OpenCV 教程 02 : 创建滑块

示例代码

回调函数方式

#include <opencv2/opencv.hpp>
#include <iostream>

using namespace cv;

void onTrackbarClicked(int value, void* image)
{
    imshow("原图", *(Mat*)image);
    std::cout << "value = " << value << std::endl;
}

int main(int argc, char const *argv[])
{
    Mat image = imread("1.jpg");
    namedWindow("原图");

    // 创建滑动条，会根据窗口名称自动匹配
    createTrackbar("大小", "原图", 0, 300, onTrackbarClicked, &image);
    waitKey(0);

    return 0;
}

非回调函数方式

#include <opencv2/opencv.hpp>
#include <iostream>

using namespace cv;

int main(int argc, char const *argv[])
{
    Mat image = imread("1.jpg");
    namedWindow("原图");
    createTrackbar("大小", "原图", 0, 300, 0);

    while(waitKey(100) != 27) {
        // 获取滑块位置值
        int value = getTrackbarPos("大小", "原图");
        imshow("原图", image);
        std::cout << "value = " << value << std::endl;
    }

    return 0;
}

运行结果