使用OpenCv进行人脸识别

#include "cv.h"
#include "highgui.h" 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <math.h>
#include <float.h>
#include <limits.h>
#include <time.h>
#include <ctype.h> 
#ifdef _EiC
#define WIN32
#endif 
static CvMemStorage* storage = 0;
static CvHaarClassifierCascade* cascade = 0; 
void detect_and_draw( IplImage* image ); 
const char* cascade_name =    "haarcascade_frontalface_alt.xml";/*    "haarcascade_profileface.xml";*/ 
int main( int argc, char** argv )
{    
CvCapture* capture = 0;    
IplImage *frame, *frame_copy = 0;    
int optlen = strlen("--cascade=");    
const char* input_name; 
    if( argc > 1 && strncmp( argv[1], "--cascade=", optlen ) == 0 )    
{
        cascade_name = argv[1] + optlen;        
input_name = argc > 2 ? argv[2] : 0;    
}    
else    

{
        cascade_name = "haarcascade_frontalface_alt2.xml";
        //opencv装好后haarcascade_frontalface_alt2.xml的路径,       //也可以把这个文件拷到你的工程文件夹下然后不用写路径名cascade_name= "haarcascade_frontalface_alt2.xml";  
       //或者cascade_name ="C:\\Program Files\\OpenCV\\data\\haarcascades\\haarcascade_frontalface_alt2.xml"
        input_name = argc > 1 ? argv[1] : 0;    
} 
    cascade = (CvHaarClassifierCascade*)cvLoad( cascade_name, 0, 0, 0 ); 
    if( !cascade )    
{        
fprintf( stderr, "ERROR: Could not load classifier cascade\n" );
        fprintf( stderr,        "Usage: facedetect --cascade=\"<cascade_path>\" [filename|camera_index]\n" );
        return -1;    
}    
storage = cvCreateMemStorage(0);     
if( !input_name || (isdigit(input_name[0]) && input_name[1] == '\0') )
        capture = cvCaptureFromCAM( !input_name ? 0 : input_name[0] - '0' );    
else        
capture = cvCaptureFromAVI( input_name );      
cvNamedWindow( "result", 1 );     
if( capture )    
{       
for(;;)        
{
            if( !cvGrabFrame( capture ))                
break;            
frame = cvRetrieveFrame( capture );            
if( !frame )
                break;            
if( !frame_copy )
                frame_copy = cvCreateImage( cvSize(frame->width,frame->height),