opencv笔记（三十）——opencv中滑动条的创建

深藏阁楼爱情的钟 2022-05-11 06:20 221阅读 0赞

![70][]

//注：调用滑杆时，显示滑杆的那张图的名字要和createTrackbar函数的第二个参数和onChangeTrackBar中imshow的名字相同
    #include <iostream>
    #include <opencv2\highgui\highgui.hpp>
    
    
    using namespace std;
    using namespace cv;
    
    const string Barname = "阈值";
    string window_name = "二值图";
    void onChangeTrackBar(int pos, void* usrdata);
    
    int main()
    {
    	Mat Image;
    	Mat Image_Gray;
    	int lowThreshold = 30;
    	int max_lowThreshold = 255;
    
    	Image = imread("E:\\QT text\\blood vessel processing\\Canny\\image\\11.bmp");
    	if (!Image.data) //判断图像是否载入
    	{
    		cout << "图像载入失败！" << endl;
    		return 0;
    	}
    //	imshow(window_name, Image);
    	cvtColor(Image, Image_Gray, CV_BGR2GRAY);
    	imshow(window_name, Image_Gray);
    	createTrackbar(Barname, window_name, &lowThreshold, max_lowThreshold, onChangeTrackBar, &Image_Gray);
    	waitKey(0);
    	return 0;
    }
    
    // 回调函数
    void onChangeTrackBar(int pos, void* usrdata)
    {
    	// 强制类型转换
    	Mat src = *(Mat*)(usrdata);
    
    	Mat dst;
    	// 二值化
    	threshold(src, dst, pos, 255, 0);
    
    	imshow(window_name, dst);
    }

### 注：调用滑杆时，滑杆所依附窗口的名字要和createTrackbar函数的第二个参数和onChangeTrackBar中imshow的名字相同。 ###

![70 1][]![70 2][]

参考：[https://blog.csdn.net/xiaowei\_cqu/article/details/7839140][https_blog.csdn.net_xiaowei_cqu_article_details_7839140]

[https://www.cnblogs.com/Nelsoner/p/6718842.html][https_www.cnblogs.com_Nelsoner_p_6718842.html]

[http://www.cnblogs.com/huhuuu/p/3538850.html][http_www.cnblogs.com_huhuuu_p_3538850.html]

[70]: /images/20220511/23cb3adfa9244a6bad1bc12f5416d5e8.png
[70 1]: https://img-blog.csdn.net/20180920172556497?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NzY0MTI5/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70
[70 2]: /images/20220511/5c895b66d0f44c8f9ccb844c4556bc28.png
[https_blog.csdn.net_xiaowei_cqu_article_details_7839140]: https://blog.csdn.net/xiaowei_cqu/article/details/7839140
[https_www.cnblogs.com_Nelsoner_p_6718842.html]: https://www.cnblogs.com/Nelsoner/p/6718842.html
[http_www.cnblogs.com_huhuuu_p_3538850.html]: http://www.cnblogs.com/huhuuu/p/3538850.html