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| // OpenCV Sample Application: facedetect.c
// Include header files
#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>
// Create memory for calculations
static CvMemStorage* storage = 0;
// Create a new Haar classifier
static CvHaarClassifierCascade* cascade = 0;
// Function prototype for detecting and drawing an object from an image
void detect_and_draw( IplImage* image );
// Create a string that contains the cascade name
const char* cascade_name =
"haarcascade_frontalface_alt.xml";
/* "haarcascade_profileface.xml";*/
// Main function, defines the entry point for the program.
int main( int argc, char** argv )
{
// Structure for getting video from camera or avi
CvCapture* capture = 0;
// Images to capture the frame from video or camera or from file
IplImage *frame, *frame_copy = 0;
// Used for calculations
int optlen = strlen("--cascade=");
// Input file name for avi or image file.
const char* input_name;
// Check for the correct usage of the command line
if( argc > 1 && strncmp( argv[1], "--cascade=", optlen ) == 0 )
{
cascade_name = argv[1] + optlen;
input_name = argc > 2 ? argv[2] : 0;
}
else
{
fprintf( stderr,
"Usage: facedetect --cascade=\"<cascade_path>\" [filename|camera_index]\n" );
return -1;
/*input_name = argc > 1 ? argv[1] : 0;*/
}
printf ("%s\n", cascade_name);
// Load the HaarClassifierCascade
cascade = (CvHaarClassifierCascade*)cvLoad( cascade_name, 0, 0, 0 );
// Check whether the cascade has loaded successfully. Else report and error and quit
if( !cascade )
{
fprintf( stderr, "ERROR: Could not load classifier cascade\n" );
return -1;
}
// Allocate the memory storage
storage = cvCreateMemStorage(0);
// Find whether to detect the object from file or from camera.
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 );
// Create a new named window with title: result
cvNamedWindow( "result", 1 );
// Find if the capture is loaded successfully or not.
// If loaded succesfully, then:
if( capture )
{
// Capture from the camera.
for(;;)
{
// Capture the frame and load it in IplImage
if( !cvGrabFrame( capture ))
break;
frame = cvRetrieveFrame( capture );
// If the frame does not exist, quit the loop
if( !frame )
break;
// Allocate framecopy as the same size of the frame
if( !frame_copy )
frame_copy = cvCreateImage( cvSize(frame->width,frame->height),
IPL_DEPTH_8U, frame->nChannels );
// Check the origin of image. If top left, copy the image frame to frame_copy.
if( frame->origin == IPL_ORIGIN_TL )
cvCopy( frame, frame_copy, 0 );
// Else flip and copy the image
else
cvFlip( frame, frame_copy, 0 );
// Call the function to detect and draw the face
detect_and_draw( frame_copy );
// Wait for a while before proceeding to the next frame
if( cvWaitKey( 10 ) >= 0 )
break;
}
// Release the images, and capture memory
cvReleaseImage( &frame_copy );
cvReleaseCapture( &capture );
}
// If the capture is not loaded succesfully, then:
else
{
// Assume the image to be lena.jpg, or the input_name specified
const char* filename = input_name ? input_name : (char*)"lena.jpg";
// Load the image from that filename
IplImage* image = cvLoadImage( filename, 1 );
// If Image is loaded succesfully, then:
if( image )
{
// Detect and draw the face
detect_and_draw( image );
// Wait for user input
cvWaitKey(0);
// Release the image memory
cvReleaseImage( &image );
}
else
{
/* assume it is a text file containing the
list of the image filenames to be processed - one per line */
FILE* f = fopen( filename, "rt" );
if( f )
{
char buf[1000+1];
// Get the line from the file
while( fgets( buf, 1000, f ) )
{
// Remove the spaces if any, and clean up the name
int len = (int)strlen(buf);
while( len > 0 && isspace(buf[len-1]) )
len--;
buf[len] = '\0';
// Load the image from the filename present in the buffer
image = cvLoadImage( buf, 1 );
// If the image was loaded succesfully, then:
if( image )
{
// Detect and draw the face from the image
detect_and_draw( image );
// Wait for the user input, and release the memory
cvWaitKey(0);
cvReleaseImage( &image );
}
}
// Close the file
fclose(f);
}
}
}
// Destroy the window previously created with filename: "result"
cvDestroyWindow("result");
// return 0 to indicate successfull execution of the program
return 0;
}
// Function to detect and draw any faces that is present in an image
void detect_and_draw( IplImage* img )
{
int scale = 1;
// Create a new image based on the input image
IplImage* temp = cvCreateImage( cvSize(img->width/scale,img->height/scale), 8, 3 );
// Create two points to represent the face locations
CvPoint pt1, pt2;
int i;
// Clear the memory storage which was used before
cvClearMemStorage( storage );
// Find whether the cascade is loaded, to find the faces. If yes, then:
if( cascade )
{
// There can be more than one face in an image. So create a growable sequence of faces.
// Detect the objects and store them in the sequence
CvSeq* faces = cvHaarDetectObjects( img, cascade, storage,
1.1, 2, CV_HAAR_DO_CANNY_PRUNING,
cvSize(40, 40) );
// Loop the number of faces found.
for( i = 0; i < (faces ? faces->total : 0); i++ )
{
// Create a new rectangle for drawing the face
CvRect* r = (CvRect*)cvGetSeqElem( faces, i );
// Find the dimensions of the face,and scale it if necessary
pt1.x = r->x*scale;
pt2.x = (r->x+r->width)*scale;
pt1.y = r->y*scale;
pt2.y = (r->y+r->height)*scale;
// Draw the rectangle in the input image
cvRectangle( img, pt1, pt2, CV_RGB(255,0,0), 3, 8, 0 );
}
}
// Show the image in the window named "result"
cvShowImage( "result", img );
// Release the temp image created.
cvReleaseImage( &temp );
} |
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