MATLAB: Imshow inhibits gui from running minimized

imshow minimized refresh foreground

I have an question concerning the imshow command for GUI. I am processing a lot images and wanted to display the current image using the axes feature. It works fine, only that the whole window gets refreshed everytime a new image is processed. Thats why i can't minimize the window which stays always in the foreground.

What could i do to avoid this?

Code looks like this: It reads some images, does the processing and safes them afterwards.

function execute_Callback(hObject, eventdata, handles)
global filenames
global path
for i=1:length(filenames)
nfilename2=[path,filenames{i}];
pic = imread(nfilename2);
axes(handles.axes1);
imshow(pic);
end

Thank you!

Best Answer

Specify the parent for imshow to plot to inside of imshow, rather than as axes(handles.axes1)

ax = gca;
imshow('cameraman.tif')

Hide figure

imshow('peppers.png','parent',ax)

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MATLAB: Updating multiple image axes with a timer – Images always load to new window not addressed one

Part 1

The problem is line 67:

% Setup timer object
handles.guifig = gcf;  %ME!!!
handles.timer = timer('Period', 1.0, 'ExecutionMode', 'FixedRate','TimerFcn', {@increment,handles.guifig});%.guifig
guidata(handles.guifig,handles);

When you call gcf a new figure is poofed to become the current figure. The reason for this is the GUIDE GUI's Figure's 'HandleVisibility' is set to 'off'. This is the GUIDE default and can be changed in GUIDE->tools->GUI Options.

So now you have a new figure created and you set the GUIDATA to this figure. Axes will be poofed on this figure and the rest explains the behavior you are seeing.

The simplest way to fix this is to set handles.guifig to be handles.figure1'. 'figure1' is the default tag for the gui figure. Of course this is redundant since now you'll have handles.guifig and handles.figure1 both pointing to the same thing. Thus the easiest (and probably best) fix is to rename the figure's tag to guifig in the GUIDE Property inspector. Or you could just go through your code and replace guifig with figure1, both work.

Part 2

As far as what IA was mentioning above with using:

imshow(the_image,'Parent',handles.axes1)

This is definitely a requirement so that imshow does not poof a new axes.

Alternatively, and this is what IA was hinting at, you can just set the 'CData' of the image to be different. For a robust real time application, I would argue that this the right way to do it. The reason for this is that it is faster and cleaner to change the coloring of an image than to delete that image and make a new image. As long as all of the other properties remain the same, we can skip the delete&repeat steps.

To do this, store the image handles in and update the 'CData' as necessary.

Here is a small example that outlines the idea.

hImage = imshow(cat(3,ones(200,400),zeros(200,400,2)));
T = timer('Period',1,'TasksToExecute',10,...
  'Timerfcn',@(~,~)set(hImage,'CData',circshift(get(hImage,'CData'),[0 0 1])),...
  'StartDelay',1,'ExecutionMode','FixedRate');
start(T);

MATLAB: How to retrieve image from axes1 and then load it into another axes by using pushbutton.

You can try this:

image1 = get(handles.axes1, 'CData');
imshow(image1, 'Parent', handles.axes2);

Best Answer

Related Solutions

MATLAB: Updating multiple image axes with a timer – Images always load to new window not addressed one

MATLAB: How to retrieve image from axes1 and then load it into another axes by using pushbutton.

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