Resize using GUI(Axis) not correct type...

I have a GUI, where the image is loaded in and displayed in an axis. I need to resize the image (handles.axes1) using the input arguments (ImageHeight,ImageWidth). The code prior to this point works without error. But when it gets to the code below, it gives this error:

 AdjustedImage = imresize(handles.axes1,[ImageHeight,ImageWidth]);

 *Error using imresize
 Expected input number 1, A, to be one of these types:
   numeric, logical

 Instead its type was matlab.graphics.axis.Axes.

 Error in imresize>parsePreMethodArgs (line 333)
 validateattributes(A, {'numeric', 'logical'}, {'nonsparse', 'nonempty'},  mfilename, 'A', 1);*

How would I be able to resize, using the input Height and Width?

Thanks.

Answer 1

[Geoff Hayes]

JR - your first input to the imresize function is the handle to the axes1 object and isn't an image which is required by the re-sizing function. In order to get around this, you can try the following - save the image to the handles structure (whenever you load it), do the resize on this image, and then show the resized image in the axes.

Suppose that you load the image in the OpeningFcn of your GUI. You could do something like

 function myGui_OpeningFcn(hObject, eventdata, handles, varargin)

 handles.output = hObject;

 % load the image 
 myImg = imread('someImg.jpg');

 % display the image in the axes
 image(myImg,'Parent',handles.axes1);

 % add the image to the handles structure
 handles.myImg = myImg;

 % update the handles structure
 guidata(hObject, handles);

Now, in your callback that does the resizing, just do this

 % resize the image
 AdjustedImage = imresize(handles.myImg,[ImageHeight,ImageWidth]);

 % show the image in the axes
 image(AdjustedImage,'Parent',handles.axes1);

In the above I used image rather than imshow because I don't have the Image Processing Toolbox, so you can use whichever is convenient. Try implementing the above and see what happens!