/face-src/Face/Face.cpp

// Face.cpp : Defines the exported functions for the DLL application.

//



#include "stdafx.h"

#include "Face.h"



#include <iostream>

#include <stdio.h>



#include <opencv2/opencv.hpp>



using namespace std;

using namespace cv;





int detect_and_draw_faces( IplImage* image, CvHaarClassifierCascade* cascade)

{

	CvMemStorage* storage = cvCreateMemStorage(0);

	CvSeq* faces;



	/* use the fastest variant */

	//faces = cvHaarDetectObjects( image, cascade, storage, 1.2, 2, CV_HAAR_DO_CANNY_PRUNING );

	faces = cvHaarDetectObjects( image, cascade, storage, 1.1, 3, CV_HAAR_DO_CANNY_PRUNING );



	/* draw all the rectangles */

	for(int i = 0; i < faces->total; i++ ) {

		/* extract the rectangles only */

		CvRect face_rect = *(CvRect*)cvGetSeqElem( faces, i);

		cvRectangle( image, cvPoint(face_rect.x, face_rect.y),

			cvPoint((face_rect.x + face_rect.width), (face_rect.y + face_rect.height)),

			CV_RGB(255,0,0), 3 );

	}



	cvReleaseMemStorage( &storage );



	return faces->total;

}



FACE_API int detect_faces(char* input_file, char *xml, int display) 

{

	CvHaarClassifierCascade *classifier = NULL;

	IplImage* image = NULL;

	int faces;



	classifier = (CvHaarClassifierCascade*)cvLoad(xml, 0, 0, 0);

	if (!CV_IS_HAAR_CLASSIFIER(classifier)) {

		printf("Cannot load haar classifier file: %s\n", xml);

		return -1;

	}



	image = cvLoadImage( input_file );

	if (image == NULL) {

		printf("Cannot load image: %s\n", input_file);

		return -2;

	}



	faces = detect_and_draw_faces( image, classifier);



	if (display == 1) {

		cvNamedWindow( "test", 0 );

		cvShowImage( "test", image );

		cvWaitKey(0);

	}



	cvReleaseHaarClassifierCascade( &classifier );

	cvReleaseImage( &image );



	return faces;

}