Using GUI, use one push button as an image browser and another to process the image that was chosen?

Hi, this is the very first time I use Matlab & post on a forum so please bare with me. Im working on creating a simple image processing program, I currently have a button that browses a directory for images and loads it. I want the next button to take the loaded image and perform image processing on it. I cannot figure out how to use the same image. This is what I have for the first button.

% --- Executes on button press in Load_Image.
function Load_Image_Callback(hObject, eventdata, handles)
axes(handles.axes1);
path = '[file path]';
filter = '*.jpeg';'*.jpg';'*.png';'*.bmp';
selectedFile = uigetfile(fullfile(path , filter));
imshow(selectedFile);

Answer 1

[Matthew]

Hi Ramadan,

This question really comes down to where do you want to store the information created by each of your callbacks. For the documentation addressing this look here.

One place to store the selected image information is in your handles structure.

% --- Executes on button press in Load_Image.
function Load_Image_Callback(hObject, eventdata, handles)
axes(handles.axes1);
path = '[file path]';
filter = '*.jpeg';'*.jpg';'*.png';'*.bmp';
selectedFile = uigetfile(fullfile(path , filter));
imshow(selectedFile);
handles.selectedFile = selectedFile;
% Update handles structure
guidata(hObject, handles);

% --- Executes on button press in Process_Image.
function Process_Image_Callback(hObject, eventdata, handles)
%Use handles structure to recall the selected file
selectedFile = handles.selectedFile;
%Do Image Processing here

Alternatives are to use the figures 'userdata' or application Data as described here. https://www.mathworks.com/help/matlab/creating_guis/share-data-among-callbacks.html

[Ramadan]

Thank you very much, I've managed to get it working !

Answer 2

[Niels]

there are several ways.

if you are using guide, you could just use the handlea structur and save the image within handles:

handles.image=selectedFile;

so if you update handles after each callback, you will be able to use this in every callback as well.

guidata(hObject, handles);

if you dont use guise i propose to save the imagedata within the figure with appdata. Name the figure (=Fig1 in example:)

%setappdata(FigureName,'Name',Variable)
setappdata(Fig1,'ImageSavings',selectedFile)

at the start of your 2nd callback function type

selectedFile=getappdata(Fig1,'ImageSavings');

to get the data you saved back

[Ramadan]

Thank you for the answer, I was using guide and managed to get it working by saving the image in the handles.

Answer 3

[Image Analyst]

I recommend you start with MAGIC. http://www.mathworks.com/matlabcentral/fileexchange/24224-magic-matlab-generic-imaging-component

It does all the "plumbing" for you - batch processing, listing images in a listbox, click to display then, button to select images folder, writing results to Excel, etc. You just plug your script (image analysis algorithm) into the "AnalyzeSingleImage" function.