Question

我尝试在opencv上创建一个用于眼睛跟踪的程序。然而，程序经常崩溃没有明显的原因，特别是当我用手遮住右眼时。我使用代码块和opencv 2.4.5

using namespace std;
using namespace cv;

int lar,hau;
Rect rect;
Mat copie_frame;
Mat carre;
Mat YCR;
Mat eye(lar,hau,CV_8UC1);

/** Function Headers */
void detectAndDisplay( Mat frame );
void eyestreatment (Mat carre);
/** Global variables */
String face_cascade_name = "haarcascade_frontalface_alt.xml";
String eyes_cascade_name = "haarcascade_eye_tree_eyeglasses.xml";
CascadeClassifier face_cascade;
CascadeClassifier eyes_cascade;

string window_name = "Capture - Face detection";
RNG rng(12345);

/** @function main */
int main( int argc, const char** argv )
{
    CvCapture* capture;
    Mat frame;

    //-- 1. Load the cascades
    if( !face_cascade.load( face_cascade_name ) ){
        printf("--(!)Error loading\n");
        return -1; 
    }

    if( !eyes_cascade.load( eyes_cascade_name ) ){ 
        printf("--(!)Error loading\n"); 
        return -1; 
    }

    //-- 2. Read the video stream
    capture = cvCaptureFromCAM( -1 );
    if( capture )
    {
        while( true )
        {
            frame = cvQueryFrame( capture );

            //-- 3. Apply the classifier to the frame
            if( !frame.empty() ){ 
                detectAndDisplay( frame ); 
            }
            else { 
                printf(" --(!) No captured frame -- Break!"); 
                break; 
            }

            int c = waitKey(10);
            if( (char)c == 'c' ) { break; }
        }
    }
    return 0;
}

/** @function detectAndDisplay */
void detectAndDisplay( Mat frame )
{
    std::vector<Rect> faces;
    Mat frame_gray;

    cvtColor( frame, frame_gray, CV_BGR2GRAY );
    equalizeHist( frame_gray, frame_gray );

    //-- Detect faces
    face_cascade.detectMultiScale( frame_gray, faces, 1.1, 2, 0|CV_HAAR_SCALE_IMAGE, Size(30, 30) );

    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 );
        Point haut((center.x+faces[i].width*0.5),(center.y+faces[i].height*0.5));
        Point bas((center.x-faces[i].width*0.5),(center.y-faces[i].height*0.5));

        Point pt=bas;
        int X=pt.x;
        int Y=pt.y;
        int L=haut.x-X;
        int H=haut.y-Y;
        rectangle(frame,haut,bas,Scalar( 255, 0, 0 ),1,8,0);

        Mat faceROI = frame_gray( faces[i] );
        std::vector<Rect> eyes;

        //-- In each face, detect eyes
        eyes_cascade.detectMultiScale( faceROI, eyes, 1.1, 2, 0 |CV_HAAR_SCALE_IMAGE, Size(30, 30) );

        for( int j = 0; j < eyes.size(); j++ )
        {
            Point center( faces[i].x + eyes[j].x + eyes[j].width*0.5, faces[i].y + eyes[j].y + eyes[j].height*0.5 );
            Point haut((center.x+eyes[i].width*0.5),(center.y+eyes[i].height*0.5));
            Point bas((center.x-eyes[i].width*0.5),(center.y-eyes[i].height*0.5));
            pt=bas;
            int X=pt.x;
            int Y=pt.y;
            int L=haut.x-X;
            int H=haut.y-Y;

            rectangle(frame,haut,bas,Scalar( 0, 255, 0 ),1,8,0);
            rect = Rect (bas.x,bas.y,L,H);
            carre= frame(rect);
            lar=carre.rows;
            hau=carre.cols;
            eyestreatment(carre);
        }
    }
    imshow( window_name, frame );
}

/** @function eyestreatment */
void eyestreatment( Mat carre )
{
    cvtColor(carre,YCR,CV_BGR2YCrCb);
    inRange ( YCR, Scalar (20, 130, 70) , Scalar (255, 170, 130) , eye );

    imshow("carre",carre);
    imshow("YCR",eye);
    eye.release();
}

Answer 1

您在函数detectAndDisplay中的嵌套循环中出错。你有变量i在面上循环，变量j在眼睛上循环。但是，您有以下几行：

Point haut((center.x+eyes[i].width*0.5),(center.y+eyes[i].height*0.5));
Point bas((center.x-eyes[i].width*0.5),(center.y-eyes[i].height*0.5));

因此，如果你的眼睛少于你的脸，那么当你用脸部计数器指向你的眼睛时，你的eyes[i]访问权就会崩溃。当然，即使它没有崩溃，代码也是不正确的。

面部跟踪错误Opencv

1 个答案: