opencv人脸检测成功，但是为什么人眼检测却出错？新人小白求解。

Question

#include "opencv2/objdetect.hpp"
#include "opencv2/videoio.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/imgproc.hpp"

#include
#include

using namespace std;
using namespace cv;

/** Function Headers */
void detectAndDisplay( Mat frame );

/** 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";

/** @function main */
int main( void )
{
VideoCapture capture;
Mat frame;

//-- 1. Load the cascades
if( !face_cascade.load( face_cascade_name ) ){ printf("--(!)Error loading face cascade\n"); return -1; };
if( !eyes_cascade.load( eyes_cascade_name ) ){ printf("--(!)Error loading eyes cascade\n"); return -1; };
//do{} while (!face_cascade.load(face_cascade_name));
//do{} while (!eyes_cascade.load(eyes_cascade_name));

//-- 2. Read the video stream
capture.open(0);
if ( ! capture.isOpened() ) { printf("--(!)Error opening video capture\n"); return -1; }

while ( capture.read(frame) )
{
    if( frame.empty() )
    {
        printf(" --(!) No captured frame -- Break!");
        break;
    }

    //-- 3. Apply the classifier to the frame
   detectAndDisplay( frame );
    //imshow("shexiangtou", frame);
    int c = waitKey(100);
    if( (char)c == 27 ) { break; } // escape
}
return 0;

}

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

cvtColor( frame, frame_gray, COLOR_BGR2GRAY );
equalizeHist( frame_gray, frame_gray );
double t = 0; double t1;
//-- Detect faces
face_cascade.detectMultiScale( frame_gray, faces, 1.1, 2, 0|CASCADE_SCALE_IMAGE, Size(30, 30) );
//t1= (double)(getTickCount() - t);
for ( size_t i = 0; i < faces.size(); i++ )
{
    Point center( faces[i].x + faces[i].width/2, faces[i].y + faces[i].height/2 );
    ellipse( frame, center, Size( faces[i].width/2, faces[i].height/2 ), 0, 0, 360, Scalar( 255, 0, 255 ), 4, 8, 0 );
    //rectangle(frame,Point(faces[i].x,faces[i].y),Point(faces[i].x+faces[i].width,faces[i].y+faces[i].height),Scalar(0,0,255),4,8,0);
   Mat faceROI = frame_gray( faces[i]);
    std::vector<Rect> eyes;
    //-- In each face, detect eyes
    eyes_cascade.detectMultiScale( frame_gray, eyes, 1.1, 2, 0 |CASCADE_SCALE_IMAGE, Size(30, 30) );

    for ( size_t j = 0; j < eyes.size(); j++ )
    {
        Point eye_center( faces[i].x + eyes[j].x + eyes[j].width/2, faces[i].y + eyes[j].y + eyes[j].height/2 );
        int radius = cvRound( (eyes[j].width + eyes[j].height)*0.25 );
        circle( frame, eye_center, radius, Scalar( 255, 0, 0 ), 4, 8, 0 );
    }
}
//-- Show what you got
imshow( window_name, frame );

}

Answer 1

http://blog.csdn.net/mtxing69/article/details/51769663