A model for global symmetry detection in dense images

Labonte, F.; Shapira, Yeruham; Cohen, Paul R.; Faubert, Jocelyn

doi:10.1163/156856895x00106

Cited by 38 publications

(4 citation statements)

References 32 publications

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“…This will play a role especially when patterns are flashed briefly. Recent experimental research has already demonstrated the role of clustering in symmetry detection (e.g., Dakin & Wart, 1994;Labonte, Shapira, Cohen, & Faubert, 1995;Locher & Wagernans, 1993;Wenderoth, 1995). In sum.…”

Section: Discussionmentioning

confidence: 97%

Toward a better approach to goodness: Comments on Van der Helm and Leeuwenberg (1996).

Wagemans

1999

Psychological Review

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Some resularities are more salient to the visual system than others. P. A. van der Helm and E. L. J. Leeuwenberg (1996) have proposed a new approach that quantifies the goodness of a pattern's regularity as the number of holographic identities constituting the regulartiy, relative to the total amount of information needed to describe the pattern. This holographic approach to goodness was compared with previous approaches and was presented in relation to metatheoretical issues. Tnese 3 aspects are discussed further here. First, the theory is shown to contain implausible assumptions and unfortunate gaps with respect to the required processing. Second, Van der Helm and Lseuwenberg's critique on preceding theories is refuted. Third, some metatheorerical issues need to be qualified or at least clarified. Together, these concerns suggest that a better approach to goodness might result from a synthesis of the most useful aspects of diverse theories of goodness. I would like to acknowledge the useful discussions with Rob Van Lier, who acted as the perfect sounding board for my view on structural information theory. I am also grateful to Julian Hochberg, Stephen Palmer, and Peter van der Helm, and two anonymous reviewers for their comments on a draft. This article was written with support from Grants G.

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Section: Discussionmentioning

confidence: 97%

Toward a better approach to goodness: Comments on Van der Helm and Leeuwenberg (1996).

Wagemans

1999

Psychological Review

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“…The long-standing debate on how many mechanisms underlie the detection of mirror symmetry (e.g., [7,19,20,75,79,[88][89][90]) might also be revived by the addition of new hypotheses regarding cross-modal or modal-specific processes. The issue of the existence of independent or related processing paths underlying the perception of visual and acoustic symmetry is well worth investigating as is the question of whether there are independent or related processing paths underlying the perception of symmetry in dynamic and static visual configurations.…”

Section: Discussionmentioning

confidence: 99%

Matching Visual and Acoustic Mirror Forms

Bianchi

Burro

Pezzola³

et al. 2017

Symmetry

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This paper presents a comparative analysis of the ability to recognize three mirror forms in visual and acoustic tasks: inversion (reflection on a horizontal axis), retrograde (reflection on a vertical axis) and retrograde inversion (reflection on both horizontal and vertical axes). Dynamic patterns consisting of five tones in succession in the acoustic condition and five square dots in succession in the visual condition were presented to 180 non-musically expert participants. In a yes/no task, they were asked to ascertain whether a comparison stimulus represented the "target" transformation (i.e., inversion, retrograde or retrograde inversion). Three main results emerged. Firstly, the fact that symmetry pertaining to a vertical axis is the most easily perceived does not only apply to static visual configurations (as found in previous literature) but also applies to dynamic visual configurations and acoustic stimuli where it is in fact even more marked. Secondly, however, differences emerged between the facility with which the three mirror forms were recognized in the acoustic and visual tasks. Thirdly, when the five elements in the stimulus were not of the same duration and therefore a rhythmic structure emerged, performance improved not only in the acoustic but also (even more significantly) in the visual task.

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“…Models for detecting and localising mirror-symmetry can be divided into three main categories: pixel-by-pixel correlations between the symmetric halves [36,41,42], models based on complex grouping rules (based on higher-order structural correlation) from which symmetry is subsequently extracted [5,43,44], and models based on early spatial mechanisms (e.g., oriented spatial filters) from which symmetrical elements are detected by the outputs of oriented receptive fields of various sizes [34,37,45]. Although it is well established that receptive fields of cortical neurons are spatio-temporally oriented (i.e., they tilt along an oblique axis in the space-time domain and are space-time inseparable [46]), none of the existing models incorporate the dynamic/temporal aspects of the stimuli.…”

Section: Relevance To Models Of Symmetry Perceptionmentioning

confidence: 99%

Spatiotemporal and Luminance Contrast Properties of Symmetry Perception

Sharman

Gheorghiu

2018

Symmetry

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Recent studies have shown that limiting the lifetime of pattern elements improves symmetry detection, potentially by increasing the number of element locations. Here, we investigate how spatial relocation, luminance contrast modulation and lifetime duration of elements affect symmetry perception in dynamic stimuli. Stimuli were dynamic dot-patterns containing varying amounts of symmetry about a vertical axis. Symmetrical matched-pairs were: (i) relocated to multiple successive, but random locations (i.e., multiple locations condition); (ii) relocated between the same two locations (i.e., two locations condition); (iii) not, relocated, but their luminance contrast was modulated at different temporal frequencies (i.e., one location condition), and (iv) not relocated, but a single pattern was presented at full contrast (i.e., static condition). In the dynamic conditions, we varied the elements' lifetime duration and temporal frequency of contrast modulation. We measured symmetry detection thresholds using a two-interval forced choice procedure. Our results show improved performance for the multiple locations condition compared to two-location and static conditions, suggesting a cumulative process whereby weak symmetry information is integrated by spatiotemporal filters to increase overall symmetry signal strength. Performance also improved for the static, contrast modulated patterns, but this was explained by a reduction in perceived density. This suggests that different mechanisms mediate symmetry detection in dynamic stimuli and static contrast modulated patterns.

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A model for global symmetry detection in dense images

Cited by 38 publications

References 32 publications

Toward a better approach to goodness: Comments on Van der Helm and Leeuwenberg (1996).

Toward a better approach to goodness: Comments on Van der Helm and Leeuwenberg (1996).

Matching Visual and Acoustic Mirror Forms

Spatiotemporal and Luminance Contrast Properties of Symmetry Perception

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