“Compression” of retinal responsivity: V-LogI functions and increment thresholds

A key problem in vision is to normalize one's lightness scale so that surface reflectances are always assigned the same gray value regardless of the illumination level. The solution requires an assessment of the relation between the strength of the illuminant and the strength of the image signal-information that is not available in the image alone. However, the level of scattered light in the optical system does provide an independent measure of the illuminant strength, and can be used to solve the lightness scale normalization problem. To do this requires a comparison between two imaging systems, each of which respond differently to the internal optical scatter. The rod and cone systems have properties that are ideally suited for such a role.

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The derivation of nerve signals from contrast flash data

Walraven

1980

Biol. Cybernetics

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This paper presents a new analysis of the contrast flash data of Alpern et al. (1970a--d). It was prompted by the criticism of Wandell (1976) who pointed out that Alpern et al., main conclusion, i.e, that the inhibitory signal N (phi) elicited by the contrast flash (phi) takes the form (formula: see text), would imply an unrealistic excitatory photo response. The present analysis shows the data to be consistent with an inhibitory signal of the form (formula: see text).

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“Compression” of retinal responsivity: V-LogI functions and increment thresholds

Cited by 10 publications

References 16 publications

Forced to quit: Sexual harassment complaints and agency response

Forced to quit: Sexual harassment complaints and agency response

Why rods and cones?

The derivation of nerve signals from contrast flash data

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