The visually observable information is expressed in quantitive form according to an arrangement wherein there is firstly detected the distribution, size, shape and similar characteristics of objects appearing essentially in one level or plane of the sample and deviating visually from their environment. This detection is carried out by forming an image of the primary physical object on a light sensitive detector using known optic means, such as a microscope, in order to code the random information into a digital form, and thereupon the results of detection, that is the information thus brought into digital form, is transferred for further analysis to a computing and registering unit, such as a special purpose or process computer. Preferably, the detector unit comprises an array or matrix of light sensitive elements, such as photo-transistors.
Method and apparatus for analyzing a visible object