How can I check a specific axes has an image or not ?

I am using app designer in Matlab 2018a and I replaces a button for testing which is disable.

I know how to enable it but I want to enable it when I have an image on axis.

Answer 1

[Kevin Phung]

you can get the 'Children' property of the axes.

axes_handle.Children
%or
get(axes_handle,'Children')

[Walter Roberson]

findobj(axes_handle , 'type', 'image')

however it would probably make more sense to enable it when you put the image in

[Ahmer Shahid]

Thank you bro its working. I use this in app designer like this.

 if ~isempty(get(app.UIaxis,'Children'))
              set(app.pushbutton,'Enable','on');    
              end 

[Walter Roberson]

That does not say that there is an image in the axes, just that there is something that is not in the axis that is not hidden.

[Ahmer Shahid]

May be you are right So, Have you any solution ?

[Walter Roberson]

if ~isempty(findobj(app.UIaxis.Children, 'type', 'flat', 'type', 'image'))

or

any(arrayfun(@(x)isa(x,'matlab.graphics.primitive.Image'),ax.Children))

[Ahmer Shahid]

Thank you very much.

Answer 2

[Image Analyst]

What you accepted as the answer is really not the answer as Walter explained. You can use getimage() and check for zero-sized image. Here's a demo:

% Have either plot() or imshow() - comment out one of them.
% Put something into an axes that is NOT an image.
% plot(1:10)
% Put something into an axes that IS an image.
imshow('moon.tif')

% Check what's in the axes.
theImage = getimage();
whos theImage
if size(theImage, 1) ~= 0
	msgbox('There is an image in there');
else
	msgbox('There is no image in there');
end

[Ahmer Shahid]

You are also right Thank you.

[Image Analyst]

You're welcome. You can also than people by clicking the "Vote" link under their icon.

[Ahmer Shahid]

I'm done with it.

Thanks Again.