OpenCV错误：断言失败< scn == 3 :: scn == 4>在未知函数中， [英] OpenCV Error: Assertion failed <scn == 3 ::scn == 4> in unknown function,

问题描述

我从其他解决方案中读了很多，但我仍然困惑我应该怎么做我的...

I read alot from other solution but i still confused what should i do with mine...

#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;
}

这是错误

OpenCV错误：未知函数中的断言失败

OpenCV Error: Assertion failed in unknown function

看起来错误发生在captureDevice> > captureFrame;请指导我，这是从相机拍摄的图像。

It seems the error happened after "captureDevice >> captureFrame;" Please guide me, this is taking image from camera.

推荐答案

看起来像 VideoCapture 无法从您的相机抓取帧。添加此代码以检查框架抓取的结果：

It seems like VideoCapture can't grab frame from your camera. Add this code to check result of frame grabbing:

//create a loop to capture and find faces
while (true)
{
    //capture a new image frame
    captureDevice >> captureFrame;
    if (captureFrame.empty())
    {
        cout << "Failed to grab frame" << endl;
        break;
    }
    ...

如果是 VideoCapture 检查您是否为相机安装了驱动程序。

If it is a problem of VideoCapture check that you installed drivers for your camera.

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