The role of chromatic contrast and luminance polarity in stereoscopic segmentation

Kingdom, Frederick A. A.; Li, Hyung-Chul O.; MacAulay, Elizabeth J

doi:10.1016/s0042-6989(00)00251-0

Cited by 6 publications

(5 citation statements)

References 12 publications

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“…Our results complement a number of previous findings exploring the role of color vision in texture-processing 21 22 and in other types of figure-ground relationship, such as the detection of global motion 15 23 24 25 26 27 28 29 , and stereoscopic targets embedded in multiple-depth distractors 30 . All these studies failed to find evidence for color-specific channels mediating the particular motion/form/depth task.…”

Section: Discussionsupporting

confidence: 87%

“…Croner and Albright 28 29 were the first to explore the effect of segregating target and distractors by color in global motion, and suggested that one explanation for the advantage in the segregated condition was that subjects were able to selectively attend to the target colour. Li and Kingdom 15 30 went on to directly test the attention-to-color idea using a global motion stimulus in which all pre-attentive cues as to the target color were removed, and found that global motion thresholds were no better when target and distractors differed in color. However, when subjects were cued as to the target color, performance increased.…”

Section: Discussionmentioning

confidence: 99%

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The role of color and attention-to-color in mirror-symmetry perception

Gheorghiu

Kingdom

Remkes

et al. 2016

Sci Rep

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The role of color in the visual perception of mirror-symmetry is controversial. Some reports support the existence of color-selective mirror-symmetry channels, others that mirror-symmetry perception is merely sensitive to color-correlations across the symmetry axis. Here we test between the two ideas. Stimuli consisted of colored Gaussian-blobs arranged either mirror-symmetrically or quasi-randomly. We used four arrangements: (1) ‘segregated’ – symmetric blobs were of one color, random blobs of the other color(s); (2) ‘random-segregated’ – as above but with the symmetric color randomly selected on each trial; (3) ‘non-segregated’ – symmetric blobs were of all colors in equal proportions, as were the random blobs; (4) ‘anti-symmetric’ – symmetric blobs were of opposite-color across the symmetry axis. We found: (a) near-chance levels for the anti-symmetric condition, suggesting that symmetry perception is sensitive to color-correlations across the symmetry axis; (b) similar performance for random-segregated and non-segregated conditions, giving no support to the idea that mirror-symmetry is color selective; (c) highest performance for the color-segregated condition, but only when the observer knew beforehand the symmetry color, suggesting that symmetry detection benefits from color-based attention. We conclude that mirror-symmetry detection mechanisms, while sensitive to color-correlations across the symmetry axis and subject to the benefits of attention-to-color, are not color selective.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

The role of color and attention-to-color in mirror-symmetry perception

Gheorghiu

Kingdom

Remkes

et al. 2016

Sci Rep

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“…The finding that subitizing mechanisms are non-selective to colour and luminance polarity complement a number of previous findings exploring the role of these features in shape processing [81,82], texture-processing [83,84] and in a variety of figure-ground relationships [85][86][87][88][89][90][91][92], which all failed to find evidence for colour-specific and luminance-polarity ('on-off') specific channels mediating the specific dimension of interest (e.g., global shapes/lines, global motion, texture-shape, stereoscopic depth). The finding that subitizing mechanisms do not depend on 'on-off' luminance-polarity, colour or orientation channel interactions has implications for studies investigating groupitizing phenomena which are thought to rely on the recruitment of the subitizing system [55,56,[60][61][62][63].…”

Section: Plos Onesupporting

confidence: 75%

“…Feature-based attention mechanisms have been found to mediate many visual processes [ 94 ]. Several studies have shown that attention-to-colour (and/or luminance polarity) improves performance for symmetry detection [ 95 ], global motion discrimination [ 86 , 90 , 96 ], stereoscopic segmentation [ 91 ] in the absence of colour or luminance-polarity selectivity of these mechanisms (symmetry, motion, disparity). Furthermore, evidence showing decreased performance with increasing number of colours in the stimuli has been also reported for symmetry detection [ 95 , 97 ] with or without attention to colour.…”

Section: Discussionmentioning

confidence: 99%

Spatial and chromatic properties of numerosity estimation in isolation and context

Gheorghiu

Goldschmitt

2022

PLoS ONE

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Numerosity estimation around the subitizing range is facilitated by a shape-template matching process and shape-coding mechanisms are selective to visual features such as colour and luminance contrast polarity. Objects in natural scenes are often embedded within other objects or textured surfaces. Numerosity estimation is improved when objects are grouped into small clusters of the same colour, a phenomenon termed groupitizing, which is thought to leverage on the subitizing system. Here we investigate whether numerosity mechanisms around the subitizing range are selective to colour, luminance contrast polarity and orientation, and how spatial organisation of context and target elements modulates target numerosity estimation. Stimuli consisted of a small number (3-to-6) of target elements presented either in isolation or embedded within context elements. To examine selectivity to colour, luminance polarity and orientation, we compared target-only conditions in which all elements were either the same or different along one of these feature dimensions. We found comparable performance in the same and different feature conditions, revealing that subitizing mechanism do not depend on ‘on-off’ luminance-polarity, colour or orientation channel interactions. We also measured the effect of varying spatial organisation of (i) context, by arranging the elements either in a grid, mirror-symmetric, translation-symmetric or random; (ii) target, by placing the elements either mirror-symmetric, on the vertices of simple shapes or random. Our results indicate higher accuracy and lower RTs in the grid compared to all other context types, with mirror symmetric, translation and random arrangements having comparable effects on target numerosity. We also found improved performance with shape-target followed by symmetric and random target arrangements in the absence and presence of context. These findings indicate that numerosity mechanisms around the subitizing range are not selective to colour, luminance polarity and orientation, and that symmetric, translation and random contexts organisations inhibit target-numerosity encoding stronger than regular/grid context.

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“…The anti-correlations in color contrast degrades stereopsis (34). Kingdom et al (35) concluded that it was unnecessary to pre-filter the image into separate color maps before the image underwent stereopsis processing for the visual system. Reports also tend to agree that visual features are somehow given a "label" based on their chromaticities and that stereoscopic matches with the same label are favored over those without (33,36).…”

Section: Discussionmentioning

confidence: 99%

A novel clinical dynamic stereopsis assessment based on autostereoscopic display system

Wang¹,

Zhong²,

Cheng³

et al. 2022

Ann Transl Med

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Background: Although it is recognized that dynamic stereopsis is vital in daily life, there is still room for improvement in assessment methods. A novel clinical dynamic stereopsis assessment method was created based on an autostereoscopic display system that did not require additional auxiliary glasses. This study evaluated the optical parameters and clinical performance of the autostereoscopic display system for clinical dynamic stereopsis assessment. Methods:The autostereoscopic dynamic stereopsis assessment device was based on a directional backlight technology. Experiment 1 was performed under the same environmental conditions to compare luminance, crosstalk, and spectrum between the autostereoscopic dynamic stereopsis assessment device and the conventional dynamic random-dot stereopsis measuring instrument. Experiment 2 was an observational, analytic, cross-sectional study involving 135 healthy participants, each of whom was asked to complete measurements on both the autostereoscopic and conventional devices in random order. Stereo acuity, operating time, acceptance, and visual fatigue scores were recorded for clinical evaluation. Results:The autostereoscopic device had brighter luminance (139 and 140 cd/m 2 for 2 eyes, respectively), lower crosstalk (4.50% for both eyes), and higher color restoration degree than those of the conventional instrument. Clinically, the novel dynamic stereopsis assessment was as accurate as the traditional method [170" (0.00") and 170" (0.00") respectively; P=0.317], and with more efficiency (166±58.9 and 298±116 s, respectively; P<0.001), higher acceptance (3.36±0.93 and 2.02±0.59 points, respectively; P<0.001), lesser fatigue (0.27±0.46 and 0.73±0.66 points, respectively; P<0.001). The autostereoscopic dynamic stereopsis assessment device with brighter luminance, lower crosstalk, and higher color restoration degree was more effective than the traditional instrument at displaying dynamic clues for clinical dynamic stereopsis assessment. Furthermore, its high-quality image and user-friendly interface provided accurate assessment results in all 3 dynamic stereopsis assessment task conditions, with a higher level of acceptance and lesser visual fatigue, than the traditional assessment method. Conclusions:The autostereoscopic device has excellent functions in both optical parameters and clinical performance, and therefore has the potential to be applied and popularized in future assessments.

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The role of chromatic contrast and luminance polarity in stereoscopic segmentation

Cited by 6 publications

References 12 publications

The role of color and attention-to-color in mirror-symmetry perception

The role of color and attention-to-color in mirror-symmetry perception

Spatial and chromatic properties of numerosity estimation in isolation and context

A novel clinical dynamic stereopsis assessment based on autostereoscopic display system

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