OpenCV中 RGB 轉換到 HSI空間

本文實現了RGB空間轉換到HSI空間，並分別求出S分量（飽和度）、I分量（亮度、光強）

1. #include "stdafx.h"
2. #include "highgui.h"
3. #include"cv.h"
5. int main(int argc, char *argv[])
6. {
7. IplImage *img = cvLoadImage("G:\\huo.jpg");
9. IplImage *r = cvCreateImage( cvGetSize(img), img->depth, 1);
10. IplImage *g = cvCreateImage( cvGetSize(img), img->depth, 1);
11. IplImage *b = cvCreateImage( cvGetSize(img), img->depth, 1);
14. CvMat *rmat = cvCreateMat( img->height, img->width, CV_32FC1);
15. CvMat *gmat = cvCreateMat( img->height, img->width, CV_32FC1);
16. CvMat *bmat = cvCreateMat( img->height, img->width, CV_32FC1);
17. CvMat *temp1 = cvCreateMat( img->height, img->width, CV_32FC1);
18. CvMat *temp2 = cvCreateMat( img->height, img->width, CV_32FC1);
19. CvMat *temp3 = cvCreateMat( img->height, img->width, CV_32FC1);
21. cvNamedWindow("saturation", 1);
22. cvNamedWindow("intensity", 1);
23. cvSplit( img, b, g, r, NULL);
24. cvConvert(b, bmat);
25. cvConvert(g, gmat);
26. cvConvert(r, rmat);
28. //計算飽和度S
30. cvMin( bmat, gmat, temp1);
31. cvMin( rmat, temp1, temp1);
32. cvAdd( bmat, gmat, temp2 );
33. cvAdd( temp2, rmat, temp2);
35. cvDiv( temp1, temp2, temp3, 765.0);
36. cvAbsDiffS( temp3, temp3, cvScalarAll( 255.0 ));
37. cvConvert( temp3, r );
40. //計算亮度I
43. cvAddWeighted( bmat, 1.0/3.0, rmat, 1.0/3.0, 0.0, bmat );
44. cvAddWeighted( bmat, 1.0, gmat, 1.0/3.0, 0.0, bmat);
45. cvConvert( bmat, g );
49. cvShowImage("saturation", r);
50. cvShowImage( "intensity", g);
51. cvWaitKey(0);
52. cvReleaseImage(&img);
53. cvDestroyWindow("saturation");
54. cvDestroyWindow("intensity");
57. return 0;
58. }