Rotate image in Matlab app designer

67 views (last 30 days)
monkey_matlab
monkey_matlab on 11 Oct 2017
Commented: monkey_matlab on 23 Oct 2017
Hello,
I was able to get an image rotated using Matlab GUI. I am now trying to implement the same effects using Matlab App Designer. Can you direct me as to how I can go about rotating the image using App designer with a slider.
Here is an extract of the code putting the image in the UIaxes:
% Code that executes after component creation
function startupFcn(app)
imshow('cameraman.tif','Parent',app.UIAxes)
end
% Value changing function: SteeringSlider
function SteeringSliderValueChanging(app, event)
changingValue = event.Value;
end
How to now rotate the image?
Thanks.

Answers (1)

Rajesh Balagam
Rajesh Balagam on 16 Oct 2017
Edited: Rajesh Balagam on 16 Oct 2017
You need to store the image data in the app using a custom public property and access this data to rotate the image in the callback for slider.
Store the image data:
app.imageData = imread('cameraman.tif');
Rotate the image using imrotate function in slider callback:
rotatedImage = imrotate(app.imageData, changingValue);
Refer to this link ( https://www.mathworks.com/help/matlab/creating_guis/share-data-across-callbacks-in-app-designer.html) on how to share data between callbacks in appdesigner.
  1 Comment
monkey_matlab
monkey_matlab on 23 Oct 2017
This solution does not work.
Also, the link is not valid.
This is what I have tried as per your suggestion but still not working:
properties (Access = public)
imageData = imread('cameraman.tif'); % Description
end
methods (Access = private)
% Code that executes after component creation
function startupFcn(app)
imshow(app.imageData,'Parent',app.UIAxes);
end
% Value changed function: Steer_ValueEditField
function Steer_ValueEditFieldValueChanged(app, event)
%value = app.Steer_ValueEditField.Value;
changingValue = app.SteeringSlider.Value;
rotatedImage = imrotate(app.imageData, changingValue);

Sign in to comment.

Categories

Find more on Develop Apps Using App Designer in Help Center and File Exchange

Products

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!