Hello everybody,

In following code I read in my webcam and want to detect face. Unfortunately it does not work. I commented some parts of the end out and I have NO problems only reading in the cam. But the whole code gives the error like below.

Here is the code:

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;

Mat detectFace(Mat src);

int main() { VideoCapture cap(0); namedWindow("window1", 1);

while (1)
{
    Mat frame;
    cap >> frame;
    frame = detectFace(frame);

    imshow("window1", frame);
    // Press 'c' to escape
    if (waitKey(1) == 'c') break;
}

waitKey(0);
return 0;

}

Mat detectFace(Mat image) { // Load Face cascade (.xml file) CascadeClassifier face_cascade("haarcascade_frontalface_alt2.xml");

// Detect faces
std::vector<Rect> faces;
face_cascade.detectMultiScale(image, faces, 1.1, 2, 0 | CV_HAAR_SCALE_IMAGE, Size(30, 30));

////// Draw circles on the detected faces
for (int i = 0; i < faces.size(); i++)
{
    Point center(faces[i].x + faces[i].width*0.5, faces[i].y + faces[i].height*0.5);
    ellipse(image, center, Size(faces[i].width*0.5, faces[i].height*0.5), 0, 0, 360, Scalar(255, 0, 255), 4, 8, 0);
}
return image;

}

This is the error message: OpenCV Error: Assertion failed (axes.width >= 0 && axes.height >= 0 && thickness <= 255 && 0 <= shift && shift <= XY_SHIFT) in cv::ellipse, file C:\builds\master_PackSlave-win32 -vc12-shared\opencv\modules\imgproc\src\drawing.cpp, line 1772

I am looking forward for your support and help. Thank you!

Hello everybody,

In following code I read in my webcam and want to detect face. Unfortunately it does not work. I commented some parts of the end out and I have NO problems only reading in the cam. But the whole code gives the error like below.

Here is the code:

#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;
 
cv;

Mat detectFace(Mat src);
 
src);

int main()
{
    VideoCapture cap(0);
    namedWindow("window1", 1);
 
1);

    while (1)
 {
     Mat frame;
     cap >> frame;
     frame = detectFace(frame);

     imshow("window1", frame);
     // Press 'c' to escape
     if (waitKey(1) == 'c') break;
 }

 waitKey(0);
 return 0;
 
}
 
}

Mat detectFace(Mat image)
{
    // Load Face cascade (.xml file)
    CascadeClassifier face_cascade("haarcascade_frontalface_alt2.xml");
 
face_cascade("haarcascade_frontalface_alt2.xml");

    // Detect faces
 std::vector<Rect> faces;
 face_cascade.detectMultiScale(image, faces, 1.1, 2, 0 | CV_HAAR_SCALE_IMAGE, Size(30, 30));

 ////// Draw circles on the detected faces
 for (int i = 0; i < faces.size(); i++)
 {
     Point center(faces[i].x + faces[i].width*0.5, faces[i].y + faces[i].height*0.5);
     ellipse(image, center, Size(faces[i].width*0.5, faces[i].height*0.5), 0, 0, 360, Scalar(255, 0, 255), 4, 8, 0);
 }
 return image;
}
 
} 
This is the error message:
message:
 
 OpenCV Error: Assertion failed (axes.width >= 0 && axes.height >= 0 && thickness <= 255 && 0 <= shift && shift <= XY_SHIFT) in cv::ellipse, file C:\builds\master_PackSlave-win32
-vc12-shared\opencv\modules\imgproc\src\drawing.cpp, line 1772
1772
 
I am looking forward for your support and help. Thank you!