A new slant on orientation disparity: Evaluating orientation disparity as a cue for 3D surface slant perception

H. S. Greenwald; D. C. Knill

doi:10.1167/6.6.829

A new slant on orientation disparity: Evaluating orientation disparity as a cue for 3D surface slant perception

Journal of Vision ◽

10.1167/6.6.829 ◽

2010 ◽

Vol 6 (6) ◽

pp. 829-829

Author(s):

H. S. Greenwald ◽

D. C. Knill

Keyword(s):

Slant Perception ◽

3D Surface ◽

Surface Slant ◽

Orientation Disparity

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Adaptation to the induced effect stimulus normalizes surface slant perception and recalibrates eye position signals for azimuth

Journal of Vision ◽

10.1167/5.10.5 ◽

2005 ◽

Vol 5 (10) ◽

pp. 5 ◽

Cited By ~ 1

Author(s):

Baoxia Liu ◽

Ellen M. Berends ◽

Clifton M. Schor

Keyword(s):

Eye Position ◽

Slant Perception ◽

Surface Slant

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Slant Perception Under Stereomicroscopy

Human Factors The Journal of the Human Factors and Ergonomics Society ◽

10.1177/0018720817722871 ◽

2017 ◽

Vol 59 (7) ◽

pp. 1128-1138 ◽

Cited By ~ 1

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.

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

Journal of Imaging Science and Technology ◽

10.2352/j.imagingsci.technol.2019.63.6.060409 ◽

2019 ◽

Vol 63 (6) ◽

pp. 60409-1-60409-11 ◽

Cited By ~ 1

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.

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