前言

由于做项目的时候需要对图片进行二值化，而且图片不同需要达到二值化的效果也不同，如果一直要在程序里试探阈值比较麻烦。所以想利用图像界面中的滑动条人工控制二值化阈值。

一、主要步骤

1、在matlab命令行输入guide,回车新建一个图形界面
2、在guide图像界面分别插入滑动条、坐标系、可编辑文本块、按钮。

3、在滑动条的属性检查器里根据需要调整最大值，最小值，默认值（max、min、value）

4、在相应的.m文件里插入功能代码

二、代码

function varargout = ThresholdImpactGuide(varargin)
% THRESHOLDIMPACTGUIDE MATLAB code for ThresholdImpactGuide.fig
%      THRESHOLDIMPACTGUIDE, by itself, creates a new THRESHOLDIMPACTGUIDE or raises the existing
%      singleton*.
%
%      H = THRESHOLDIMPACTGUIDE returns the handle to a new THRESHOLDIMPACTGUIDE or the handle to
%      the existing singleton*.
%
%      THRESHOLDIMPACTGUIDE('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in THRESHOLDIMPACTGUIDE.M with the given input arguments.
%
%      THRESHOLDIMPACTGUIDE('Property','Value',...) creates a new THRESHOLDIMPACTGUIDE or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before ThresholdImpactGuide_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to ThresholdImpactGuide_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 ThresholdImpactGuide% Last Modified by GUIDE v2.5 09-Mar-2022 16:45:10% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...'gui_Singleton',  gui_Singleton, ...'gui_OpeningFcn', @ThresholdImpactGuide_OpeningFcn, ...'gui_OutputFcn',  @ThresholdImpactGuide_OutputFcn, ...'gui_LayoutFcn',  [] , ...'gui_Callback',   []);
if nargin && ischar(varargin{1})gui_State.gui_Callback = str2func(varargin{1});
endif nargout[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
elsegui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT% --- Executes just before ThresholdImpactGuide is made visible.
function ThresholdImpactGuide_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 ThresholdImpactGuide (see VARARGIN)% Choose default command line output for ThresholdImpactGuide
handles.output = hObject;% Update handles structure
guidata(hObject, handles);% UIWAIT makes ThresholdImpactGuide wait for user response (see UIRESUME)
% uiwait(handles.figure1);% --- Outputs from this function are returned to the command line.
function varargout = ThresholdImpactGuide_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
varargout{1} = handles.output;% --- Executes on slider movement.
function slider1_Callback(hObject, eventdata, handles)
% hObject    handle to slider1 (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,'Value') returns position of slider
%        get(hObject,'Min') and get(hObject,'Max') to determine range of slider
global Img;
val=get(handles.slider1,'Value');
set(handles.edit1,'string',num2str(val));
Ig = im2double(Img);[m,n]=size(Ig);Ibr=imbinarize(Ig,val*graythresh(Ig));SE = strel('square',round(m/50)); %初步去噪，图片开运算（先腐蚀后膨胀），去除噪声If = imopen(Ibr,SE);imagesc(If,'Parent',handles.axes1);% --- Executes during object creation, after setting all properties.
function slider1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to slider1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called% Hint: slider controls usually have a light gray background.
if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))set(hObject,'BackgroundColor',[.9 .9 .9]);
endfunction 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 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)
trydelete(allchild(handles.axes1));
end
axes(handles.axes1); %指定需要清空的坐标轴
cla reset;
%载入图像
global Img;
[FileName PathName Index]=uigetfile({'*.jpg';'*,png';'*.bmp'},...'File Selector');
if ~Indexelseif IndexImg = imread([PathName FileName]);imagesc(Img,'Parent',handles.axes1);Img=rgb2gray(Img);end
end
global Img;

三、效果

这样就能通过按钮在文件夹中添加图片，再通过滑动条控制它二值化的阈值，其中可编辑文本可以实时的显示阈值。

注意：在显示二值化的过程中出现了色彩失真，好像是函数的原因，知道解决方法的可以底下评论！！

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matlab利用滑动条控制图片二值化阈值

前言

一、主要步骤

二、代码

三、效果

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