MATLAB: How to get image after displaying it in matlab GUI made from appdesigner

app designer

I have picked an image file and displayed it on UIAxes using the follwing code (in App Designer)

      imshow(img,'parent',app.UIAxes);

Now, can I know how to get the image shown in the app.UIAxes component(without always opening the file from path)?

I want to store it in a variable to perform image processing.

If you have the Image Processing Toolbox then

imhandles(app.UIAxes)

will return the handles of all images under app.UIAxes.

Alternately you can use

findobj(app.UIAxes, 'type', 'image')

If there is a possibility that their handle visibility is set off then

findall(app.UIAxes, 'type', 'image')

x = 1:10;
y = sin(x);
plot(app.UIAxes,x,y);

The ability to show images is new in R2016b, so you need to be on that release.

You use imshow by explicitly parenting to the uiaxes.

imshow('cameraman.tif','Parent',app.UIAxes)