imrotate in Matlab App Desinger

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monkey_matlab 2017-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/361121-imrotate-in-matlab-app-desinger

评论： monkey_matlab 2017-10-24

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Hello,

Is it possible to rotate an image in Matlab app designer?

I input an image using the following code:

% Code that executes after component creation
        function startupFcn(app)
            imag = imread('cameraman.tif');
            handles.I = imresize(imag,0.75);
            imshow(handles.I,'Parent',app.UIAxes)
        end

How to now rotate the image using a slider.

Under the slider code, I have tried the following but could not get it to work:

% Value changing function: SteeringSlider
        function SteeringSliderValueChanging(app, event)
            changingValue = event.Value;
              angle = round(event.Value);
              imshow( imrotate(app.UIAxes,angle,'bilinear','crop') );
          end

Can you tell me how to rotate an image in Matlab App Designer? Thanks.

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Answer 1

Rajesh Balagam 2017-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/361121-imrotate-in-matlab-app-desinger#answer_286198

编辑：Rajesh Balagam 2017-10-17

Refer to the answer in the following page:

https://www.mathworks.com/matlabcentral/answers/360834-rotate-image-in-matlab-app-designer

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Answer 2

Sean de Wolski 2017-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/361121-imrotate-in-matlab-app-desinger#answer_286199

在 MATLAB Online 中打开

You're calling imshow on the uiaxes not the image. I would manage this like this:

app.UIAxes = uiaxes; % You won't need this in app designer since it's already there
im = imread('cameraman.tif');
imh = imshow(im, 'Parent', app.UIAxes);
for angle = 0:10:360
  imh.CData = imrotate(im,angle,'bilinear','crop');
  pause(0.25)
end

Store imh and im as properties of your app.

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monkey_matlab 2017-10-23

编辑：monkey_matlab 2017-10-24

在 MATLAB Online 中打开

I tried your suggestion but still did not get the image to rotate.

Here is my code from App Designer:

properties (Access = public)
      imageData = imread('cameraman.tif'); % Description
      im
      imh
  end
    methods (Access = private)
        % Code that executes after component creation
        function startupFcn(app)
            %imshow(app.imageData,'Parent',app.UIAxes);
            %im = imread('cameraman.tif');
            imh = imshow(app.imageData, 'Parent', app.UIAxes);
        end
        % Callback function
        function SteeringSliderValueChanged(app, event)
        end
        % Value changed function: Steer_ValueEditField
        function Steer_ValueEditFieldValueChanged(app, event)
            %value = app.Steer_ValueEditField.Value;
            changingValue = app.SteeringSlider.Value;
        end
        % Value changing function: SteeringSlider
        function SteeringSliderValueChanging(app, event)
            changingValue = event.Value;
            angle = round(changingValue);
            app.imh.CData = imrotate(app.imageData, angle, 'bilinear', 'crop');
            drawnow limitrate
            % Set numeric display to latest slider value
            app.Steer_ValueEditField.Value = changingValue; 
        end

Sean de Wolski 2017-10-24

在 MATLAB Online 中打开

app.imh.CData = imrotate(app.imageData, ...)
drawnow limitrate

You're rotating the handle not the image data and also need to reference app. Also

monkey_matlab 2017-10-24

I edited the code as per your suggestion (see updated code above) but the image is still not rotating when I move the slider.

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imrotate in Matlab App Desinger

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