matlabmatlab-guidehandlematlab-guiobjecthandles

MATLAB GUI handles

I have question about using "handles" in Matlab Callback function. I don t know how to use the same thing twice. Please help me.

So,I build Matlab GUI and I have callback function for upload image:

function pushbutton2_Callback(hObject, eventdata, handles)

handles = guidata(hObject); 
[filename pathname]=uigetfile({'*.jpg';'*.bmp'},'File Selector'); 
image=strcat(pathname, filename)
handles.data1=imread(image)
axes(handles.axes1);
imshow(handles.data1);
set(handles.edit1,'string',filename)
set(handles.edit2,'string',pathname)
guidata(hObject, handles);

,and I have callback fuction for converting the same image to "Gray Scale":

function Gray_Callback(hObject, eventdata, handles)

handles = guidata(hObject); 
axes(handles.axes2);
img=handles.data1;
x=imread(img);

y=rgb2gray(x); %function to convert an rgb image to gray scale

imshow (y)
guidata(hObject, handles);

,but it doesn't work.

Does anyone know what I'm doing wrong?

Solution

  • Your first function says

    handles.data1=imread(image)

    Then your second function says

    img=handles.data1;
x=imread(img);

    Since img contains image data, not the name of a file, what does imread(img) mean?

    I presume you want to work directly with the image data img here, not use imread at all.