How to get the diameter of irregular image?

hi,I want to find the diameter of this image,can i use regionprops function? If I use to find majoraxis and minoraxis so which one i should choose for its diameter?Can someone help me?If u have any idea to idea or ways to find diameter then tell me.

TQ

[Jan]

How is the "diameter" of an irregular shape defined? Is it the largest straight line matching into the object? Or the mean length of all lines through the center?

[waffle]

the mean length of all lines through the center.can u help me?

Answer 1

[Image Analyst]

I think the mean cross sectional distance would be pretty close to the Equivalent Diameter which is returned from regionprops().

To find the maximum Feret diameter, see the attached demo.

Answer 2

[KSSV]

doc imdistline