Evaluation of polychromatic image quality by means of transfer function

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Abstract
The polychromatic optical transfer function requires a considerable amount of time for measurement and calculation, which reduces the possibilities of its being applied to the evaluation of opto-photographic systems. As a simplification the authors have suggested defining the polychromatic modulation transfer function (PMTF) as a relation of contrasts for sinusoidal tests of several spatial frequencies measured by means of a microdensitometer whose spectral chromatic response is analogous to the human eye. Criteria of quality were defined based on the PMTF and in order to study their efficiency in the evaluation of the image quality of colour opto-photographic systems the orders given by the criteria and by the eight observers were compared over a group of images corresponding to different conditions of aberrations. The criterion which gave the best evaluation of image quality was the integral of the product of the PMTF by the transfer function of the eye and by the weight function f( nu )= nu .

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