COMPUTATION OF THE MODULATION TRANSFER-FUNCTION OF PHOTOGRAPHIC MATERIALS BY THE EDGE FUNCTION-METHOD

The most important problems concerning the determination of Modulation Transfer Function (MTF) attained by the measurement and numerical tra nsformation of the optical density spatial distribution function on th e border between the image and the background are discussed. Apart fro m the basic sensitometric characterization of light sensitive material s designed for the information recording, MTF is one of the most impor tant methods of the estimation and diagnostic of these materials. From among numerous, known and practically applied schemes of the MTF dete rmination, the method based on the spatial distribution of the optical density measurement is the most important one. The above method is th e most useful one because of the relatively simple manner of its pract ical application, high precision and short time of obtaining the resul ts. In spite of these advantages and generally known theoretical base of the MTF estimation, there are still theoretical and practical probl ems connected with the measurements. Therefore, the analysis of algori thms of MTF estimation has been carried out and some changes and modif ications are proposed: Moreover, the application of the automatic algo rithm for the separation of computing and measurement disturbances is proposed. This algorithm permits further simplification of MTF estimat ion.