Why the values of perimeter calculated using regionprops for Matlab 2010 and 2015 differ?

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The following code
a=zeros(5)
a(2,2)=1
a(2,3)=1
f=regionprops(a,'Perimeter')
when executed on Matlab 2010 , gives 2 as the value of perimeter.
But when I execute the same code on Matlab 2015 , the perimeter is 1.96.
Can anyone explain what is the reason of this difference.
For the record, Matlab 2010 is not rounding off the value.
Secondly, how regionprops calculate perimeter of an object in an image. I have read the help of this command but was unable to comprehend the method.

Accepted Answer

Ashish Uthama
Ashish Uthama on 26 May 2015
The release notes R2014a appears to explain that the newer value is more accurate.
  1 Comment
Waleed  Saqib
Waleed Saqib on 28 May 2015
Edited: Waleed Saqib on 28 May 2015
Thank you so much for your help. It really helped a lot.
Can you also explain how perimeter is calculated by Matlab? I mean how the distance is computed between two pixels.

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