1. A method for intracellular counting and segmentation of viral particles in an image, comprising: providing an image having a plurality of objects therein; identifying round objects in the image; sorting the identified round objects into groups; determining a radial density profile distribution of the identified round objects; identifying elliptical objects that are formable from the radial density profile distribution; sorting the identified elliptical objects into groups; and identifying viral particles among the sorted round and elliptical objects based on the radial density profile distribution of objects in a selected group of round and elliptical objects; exposing viral particles to a pharmaceutical drug; sorting the viral particles into groups after the exposure to the pharmaceutical drug; and analyzing a difference between the radial density profile distribution of viral particles before the exposure with a radial density profile distribution of viral particles after exposure to the pharmaceutical drug.