scholarly journals The effect of occlusion on amodal completion and surface slant perception

2010 ◽  
Vol 5 (8) ◽  
pp. 576-576
Author(s):  
B. Liu ◽  
C. M. Schor
Keyword(s):  
Amodal Completion ◽  
Slant Perception ◽  
Surface Slant

Slant Perception Under Stereomicroscopy

2017 ◽  
Vol 59 (7) ◽  
pp. 1128-1138 ◽  
Author(s):  
Samantha Horvath ◽  
Kori Macdonald ◽  
John Galeotti ◽  
Roberta L. Klatzky
Keyword(s):  
Optical Coherence Tomography ◽  
Augmented Reality ◽  
Human Perception ◽  
High Accuracy ◽  
Detection Task ◽  
Binocular Viewing ◽  
Optical Coherence ◽  
Slant Perception ◽  
Surface Slant ◽  
Planar Images

Objective These studies used threshold and slant-matching tasks to assess and quantitatively measure human perception of 3-D planar images viewed through a stereomicroscope. The results are intended for use in developing augmented-reality surgical aids. Background Substantial research demonstrates that slant perception is performed with high accuracy from monocular and binocular cues, but less research concerns the effects of magnification. Viewing through a microscope affects the utility of monocular and stereo slant cues, but its impact is as yet unknown. Method Participants performed in a threshold slant-detection task and matched the slant of a tool to a surface. Different stimuli and monocular versus binocular viewing conditions were implemented to isolate stereo cues alone, stereo with perspective cues, accommodation cue only, and cues intrinsic to optical-coherence-tomography images. Results At magnification of 5x, slant thresholds with stimuli providing stereo cues approximated those reported for direct viewing, about 12°. Most participants (75%) who passed a stereoacuity pretest could match a tool to the slant of a surface viewed with stereo at 5x magnification, with mean compressive error of about 20% for optimized surfaces. Slant matching to optical coherence tomography images of the cornea viewed under the microscope was also demonstrated. Conclusion Despite the distortions and cue loss introduced by viewing under the stereomicroscope, most participants were able to detect and interact with slanted surfaces. Application The experiments demonstrated sensitivity to surface slant that supports the development of augmented-reality systems to aid microscope-aided surgery.

The Impact of Radial Distortions in VR Headsets on Perceived Surface Slant

2019 ◽  
Vol 63 (6) ◽  
pp. 60409-1-60409-11 ◽  
Author(s):  
Jonathan Tong ◽  
Robert S. Allison ◽  
Laurie M. Wilcox
Keyword(s):  
Lens Distortion ◽  
Local Surface ◽  
Slant Perception ◽  
Free Surfaces ◽  
Radial Distortion ◽  
Head Mounted Display ◽  
Surface Slant ◽  
Residual Image ◽  
Distortion Parameters ◽  
The Impact

Abstract Modern virtual reality (VR) headsets use lenses that distort the visual field, typically with distortion increasing with eccentricity. While content is pre-warped to counter this radial distortion, residual image distortions remain. Here we examine the extent to which such residual distortion impacts the perception of surface slant. In Experiment 1, we presented slanted surfaces in a head-mounted display and observers estimated the local surface slant at different locations. In Experiments 2 (slant estimation) and 3 (slant discrimination), we presented stimuli on a mirror stereoscope, which allowed us to more precisely control viewing and distortion parameters. Taken together, our results show that radial distortion has significant impact on perceived surface attitude, even following correction. Of the distortion levels we tested, 5% distortion results in significantly underestimated and less precise slant estimates relative to distortion-free surfaces. In contrast, Experiment 3 reveals that a level of 1% distortion is insufficient to produce significant changes in slant perception. Our results highlight the importance of adequately modeling and correcting lens distortion to improve VR user experience.

scholarly journals Early dynamics of stereoscopic surface slant perception

2017 ◽  
Vol 17 (14) ◽  
pp. 4 ◽  
Author(s):  
Baptiste Caziot ◽  
Benjamin T. Backus ◽  
Esther Lin
Keyword(s):  
Slant Perception ◽  
Surface Slant

Slant Perception in Rotated Grid Patterns

1968 ◽  
Author(s):  
Myron L. Braunstein ◽  
John W. Payne
Keyword(s):  
Slant Perception

Infusing Perception with Imagination

2018 ◽  
Author(s):  
Derek H. Brown
Keyword(s):  
Case Studies ◽  
Amodal Completion ◽  
Perceptual Constancy

This chapter explores the broad thesis that most if not all perceptual experiences are infused or soaked with imaginings. To begin, the author articulates a sense of imagination useful for this discussion, avoids some pitfalls, and incorporates the result into a schematic guidance principle. The thought behind the principle is that imaginative contributions to perceptual experiences are self-generated ingredients to perception that have a reasonably direct, ampliative impact on the relevant perceptual experiences. This framework is then applied to three sets of case studies: object-kind and object-sameness experiences (Strawson 1970); colour (Macpherson 2012); and amodal completion (Nanay 2010) and perceptual constancy. Although the case studies have interesting differences, they all conform to the guidance principle. Since each has the potential to independently justify the thesis that perceptual experiences are infused with imaginings, they collectively provide sound motive to provisionally endorse it.

scholarly journals Measurements of the effect of surface slant on perceived lightness

10.1167/4.9.7 ◽  
2004 ◽  
Vol 4 (9) ◽  
pp. 7 ◽  
Author(s):  
Caterina Ripamonti ◽  
Marina Bloj ◽  
Robin Hauck ◽  
Kiran Mitha ◽  
Scott Greenwald ◽  
...  
Keyword(s):  
Surface Slant ◽  
Effect Of Surface
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