Hi all,

I'm trying to understand how log-polar sampling works.

By "log-polar sampling" I mean that I have a set of 2D points (x,y),

for each point I need to build a signature which depends on

the "log-polar" distribution of the other points relatively to this point.

The signature is built by taking a pixel (x,y), normalize all the other points

relatively to it ( making (x,y) the origin of the axis ), find the polar

representation of the other points, and sort them in bins.

The value of bins for the point is the signature.

This image may explains it better

Now, my problem is that I don't understand how to decide the maximium

radius. This image represent the polar tranformation, and the number of

bins (R and W)


It was taken from here.

Does anyone familiar with this field?

Thanks & Good day.