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We break binocular redundancy spectrally by using filters that selectively attenuate different wavelength bands to yield effective cone sensitivities (i.e., the products of the cone sensitivities and the filter transmission spectra) that are different between the two eyes. This approach increases the number of effective cone types while preserving most spatial information. In this vein, the use of two simple band- pass filters was previously demonstrated to increase the dimensionality of color vision in dichromatic individuals (i.e., those with two functioning cone types)16. Conversely, the goal in the present work is to enhance the dimensionality of a trichromat’s visual system to beyond that of a typical human. Such an approach was briefly suggested by Cornsweet in 197017, but to our knowledge no specific design has been proposed or realized. We note that the use of even a single filter positioned in front of both eyes can help distinguish certain metamers17, with the caveat that previously distinguishable spectra can become metamers when viewed through the filter; that is, a similar number of metamers (usually more) are created as are destroyed. In contrast, the use of two filters might be used to decrease the overall number of possible metamers. For this work, if at least one of the two filters can be used to differentiate a pair of spectra, we consider the pair to no longer be metamers. Results and Discussion Filter Design and Construction The filter pair was designed using a standard psychophysical model to determine the perceived (monocular) colors corresponding to particular spectra2,18. The perceived colors were calculated using the International Commission on Illumination (CIE) 1931 2° standard-observer matching functions, and monocular color differences (e.g., between colors 1 and 2) were calculated in the CIELAB color space using a standard color-difference metric (see Methods for further details)2,19: 5PDF Image | Enhancing color vision by breaking binocular redundancy
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