find out the orientation, length and radius of curved rectangular object

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I have a image as shown as fig.1.I am trying to fit this binary image with a curved rectangular (fig.2)to figure out:
1. the orientation (the angle between the long axis and the horizontal axis of the curved rectangle)
2. the length (l) and radius (R) of the object. What is the best way to do it?
My very naive idea is using least square fit to fit the boundary of the object and find out these information. However it turns out there is no equation for capped rectangle. In matlab there is a function called rectangle can create the capped rectangle perfectly however it seems just for the plot purpose and can not be implanted into the least square fit. Any help or clue is greatly appreciated.
Thanks for the help.

Antworten (2)

Ryan am 19 Jul. 2012
Have you looked at MF regionprops()?
  2 Kommentare
Tai-Yen Chen
Tai-Yen Chen am 19 Jul. 2012
Yes, Walter is right. I do check the regionprops but did not meet my purpose.

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Image Analyst
Image Analyst am 19 Jul. 2012
Bearbeitet: Image Analyst am 19 Jul. 2012
John D'Errico's File Exchange has a minimum bounding rectangle function The rectangle can be at any angle. I think this should give you what you want, or close enough (especially considering the very low resolution of your image).
  1 Kommentar
Tai-Yen Chen
Tai-Yen Chen am 19 Jul. 2012
Hi image Analyst, This is indeed a great start. But just out of curiosity, if I do have a high resolution image, will you have other suggestion on solving this issue?

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