image - 如何在 MATLAB GUI 中显示所需的图像？

Question

我有一个 GUI，如下所示：

我想在对比度增强后显示的图像上应用 Otsu 阈值。但是每当我按下 Otsu 阈值的应用按钮时，Otsu 阈值将应用于原始图像而不是对比度增强后的图像（请参阅随附的 GUI 和编码）。那么我该如何克服这个问题呢？

function pushbutton10_Callback(hObject, eventdata, handles)
I = im2double(handles.im);
imshow(I);
% prompts for the two inputs
prompt = {'Enter LOW contrast limit:','Enter HIGH contrast limit:'};
% title of the dialog box
dlg_title = 'Input';
% number of input lines available for each variable
num_lines = 1;
% default answer for each input
defaultans = {'0','1'};
% generate the dialog box and wait for answer
answer = inputdlg(prompt,dlg_title,num_lines,defaultans);
% convert string answers into doubles
lo_in = str2double(answer{1});
hi_in = str2double(answer{2});
% apply on image
K = imadjust(I,[lo_in hi_in],[]);

axes(handles.axes2);
imshow(K);
axes(handles.axes3);
imshow(K);



function pushbutton12_Callback(hObject, eventdata, handles)
I = im2double(handles.im);
im = rgb2gray(I);
level = graythresh(im)
a = im2bw(im,level);
axes(handles.axes3);
imshow(a);
axes(handles.axes4);
imshow(a);

Answer 1

我认为最好在函数中为handles结构定义一些字段，如下所示openingFcn

handles.OriginaImage=0;
handles.afterEnhancement=0;

当您阅读原始图像时，您将更新handles.OriginalImage为以下代码

handles.OriginalImage=imread("whatever.whatever");
% don't forget below line because this line update handles structure
guidata(hObject,handles) 

当您应用对比度增强时，您将其保存handles.afterEnhancement并再次更新handles结构

lo_in = str2double(answer{1});
hi_in = str2double(answer{2});
% apply on image
handles.afterEnhancement = imadjust(handles.OriginalImage,[lo_in hi_in],[]);
guidata(hObject,handles)

然后在 pushbutton12_callback 中，您可以通过以下方式在增强图像上应用 otsu 方法handles.afterEnhancement

I = im2double(handles.afterEnhancement);
im = rgb2gray(I);
level = graythresh(im)
a = im2bw(im,level);
axes(handles.axes3);
imshow(a);

我MATLAB以我的方式测试这些代码

示例代码

function varargout = Sdfl(varargin)
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
               'gui_Singleton',  gui_Singleton, ...
               'gui_OpeningFcn', @Sdfl_OpeningFcn, ...
               'gui_OutputFcn',  @Sdfl_OutputFcn, ...
               'gui_LayoutFcn',  [] , ...
               'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
   [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
   gui_mainfcn(gui_State, varargin{:});
end

function Sdfl_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
handles.original_image=0;
handles.blur_image=0;
% Update handles structure
guidata(hObject, handles);

function varargout = Sdfl_OutputFcn(hObject, eventdata, handles) 
varargout{1} = handles.output;

function pushbutton1_Callback(hObject, eventdata, handles)
handles.original_image=imread('pout.tif');
guidata(hObject, handles); %this line will update handles structure
axes(handles.axes1)
imshow(handles.original_image)

function pushbutton2_Callback(hObject, eventdata, handles)
handles.blur_image=imadjust(im2double(handles.original_image),[0.3 0.7],[]);
guidata(hObject, handles);
axes(handles.axes2)
imshow(handles.blur_image);

function pushbutton3_Callback(hObject, eventdata, handles)
thresh=graythresh(handles.blur_image);
bw_image=im2bw(handles.blur_image,thresh);
axes(handles.axes3)
imshow(bw_image);

输出