MATLAB: Read a image in a axes

axesimageMATLAB

hello all,

i am displaying a png image in an axes.

but i need to check whether image is present or not in the axes when i press my pushbutton. how do i do that

Best Answer

https://www.mathworks.com/help/images/ref/imhandles.html

imhandles() is one way.

However, if you have the axes handle, I would suggest

findobj(TheAxesHandle, 'type', 'image')

Related Solutions

MATLAB: Value of handles.axes in MATLAB GUI

You could try

if ~ishandle(handles.axes1)

However, if the axes exists but does not contain an image, the axes will still be a handle. But you can test

if isempty(findobj(handles.axes1, 'type', 'image'))

to see whether the axes contains an image

MATLAB: Ho to delete the image from the axes

You need to find the image in the axes with findobj() and then delete it. Like this:

axesHandlesToChildObjects = findobj(h, 'Type', 'image');
if ~isempty(axesHandlesToChildObjects)
  delete(axesHandlesToChildObjects);
end

You can't just call cla() or it will delete everything such as text, arrows, overlays, or other annotation you added. Try this full demo:

function test3
% Display an image.
imshow('moon.tif');
axis on;
% Add some text.
text(100,250, 'Moon', 'FontSize', 30, 'Color', 'r');
promptMessage = sprintf('Do you want to clear the image only?');
titleBarCaption = 'Continue?';
button = questdlg(promptMessage, titleBarCaption, 'OK', 'Cancel', 'OK');
if strcmpi(button, 'OK')
  % Get rid of image from current axes, but leave text.
  ClearImagesFromAxes(gca)
end
%=====================================================================
% Erases all images from the axes.
function ClearImagesFromAxes(h)
  axesHandlesToChildObjects = findobj(h, 'Type', 'image');
  if ~isempty(axesHandlesToChildObjects)
    delete(axesHandlesToChildObjects);
  end
  return; % from ClearImagesFromAxes

Best Answer

Related Solutions

MATLAB: Value of handles.axes in MATLAB GUI

MATLAB: Ho to delete the image from the axes

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