基于人工神经网络的MATLAB手写数字识别系统.doc
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基于人工神经网络的MATLAB手写数字识别系统
一、函数MouseDraw实现手写识别系统GUI界面的建立和鼠标手写的实现。
(使用时保存为MouseDraw.m)
functionMouseDraw(action)
%MouseDraw本例展示如何以HandleGraphics来设定滑鼠事件
%(MouseDrawEvents)的反应指令(Callbacks)
%本程序在鼠标移动非常快时,不会造成画“断线”
%global不能传矩阵
globalInitialXInitialYFigHandlehb2hb3hb4counthb5hb6hb7
count='E:
\im.jpg';
imSize=50;
ifnargin==0,action='start';
end
switch(action)
%%开启图形视窗
case'start',
FigHandle=figure('WindowButtonDownFcn','MouseDrawdown','DeleteFcn','savebpnet');
axis([1imSize1imSize]);%设定图轴范围%
set(gca,'Position',[.25.20.7.7]);
axisoff;
gridoff;
boxon;%将图轴加上图框
title('手写体输入窗');
tryevalin('base','loadbpnet')
catch
evalin('base','bpgdtrain');
end
%%fprintf('start');
%%设定滑鼠按钮被按下时的反应指令为「MouseDrawdown」
%set(gcf,'WindowButtonDownFcn','MouseDrawdown');
hb1=uicontrol('Parent',FigHandle,'Units','Normalized',...
'Position',[.3.01.13.07],'String','保存',...
'Callback',['exa=rgb2gray(frame2im(getframe(gca)));','imwrite(exa,''E:
\im.jpg'')']);
hb2=uicontrol('Parent',FigHandle,'Style','popupmenu','Position',[50505030],...
'String',{'26','24','22','20','18','16','14','12','10'});
hb3=uicontrol('Parent',FigHandle,'Style','text',...
'Position',[10909030],'String',['CurrentX()','CurrentY()']);
hb4=uicontrol('Parent',FigHandle,'Style','popupmenu','Position',[50205030],...
'String',{'Red','Blue','Black','Yellow','Green'});
uicontrol('Parent',FigHandle,'Position',[27067030],'String','训练','Callback',...
['exa=rgb2gray(frame2im(getframe(gca)));','sample=reshape(recgnition(exa),25,1);','clc;',...
't=inputdlg(''数字类别'',''样品训练'');','t=str2num(t{1,1})/10;',...
'bpnet.trainParam.lr=str2num(get(hb6,''String''));','bpnet.trainParam.goal=str2num(get(hb7,''String''));',...
'[bpnet]=train(bpnet,sample,t);','savebpnet']);
uicontrol('Parent',FigHandle,'Position',[36067030],'String','识别','Callback',...
['exa=rgb2gray(frame2im(getframe(gca)));','sample=reshape(recgnition(exa),25,1);',...
'record=round(sim(bpnet,sample)*10);','clc;','set(hb5,''String'',num2str(record),''fontSize'',48);']);
uicontrol('Parent',FigHandle,'Style','text','Position',[10603020],'String','字号');
uicontrol('Parent',FigHandle,'Style','text','Position',[10303020],'String','颜色');
hb5=uicontrol('Parent',FigHandle,'Style','text','Position',[101509090]);
uicontrol('Parent',FigHandle,'Style','text','Position',[52605020],'String','学习速率');
hb6=uicontrol('Parent',FigHandle,'Style','Edit','Position',[602603020],'String','0.01');
uicontrol('Parent',FigHandle,'Style','text','Position',[52905020],'String','训练精度');
hb7=uicontrol('Parent',FigHandle,'Style','Edit','Position',[602903020],'String','0.005');
uicontrol('Parent',FigHandle,'Style','pushbutton','Position',[45067030],'String','清除','Callback','cla');
%将函数变量导入到工作空间;
assignin('base','hb5',hb5);
assignin('base','hb6',hb6);
assignin('base','hb7',hb7);
%%%%%%%%%%%%%%%%%%%%%%%%%%%
dlmwrite('IXT.txt',-10,'delimiter','\t','precision',6);
dlmwrite('IYT.txt',-10,'delimiter','\t','precision',6);%%滑鼠按钮被按下时的反应指令
case'down',
ifstrcmp(get(FigHandle,'SelectionType'),'normal')%如果是左键
set(FigHandle,'pointer','hand');
CurPiont=get(gca,'CurrentPoint');
InitialX=CurPiont(1,1);
InitialY=CurPiont(1,2);
dlmwrite('IXT.txt',InitialX,'-append','delimiter','\t','precision',6);
dlmwrite('IYT.txt',InitialY,'-append','delimiter','\t','precision',6);
%列印「MouseDrawdown!
」讯息
%%fprintf('MouseDrawdown!
\n');
%设定滑鼠移动时的反应指令为「MouseDrawmove」
set(gcf,'WindowButtonMotionFcn','MouseDrawmove');
set(gcf,'WindowButtonUpFcn','MouseDrawup');
elseifstrcmp(get(FigHandle,'SelectionType'),'alt')%如果是右键
set(FigHandle,'Pointer','arrow');
set(FigHandle,'WindowButtonMotionFcn','')
set(FigHandle,'WindowButtonUpFcn','')
fprintf('MouseDrawrightbuttondown!
\n');
ImageX=importdata('IXT.txt');
ImageY=importdata('IYT.txt');
InputImage=ones(imSize);
roundX=round(ImageX);
roundY=round(ImageY);
fork=1:
size(ImageX,1)
if0InputImage(roundX(k)-1:
roundX(k)+2,roundY(k)-1:
roundY(k)+2)=0;
end
end
InputImage=imrotate(InputImage,90);%图像旋转90
figure
(2);
imshow(InputImage);
end
%%滑鼠移动时的反应指令
case'move',
CurPiont=get(gca,'CurrentPoint');
X=CurPiont(1,1);
Y=CurPiont(1,2);
set(hb3,'String',['CurrentX(',num2str(X),')','CurrentY(',num2str(Y),')']);
%当鼠标移动较快时,不会出现离散点。
%利用y=kx+b直线方程实现。
x_gap=0.1;
%定义x方向增量
y_gap=0.1;
%定义y方向增量
ifX>InitialX
step_x=x_gap;
else
step_x=-x_gap;
end
ifY>InitialY
step_y=y_gap;
else
step_y=-y_gap;
end
%定义x,y的变化范围和步长
ifabs(X-InitialX)<0.01%线平行于y轴,即斜率不存在时
iy=InitialY:
step_y:
Y;
ix=X.*ones(1,size(iy,2));
else
ix=InitialX:
step_x:
X;
%定义x的变化范围和步长%当斜率存在,即k=(Y-InitialY)/(X-InitialX)~=0
iy=(Y-InitialY)/(X-InitialX).*(ix-InitialX)+InitialY;
end
ImageX=[ix,X];
ImageY=cat(2,iy,Y);
popup_index1=26-(get(hb2,'Value')-1)*2;
popup_index2=get(hb4,'Value');
switch(popup_index2)
case1
line(ImageX,ImageY,'marker','.','markerSize',popup_index1,...
'LineStyle','-','LineWidth',4,'Color','Red');
case2
line(ImageX,ImageY,'marker','.','markerSize',popup_index1,...
'LineStyle','-','LineWidth',4,'Color','Blue');
case3
line(ImageX,ImageY,'marker','.','markerSize',popup_index1,...
'LineStyle','-','LineWidth',4,'Color','Black');
case4
line(ImageX,ImageY,'marker','.','markerSize',popup_index1,...
'LineStyle','-','LineWidth',4,'Color','Yellow');
case5
line(ImageX,ImageY,'marker','.','markerSize',popup_index1,...
'LineStyle','-','LineWidth',4,'Color','Green');
end
dlmwrite('IXT.txt',ImageX,'-append','delimiter','\t','precision',6);
dlmwrite('IYT.txt',ImageY,'-append','delimiter','\t','precision',6);
InitialX=X;%记住当前点坐标
InitialY=Y;%记住当前点坐标
%列印「MouseDrawismoving!
」及滑鼠现在位置
%fprintf('MouseDrawismoving!
Currentlocation=(%g,%g)\n',...
%CurPiont(1,1),CurPiont(1,2));
%%fprintf('MouseDrawmove!
\n');
%设定滑鼠按钮被释放时的反应指令为「MouseDrawup」
set(gcf,'WindowButtonUpFcn','MouseDrawup');
%%滑鼠按钮被释放时的反应指令
case'up',
%清除滑鼠移动时的反应指令
set(gcf,'WindowButtonMotionFcn','');
%清除滑鼠按钮被释放时的反应指令
set(gcf,'WindowButtonUpFcn','');
%列印「MouseDrawup!
」
%%fprintf('MouseDrawup!
\n');
end
end
二、实现手写数字图像特征的提取:
(存为recgnition.m)
functionsample=recgnition(exa)
[i,j]=find(exa~=204);
imin=min(i);
imax=max(i);
jmin=min(j);
jmax=max(j);
a=exa(imin:
imax,jmin:
jmax);
M=imax-imin+1;
N=jmax-jmin+1;
form=1:
5
forn=1:
5
exa_c{m,n}=a(1+(m-1)*M/5:
m*M/5,1+(n-1)*N/5:
n*N/5);
sample(1,(m-1)*5+n)=size(find(exa_c{m,n}~=204),1)/(M*N/25);
%subplot(5,5,(m-1)*5+n),subimage(exa_c{m,n});
end
end
三、建立bp神经网络。
(可修改所建立bp神经网络参数,也可建立其他类型神经网络)。
x=ones(25,2);
x(:
1)=0;
bpnet=newff(x,[50,1],{'logsig','logsig'},'traingd');
bpnet.trainParam.show=5;%显示训练迭代过程(每隔5次训练,显示一次训练进程)
bpnet.trainParam.lr=0.01;%学习速率
bpnet.trainParam.epochs=2000;%最大训练次数
bpnet.trainParam.goal=0.005;%训练要求精度(0.005)
此段命令应存为bpgdtrain.m文件。
以上函数以及m文件须保存以后才可调用。
神经网络要经过一定数量的训练才能达到较高的识别精度。
使用时先运行MouseDraw函数,出现下图界面,
界面介绍:
保存:
可将手写数字图像保存为im.jpg文件。
训练:
用于有导师训练神经网络,用户使用鼠标写好数字,点击训练,弹出输入框框,输入相应正确数字。
识别:
对界面上的手写数字进行识别,结果显示在左边白色方框。
清除:
可清除界面上数字,重新书写。
字号、颜色选择下拉框可选择手写数字字号与颜色。
:
控制训练精度和学习速率。
具体参照bp神经网络。