GUI

Hey, Im trying to build a GUI for the Quality Assessment tools of an X-Ray machine. In this , i have to load an image and then do various operations on it. I have created a push button to load my image and another push button to do operations on it. I have to send the image from the callback of the Load Push Button to the callback of the push button of the Operations. Please help me how to do this! Thanks a lot.

Gaurav

Answer 1

[Chandra Kurniawan]

Hi,

In callback of Load Push Button you should write like this :

handles.output = hObject;
[fn pn] = uigetfile('*.jpg','select image');
if fn ~= 0
    handles.I = imread(fullfile(pn,fn));
    imshow(handles.I);
end
guidata(hObject, handles);

In the other pushbutton, I will threshold the image.

And then in the other push button you can call the image by :

handles.output = hObject;
handles.bw = im2bw(handles.I);
imshow(handles.bw);
guidata(hObject, handles);

[hbanuqitah banuqitah]

can you please tell me tha sam thing if load image in axes and want other button to make operation to this image loaded by other pushbutton

Answer 2

[Image Analyst]

Try this image processing GUI framework. It will get you up to speed quickly:

http://www.mathworks.com/matlabcentral/fileexchange/24224

Description

This GUI will help the novice user get up to speed very quickly on using GUI-based applications. Everything is laid out in a very simple Step 1, Step 2, Step 3, etc. layout. It is a very good starting point for a typical image analysis application. This application uses GUIDE to do the user interface design, and has most of the basic controls such as buttons, listboxes, checkboxes, radio buttons, scrollbars, etc. It allows the user to select a folder of images, select one or more images and display them, to select a series of options, and to individually or batch process one or more images. The user can optionally apply a mask (region of interest) to the image so that only the area within the mask will be analyzed. The results are optionally sent to Excel. In this demo, I do some very basic particle sizing but in use, the user would replace that simple demo code in the function AnalyzeSingleImage() with their own code. Works with Windows or Unix since paths are all forward slashes. Requires the Image Processing Toolbox to do the simple particle sizing demo, but if you delete that demo code before using it, then the IP toolbox would not be required and it would still demonstrate the basic GUI-based file processing functionality.

Answer 3

[Gaurav Kaila]

Hey Chandra , Thanks for the help, I got it! Can you please help me out in another thing please, how do you create an array of HANDLES. i.e. if I have to get 6 (example) images to another callback, then what will the code be like. Should we use a for loop?? Thanks Again!

PS: Thanks Image Analyst!

[Chandra Kurniawan]

If I did not misunderstand,

what do you mean with 6 images?

Did you mean in 'Load Push Button' callback we have 6 different images?

[Gaurav Kaila]

Yes, i mean when i click the load push button , i should be able to load 6 images and transfer them to another function.

[Chandra Kurniawan]

You can use uigetfile with 'multiselect' -> 'on'

And when reading the image, you can use for loop

Eq:

handles.output = hObject;

[fn pn] = uigetfile('*.jpg','select image','multiselect','on')

if ~isempty(fn)

for x = 1 length(fn)

handles.I{x} = imread(fullfile(pn,fn{x}));

end

end

guidata(hObject, handles);

In another pushbutton callback, you can call the image by the index

Eq:

handles.output = hObject;

handles.bw = im2bw(handles.I{1});

imshow(handles.bw);

guidata(hObject, handles);

Answer 4

[Gaurav Kaila]

And another thing, if i want to show a particular numerical result on the GUI , ill use the EDIT TEXT BOX. rite?? Can you help me in that too.

Thanks!

[Chandra Kurniawan]

Eq : I need to show mean value of the image

handles.output = hObject;

handles.Imean = mean(handles.I((:));

set(handles.edit1,'string',num2str(handles.Imean));

guidata(hObject, handles);

Note : you must have uicontrol named edit1 in your GUI

[Gaurav Kaila]

Okay, Thanks!

Also if i need to enter a value in the GUI which i have to use in the program, Ill use a EDIT TEXT BOX. and then how to proceed with it??

Sorry but im really very new at GUI.

Thanks!

[Gaurav Kaila]

And the above that you wrote should be written in the Edit Text Box Function or the Mean Evaluation Funtion.

[Chandra Kurniawan]

You should place my code above in button callback (Mean Evaluation)

[Image Analyst]

I don't recommend that since it's a measurement, not something you want the user to change. If you don't want the user to edit your value, I'd use a static text control instead, and use set() to assign a string to it.

text1String = sprintf('The mean = %.3f', meanValue);

set(handles.text1, 'String', text1String);

Again, there are nice demos and framework for this in MAGIC.

[Gaurav Kaila]

oh okay! Thanks Guys.

One last thing, if i need to input a value in a edit text box in a GUI and use that value in the function program.What should be my code??

[Chandra Kurniawan]

a = str2double(get(handles.edit1,'string'));

now, you can pass 'a' in your function

Eq:

y = yourfunction(a)

[Gaurav Kaila]

This code is written in the edit text box callback or the mail function where the value is being used??

[Chandra Kurniawan]

You should place it not in edit callback.

[Gaurav Kaila]

I am writing this code in the main function, and it says

??? Error while evaluating uicontrol Callback

??? Error using ==> KGUI>data_Callback

Too many output arguments.

Error in ==> KGUI>data_Callback at 382

n = data_Callback ((str2double(get(handles.n,'string'))));

Error in ==> gui_mainfcn at 96

feval(varargin{:});

Error in ==> KGUI at 44

gui_mainfcn(gui_State, varargin{:});

Error in ==>

@(hObject,eventdata)KGUI('data_Callback',hObject,eventdata,guidata(hObject))

??? Error while evaluating uicontrol Callback

[Gaurav Kaila]

im writing it in the main function and it says too many output arguments. What to do??

[Chandra Kurniawan]

What is 'data_Callback'?

Your function?

Can you show me about 'data_Callback'?

[Gaurav Kaila]

I got it, Thanks a lot!