

44 cvDrawContours(CTImg,contour,ext_color,inn_color,1,2,8,cvPoint(0,0));

45 }

46

47 cvShowImage("gray",pimg);

48 cvShowImage("contours",CTImg);

49 cvWaitKey(0);

50 cvSaveImage("Contours.bmp",CTImg);

51 cvSaveImage("Canny.bmp",pimg);

52

53 cvReleaseImage(&pimg);

54 cvReleaseImage(&CTImg);

55 cvReleaseImage(&src);

56 cvReleaseMemStorage(&storage);

57

58 cvDestroyAllWindows();

59

60 }
效果图：