C++ 使用visual studio在opencv中运行人脸检测时出现错误LNK2019

我试着用一个代码从图像中检测人脸。我从网上尝试了以下示例代码

#include <opencv2/objdetect/objdetect.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <iostream>
#include <stdio.h>

using namespace std;
using namespace cv;

int main(int argc, const char** argv)
{
//create the cascade classifier object used for the face detection
CascadeClassifier face_cascade;
//use the haarcascade_frontalface_alt.xml library
face_cascade.load("haarcascade_frontalface_alt.xml");

//setup video capture device and link it to the first capture device
VideoCapture captureDevice;
captureDevice.open(0);

//setup image files used in the capture process
Mat captureFrame;
Mat grayscaleFrame;

//create a window to present the results
namedWindow("outputCapture", 1);

//create a loop to capture and find faces
while (true)
{
    //capture a new image frame
    captureDevice >> captureFrame;

    //convert captured image to gray scale and equalize
    cvtColor(captureFrame, grayscaleFrame, CV_BGR2GRAY);
    equalizeHist(grayscaleFrame, grayscaleFrame);

    //create a vector array to store the face found
    std::vector<Rect> faces;

    //find faces and store them in the vector array
    face_cascade.detectMultiScale(grayscaleFrame, faces, 1.1, 3, CV_HAAR_FIND_BIGGEST_OBJECT | CV_HAAR_SCALE_IMAGE, Size(30, 30));

    //draw a rectangle for all found faces in the vector array on the original image
    for (int i = 0; i < faces.size(); i++)
    {
        Point pt1(faces[i].x + faces[i].width, faces[i].y + faces[i].height);
        Point pt2(faces[i].x, faces[i].y);

        rectangle(captureFrame, pt1, pt2, cvScalar(0, 255, 0, 0), 1, 8, 0);
    }

    //print the output
    imshow("outputCapture", captureFrame);

    //pause for 33ms
    waitKey(33);
}
return 0;
}

目前我遇到以下错误：

错误1错误LNK2019:未解析的外部符号公共：_cdecl cv:：CascadeClassifier:：CascadeClassifiervoid？？0CascadeClassifier@cv@@QEAA@XZ在函数main中引用

需要帮助解决此问题。

cv:：CascadeClassifier:：CascadeClassifiervoid构造函数调用似乎不存在。请在此处查看openCV文档-

似乎是一个连接问题。检查您是否有类似的问题

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@ha9u63ar我只在iostream上试过，得到了上面的错误。我获取代码的网络示例中有stdio.h，因此仅使用它进行了尝试。不起作用[这是代码]链接正确吗？链接器选项是什么？也许这就是对你的问题@Sergey有效的答案！非常感谢..+1-代码将//创建用于人脸检测的级联分类器对象级联分类器face\u cascadehaarcascade\u frontalface\u alt.xml；