\textbf{sourcecode} \href{https://github.com/Arktthul/Measuring-the-membrane-porosity-on-microalgae-Under-progress/blob/master/MicroAlgues_Part04.ijm}{< MicroAlgues_Part04.ijm>}  

sourcecode : part 4

2. Creation of concentric rings

Different methods can be applied to create concentric rings.  Constant radius displacement, constant areas. This can be done with a normalisation by the size of the microalgae.
Each one can be interesting and supported by different diffusion models : free diffusion, viscosity model and depends of primay knowledge on the organism.
We approximate the microalgae as a circle for which the radius can be retrieved by measuring the area. We compute a variable Diff that will be depending on the circle number.
We decided to realise ten concentric rings for which each donut new Rois will have the same approximative area. This piece of code create ten new circles each of them slightly smaller.