Compensation of the Dispersion of Optical Systems with Crude A-Priori Knowledge of the Input Signal

Abstract

All real optical systems are dispersive systems which can be seen from the fact that abrupt changes from white to black in gray level images are smoothed by the optical system so that the processed image shows unsharpness at its edges. In principle this disadvantage can be overcome by a more precise fabrication of the optical lens system. Since this involves a significant increase in manufacturing cost means of digital signal processing are looked for to compensate the dispersive effect of the optical system. The bandwidth of the input signal is normally unknown for the optical system. Thus the dispersion problem for optical systems has to be solved with low-level a-priori knowledge of the input signal.