OpenCV计算连通区域数目与最大连通区域并标示出

1. #include <stdio.h>
2. #include <cv.h>
3. #include <highgui.h>
5. #pragma comment(lib, "cv.lib")
6. #pragma comment(lib, "cxcore.lib")
7. #pragma comment(lib, "highgui.lib")
9. int main( int argc, char** argv )
10. {
11. IplImage* src = cvLoadImage(".\\wind.png", CV_LOAD_IMAGE_GRAYSCALE);
12. IplImage* dst = cvCreateImage(cvGetSize(src), 8, 3);
13. CvMemStorage* storage = cvCreateMemStorage(0);
14. CvSeq* contour = 0;
15. cvThreshold(src, src,120, 255, CV_THRESH_BINARY); // 二值化
16. cvNamedWindow("Source", 1);
17. cvShowImage("Source", src);
18. // 提取轮廓
19. int contour_num = cvFindContours(src, storage, &contour,sizeof(CvContour), CV_RETR_CCOMP, CV_CHAIN_APPROX_SIMPLE);
20. cvZero(dst); // 清空数组
21. CvSeq *_contour = contour;
22. double maxarea = 0;
23. double minarea = 100;
24. int m = 0;
25. for( ; contour != 0; contour = contour->h_next )
26. {
28. double tmparea = fabs(cvContourArea(contour));
29. if(tmparea < minarea)
30. {
31. cvSeqRemove(contour, 0); // 删除面积小于设定值的轮廓
32. continue;
33. }
34. CvRect aRect = cvBoundingRect( contour, 0 );
35. if ((aRect.width/aRect.height)<1)
36. {
37. cvSeqRemove(contour, 0); //删除宽高比例小于设定值的轮廓
38. continue;
39. }
40. if(tmparea > maxarea)
41. {
42. maxarea = tmparea;
43. }
44. m++;
45. // 创建一个色彩值
46. CvScalar color = CV_RGB( 0, 255, 255 );
48. //max_level 绘制轮廓的最大等级。如果等级为0，绘制单独的轮廓。如果为1，绘制轮廓及在其后的相同的级别下轮廓
49. //如果值为2，所有的轮廓。如果等级为2，绘制所有同级轮廓及所有低一级轮廓，诸此种种
50. //如果值为负数，函数不绘制同级轮廓，但会升序绘制直到级别为abs(max_level)-1的子轮廓
51. cvDrawContours(dst, contour, color, color, -1, 1, 8); //绘制外部和内部的轮廓
52. }
53. contour = _contour;
54. int count = 0;
55. for(; contour != 0; contour = contour->h_next)
56. {
57. count++;
58. double tmparea = fabs(cvContourArea(contour));
59. if (tmparea == maxarea)
60. {
61. CvScalar color = CV_RGB( 255, 0, 0);
62. cvDrawContours(dst, contour, color, color, -1, 1, 8);
63. }
64. }
65. printf("The total number of contours is:%d", count);
66. cvNamedWindow("Components", 1);
67. cvShowImage("Components", dst);
68. cvWaitKey(0);
69. cvDestroyWindow("Source");
70. cvReleaseImage(&src);
71. cvDestroyWindow("Components");
72. cvReleaseImage(&dst);
74. return 0;
75. }

#include <stdio.h>#include <cv.h>#include <highgui.h>#pragma comment(lib, "cv.lib")#pragma comment(lib, "cxcore.lib")#pragma comment(lib, "highgui.lib")int main( int argc, char** argv )  {IplImage* src = cvLoadImage(".\\wind.png", CV_LOAD_IMAGE_GRAYSCALE);IplImage* dst = cvCreateImage(cvGetSize(src), 8, 3);CvMemStorage* storage = cvCreateMemStorage(0);CvSeq* contour = 0;cvThreshold(src, src,120, 255, CV_THRESH_BINARY);// 二值化cvNamedWindow("Source", 1);cvShowImage("Source", src);// 提取轮廓int contour_num = cvFindContours(src, storage, &contour, sizeof(CvContour), CV_RETR_CCOMP, CV_CHAIN_APPROX_SIMPLE);cvZero(dst);// 清空数组CvSeq *_contour = contour; double maxarea = 0;double minarea = 100;int m = 0;for( ; contour != 0; contour = contour->h_next )  {  double tmparea = fabs(cvContourArea(contour));if(tmparea < minarea)   {  cvSeqRemove(contour, 0); // 删除面积小于设定值的轮廓continue;}  CvRect aRect = cvBoundingRect( contour, 0 ); if ((aRect.width/aRect.height)<1)  {  cvSeqRemove(contour, 0); //删除宽高比例小于设定值的轮廓continue;}  if(tmparea > maxarea)  {  maxarea = tmparea;}  m++;// 创建一个色彩值CvScalar color = CV_RGB( 0, 255, 255 );//max_level 绘制轮廓的最大等级。如果等级为0，绘制单独的轮廓。如果为1，绘制轮廓及在其后的相同的级别下轮廓//如果值为2，所有的轮廓。如果等级为2，绘制所有同级轮廓及所有低一级轮廓，诸此种种//如果值为负数，函数不绘制同级轮廓，但会升序绘制直到级别为abs(max_level)-1的子轮廓cvDrawContours(dst, contour, color, color, -1, 1, 8);//绘制外部和内部的轮廓}  contour = _contour;int count = 0;for(; contour != 0; contour = contour->h_next){  count++;double tmparea = fabs(cvContourArea(contour));if (tmparea == maxarea)  {  CvScalar color = CV_RGB( 255, 0, 0);cvDrawContours(dst, contour, color, color, -1, 1, 8);}  }  printf("The total number of contours is:%d", count);cvNamedWindow("Components", 1);cvShowImage("Components", dst);cvWaitKey(0);cvDestroyWindow("Source");cvReleaseImage(&src);cvDestroyWindow("Components");cvReleaseImage(&dst);return 0;}  

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