How to proceed with image processing in GUI?

Question

Gee Cheng Mun 2016-1-14

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https://ww2.mathworks.cn/matlabcentral/answers/263729-how-to-proceed-with-image-processing-in-gui

评论： Image Analyst 2016-1-15

I have set up a GUI whereby the first push button(Load a MRI image) is to allow the user to select any image. I would like to proceed with image processing using the selected image from the first pushbutton. I have other pushbuttons like 'image enhancement', 'roi detection'. How can I proceed with image processing using the selected image from the first pushbutton?

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Answer 1

Walter Roberson 2016-1-14

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https://ww2.mathworks.cn/matlabcentral/answers/263729-how-to-proceed-with-image-processing-in-gui#answer_206104

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.3F

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Gee Cheng Mun 2016-1-14

编辑：Walter Roberson 2016-1-14

在 MATLAB Online 中打开

I tried but I don't understand. I can't save the image and process it under the second pushbutton.

% --- Executes on button press in load_mri.
function load_mri_Callback(hObject, eventdata, handles)
path='G:\FYP2\';
filter='*.png;*.jpg;*.tif;*.png;*.gif';'All Image Files';
[selectedFile, selectedPath]=uigetfile(fullfile(path, filter));
handles.img=imread([selectedPath, selectedFile]);
axes(handles.axes2);
image(handles.img);
setappdata(load_mri, 'Load MRI Image'); %save the application data
% --- Executes on button press in enhancement.
function enhanchObjectement_Callback(hObject, eventdata, handles)
yourVariable = getappdata(load_mri, 'Load MRI Image')
mri=imread(yourVariable);
gray=rgb2gray(mri);
I=imadjust(gray);
imshow(I);

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Answer 2

Walter Roberson 2016-1-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/263729-how-to-proceed-with-image-processing-in-gui#answer_206109

在 MATLAB Online 中打开

Below I show proper use of both handles and setappdata

% --- Executes on button press in load_mri.
function load_mri_Callback(hObject, eventdata, handles)
    path='G:\FYP2\';
    filter='*.png;*.jpg;*.tif;*.png;*.gif';'All Image Files';
    [selectedFile, selectedPath]=uigetfile(fullfile(path, filter));
    [~, image_name, ~] = basename(selectedFile);
    image_file = fullfile(selectedPath, selectedFile);
    image_data = imread(image_name);
    axes(handles.axes2);
    image(image_data);
    %image name is small, you can afford to store it in handles
    handles.image_name = image_name;
    handles.image_file = image_file;
    guidata(hObject, handles);
    %image content could be big, do not store it in handles
    myfig = ancestor(hObject, 'figure');
    setappdata(myfig, 'Loaded_MRI_Image', image_data); %save the application data
% --- Executes on button press in enhancement.
function enhanchObjectement_Callback(hObject, eventdata, handles)
    myfig = ancestor(hObject, 'figure');
    mri = getappdata(myfig, 'Loaded_MRI_Image');   %it is already the image
    image_name = handles.image_name;
    gray = rgb2gray(mri);
    I = imadjust(gray); 
    imshow(I);
    title( sprintf('Contrast adjusted "%s"', image_name) );

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Gee Cheng Mun 2016-1-15

在 MATLAB Online 中打开

I am now able to load the image but not able to process it under enhancement, using the same loaded image.

Error using feval Undefined function 'enhancement_Callback' for input arguments of type 'struct'.

Error in gui_mainfcn (line 95) feval(varargin{:});

Error in Finaldraft (line 42) gui_mainfcn(gui_State, varargin{:});

Error in @(hObject,eventdata)Finaldraft('enhancement_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating uicontrol Callback

myfig = ancestor(hObject, 'figure');
mri = getappdata(myfig, 'Load_MRI_Image', image_data);   %it is already the image
gray = rgb2gray(mri);
I = imadjust(gray); 
imshow(I);
title( sprintf('Contrast adjusted "%s"', image_name) );

Image Analyst 2016-1-15

enhancement_Callback is not spelled the same as enhanchObjectement_Callback, so which is it? Which is the right name?

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Answer 3

Image Analyst 2016-1-14

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https://ww2.mathworks.cn/matlabcentral/answers/263729-how-to-proceed-with-image-processing-in-gui#answer_206202

You might try MAGIC: http://www.mathworks.com/matlabcentral/fileexchange/24224-magic-matlab-generic-imaging-component All that stuff is already worked out for you. You just put your analysis code into the function AnalyzeSingleImage. It handles all the rest from listing image names in a listbox to displaying them to batch processing them to sending results to Excel.