IMAGE QUALITY INVESTIGATIONS BY MEANS OF PHOTODETECTOR ARRAYS

The design of modern photographic materials and systems with improved performance requires experimental investigations of image quality and image structure on a comparably high standard. By application of solid -state photodetector arrays as image scanners in microdensitometers th e methods of digital image capturing and processing have been introduc ed into photometrology. Examples are high-performance microdensitomete rs for the investigation of MTF and noise power spectra and a special granularity-density instrument for measuring optical density and rms g ranularity simultaneously and under standard conditions. A great varie ty of silver halide and non-silver image-recording materials were stud ied to analyze their efficiency and the physical limits of imaging. Fo r color films a good agreement of measured noise power spectra, dye cl oud density profiles, and rms(D) curves with the curves calculated fro m coating and coupler parameters was found.