compare.c

基于主成份分析（PCA）的人脸特征识别核心源程序。

/***
 **     libface - Library of face recognition and supporting algorithms
        Copyright (c) 2003 Stefan Farthofer

	This file is part of libface, which is

        free software; you can redistribute it and/or modify
        it under the terms of the GNU General Public License as published by
        the Free Software Foundation; either version 2 of the License, or
        (at your option) any later version.

        This program is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU General Public License for more details.

        You should have received a copy of the GNU General Public License
        along with this program; if not, write to the Free Software
        Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

	For further information seek us at http://sourceforge.net/projects/openbio/
**	or write an email to [e-mail] or [e-mail].
***/

#include <IL/IL.h>
#include "frbase.h"
#include "fr.h"
#include "recoalgo.h"

int frCmp(FRrecognitionParameters* gParms, FRimageTrait* traits1, FRimageTrait* traits2, float* match) {
	float temp;
	unsigned int i;
	int err=FR_OK;
	FRrecoAlgo* algo;

	/* we calculate the arithmetic mean, initialize with zero */
	*match=0.0f;

	/* get results */
	for (i=0; err == FR_OK && i < gParms->nrAlgorithms; i++) {
		algo = frGetRecoAlgoById(gParms->algorithms[i].algorithmType);
		err = algo->compareTraits(gParms, gParms->algorithms[i].data, traits1[i].data, traits2[i].data, &temp);
		*match = *match + temp; /* add */
	}

	/* and divide */
	*match = *match / (float)gParms->nrAlgorithms;
	return err;
}