Distinctness of perceived three-dimensional form induced by modulated illumination: Effects of certain display and modulation conditions

Bergström, Sten Sture; Gustafsson, Karl-Arne; Jakobsson, Torbjörn

doi:10.3758/bf03211741

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…In a study of the 3-D shape induced on flat displays by space-modulated illumination patterns projected onto them, Bergstrom, Gustafsson, and Jakobsson (1993) found that structure (number of reflectance/illuminance edge intersections) was an important factor facilitating the distinctness of the induced 3-D shape (see also Bergstrom, Gustafsson, & Putaansuu, 1984, and discussion below). Assuming that, in our objects, better 3-D perception is coupled with better lightness constancy, Bergstrom et al's results may, on the surface, indicate that the conNote-For each subject and experiment, entries were obtained by summing up an error index for all experimental conditions.…”

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confidence: 99%

The perception of lightness in 3-D curved objects

Pessoa

Mingolla

Arend

1996

Perception & Psychophysics

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Lightness constancy in complex scenes requires that the visual system take account of information concerning variations of illumination falling on visible surfaces. Three experiments on the perception of lightness for three-dimensional (3-D) curved objects show that human observers are better able to perform this accounting for certain scenes than for others. The experiments investigate the effect of object curvature, illumination direction, and object shape on lightness perception. Lightness constancy was quite good when a rich local gray-level context was provided. Deviations occurred when both illumination and reflectance changed along the surface of the objects. Does the perception of a 3-Dsurface and illuminant layout help calibrate lightness judgments? Our results showed a small but consistent improvement between lightness matches on ellipsoid shapes, relative to flat rectangle shapes, under illumination conditions that produce similar image gradients. Illumination change over 3-Dforms is therefore taken into account in lightness perception.

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confidence: 99%

The perception of lightness in 3-D curved objects

Pessoa

Mingolla

Arend

1996

Perception & Psychophysics

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“…The effects of scene interpretation on lightness perception are often difficult to clarify in studies using simplified, two-dimensional stimuli, in which 3-D geometry and the distinction between illumination and surface reflectance are not explicitly represented. One problem is that observers may perceive brightness gradients as due either to spatial variation of the illumination or as a variation in object shape (Bergstrom et al 1993). Using simulated 3-D objects on CRT displays, Pessoa et al (1996) found that lightness constancy across object surfaces deteriorated when observers were unable to distinguish between illumination and reflectance gradients correctly.…”

Section: The Influence Of Scene Interpretationmentioning

confidence: 99%

An Empirical Study of the Traditional Mach Card Effect

Bloj

Hurlbert

2002

Perception

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The traditional achromatic Mach card effect is an example of lightness inconstancy and a demonstration of how shape and lightness perception interact. We present a quantitative study of this phenomenon and explore the conditions under which it occurs. The results demonstrate that observers show lightness constancy only when sufficient information is available about the light-source position, and the perceptual task required of them is surface identification rather than direct colour-appearance matching. An analysis and comparison of these results with the chromatic Mach card effect (Bloj et al 1999 Nature 402 877-879) demonstrate that the luminance effects of mutual illumination do not account for the change in lightness perception in the traditional Mach card.

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Ambiguities in Colour Constancy and Shape from Shading

et al. 1997

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A new visual phenomenon--called the AMBEGUJAS phenomenon--is presented, together with some descriptive data from two initial exploratory experiments. The phenomenon is basically one of shape from shading, but ambiguous as to both shape and colour. There are two spontaneously alternating and mutually exclusive perceived 3-D shapes, and--as the most surprising observation--the colour impressions of these two shapes are markedly different. The stimulus situation is very simple with two differently coloured illuminations (with sharp edges) adjacently cast onto a flat, grey striped surface. In one 3-D shape almost the whole chromatic content disappears, and the surface goes towards its veridically grey colour. In the other the perceived object assumes the two illumination colours as clear surface colours. The decolorised percept is interpreted as a striking example of colour constancy: a perceptual solution with the classical 'discounting of the illuminant'. Experiments show that the phenomenon is robust and appears in varying display layouts and different combinations of chromatic illuminations.

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Distinctness of perceived three-dimensional form induced by modulated illumination: Effects of certain display and modulation conditions

Cited by 3 publications

References 25 publications

The perception of lightness in 3-D curved objects

The perception of lightness in 3-D curved objects

An Empirical Study of the Traditional Mach Card Effect

Ambiguities in Colour Constancy and Shape from Shading

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