C++ OpenCV 颜色检测程序中未处理的异常

Question

我正在尝试在 Visual Studio 中创建一个程序来检测黑白视频剪辑中的颜色。这是我的代码：

#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc.hpp>


using namespace std;
using namespace cv;

int main(int argc, char** argv)
{
    //Load clip
    VideoCapture cap("C:/Users/nicho/Videos/ThermalClip1.mp4");
    //Note: location of video file on current computer may differ from initial code. Change accordingly

    //If clip cannot be loaded, exit program
    if (cap.isOpened() == false)
    {
        cout << "Error. Cannot open video file" << endl;
        cin.get();
        return -1;
    }

    namedWindow("Control", WINDOW_AUTOSIZE);//Create control window

    int hLowVal = 0;//initial hue value (lower)
    int hUpVal = 179;//initial hue value (upper)

    int hSatLow = 0;//initial saturation (lower)
    int hSatUp = 255; //initial saturation (upper)

    int valueLower = 0;
    int valueUpper = 255;

    //Create trackbars for control window
    createTrackbar("Lower Hue", "Adjust", &hLowVal, 179);
    createTrackbar("Increase Hue", "Adjust", &hUpVal, 179);
    createTrackbar("Lower Saturation", "Adjust", &hSatLow, 255);
    createTrackbar("Increase Saturation", "Adjust", &hSatUp, 255);
    createTrackbar("Lower Value", "Adjust", &valueLower, 255);
    createTrackbar("Increase Value", "Adjust", &valueUpper, 255);

    while (1)
    {
        //Load actual image
        Mat actualImage;
        bool temp = cap.read(actualImage);


        //Store converted image
        Mat convertToHSV;
        cvtColor(actualImage, convertToHSV, COLOR_BGR2HSV);

        //Matrix for window where thermal spot will be detected
        Mat detectionScreen;
        inRange(convertToHSV, Scalar(hLowVal, hSatLow, valueLower), Scalar(hUpVal, hSatUp, valueUpper), detectionScreen);

        //remove small objects from foreground
        erode(detectionScreen, detectionScreen, getStructuringElement(MORPH_ELLIPSE, Size(5, 5)));
        dilate(detectionScreen, detectionScreen, getStructuringElement(MORPH_ELLIPSE, Size(5, 5)));

        //fill up small holes in foreground
        dilate(detectionScreen, detectionScreen, getStructuringElement(MORPH_ELLIPSE, Size(5, 5)));
        erode(detectionScreen, detectionScreen, getStructuringElement(MORPH_ELLIPSE, Size(5, 5)));

        //Show the thermal spot
        imshow("Thermal Spot detected", detectionScreen);

        imshow("Original Image", detectionScreen);

        if (waitKey(30) == 27)//If escape key is pressed, break loop
        {
            break;
        }
    }
    
    return 0;
}

问题出在这行代码：

createTrackbar("Lower Hue", "Adjust", &hLowVal, 179);

当我尝试运行它时，它出现了以下错误消息：

错误：0x00007FFD5B4E4C3C 处出现未处理的异常 ThermalSpotDetector.exe：Microsoft C++ 异常：cv::Exception at 内存位置 0x000000BA269DD5C0

有人知道发生了什么事吗？

Answer 1

正如您在

cv::createTrackbar

文档中看到的那样， 第二个参数
winname

是：

将用作父窗口的窗口的名称 创建了轨迹栏。

当您通过调用

cv::namedWindow

创建窗口时：

namedWindow("Control", WINDOW_AUTOSIZE); 您使用了名称

"Control"

（调用中的第一个参数），这应该是窗口名称。

因此您应该将第一个

createTrackbar

 呼叫更改为：

//--------------------------vvvvvvvv----------------
createTrackbar("Lower Hue", "Control", &hLowVal, 179);

所有其他

createTrackbar

 呼叫也是如此。