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How to update the value of a handles?

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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

Accepted Answer

Image Analyst
Image Analyst on 16 Oct 2015
You need to call guidata(). See the documentation.

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