Question

如何处理trackbar回调参数，以使我的代码可以与键入为Mat的函数一起编译？

一些背景信息：函数rangeIN（）用于接收一些输入Mat并返回Mat。 openCV中的createTrackbar（）给我带来了一些麻烦，因为我不确定如何将参数与所使用的函数进行匹配。

这就是我现在要参考的内容：In OpenCV createTrackbar function what is the 6th paramter(User data) how it will be useful.(Please find the parameters in the explanation)

Mat rangeIN(const Mat& src_rangein) {
    Mat dst_HSV;
    int low_H = 0, low_S = 0, low_V = 0;
    int high_H = 0, high_S = 0, high_V = 0;

    cvtColor(src_rangein, dst_HSV, COLOR_BGR2HSV);
    inRange(dst_HSV, Scalar(low_H, low_S, low_V), Scalar(high_H, high_S, high_V), dst_HSV);
    namedWindow(window_capture_name);
    namedWindow(window_detection_name);

    // Trackbars to set thresholds for HSV values
    createTrackbar("Low H", window_detection_name, &low_H, max_value_H, rangeIN);                                   //"no instance of overloaded function  "rangeIN" matches the required type
    createTrackbar("High H", window_detection_name, &high_H, max_value_H, rangeIN);                                 //same problem? 
    createTrackbar("Low S", window_detection_name, &low_S, max_value, rangeIN);                                     //same problem?
    createTrackbar("High S", window_detection_name, &high_S, max_value, rangeIN);                                   //same problem?
    createTrackbar("Low V", window_detection_name, &low_V, max_value, rangeIN);                                     //same problem?
    createTrackbar("High V", window_detection_name, &high_V, max_value, rangeIN);                                   //same problem?

    imshow(window_capture_name, src_rangein);
    imshow(window_detection_name, dst_HSV);
    return dst_HSV;
}

我想这样做可以减少全局变量的使用。

当前尝试解决该问题的方法（可以运行，但仍具有全局int值）：

#include "opencv2/imgproc.hpp"
#include "opencv2/highgui.hpp"
#include <iostream>
using namespace cv;
const int max_value_H = 360 / 2;
const int max_value = 255;
const String window_capture_name = "Video Capture";
const String window_detection_name = "Object Detection";
int low_H = 0, low_S = 0, low_V = 0;
int high_H = max_value_H, high_S = max_value, high_V = max_value;

Mat rangeIN(const Mat & src_rangin) {
    Mat dst_rangein;
    cvtColor(src_rangin, dst_rangein, COLOR_BGR2HSV);
    inRange(dst_rangein, Scalar(low_H, low_S, low_V), Scalar(high_H, high_S, high_V), dst_rangein);
    namedWindow(window_capture_name);
    namedWindow(window_detection_name);

    imshow(window_capture_name, src_rangin);
    imshow(window_detection_name, dst_rangein);
    return dst_rangein;
}

void paraRangein(int, void*) {

    createTrackbar("Low H", window_detection_name, &low_H, max_value_H, paraRangein);
    createTrackbar("High H", window_detection_name, &high_H, max_value_H, paraRangein);
    createTrackbar("Low S", window_detection_name, &low_S, max_value, paraRangein);
    createTrackbar("High S", window_detection_name, &high_S, max_value, paraRangein);
    createTrackbar("Low V", window_detection_name, &low_V, max_value, paraRangein);
    createTrackbar("High V", window_detection_name, &high_V, max_value, paraRangein);
    waitKey();

}

int main(int argc, char* argv[])
{
    Mat src = imread("kid.jpg");

    while (1) {
    rangeIN(src);
    paraRangein(0, 0);

    }
    waitKey();
    return 0;
}

编辑：当前可能是我写过的最糟糕的结构化程序。如果有人可以在评论中激发想法，这可能有助于产生更好的解决方案。

如果这是一个合理的答案，请@@ Tas。 “您可以使用一个中间函数，然后将该函数调用Mat someFunction。但是您无法将值返回到cv :: createTrackbar。您可能需要详细说明自己在做什么。另请参见How to successfully pass a functional object (or lambda) to the trackbar callback second argument (void*)? “

openCV C ++“ createTrackbar”，回调函数参数。回调函数的类型重要吗？

0 个答案: