COMPUTER-AIDED PERFORMANCE EVALUATION OF AN INCOHERENT 2-DIMENSIONAL OPTICAL-IMAGE UNDER PRIMARY SPHERICAL-ABERRATION FROM THE ASPECT OF INFORMATIONAL CHANGE IN SPECTRAL FORM

The present article contains an extension of the investigations done s o far on the problems of the informational change by incoherent optica l imagery which often occur, for example, in the photographic practice . There is assumed a noiseless spherical dioptric optical imaging syst em with circular aperture the two-dimensional focused or defocused axi al incoherent image formation of which is influenced by the primary sp herical aberration. The considerations and results introduced relate t o the linear and isoplanatic condition for intensity of the quasi mono chromatic light. Informational change between the object and image pla ne is accepted for the image quality evaluation. This change is repres ented by the competent informational entropy loss expressed in the sui table spectral form. its values and graphical dependences are obtained by means of a computer for various values of the competent parameters . They endorse the idea of usefulness of the spectral form of informat ional entropy loss for suitable evaluation of the optical image perfor mance.