在OpenCV中鼠標移動區域局部放大

這個程序類似於淘寶購物時，在商品圖像上移動鼠標，會出現一個放大鼠標周圍矩形區域內的局部圖像的窗口。話不多說，直接貼代碼。

1. #include <cv.h>
2. #include <highgui.h>
3. #include <stdio.h>
4. #pragma comment( lib, "cv.lib" )
5. #pragma comment( lib, "cxcore.lib" )
6. #pragma comment( lib, "highgui.lib" )
7. IplImage* org = 0;
8. IplImage* img = 0;
9. IplImage* dst = 0;
10. int foo=60;
11. void on_mouse( int event, int x, int y, int flags, void* ustc)
12. {
13. if( event == CV_EVENT_MOUSEMOVE && !(flags & CV_EVENT_FLAG_LBUTTON))
14. {
15. cvCopy(org,img);
16. CvPoint p0;
17. CvPoint p1;
18. if(x<foo)
19. {
20. if(y<foo)
21. {
22. p0=cvPoint(0,0);
23. p1=cvPoint(2*foo,2*foo);
24. }
25. else if(y>img->height-foo)
26. {
27. p0=cvPoint(0,img->height-2*foo);
28. p1=cvPoint(2*foo,img->height);
29. }
30. else
31. {
32. p0=cvPoint(0,y-foo);
33. p1=cvPoint(2*foo,y+foo);
34. }
35. }
36. else if(x>img->width-foo)
37. {
38. if(y<foo)
39. {
40. p0=cvPoint(img->width-2*foo,0);
41. p1=cvPoint(img->width,2*foo);
42. }
43. else if(y>img->height-foo)
44. {
45. p0=cvPoint(img->width-2*foo,img->height-2*foo);
46. p1=cvPoint(img->width,img->height);
47. }
48. else
49. {
50. p0=cvPoint(img->width-2*foo,y-foo);
51. p1=cvPoint(img->width,y+foo);
52. }
53. }
54. else
55. {
56. if(y<foo)
57. {
58. p0=cvPoint(x-foo,0);
59. p1=cvPoint(x+foo,2*foo);
60. }
61. else if(y>img->height-foo)
62. {
63. p0=cvPoint(x-foo,img->height-2*foo);
64. p1=cvPoint(x+foo,img->height);
65. }
66. else
67. {
68. p0=cvPoint(x-foo,y-foo);
69. p1=cvPoint(x+foo,y+foo);
70. }
71. }
72. cvRectangle(img,p0,p1,CV_RGB(0,255,0));
73. cvSetImageROI(org,cvRect(p0.x,p0.y,p1.x-p0.x,p1.y-p0.y));
74. cvResize(org,dst);
75. cvResetImageROI(org);
76. cvShowImage( "img", img );
77. cvShowImage("dst",dst);
78. }
79. }
80. int main()
81. {
82. org=cvLoadImage("lena.jpg",1);
83. img=cvCloneImage(org);
84. dst=cvCreateImage(cvSize(foo*4,foo*4),org->depth,org->nChannels);
85. cvNamedWindow("img",1);
86. cvSetMouseCallback( "img", on_mouse, 0 );
87. cvShowImage("img",img);
88. cvNamedWindow("dst",1);
89. cvWaitKey(0);
90. cvDestroyAllWindows();
91. cvReleaseImage(&org);
92. cvReleaseImage(&img);
93. cvReleaseImage(&dst);
94. return 0;
95. }

效果圖如下