Reshowing an image in a programmatic gui

Hi,

I have programmed a gui in which I use hImage = imshow(image) to show a binary image. Then I add some stuff to the image handle like scrollpanels and magnification box etc. I then make changes to the image itself (remove stains by changing some areas into ones (white)).

How can I show the image again in the same gui by replacing the old image with the new, edited image?

Using imshow(image) causes a long error log because of handle errors. Redefining hImage = imshow(new_image) along with all other functionalities (scrollpanels etc.) also causes errors.

-Ville

[Sean de Wolski]

Perhaps you could include some code. Are you using GUIDE?

Take a look at the axes command to get control of the axes directly.

[Ville]

No, I'm not using GUIDE. Here's the code I use in the beginning to show my image and add those scrollpanels etc.

handles.hImage = imshow(handles.opened_ecg_file); % Show the image

% Set image hittest to 'on' so that it will react to mouse button presses

set(handles.hImage, 'HitTest', 'on', 'ButtonDownFcn', @button_down_fcn);

% Create scroll panels

handles.hScrollPanel = imscrollpanel(handles.fig, handles.hImage);

set(handles.hScrollPanel, 'Units', 'normalized','Position', [0 .1 1 .9]);

% Create magnification box

handles.hMagBox = immagbox(handles.fig, handles.hImage);

%pos = get(handles.hMagBox, 'Position');

set(handles.hMagBox, 'Position', [510, 25, 70, 25]); % Position the box

handles.hCoords = impixelinfo(handles.fig, handles.hImage); % coords box

Now, if I edit the image and try to replace the old image with the new one, I get a lot of errors.

Answer 1

[Paulo Silva]

Everytime you use imshow you must also give that image the tools, example:

handles.fig=figure
handles.ax=axes
handles.hImage = imshow('trees.tif'); % Show the image 
% Set image hittest to 'on' so that it will react to mouse button presses 
set(handles.hImage, 'HitTest', 'on', 'ButtonDownFcn', @button_down_fcn);

% Create scroll panels 
handles.hScrollPanel = imscrollpanel(handles.fig, handles.hImage); 
set(handles.hScrollPanel, 'Units', 'normalized','Position', [0 .1 1 .9]);

% Create magnification box 
handles.hMagBox = immagbox(handles.fig, handles.hImage); 
%pos = get(handles.hMagBox, 'Position'); 
set(handles.hMagBox, 'Position', [510, 25, 70, 25]); % Position the box
handles.hCoords = impixelinfo(handles.fig, handles.hImage); % coords box

pause(2)

handles.hImage = imshow('cameraman.tif'); % Show the image 
% Set image hittest to 'on' so that it will react to mouse button presses 
set(handles.hImage, 'HitTest', 'on', 'ButtonDownFcn', @button_down_fcn);

% Create scroll panels 
handles.hScrollPanel = imscrollpanel(handles.fig, handles.hImage); 
set(handles.hScrollPanel, 'Units', 'normalized','Position', [0 .1 1 .9]);

% Create magnification box 
handles.hMagBox = immagbox(handles.fig, handles.hImage); 
%pos = get(handles.hMagBox, 'Position'); 
set(handles.hMagBox, 'Position', [510, 25, 70, 25]); % Position the box
handles.hCoords = impixelinfo(handles.fig, handles.hImage); % coords box

[Ville]

I have tried that too but I still get the errors.

[Sean de Wolski]

What errors? Be specific. If you run Paulo's code does it work?

[Ville]

Yes, Paulo's code runs if I run it as a separate program but I can't make my own code work the same way.

The error is:

??? Error using ==> get

Invalid handle object.

Error in ==> imscrollpanel>getVisibleImageRect at 568

xdata = get(hIm,'XData');

Error in ==> impixelinfoval>isCursorOutsideVisibleImage at 208

rect = api.getVisibleImageRect();

Error in ==> impixelinfoval>displayPixelInfo at 117

if isempty(him) || isCursorOutsideVisibleImage(him,x,y)

Error in ==> iptaddcallback>callbackProcessor at 146

fun(varargin{:});

??? Error using ==> waitfor

Error while evaluating figure WindowButtonMotionFcn

It repeats that same error multiple times on each run.

[Ville]

Deleting the old handles and redefining them afterwards seems to do the trick.

[Image Analyst]

MATLAB is case sensitive. So your "hIm" and "him" are different variables.