How to find the best circular fit for an irregular shape and define an average radious for it. The Goal is to define a fix distance from the weighed center and extract the ave

How to find the best circular fit for an irregular shape and define an average radious for it. The Goal is to define a fix distance on the radious e.g. (0.5 R) from the weighed center and extract the ave od data from those pixels.

Answer 1

[Abhiroop Rastogi]

Hi Ali Hariri,

For fitting a best circular fit for the data you have you choose from the resources given

1: A suite for minimal bounding objects

2: Circle Fit

3: Fit circles to data points in irregular images

The first two give you a fit if you have the data in coordinates form and the third one utilizes the image data itself.

Answer 2

[Matt J]

You can use circularFit(), available at

https://www.mathworks.com/matlabcentral/fileexchange/87584-object-oriented-tools-for-fitting-conics-and-quadrics

Or, you can use regionprops,

reg=regionprops(BW,'WeightedCentroid','PixelList');

averageRadius=mean(vecnorm(  reg.WeightedCentroid-reg.PixelList ,2,2));