A method of calculating the deviation relation of a population registered on an image includes: i.) identifying the objects in the image, ii.) counting the number of identified objects, iii.) identifying abnormalities in the image, iv.) identifying objects with abnormalities in the image, v.) counting the number of objects with abnormalities, vi.) calculating the relation of objects with abnormalities to all objects. A computer program, a handheld computer device, and a system are also provided.