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Image not displayed properly in GUI

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Warid Islam
Warid Islam el 6 de Abr. de 2021
Comentada: Warid Islam el 6 de Abr. de 2021
I have created a Matlab GUI where I would display multiple images from a folder in the image axes at GUI. I could read all the image files. Unfortunately, the image axes in the GUI is blank as shown in the figure below. Any help would be appreciated.
function varargout = dm(varargin)
% DM MATLAB code for dm.fig
% DM, by itself, creates a new DM or raises the existing
% singleton*.
%
% H = DM returns the handle to a new DM or the handle to
% the existing singleton*.
%
% DM('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in DM.M with the given input arguments.
%
% DM('Property','Value',...) creates a new DM or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before dm_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to dm_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 dm
% Last Modified by GUIDE v2.5 06-Apr-2021 01:25:06
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @dm_OpeningFcn, ...
'gui_OutputFcn', @dm_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
% End initialization code - DO NOT EDIT
% --- Executes just before dm is made visible.
function dm_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 dm (see VARARGIN)
% Choose default command line output for dm
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes dm wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = dm_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 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)
myFolder = 'D:\regionGrowing_MLT\Images';
% Check to make sure that folder actually exists. Warn user if it doesn't.
if ~isfolder(myFolder)
errorMessage = sprintf('Error: The following folder does not exist:\n%s\nPlease specify a new folder.', myFolder);
uiwait(warndlg(errorMessage));
myFolder = uigetdir(); % Ask for a new one.
if myFolder == 0
% User clicked Cancel
return;
end
end
% Get a list of all files in the folder with the desired file name pattern.
filePattern = fullfile(myFolder, '*.jpg'); % Change to whatever pattern you need.
theFiles = dir(filePattern);
for k = 1 : length(theFiles)
baseFileName = theFiles(k).name;
fullFileName = fullfile(theFiles(k).folder, baseFileName);
fprintf(1, 'Now reading %s\n', fullFileName);
% Now do whatever you want with this file name,
% such as reading it in as an image array with imread()
imageArray = imread(fullFileName);
axes(handles.axes1);
imshow(imageArray); % Display image.
drawnow; % Force display to update immediately.
handles.imageArray=imageArray;
end
% Update handles structure
guidata(hObject, handles);
  3 comentarios
Rik
Rik el 6 de Abr. de 2021
You're overwriting handles.imageArray every iteration, and you're using the same axes object to show every image. I would also suggest passing the handle to axes directly to imshow, instead of what you are currently doing to ensure the proper parent object.
As for your folder selection: I would suggest splitting it into a different function that uses a while loop to check if the folder is valid.
Also, the attached images are just 1 pixel. Why do you expect to notice them anyway?
And I have probably linked this before, but GUIDE is about to be removed from Matlab. Anything non-trivial should not be designed with GUIDE. For general advice and examples for how to create a GUI (and avoid using GUIDE), have look at this thread.
Warid Islam
Warid Islam el 6 de Abr. de 2021
Hi @Rik,
You are right. I was wrong images in the GUI. That was quite silly from me. My GUI now works fine.

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