利用OpenCV計算圖像的垂直和水平積分投影

代碼：

1. #include <cv.h>
2. #include <highgui.h>
3. #pragma comment( lib, "cv.lib" )
4. #pragma comment( lib, "cxcore.lib" )
5. #pragma comment( lib, "highgui.lib" )
6. int main()
7. {
8. IplImage * src=cvLoadImage("lena.jpg",0);
9. // cvSmooth(src,src,CV_BLUR,3,3,0,0);
10. cvThreshold(src,src,50,255,CV_THRESH_BINARY_INV);
11. IplImage* paintx=cvCreateImage( cvGetSize(src),IPL_DEPTH_8U, 1 );
12. IplImage* painty=cvCreateImage( cvGetSize(src),IPL_DEPTH_8U, 1 );
13. cvZero(paintx);
14. cvZero(painty);
15. int* v=new int[src->width];
16. int* h=new int[src->height];
17. memset(v,0,src->width*4);
18. memset(h,0,src->height*4);
20. int x,y;
21. CvScalar s,t;
22. for(x=0;x<src->width;x++)
23. {
24. for(y=0;y<src->height;y++)
25. {
26. s=cvGet2D(src,y,x);
27. if(s.val[0]==0)
28. v[x]++;
29. }
30. }
32. for(x=0;x<src->width;x++)
33. {
34. for(y=0;y<v[x];y++)
35. {
36. t.val[0]=255;
37. cvSet2D(paintx,y,x,t);
38. }
39. }
41. for(y=0;y<src->height;y++)
42. {
43. for(x=0;x<src->width;x++)
44. {
45. s=cvGet2D(src,y,x);
46. if(s.val[0]==0)
47. h[y]++;
48. }
49. }
50. for(y=0;y<src->height;y++)
51. {
52. for(x=0;x<h[y];x++)
53. {
54. t.val[0]=255;
55. cvSet2D(painty,y,x,t);
56. }
57. }
58. cvNamedWindow("二值圖像",1);
59. cvNamedWindow("垂直積分投影",1);
60. cvNamedWindow("水平積分投影",1);
61. cvShowImage("二值圖像",src);
62. cvShowImage("垂直積分投影",paintx);
63. cvShowImage("水平積分投影",painty);
64. cvWaitKey(0);
65. cvDestroyAllWindows();
66. cvReleaseImage(&src);
67. cvReleaseImage(&paintx);
68. cvReleaseImage(&painty);
69. return 0;
70. }

下面是代碼運行的結果：