rectifier quelque information sur opencv

#include "stdafx.h"
#include <cv.h>
 
#include <stdio.h>
#include <cxcore.h>
#include <highgui.h>
using namespace std;
CvHaarClassifierCascade* cascade = 0;
CvMemStorage* storage = 0;
int _tmain(int  argc, _TCHAR* argv[])
{  int i;
    for (int k=0;k<100;k++)
{  
std::string varimg;
char format[] = "franck_000%d.jpg";
char filename[sizeof format+100];
sprintf(filename,format,k);
varimg = filename ;
IplImage*imgw = cvLoadImage( varimg.c_str() );
IplImage* gray;
 
  /* Load the face detector and create memory storage
    `cascade` and `storage` are global variables */
  if (!cascade) {
    char* file = "C:/OpenCV-2.1.0/data/haarcascades/haarcascade_frontalface_alt.xml";
    cascade = (CvHaarClassifierCascade*) cvLoad(file, 0, 0, 0);
    storage = cvCreateMemStorage(0);
  }
/* Convert multichannel to 1-channel for faster processing */
  if (imgw->nChannels == 1) {
    gray == cvClone(imgw);
  } else {
    gray = cvCreateImage(cvGetSize(imgw), imgw->depth, 1);
    cvCvtColor(imgw, gray, CV_RGB2GRAY);
  }
 /* detect faces */
  CvSeq* faces = cvHaarDetectObjects(gray,cascade,storage,1.1,3,CV_HAAR_DO_CANNY_PRUNING,cvSize(20, 20));
  int i;
/* Draw red boxes on the faces found */
  for( i = 0; i < (faces ? faces->total : 0); i++ ) {
    CvRect* r = (CvRect*)cvGetSeqElem(faces, i);
 cvRectangle(imgw,cvPoint(r->x, r->y),cvPoint(r->x + r->width, r->y + r->height),CV_RGB(255, 0, 0),3, 8, 0);
  }
 cvNamedWindow( "Example1", CV_WINDOW_AUTOSIZE );
    cvShowImage("Example1",imgw);
    cvWaitKey(1);
	cvReleaseImage(&imgw);
}
    return 0;
}