How to use Vislabels() function in app designer to show the labels in an image?

Question

Anjan Goswami 2020-12-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/703557-how-to-use-vislabels-function-in-app-designer-to-show-the-labels-in-an-image

评论： Anjan Goswami 2020-12-28

I want to show a labeled image in a app.UIAxes object. I have tried several codes to fit the vislabels function so that I can see the labeling in my app's interface. Following is one of the examples which did not work as well.

vislabels(ImageName, 'Parent', app.UIAxesLabeledImage);

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Answer 1

Walter Roberson 2020-12-28

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/703557-how-to-use-vislabels-function-in-app-designer-to-show-the-labels-in-an-image#answer_585452

编辑：Walter Roberson 2020-12-28

在 MATLAB Online 中打开

Assuming you are using the File Exchange contribution https://www.mathworks.com/matlabcentral/fileexchange/19665-visualize-output-of-bwlabel then that contribution does not permit you to choose the output location. You would need to upgrade the code to permit an output location.

Note: the way that code uses imshow(), imshow() will delete the current axes if it detects that the current axes occupies the entire figure -- unless the axes has "hold" set on. Therefore you cannot just modify it to do

if nargin  == 1
    axesHandle = gca;
else
    axesHandle = InputAxes;
end
imageHandle = imshow(I, 'InitialMagnification', 'fit');

because invoked like that, it will look for the current axes of a traditional figure, and (probably) delete that.

However, you can use

if nargin  == 1
    axesHandle = gca;
else
    axesHandle = InputAxes;
end
imageHandle = imshow(I, 'InitialMagnification', 'fit', 'Parent', axesHandle);

because imshow() does not delete the current axes if you pass it as the parent.

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Anjan Goswami 2020-12-28

Thanks for your reply, sir. Yes, I have used the vislabels() function that you have mentioned. I have modified the vislabels() function with your recommendations and named it as vislabelsModified() function. Now, how should I call the function to show a labeled image in app.designer? What should be the command line to fit the image with the vislabelsModified() function to show it in app.UIAxes ? Sorry, for my ignorance if I could not catch you correctly,sir.

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