opencv之cv::createTrackbar使用及代码实现

形式参数一、trackbarname:滑动空间的名称;

形式参数二、winname滑动空间用于依附的图像窗口的名称;

形式参数三、value初始化阈值;

形式参数四、count滑动控件的刻度范围;

形式参数五、TrackbarCallback是回调函数,其定义如下:

    typedef void (CV_CDECL *TrackbarCallback)(int pos, void* userdata);

使用及实现方法:

#include
#include


using namespace std;
using namespace cv;


Mat src, dst;
int vale = 0;
int max_value = 5;
RNG rng(12345);
void demo_puttext(int, void*);
int main(){
src = imread("D:/photo/5.jpg");
if (src.empty())
{
cout << "open no success" << endl;
return -1;
}
//创建窗口
namedWindow("show image", WINDOW_AUTOSIZE);
//创建滑块
createTrackbar("value", "show image", &vale, max_value, demo_puttext);
//主函数调用
demo_puttext(0,0);
//循环显示
waitKey(0);
return 0;
}
void demo_puttext(int, void*){
//模糊处理去噪声
blur(src, dst, Size(3,3), Point(-1,-1));
//定义随机颜色
Scalar color = Scalar(rng.uniform(0,255),rng.uniform(0,255),rng.uniform(0,255));
//进行条件执行
switch(vale){
case 0:
putText(dst, "0", Point(50,50), CV_FONT_HERSHEY_COMPLEX, 1, color);
break;
case 1:
putText(dst, "1", Point(50,50), CV_FONT_HERSHEY_COMPLEX, 1, color);
break;
case 2:
putText(dst, "2", Point(50,50), CV_FONT_HERSHEY_COMPLEX, 1, color);
break;
case 3:
putText(dst, "3", Point(50,50), CV_FONT_HERSHEY_COMPLEX, 1, color);
break;
case 4:
putText(dst, "4", Point(50,50), CV_FONT_HERSHEY_COMPLEX, 1, color);
break;
case 5:
putText(dst, "5", Point(50,50), CV_FONT_HERSHEY_COMPLEX, 1, color);
break;
}
//显示
imshow("show image", dst);

}

opencv之cv::createTrackbar使用及代码实现_第1张图片

opencv之cv::createTrackbar使用及代码实现_第2张图片


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