12. Color Perception: From Grassmann Codes to a Dual Code for Object and Illumination Colors

Mausfeld, Rainer

doi:10.1515/9783110806984.219

Cited by 49 publications

(38 citation statements)

References 15 publications

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“…The first one is necessary because targets embedded in uniform surrounds have been noted to assume a dual colour impression reminiscent of perceptual transparency (Metelli, 1970), particularly when the contrast between target and surround is low Masin & Idone, 1981;Brown & MacLeod, 1997;Mausfeld, 1998;Ekroll et al, 2002Ekroll et al, , 2004. According to our experience, the target is then perceived as consisting of two layers, whereby one layer is perceived as coextensive with the target region and the other as extending across both the target and the surround.…”

Section: Introductionmentioning

confidence: 81%

New Laws of Simultaneous Contrast?

Ekroll

Faul

2012

Seeing and Perceiving

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Drawing on many seemingly disparate and unrelated lines of evidence, we argue that the direction of the simultaneous contrast effect in three-dimensional colour space is given by the difference vector between target and surround ('direction hypothesis'). This challenges the traditional idea according to which the direction of the simultaneous contrast is complementary to the colour of the surround ('complementarity law'). We also argue that the size of the simultaneous contrast effect is either constant or decreases with the difference between target and surround in three-dimensional colour space. The latter proposal challenges Kirschmann's fourth law. Within our theoretical framework, the universally presumed validity of the complementarity law and Kirschmann's fourth law can be understood as resulting from the failure to take various confounding factors into account when interpreting empirical data, the most prominent of which is the influence of temporal von Kries adaptation.

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Section: Introductionmentioning

confidence: 81%

New Laws of Simultaneous Contrast?

Ekroll

Faul

2012

Seeing and Perceiving

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“…(c) Representation of surfaces and illuminants An interesting issue is whether an observer can represent, simultaneously, the colour of a surface and that of the light illuminating it (Arend 1994;Mausfeld 1998;MacLeod 2003). Rather than discounting the illuminant, would it not be more desirable to recognize that surfaces were being viewed under different illuminants, to infer the relative properties of different illuminants, and the identity of surfaces across illuminant changes (e.g.…”

Section: Cone Sensitivities S(λ) M(λ) L(λ)mentioning

confidence: 99%

Sensory, computational and cognitive components of human colour constancy

Smithson

2005

Phil. Trans. R. Soc. B

182

133

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When the illumination on a scene changes, so do the visual signals elicited by that scene. In spite of these changes, the objects within a scene tend to remain constant in their apparent colour. We start this review by discussing the psychophysical procedures that have been used to quantify colour constancy. The transformation imposed on the visual signals by a change in illumination dictates what the visual system must 'undo' to achieve constancy. The problem is mathematically underdetermined, and can be solved only by exploiting regularities of the visual world. The last decade has seen a substantial increase in our knowledge of such regularities as technical advances have made it possible to make empirical measurements of large numbers of environmental scenes and illuminants. This review provides a taxonomy of models of human colour constancy based first on the assumptions they make about how the inverse transformation might be simplified, and second, on how the parameters of the inverse transformation might be set by elements of a complex scene. Candidate algorithms for human colour constancy are represented graphically and pictorially, and the availability and utility of an accurate estimate of the illuminant is discussed. Throughout this review, we consider both the information that is, in principle, available and empirical assessments of what information the visual system actually uses. In the final section we discuss where in our visual systems these computations might be implemented.

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“…Empirical and theoretical evidence (cf. Mausfeld & Niederée, 1993;Mausfeld, 1998) suggests regarding centre-surround type configurations as ʹminimalʹ stimuli, as it were, for triggering, albeit in rudimentary form, representations that are based on the representational primitives ʹobject colourʹ and ʹillumination colourʹ.…”

Section: Example I: the Problem Of Colour Constancymentioning

confidence: 99%

“…Helmholtzʹ observation that ʺcolours that can be seen at the same location of the visual field one behind the otherʺ, point to much deeper principles of the visual system than those of some re-normalizing of the local colour code or the visual systemʹs alleged propensity to keep its colour equivalence classes congruent with the physical structure of ʹreflectances of surfacesʹ (cf. Mausfeld, 1998). In the early literature several promising attempts were made to identify these structural principles, e.g.…”

Section: Example V: Colour Constancy From a Computational Point Of Viewmentioning

confidence: 99%

The Physicalistic Trap in Perception Theory

Mausfeld¹

2002

Perception and the Physical World

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12. Color Perception: From Grassmann Codes to a Dual Code for Object and Illumination Colors

Cited by 49 publications

References 15 publications

New Laws of Simultaneous Contrast?

New Laws of Simultaneous Contrast?

Sensory, computational and cognitive components of human colour constancy

The Physicalistic Trap in Perception Theory

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