Redrawing an image in a UIAxes that has already been drawn

Hello, I am using Appedesigner where I have a ImageButtonDownCallback(app, source, eventargs) event that takes an image from a UIAxes and creates a ROI in UIAxes2. The ROI is created from the larger image on UIAxes centred around the mouse click coordinates. This works fine.

                   %Add ROI to UIAXES2
                   cla(app.UIAxes2,'reset');
                   n=str2num(app.ImageScalenEditField.Value);
                   [high,low] = Autoscale(app,ROI,n);          %My autoscale function       
                   app.myimage=imshow(ROI,[low,high],'Parent',app.UIAxes2)  %image creation  

My issue is, I also use the UIAxes2 to view plots from other analaysis and sometimes want to redraw the original ROI that was on the UIAxes2 with the same image scaling that was used in the original imshow. I thought I could some how use app.myimage like

                   imshow(app.myimage,'Parent',app.UIAxes2);  %image creation using previous settings

or

                   app.UIAxes2=app.myimage

Is this possible or do I have to fully calc and draw it again like

                   n=str2num(app.ImageScalenEditField.Value);
                   [high,low] = Autoscale(app,ROI,n);          %My autoscale function       
                   app.myimage=imshow(ROI,[low,high],'Parent',app.UIAxes2)  %image creation  

Thanks

Jason

Answer 1

[Geoff Hayes]

Hi Jason - from image created by imshow, the app.myData is an image object which (from the tests I did) may no longer be valid depending upon how you update the UIAxes2. You may want to try something like

%Add ROI to UIAXES2
cla(app.UIAxes2,'reset');
n=str2num(app.ImageScalenEditField.Value);
[high,low] = Autoscale(app,ROI,n);          %My autoscale function       
imageObject = imshow(ROI,[low,high],'Parent',app.UIAxes2)  %image creation  
app.myimage = imageObject.CData;

which you can then later show on the axes as

imshow(app.myimage,'Parent',app.UIAxes2);

[Jason]

Thats what I was looking for "CData"!

Thnak you Geoff

Jason