基于MATLAB的图片中字符的提取源代码.docx

基于MATLAB的图片中字符的提取（源代码）

functiongetPicChar%%建立字符提取函数，在MATLAB平台上直接运行即可
%运用MATLAB的UI，直接打牌需要提取的字符图片即可
[filename,pathname,~]=uigetfile({'*.jpg';'*.bmp';'*.png'},'Choseapicture');
picstr=[pathnamefilename];
if~ischar(picstr)
return;
end
pic=imread(picstr);%打开图片

iflength(size(pic))==3%判断图片的维数，统一为灰度图片
pic=rgb2gray(pic);
end
pic=(pic<127);%转化为二值图片

pic=xylimit(pic);%图片区域的第一次边界限定

%%%%%%%第一阶段%%%%%%
m=size(pic,1);
Ycount=zeros(1,m);
fori=1:m
Ycount(i)=sum(pic(i,:));
end
lenYcount=length(Ycount);
Yflag=zeros(1,lenYcount);
fork=1:lenYcount-2
ifYcount(k)<3&&Ycount(k+1)<3&&Ycount(k+2)<3
Yflag(k)=1;
end
end
fork=lenYcount:1+2
ifYcount(k)<3&&Ycount(k-1)<3&&Ycount(k-2)<3
Yflag(k)=1;
end
end
Yflag2=[0Yflag(1:end-1)];
Yflag3=abs(Yflag-Yflag2);%做差分运算
[~,row]=find(Yflag3==1);%找突变位置
row=[1rowm];%调整突变位置点
row1=zeros(1,length(row)/2);%截取图像的起始位置向量
row2=row1;%截取图像的终止位置向量
fork=1:length(row)
ifmod(k,2)==1;%奇数为起始
row1((k+1)/2)=row(k);
else%偶数为终止
row2(k/2)=row(k);
end
end
pic2=pic(row1(1):row2(1),:);%截取第一列字符
alpha=1024/size(pic2,2);%计算放缩比例
pic2=imresize(pic2,alpha);%调整第一列字符图片大小，作为基准
fork=2:length(row)/2
pictemp=imresize(pic(row1(k):row2(k),:),[size(pic2,1)size(pic2,2)]);
pic2=cat(2,pic2,pictemp);%横向连接图像块
end
pic=xylimit(pic2);%限定图像区域

%%%%%%%第二阶段%%%%%%
[~,n]=size(pic);
Xcount=zeros(1,n);
forj=1:n
Xcount(j)=sum(pic(:,j));
end
lenXcount=length(Xcount);
Xflag=zeros(1,lenXcount);
fork=1:lenXcount-2
ifXcount(k)<3&&Xcount(k+1)<3&&Xcount(k+2)<3
Xflag(k)=1;
end
end
fork=lenXcount:1+2
ifXcount(k)<3&&Xcount(k-1)<3&&Xcount(k-2)<3
Xflag(k)=1;
end
end
Xflag2=[0Xflag(1:end-1)];
Xflag3=abs(Xflag-Xflag2);
[~,col]=find(Xflag3==1);
col=[1colsize(pic,2)];
coltemp=col(2:end)-col(1:end-1);
[~,ind]=find(coltemp<3);
col(ind)=0;
col(ind+1)=0;
col=col(col>0);
col1=zeros(1,length(col)/2);
col2=col1;
fork=1:length(col)
ifmod(k,2)==1
col1((k+1)/2)=col(k);
else
col2(k/2)=col(k);
end
end
picnum2=length(col)/2;
piccell2=cell(1,picnum2);
fork=1:picnum2
piccell2{k}=pic(:,col1(k):col2(k));
piccell2{k}=xylimit(piccell2{k});
picce