Hi ANLI!
Could you upload a couple of sample images for us to look at? It would be best to get the "raw" and unprocessed images directly from the camera.
If I understand you correctly, you are trying to count the number of red blood cells, but you have problems with separating them, correct?
Have you tried using a distance transform or Danielson algorithm?
Or, are you using blob analysis with an erosion function?
I am trying to understand your problem better. Maybe it would also be good, if you could describe how you are attempting to do the segmentation of the image.
Best,
Markus Tarin