Help for cell detection

I need some help to detected cells on picture. In fact my works is to detected osteon cells on picture and then count and classify them.
I have to automated the image analysis because this analysis is currently done by hand and so a lot of time are lost.
The purpose of my study is to determine the orientation of collagen fibers in the osteon. If you look at the picture I made just below, you can see these different types of osteons. There are 4 types of osteon: dark, bright, alterning and hooped.

Any help is welcome because I am not an expert in image analysis.

thank you in advance

I don’t know if the picture is available so I post one with another extention

I’ve responded to your later post on the same topic here.