opencv学习笔记（01）——操作图像的像素

 1 #include <opencv2\core\core.hpp>

 2 #include <opencv2\highgui\highgui.hpp>

 3 #include <opencv2\imgproc\imgproc.hpp>

 4 #include <iostream>

 5 

 6 

 7 void salt(cv::Mat& image, int n)

 8 {

 9 

10     for(int k=0; k<n; k++)

11     {

12 

13         int i = rand() % image.cols;        

14         int j = rand() % image.rows;        

15 

16         // 灰度图像

17         if(image.channels() == 1)

18         {

19             cv::Mat_<uchar> img = image;

20             img(j,i) = 255;            

21         }else{// 彩色图像 

22             cv::Mat_<cv::Vec3b> img = image;

23             //image.at<cv::Vec3b>(j,i)[0] = 255;            

24             //image.at<cv::Vec3b>(j,i)[1] = 255;            

25             //image.at<cv::Vec3b>(j,i)[2] = 255;            

26 

27             img(j,i)[0] = 255;            

28             img(j,i)[1] = 255;            

29             img(j,i)[2] = 255;            

30         }

31 

32     }

33 

34 }

35 

36 

37 int main(int argc, char** argv)

38 {

39 

40     cv::Mat img = cv::imread("F:\\images\\boldt.jpg");    

41     cv::Mat img2 = img.clone();    

42 

43     double duration;

44     duration = static_cast<double>(cv::getTickCount());

45 

46     salt(img, 3000);    

47 

48     duration = static_cast<double>(cv::getTickCount()) - duration;

49     duration /= cv::getTickFrequency();

50 

51     cv::namedWindow("original");    

52     cv::imshow("original", img);

53     cv::namedWindow("altered");    

54     cv::imshow("altered", img2);

55 

56     std::cout << duration << std::endl;

57 

58     cv::waitKey(0);

59     return 0;

60 

61 }