How to work with GUI data , perform functions and see output in workspace?

Hello,

I would really appreciate if I can have some help. I have designed a GUI for my digital image processing project. I am struggling to get this handles and passing of arguments right. I load image from my file, then I have other push buttons, like filtering and thresholding. SO the goal is to paste my function under the specific callback and when GUI runs, the operator would click on filtername and then my code will execute and show output. I have tried few things, but the problem is I can't pass between function everything correctly. And when I use imfindcircle for detecting my optic disk in image, the [i j] index is a problem, and I can't evaluate what is wrong because there is no data in workspace to see.

Here is my code. How do I call the output image to next function so that it can perform ANOTHER operation on it. I tried setappdata and getappdata....

function Main_OpeningFcn(hObject, eventdata, handles, varargin)

handles.output = hObject; guidata(hObject, handles); set(gcf,'Position',get(0,'Screensize'));

% Retrieve default image and display it

Foto = 'C:\Users\nvg\Desktop\Hoofstuk 3\Matlab\images'; % default image

BeeldBestaan = exist(Foto,'file'); % test for existence of filenames

if (BeeldBestaan == 2) % if default image is found

OriginalRGB = imread(Foto); % read default image else OriginalRGB = zeros(1300,1500,3);

end

imshow(OriginalRGB,'parent',handles.OriginalImage); handles.OriginalRGB = OriginalRGB; % storage of main image in handles

% Update handles structure

guidata(hObject, handles);

function varargout = Main_OutputFcn(hObject, eventdata, handles)

varargout{1} = handles.output;

% --- Executes on button press in Load.

function Load_Callback(hObject, eventdata, handles)

FilterSpec = {'*.png'};

DefaultName = 'C:\Users\nvg\Desktop\Hoofstuk 3\Matlab\images';

[FileName,PathName,FilterIndex] = uigetfile(FilterSpec,'Image file selector',DefaultName);

if (FilterIndex >0)

    LeerNaam = strcat(PathName,FileName);                       % get filename

    OriginalRGB = imread(LeerNaam);                             % read image

    imshow(OriginalRGB,'parent',handles.OriginalImage);         % display image

    handles.OriginalRGB = OriginalRGB;                          

    guidata(hObject, handles);                                  % update handles

end

handles.OriginalRGB = OriginalRGB; guidata(hObject, handles);

setappdata(handles.Load,'image',OriginalRGB);

% --- Executes during object creation, after setting all properties.

function Main_CreateFcn(hObject, eventdata, handles)

% --- Executes on button press in Optic_disk.

function Optic_disk_Callback(hObject, eventdata, handles)

OriginalRGB = getappdata(handles.Load,'image');

handles.OriginalRGB = OriginalRGB;

guidata(hObject, handles);

red=OriginalRGB(:,:,1);

figure, imshow(red), title 'red channel of RGB image';

[centers, radii] = imfindcircles(red,[50 140],'Sensitivity',0.94, 'EdgeThreshold', 0.03);

% h= viscircles(centers,radii, 'EdgeColor','r');

[i j]=find(radii==max(radii(:)));

radii = getappdata(FindCirclesFig,'radii');

middelpunt=centers(i,:)

r=max(radii)+80;

xa=middelpunt(1);

ya=middelpunt(2);

th = 0:pi/50:2*pi;

xunit = r * cos(th) + xa;

yunit = r * sin(th) + ya;

figure, imshow(RGB);

hold on

sirkel_plot = plot(xunit, yunit);

hold off

Create a logical image of a circle with specified diameter, center, and image size.

imageSizeX = size(red,1);

imageSizeY =size(red,2);

[columnsInImage rowsInImage] = meshgrid(1:imageSizeY,1:imageSizeX);

% Next create the circle in the image.

centerX =xa;

centerY =ya;

radius = r;

circlePixels = (rowsInImage - centerY).^2 + (columnsInImage - centerX).^2 <= (radius.^2);

%optic disk inverted

Optic_disk = imcomplement(circlePixels);

Answer 1

[Azzi Abdelmalek]

When you use variables x,y and z in one function and want to pass them to another function. At the end of your function add

handles.x=x;
handles.y=y;
handles.z=z;
guidata(hObject,handles)

If you want to use x in another function, add at the beginning of your function

x=handles.x

and do not forget to update guidata if the value of x changes

guidata(hObject,handles)

[Valeska Pearson]

Thank you Azzi!