How to visualize MajorAxisLength and MinorAxisLength on images?

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Nut 2016-7-12

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评论： Image Analyst 2018-1-15

Hi,

I would like to replicate something similar to that shown in the explanation of "Orientation" property of the "regionprops" function, as viewable here:

http://it.mathworks.com/help/images/ref/regionprops.html

I would plot the red ellipse and the blue lines representing the axes, over my images (both binary and grayscale). I found this example:

http://blogs.mathworks.com/steve/2010/07/30/visualizing-regionprops-ellipse-measurements/

but I can't understand how complete the code to plot the blue lines. Could anyone help me, please?

Thanks for your answers.

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采纳的回答

Image Analyst 2016-7-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/295135-how-to-visualize-majoraxislength-and-minoraxislength-on-images#answer_228423

Get the two endpoints of the line, then call plot. For example x1 = xCentroid + (majorAxisLength/2) * cosd(orientation). Same for y1, x2,and y2. It's just simple trigonometry. Then call plot([x1,x2], [y1,y2], 'r-').