Modeling Contrast Thresholds

The application of the linear systems approach to the analysis of human spatial vision [1] began in earnest in the 1960’s, with estimates of the human contrast sensitivity function (CSF)[2]. Human visual system (HVS) models fall into two broad categories: single resolution and multi-resolution. Single resolution models typically use a low-pass (or a band-pass) filter as the first stage. These models have the advantage of computational simplicity but ignore much of what we have learned from neurophysiological and psychophysical studies. The CSF is also often used to scale mechanism sensitivity in standard multi-resolution HVS models [3].

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