MATLAB: How to update the value of a handles

Image Processing Toolboxstop handles

Dear all,

I have a GUI with a button that imports an "Old_image" and process it. I use this code in the first line of the button function

Old_image = handles.Old_image;  %import

After processing I get new image that I call "New_image".

I want, if I click this button again then do not import "Old_image" and just do the processing again for the "New_image".

Any idea how to do that? ( I can't use "getimage" function because no axes)

Thank you.

Meshoo

You need to call guidata(). See the documentation.

In the OpeningFcn callback of your GUI add below code

BkImage = importdata('backgnd.jpg'); %Read the image file
axes(handles.BkAxes);
image(BkImage);

Your two work arounds are right on. When you create the axis you want to plot into (possibly with subplot), it will return a handle ...

hax = subplot(2,2,1);

You need to save this handle (hax) into the app data. Then you can either call (your solution 1)

axes(hax)
plot(x, y)

or (your solution 2)

plot(hax, x, y)