how can we find the length of an irregular shape in matlab

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I am here to ask a question. how can we find the length of an irregular shape in matlab.For example if we have so many objects(grains) in an image and want to get the length of each object. what will be the method to do. give me the right direction
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Cedric
Cedric on 12 Aug 2015
If you have an image that you could provide as an example, please insert it into your question using the image tool/icon (don't forget to click on [Insert Image] after you have chosen it).
halima jamil
halima jamil on 13 Aug 2015
this is the image of my problem. how we can find the length of each rice. as it is a irregular shape so which method will be better and how we can implement that. thanks

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Accepted Answer

Walter Roberson
Walter Roberson on 12 Aug 2015
regionprops() requesting the Perimeter value?
  6 Comments
Walter Roberson
Walter Roberson on 15 Aug 2015
When you used the major axis length, what part did you find was "not working" ?

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More Answers (1)

Image Analyst
Image Analyst on 14 Aug 2015
It seems as though you're up and running with major axis length (since you accepted that answer), but I'd do it differently. MajorAxisLength will give you the length of an ellipse fitted to your blob. If you want the actual length between the two farthest points, then you need to call bwboundaries() and compute all the distances and take the longest one. I do that in my attached demo. There is no built in function or option of MATLAB or regionprops() to do that, that's why I had to write it myself.
  7 Comments
Image Analyst
Image Analyst on 16 Nov 2018
Who are you talking to? What code? I attached my code. Code that does what?
See the link below:

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