%% Human Skin Detection - Downloaded from berksoysal.blogspot.com
%% Please leave a comment or donate if you like the projects.
close all
clear all
clc
%%%%%%%%%%%% read an image
I = imread('image.jpg');
[Ix,Iy,Iz]=size(I);
if Ix>400&Iy>300
%%%%%%%%%%%%%%%% %reducing the scale of image, let the high is 400
I=imresize(I,[400,Iy*400/Ix],'nearest');
end
figure
imshow(I)
title('Original Image')
%%%%%%%%%%%%%%%%%%%%%%%%%%%% skin detection
I=double(I); %converting the integer into decimal fraction
[hue,s,v]=rgb2hsv(I); %converting RGB space into HSV space
cb=0.148*I(:,:,1)-0.291*I(:,:,2)+0.439*I(:,:,3)+128;%converting RGB space into YCrCb space
cr=0.439*I(:,:,1)-0.368*I(:,:,2)-0.071*I(:,:,3)+128;
[w h]=size(I(:,:,1)); %size of the image
%%%%%%%%%%%%%%%%%%%%% let the skin pels points in the YCrCb space as 1
for i=1:w
for j=1:h
% segmenting the yellow skin colour areas
if 145<=cr(i,j)&cr(i,j)<=165&145<=cb(i,j)&cb(i,j)<=180&0.01<=hue(i,j)&hue(i,j)<=0.15
segment(i,j)=1; %skin areas
else
segment(i,j)=0;
end
end
end
%%%%%%%%%%%%%%% processing on the detected areas
skin=segment;
% removing small connected pixels
skin=bwareaopen(skin,round(w*h/900));
%dilating
se=strel('disk',5);
skin=imdilate(skin,se);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%display skin areas
im(:,:,1)=I(:,:,1).*skin;
im(:,:,2)=I(:,:,2).*skin;
im(:,:,3)=I(:,:,3).*skin;
% %%%%%%%%%%%%%%%%%%%%%%%%%% detection of face object
BW = skin;
%%%%%%%%%%%%%%%%%%%%%% marking the connected areas
L = bwlabel(BW,8);
%%%%% calculating acreage of every connected area and converting the dataof cell into array
BB = regionprops(L, 'BoundingBox');
BB1=struct2cell(BB);
%saving the begining point of connected frame and its high and wide
BB2=cell2mat(BB1);
figure,imshow(uint8(I));
title('Human Skins are Detected !');
%%%%%%%%%%%%%%%%%%%%% show the target in rectangular frame
[s1 s2]=size(BB2);
for k=3:4:s2-1
%%%%%%%%%%%%%%%%BB2(1,k)wide��BB2(1,k+1)high
if (BB2(1,k)/BB2(1,k+1)) < 1.8 &&....
(BB2(1,k)/BB2(1,k+1)) > 0.4 &&....
(BB2(1,k)*BB2(1,k+1)) > 1000
%%% considering the areas which have 0.4<W/H<1.8 and their pixels acreage is bigger than 1000 as face
hold on;
rectangle('Position',[BB2(1,k-2),BB2(1,k-1),BB2(1,k),BB2(1,k+1)],'EdgeColor','r' )
% RED RECTANGLE WILL SURROUND THE SKIN
end
end
