图像处理基于模板匹配的验证码识别
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识别思路:这个验证码比较规则,数字都是显示在固定的区域,数字也无粘连,实现步骤如下
图片去噪
对图像进行分割,分割成一个图像显示一个数字
对每个图像进行灰化处理,就是设置一个阈值将他们变成黑白图片
建立一个标准的数字图像库
将每个被分割的小图片与标准库比较,像素点重合最多的就是该数字
function varargout = MainForm(varargin)
MAINFORM MATLAB code for MainForm.fig
MAINFORM, by itself, creates a new MAINFORM or raises the existing
singleton*.
%
H = MAINFORM returns the handle to a new MAINFORM or the handle to
the existing singleton*.
%
MAINFORM('CALLBACK',hObject,eventData,handles,...) calls the local
function named CALLBACK in MAINFORM.M with the given input arguments.
%
MAINFORM('Property','Value',...) creates a new MAINFORM or raises the
existing singleton*. Starting from the left, property value pairs are
applied to the GUI before MainForm_OpeningFcn gets called. An
unrecognized property name or invalid value makes property application
stop. All inputs are passed to MainForm_OpeningFcn via varargin.
%
*See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one
instance to run (singleton)".
%
See also: GUIDE, GUIDATA, GUIHANDLES
Edit the above text to modify the response to help MainForm
Last Modified by GUIDE v2.5 28-Jun-2013 10:42:40
Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
gui_Singleton, ...
@MainForm_OpeningFcn, ...
@MainForm_OutputFcn, ...
[] , ...
[]);
if nargin && ischar(varargin{1})
str2func(varargin{1}); =
end
if nargout
nargout}] = gui_mainfcn(gui_State, varargin{:}); :
else
varargin{:});
end
End initialization code - DO NOT EDIT
--- Executes just before MainForm is made visible.
function MainForm_OpeningFcn(hObject, eventdata, handles, varargin)
This function has no output args, see OutputFcn.
hObject handle to figure
eventdata reserved - to be defined in a future version of MATLAB
handles structure with handles and user data (see GUIDATA)
varargin command line arguments to MainForm (see VARARGIN)
Choose default command line output for MainForm
hObject; =
clc;
'Box', 'on', 'Color', 'c', 'XTickLabel', '', 'YTickLabel', '');
'Box', 'on', 'Color', 'c', 'XTickLabel', '', 'YTickLabel', '');
'String', '');
0; =
0; =
0; =
0; =
Update handles structure
handles);
UIWAIT makes MainForm wait for user response (see UIRESUME)
uiwait(handles.figure1);
--- Outputs from this function are returned to the command line.
function varargout = MainForm_OutputFcn(hObject, eventdata, handles)
varargout cell array for returning output args (see VARARGOUT);
hObject handle to figure
eventdata reserved - to be defined in a future version of MATLAB
handles structure with handles and user data (see GUIDATA)
Get default command line output from handles structure
handles.output; =
function varargout = pushbutton1_CreateFcn(hObject, eventdata, handles)
--- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
hObject handle to pushbutton1 (see GCBO)
eventdata reserved - to be defined in a future version of MATLAB
handles structure with handles and user data (see GUIDATA)
载入图像
file = fullfile(pwd, 'test/下载.jpg');
Pathname] = uigetfile({'*.jpg;*.tif;*.png;*.gif','All Image Files';...
Files' }, '载入验证码图像',...
file);
if isequal(Filename, 0) || isequal(Pathname, 0)
return;
end
显示图像
cla reset;
cla reset;
'Box', 'on', 'Color', 'c', 'XTickLabel', '', 'YTickLabel', '');
'Box', 'on', 'Color', 'c', 'XTickLabel', '', 'YTickLabel', '');
'String', '');
存储
fileurl = fullfile(Pathname,Filename);
Img = imread(fileurl);
[], 'Parent', handles.axes1);
'String', '验证码图像');
fileurl; =
Img; =
handles);
--- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
hObject handle to pushbutton2 (see GCBO)
eventdata reserved - to be defined in a future version of MATLAB
handles structure with handles and user data (see GUIDATA)
if isequal(handles.Img, 0)
return;
end
Img = handles.Img;
颜色空间转换
hsv = rgb2hsv(Img);
h = hsv(:, :, 1);
s = hsv(:, :, 2);
v = hsv(:, :, 3);
定位噪音点
bw1 = h > 0.16 & h < 0.30;
bw2 = s > 0.65 & s < 0.80;
bw = bw1 & bw2;
过滤噪音点
Imgr = Img(:, :, 1);
Imgg = Img(:, :, 2);
Imgb = Img(:, :, 3);
255; =
255; =
255; =
去噪结果
Imgbw = cat(3, Imgr, Imgg, Imgb);
[], 'Parent', handles.axes2);
'String', '验证码图像去噪');
Imgbw; =
handles);
--- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
hObject handle to pushbutton3 (see GCBO)
eventdata reserved - to be defined in a future version of MATLAB
handles structure with handles and user data (see GUIDATA)
if isequal(handles.Imgbw, 0)
return;
end
Imgbw = handles.Imgbw;
灰度化
Ig = rgb2gray(Imgbw);
二值化
Ibw = im2bw(Ig, 0.8);
常量参数
sz = size(Ibw);
cs = sum(Ibw, 1);
mincs = min(cs);
maxcs = max(cs);
masksize = 16;
初始化
S1 = []; E1 = [];
1对应开始,2对应结束
flag = 1;
s1 = 1;
tol = maxcs;
while s1 < sz(2)
for i = s1 : sz(2)
移动游标
s2 = i;
if cs(s2) < tol && flag == 1
达到起始位置
flag = 2;
S1 = [S1 s2-1];
break;
elseif cs(s2) >= tol && flag == 2
达到结束位置
flag = 1;
E1 = [E1 s2];
break;
end
end
s1 = s2 + 1;
end
图像反色
Ibw = ~Ibw;
图像细化
Ibw = bwmorph(Ibw, 'thin', inf);
for i = 1 : length(S1)
图像裁剪
Ibwi = Ibw(:, S1(i):E1(i));
面积滤波
num] = bwlabel(Ibwi);
stats = regionprops(L);
Ar = cat(1, stats.Area);
ind_maxAr] = max(Ar);
recti = stats(ind_maxAr).BoundingBox;
recti(1) + S1(i) - 1; =
recti(2); =
recti(3); =
recti(4); =
recti; =
图像裁剪
Ibwi = imcrop(Ibw, recti);
rate = masksize/max(size(Ibwi));
Ibwi = imresize(Ibwi, rate, 'bilinear');
ti = zeros(masksize, masksize);
rsti = round((size(ti, 1)-size(Ibwi, 1))/2);
csti = round((size(ti, 2)-size(Ibwi, 2))/2);
rsti+size(Ibwi,1), csti+1:csti+size(Ibwi,2))=Ibwi; :
存储
ti; =
end
[], 'Parent', handles.axes2); hold on;
for i = 1 : length(Rect)
Rect{i}, 'EdgeColor', 'r', 'LineWidth', 2);
end
hold off;
'String', '验证码数字定位');
Ti; =
handles);
--- Executes on button press in pushbutton4.
function pushbutton4_Callback(hObject, eventdata, handles)
hObject handle to pushbutton4 (see GCBO)
eventdata reserved - to be defined in a future version of MATLAB
handles structure with handles and user data (see GUIDATA)
if isequal(handles.Ti, 0)
return;
end
加入红色边框
Ti = handles.Ti;
It = [];
spcr = ones(size(Ti{1}, 1), 3)*255;
spcg = ones(size(Ti{1}, 1), 3)*0;
spcb = ones(size(Ti{1}, 1), 3)*0;
spc = cat(3, spcr, spcg, spcb);
整合到一起
It = [It spc];
for i = 1 : length(Ti)
ti = Ti{i};
ti = cat(3, ti, ti, ti);
ti = im2uint8(mat2gray(ti));
It = [It ti spc];
end
[], 'Parent', handles.axes2); hold on;
'String', '验证码归一化');
--- Executes on button press in pushbutton5.
function pushbutton5_Callback(hObject, eventdata, handles)
hObject handle to pushbutton5 (see GCBO)
eventdata reserved - to be defined in a future version of MATLAB
handles structure with handles and user data (see GUIDATA)
if isequal(handles.Ti, 0)
return;
end
Ti = handles.Ti;
比对识别
fileList = GetAllFiles(fullfile(pwd, 'Databse'));
Tj = [];
for i = 1 : length(fileList)
filenamei = fileList{i};
name, ext] = fileparts(filenamei);
if isequal(ext, '.jpg')
ti = imread(filenamei);
ti = im2bw(ti, 0.5);
ti = double(ti);
提取不变矩特征数据
phii = invmoments(ti);
开始比对
OTj = [];
for j = 1 : length(Ti)
tij = double(Ti{j});
phij = invmoments(tij);
ad = norm(phii-phij);
filenamei; =
ad; =
OTj = [OTj otij];
end
Tj = [Tj; OTj];
end
end
生成结果
r = [];
for i = 1 : size(Tj, 2)
ti = Tj(:, i);
adi = cat(1, ti.ad);
ind] = min(adi);
filenamei = ti(ind).filename;
name, ext] = fileparts(filenamei);
name = name(1);
r = [r name];
end
'String', r);
--- Executes on button press in pushbutton6.
function pushbutton6_Callback(hObject, eventdata, handles)
hObject handle to pushbutton6 (see GCBO)
eventdata reserved - to be defined in a future version of MATLAB
handles structure with handles and user data (see GUIDATA)
弹出对话框输入正确数值
choice = questdlg('确定要更新验证码样本库?(请在识别有错误的情况进行更新!)', ...
...
'确定','取消','取消');
switch choice
case '确定'
prompt={'请输入正确的验证码:'};
name='手动入库';
numlines=1;
defaultanswer={''};
answer=inputdlg(prompt,name,numlines,defaultanswer);
if isempty(answer)
return;
end
if isequal(handles.fileurl, 0)
return;
end
入库
fileurl = handles.fileurl;
answer = answer{1};
fileout = fullfile(pwd, sprintf('images/%s.jpg', answer));
flag = 1;
while 1
if exist(fileout, 'file')
fileout = fullfile(pwd, sprintf('images/%s_%d.jpg', answer, flag));
flag = flag + 1;
else
copyfile(fileurl,fileout);
fileout), '提示信息', 'modal');
break;
end
end
case '取消'
return;
end
--- Executes on button press in pushbutton7.
function pushbutton7_Callback(hObject, eventdata, handles)
hObject handle to pushbutton7 (see GCBO)
eventdata reserved - to be defined in a future version of MATLAB
handles structure with handles and user data (see GUIDATA)
退出菜单
choice = questdlg('确定要退出系统?', ...
...
'确定','取消','取消');
switch choice
case '确定'
close;
case '取消'
return;
end
--- Executes on button press in pushbutton8.
function pushbutton8_Callback(hObject, eventdata, handles)
hObject handle to pushbutton8 (see GCBO)
eventdata reserved - to be defined in a future version of MATLAB
handles structure with handles and user data (see GUIDATA)
GetDatabase();
function edit1_Callback(hObject, eventdata, handles)
hObject handle to edit1 (see GCBO)
eventdata reserved - to be defined in a future version of MATLAB
handles structure with handles and user data (see GUIDATA)
Hints: get(hObject,'String') returns contents of edit1 as text
str2double(get(hObject,'String')) returns contents of edit1 as a double
--- Executes during object creation, after setting all properties.
function edit1_CreateFcn(hObject, eventdata, handles)
hObject handle to edit1 (see GCBO)
eventdata reserved - to be defined in a future version of MATLAB
handles empty - handles not created until after all CreateFcns called
Hint: edit controls usually have a white background on Windows.
See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
--- Executes on button press in pushbutton9.
function pushbutton9_Callback(hObject, eventdata, handles)
hObject handle to pushbutton9 (see GCBO)
eventdata reserved - to be defined in a future version of MATLAB
handles structure with handles and user data (see GUIDATA)
uiputfile({'*.jpg;*.tif;*.png;*.gif','All Image Files';... =
Files' },'Save Image',...
'screen.jpg'));
if isequal(FileName, 0) || isequal(PathName, 0)
return;
end
f = getframe(gcf);
f = frame2im(f);
fullfile(PathName, FileName));
'提示信息', 'modal');
往期回顾>>>>>>
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