How to visualize MajorAxisLength and MinorAxisLength on images?

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Hi,
I would like to replicate something similar to that shown in the explanation of "Orientation" property of the "regionprops" function, as viewable here:
I would plot the red ellipse and the blue lines representing the axes, over my images (both binary and grayscale). I found this example:
but I can't understand how complete the code to plot the blue lines. Could anyone help me, please?
Thanks for your answers.

采纳的回答

Image Analyst
Image Analyst 2016-7-12
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-').
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hu
hu 2018-1-14
Is it possible to modify the code so I can see how to run it on image contain several objects (like rice.png)?
Thanks a lot.

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