Abstract
In recent years spatial-frequency-based criteria (Optical Transfer Function and figures of merit based on it) have become widely used to define and describe imaging performance of optical systems. Over the same period electro-optical raster display systems have become ever more widely used. In applying spatial frequency criteria to raster display systems it is important to acknowledge the details of the image sensing mechanisms in the human visual system. When this is done it is found that there are serious limitations to the general applicability of spatial-frequency-based criteria. The paper summarises some properties of the human visual system which are important in assessing the raster display/ observer interface and outlines a mathematical model which attempts to define information transfer at this interface. Results of a highly controlled experiment aimed at confirming some of the interface characteristics are presented. The implications on such quality measures as the widely used thermal imager performance measure MRTD (minimum resolvable temperature difference) are discussed.
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