OpenCV 为程序界面添加滑动条

 

#include <cv.h>
#include <highgui.h>

using namespace cv;

/// 全局变量的声明与初始化
const int alpha_slider_max = 100;
int alpha_slider;
double alpha;
double beta;

/// 声明存储图像的变量
Mat src1;
Mat src2;
Mat dst;

/**
 * @function on_trackbar
 * @定义响应滑动条的回调函数
 */
void on_trackbar( int, void* )
{
 alpha = (double) alpha_slider/alpha_slider_max ;
 beta = ( 1.0 - alpha );

 addWeighted( src1, alpha, src2, beta, 0.0, dst);

 imshow( "Linear Blend", dst );
}

int main( int argc, char** argv )
{
 /// 加载图像 (两图像的大小与类型要相同)
 src1 = imread("../../images/LinuxLogo.jpg");
 src2 = imread("../../images/WindowsLogo.jpg");

 if( !src1.data ) { printf("Error loading src1 \n"); return -1; }
 if( !src2.data ) { printf("Error loading src2 \n"); return -1; }

 /// 初始化为零
 alpha_slider = 0;

 /// 创建窗体
 namedWindow("Linear Blend", 1);

 /// 在创建的窗体中创建一个滑动条控件
 char TrackbarName[50];
 sprintf( TrackbarName, "Alpha x %d", alpha_slider_max );

 createTrackbar( TrackbarName, "Linear Blend", &alpha_slider, alpha_slider_max, on_trackbar );

 /// 结果在回调函数中显示
 on_trackbar( alpha_slider, 0 );

 /// 按任意键退出
 waitKey(0);
 return 0;
}