Ear detection using opencv - opencv

Question

I am trying to detect ears in a profile image(side view) of face.I tried using harrcascades (haarcascade_mcs_rightear,haarcascade_mcs_leftear,left_ear.xml,right_ear.xml) provided in opencv.I am able to detect profile face.But I am not able to detect ears with any one of haarcascade.I am specifying region of interest using profile face detector.I am not able to find out where i am going wrong.Please help me with that.A code snippet for the same would be of great help.Thanks in advance.Following is the code with comments.
#include <stdio.h>
#include<conio.h>
#include "cv.h"
#include "highgui.h"
using namespace std;
using namespace cv;
CvMemStorage *storage;
int detectFeature(int,char *imname,IplImage* image,CvRect featureROI, Rect* feature_box);
const char *file_profileface = "haarcascade_profileface.xml";
const char *ear_profileface = "left_ear.xml";//cascade name
CvRect profile_face;
CvRect ear;
int main()
{
int flagFaceDetect;
storage = cvCreateMemStorage(0);
assert(storage);
Rect faceRect;Rect leftEar;Rect rightEar;
char myimage1[50];
sprintf(myimage1,"profile%d.jpg",1);
IplImage* img = cvLoadImage(myimage1, CV_LOAD_IMAGE_COLOR);
/*first detect profile face and then detect ears*/
Rect* rectptr = &faceRect;//rectangle for profile face
CvRect face_roi = cvGetImageROI(img);
flagFaceDetect = detectFeature(0,myimage1,img,face_roi,rectptr);
rectptr = &leftEar;
//set ROI for ear with respect to profile face rectangle
CvRect leftear_roi = cvRect(faceRect.x+faceRect.x*3/4,faceRect.y+faceRect.height /4,faceRect.x+faceRect.width+faceRect.width/10,faceRect.y+faceRect.height-faceRect.height/4);
flagFaceDetect = detectFeature(1,myimage1,img,leftear_roi,rectptr);
getch();
return 0;
}
int detectFeature(int feature_index,char *imname,IplImage* image,CvRect featureROI, Rect* feature_box) {//general function to locate feature
cvSetImageROI(image, featureROI);
CvSeq* feature;
CvHaarClassifierCascade* featureCascade;
if(feature_index==0)//cascade for profile face
featureCascade = (CvHaarClassifierCascade*) cvLoad(file_profileface, 0, 0, 0);
if(feature_index==1)//cascade for ear
featureCascade = (CvHaarClassifierCascade*) cvLoad(ear_profileface, 0, 0, 0);
// feature = cvHaarDetectObjects(image,featureCascade,storage,1.1,2,CV_HAAR_DO_CANNY_PRUNING, cvSize(50,50));
feature = cvHaarDetectObjects(image,featureCascade,storage,1.2, 3,0,cvSize(18,12));
cvResetImageROI(image);
IplImage* displayImage = cvLoadImage(imname, CV_LOAD_IMAGE_COLOR);
CvRect* r;
int index_max_area;
int x1, x2, y1, y2; // opposite vertices of the rectangle
if (feature->total == 0) {
cout<<"here";
return 0;
}
else {
CvRect *fture = (CvRect*)cvGetSeqElem(feature, 0);
feature_box->x=fture->x;
feature_box->y=fture->y;
feature_box->height=fture->height;
feature_box->width=fture->width;
/* draw a red rectangle around the feature*/
cvRectangle(displayImage,
cvPoint(fture->x+fture->x*3/4,fture->y+fture->height/4),
cvPoint(fture->x+fture->width+fture->width/10,fture->y+fture->height-fture->height/4),
CV_RGB(0, 0, 255),
1, 8, 0
);
cvShowImage("frame",displayImage);
cvWaitKey(0);
return 1;
}
}