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/////////////////////////////////////////////////////////////////////////////
// Name: crvskindetection.cpp
// Purpose:
// Author: Cesar Mauri Loba (cesar at crea-si dot com)
// Modified by:
// Created: 23/02/2008
// Copyright: (C) 2008 Cesar Mauri Loba - CREA Software Systems
//
// This program 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 3 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, see <http://www.gnu.org/licenses/>.
/////////////////////////////////////////////////////////////////////////////
#include "crvmisc.h"
#include "crvskindetection.h"
#include <assert.h>
#include <string.h>
void CSkinRegionModel::crvBinarizeSkin_KToyama (IplImage *pIpl, float &krg_min,
float &krg_max, float &krb_min,
float &krb_max)
{
int x, y, xIni, yIni, xLim, yLim;
float krg, krb;
unsigned char *pSrc;
assert (pIpl);
crvGetROILimits (pIpl, xIni, yIni, xLim, yLim);
for (y= yIni; y< yLim; y++) {
pSrc= (unsigned char *) crvImgOffset (pIpl, xIni, y);
for (x= xIni; x< xLim; x++) {
krg= (float) pSrc[0] / (float) pSrc[1];
krb= (float) pSrc[0] / (float) pSrc[2];
if (krg_min<= krg && krg_max>= krg &&
krb_min<= krb && krb_max>= krb) {
pSrc[0]= pSrc[1]= pSrc[2]= 255;
}
else
pSrc[0]= pSrc[1]= pSrc[2]= 0;
pSrc+= 4;
}
}
}
//
// Skin Models Definition
//
#define min(x,y) (x< y? x : y)
#define max(x,y) (x> y? x : y)
#define min3(x,y,z) (min(min(x,y),z))
#define max3(x,y,z) (max(max(x,y),z))
// The skin colour at uniform daylight illumination
#define IS_SKIN_PEER(R,G,B) (R> 95 && G> 40 && B> 20 && R> G && R> B && \
(max3(R,G,B) - min3(R,G,B))> 15 && \
((R-G)> 15 || (G-R)> 15))
// The skin colour under flashlight or (light) daylight
// lateral illumination
#define IS_SKIN_PEER2(R,G,B) (R> 220 && G> 210 && B> 170 && \
((R-G)< 15 || (G-R)< 15) && \
R> B && G> B)
inline bool IsSkin_GomezMorales_1 (int R, int G, int B)
{
float r, g, b, rgb, rgb2;
r= (float) R / 255.0f; g= (float) G / 255.0f; b= (float) B / 255.0f;
rgb= r + g + b;
rgb2= rgb * rgb;
return ( ((r/g)> 1.185) && (((r*b)/rgb2)> 0.107) && (((r*g)/rgb2)> 0.112) );
}
inline bool IsSkin_GomezMorales_2 (int R, int G, int B)
{
float r, g, b, rgb;
r= (float) R / 255.0f; g= (float) G / 255.0f; b= (float) B / 255.0f;
rgb= r + g + b;
return ( (b/g)< 1.249 && (rgb / (3*r))> 0.696 &&
((1.0/3.0) - (b/rgb))> 0.014 && (g / (3*rgb))< 0.108 );
}
void CSkinRegionModel::crvBinarizeSkin (IplImage *pSrc, IplImage *pDst)
{
int x, y, xIni, yIni, xLim, yLim, srcBytesPPixel, dstBytesPPixel;
unsigned char *pSrcB, *pDstB;
bool isBGR= false;
assert (pSrc && pSrc->imageData && pDst && pDst->imageData);
if (!strncmp (pSrc->channelSeq, "BGR", 4) || !strncmp (pSrc->channelSeq, "BGRA", 4))
isBGR= true;
else if (!strncmp (pSrc->channelSeq, "RGB", 4) || !strncmp (pSrc->channelSeq, "RGBA", 4))
isBGR= false;
else
assert (false);
assert (!strncmp (pDst->channelSeq, "GRAY", 4) || !strncmp (pDst->channelSeq, "BGRA", 4));
// Get depth
srcBytesPPixel= pSrc->nChannels;
dstBytesPPixel= pDst->depth / 8;
cvSetZero(pDst);
crvGetROILimits (pSrc, xIni, yIni, xLim, yLim);
if (isBGR)
for (y= yIni; y< yLim; y++) {
pSrcB= (unsigned char *) crvImgOffset (pSrc, xIni, y);
pDstB= (unsigned char *) crvImgOffset (pDst, xIni, y);
for (x= xIni; x< xLim; x++) {
if (IS_SKIN_PEER(pSrcB[2],pSrcB[1],pSrcB[0]))
{
// Color acceptat
pDstB[0]= 255;
if (dstBytesPPixel> 1)
{
pDstB[1]= 255;
if (dstBytesPPixel> 2)
{
pDstB[2]= 255;
}
}
}
pSrcB+= srcBytesPPixel;
pDstB+= dstBytesPPixel;
}
}
else
for (y= yIni; y< yLim; y++) {
pSrcB= (unsigned char *) crvImgOffset (pSrc, xIni, y);
pDstB= (unsigned char *) crvImgOffset (pDst, xIni, y);
for (x= xIni; x< xLim; x++) {
if (IS_SKIN_PEER(pSrcB[0],pSrcB[1],pSrcB[2]))
{
// Color acceptat
pDstB[0]= 255;
if (dstBytesPPixel> 1)
{
pDstB[1]= 255;
if (dstBytesPPixel> 2)
{
pDstB[2]= 255;
}
}
}
pSrcB+= srcBytesPPixel;
pDstB+= dstBytesPPixel;
}
}
}
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