学OpenCV

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颜色模型之间可以互相转换

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 1 #include <iostream>
 2 
 3 #include <opencv2/opencv.hpp>
 4 #include <opencv2/core/utils/logger.hpp>
 5 
 6 #include <vector>
 7 #include <string>
 8 
 9 void Test1()
10 {
11     cv::Mat img;
12     img = cv::imread(R"(C:\testNoGit\learnOpenCV4-master\data\lena.png)");
13     if (img.empty())
14     {
15         std::cout << "请确认图像文件名是否正确" << std::endl;
16         return ;
17     }
18 
19     std::vector<cv::Mat> vctMatChannel;
20     cv::split(img, vctMatChannel);
21 
22     int num = vctMatChannel.size();
23 
24     for (int i = 0; i < num; i++)
25     {
26         std::string strCaption = std::string("Test1 channel ") + std::to_string(i);
27         
28         cv::imshow(strCaption, vctMatChannel[i]);
29     }
30 
31     cv::Mat mat0 = cv::Mat::zeros(img.rows, img.cols,CV_8UC1);
32     vctMatChannel[0] = mat0;//BGR
33     vctMatChannel[1] = mat0;//BGR
34     cv::Mat mat00R;
35     cv::merge(vctMatChannel, mat00R);
36     cv::imshow("Test1 00R", mat00R);
37 
38     vctMatChannel.push_back(mat0);
39     cv::Mat mat00R0;
40     cv::merge(vctMatChannel, mat00R0);
41     cv::imshow("Test1 00R0", mat00R0);
42 
43     vctMatChannel.push_back(mat0);
44     cv::Mat mat00R00;
45     cv::merge(vctMatChannel, mat00R00);
46     //cv::imshow("Test1 00R00", mat00R00);//imshow崩溃。因为通常RGBA最多是4通道，因此多于4通道崩溃。
47 }
48 
49 void Test2()
50 {
51     cv::Mat img;
52     img = cv::imread(R"(C:\testNoGit\learnOpenCV4-master\data\lena.png)");
53     if (img.empty())
54     {
55         std::cout << "请确认图像文件名是否正确" << std::endl;
56         return;
57     }
58 
59     int num =img.channels();
60     cv::Mat* arrMatChannel = new cv::Mat[num];
61     cv::split(img, arrMatChannel);
62 
63 
64     for (int i = 0; i < num; i++)
65     {
66         std::string strCaption = std::string("Test2 channel ") + std::to_string(i);
67 
68         cv::imshow(strCaption, arrMatChannel[i]);
69     }
70 
71     cv::Mat mat0 = cv::Mat::zeros(img.rows, img.cols, CV_8UC1);
72     arrMatChannel[0] = mat0;//BGR
73     arrMatChannel[1] = mat0;//BGR
74     cv::Mat mat00R;
75     cv::merge(arrMatChannel,num, mat00R);
76     cv::imshow("Test2 00R", mat00R);
77 }
78 
79 int main()
80 {
81     cv::utils::logging::setLogLevel(cv::utils::logging::LOG_LEVEL_ERROR);
82     
83     Test1();
84     Test2();
85 
86     cv::waitKey(0);
87 
88     return 0;
89 }

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查看效果

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多于4通道无法用imshow查看，可以在image show里以数据的形式查看