图像亮度、对比度调节

1. #include"cv.h"
2. #include"highgui.h"
3. #include<stdio.h>
4. intImageAdjust(IplImage*src,IplImage*dst,
5. doublelow,doublehigh,//xdirection
6. doublebottom,doubletop,//ydirection
7. doublegamma);
8. intmain(void)
9. {
10. char*filename="lena.jpg";
11. IplImage*dst,*src=/blog.armyourlife.info/cvLoadImage(filename,0);
12. if(!src)
13. {
14. printf("Couldn'tseemtoOpen%s,sorry\n",filename);
15. return-1;
16. }
18. cvNamedWindow("src",1);
19. cvNamedWindow("result",1);
21. //Imageadjust
22. dst=cvCloneImage(src);
23. //输入参数[0,0.5]和[0.5,1],gamma=1
24. if(ImageAdjust(src,dst,0,0.5,0.5,1,1)!=0)
25. return-1;
27. cvShowImage("src",src);
28. cvShowImage("result",dst);
29. cvWaitKey(0);
30. cvDestroyWindow("src");
31. cvDestroyWindow("result");
32. cvReleaseImage(&src);
33. cvReleaseImage(&dst);
35. return0;
36. }
37. intImageAdjust(IplImage*src,IplImage*dst,
38. doublelow,doublehigh,//X方向：lowandhigharetheintensitiesofsrc
39. doublebottom,doubletop,//Y方向：mappedtobottomandtopofdst
40. doublegamma)
41. {
42. doublelow2=low*255;
43. doublehigh2=high*255;
44. doublebottom2=bottom*255;
45. doubletop2=top*255;
46. doubleerr_in=high2-low2;
47. doubleerr_out=top2-bottom2;
48. intx,y;
49. doubleval;
50. if(low<0&&low>1&&high<0&&high>1&&
51. bottom<0&&bottom>1&&top<0&&top>1&&low>high)
52. return-1;
53. //intensitytransform
54. for(y=0;y<src->height;y++)
55. {
56. for(x=0;x<src->width;x++)
57. {
58. val=((uchar*)(src->imageData+src->widthStep*y))[x];
59. val=pow((val-low2)/err_in,gamma)*err_out+bottom2;
60. if(val>255)
61. val=255;
62. if(val<0)
63. val=0;//Makesuresrcisintherange[low,high]
64. ((uchar*)(dst->imageData+dst->widthStep*y))[x]=(uchar)val;
65. }
66. }
67. return0;
68. }