2018-02-12 Perceptual organization PSY 525.001 Vision Science 2018 - - PowerPoint PPT Presentation

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2018-02-12 Perceptual organization PSY 525.001 Vision Science 2018 - - PowerPoint PPT Presentation

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2018-02-12 Perceptual organization PSY 525.001 Vision Science 2018 Spring Rick Gilmore 2018-02-12 12:05:51 1 / 44 Today's topics 2 / 44 Today's topics Perceptual organization 2 / 44 Today's topics Perceptual organization Discuss

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2018-02-12 Perceptual organization

PSY 525.001 • Vision Science • 2018 Spring

Rick Gilmore 2018-02-12 12:05:51

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Today's topics

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Today's topics

Perceptual organization

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Today's topics

Perceptual organization Discuss Biederman (1987).

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Perceptual grouping

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Perceptual grouping

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Element connectedness

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Common region

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Johansson: Motion Perception part 1

Motion and perceptual organization

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Early or late?

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Scene perception

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Analyzing regions/camoage

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Uniform connectedness: region parsing before grouping? (Palmer & Rock)

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Edge detection through spatial frequency ltering

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Illusory edges and spreading

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Texture segregation

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Ben-Shahar, O. (2006). Visual saliency and texture segregation without feature

  • gradient. Proceedings of the National Academy of Sciences of the United States
  • f America, 103(42), 15704–15709. Retrieved from

http://dx.doi.org/10.1073/pnas.0604410103 17 / 44

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Figure/ground segregation

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Figure Ground Thinglike Not thinglike Closer to observer Farther from observer Bounded by contour Extends behind contour Shape defined by contour No shape at contour Palmer Table 6.3.1 19 / 44

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Symmetry, convexity, smallness, bottom-up polarity, lower region, protrusion

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"Figure–ground segregation can be computed without relying on image contours. Figural status estimates result from a multidirectional linear voting process." Dimiccoli, M. (2016). Figure-ground segregation: A fully nonlocal approach. Vision Research, 126, 308–317. Retrieved from http://dx.doi.org/10.1016/j.visres.2015.03.007 21 / 44

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Amodal completion (perception of occluded whole) vs. modal completion (perception of unoccluded whole) 22 / 44

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Ringach, D. L., & Shapley, R. (1996). Spatial and temporal properties of illusory contours and amodal boundary completion. Vision Research, 36(19), 3037–

  • 3050. Retrieved from https://www.ncbi.nlm.nih.gov/pubmed/8917767

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Multi-stable images

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Pitts, M. A., Nerger, J. L., & Davis, T. J. R. (2007). Electrophysiological correlates

  • f perceptual reversals for three different types of multistable images. Journal
  • f Vision, 7(1), 6. Retrieved from http://dx.doi.org/10.1167/7.1.6

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Necker cube with illusory contours 27 / 44

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ambiguous and unambiguous plaid motion stimuli - Psychophysi…

Ambiguous/multi-stable vs. unambiguous plaids

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Are there deeper relationships at work here?

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Geisler, W. S., & Perry, J. S. (2009). Contour statistics in natural images: Grouping across occlusions. Visual neuroscience, 26(1), 109–121. Cambridge University Press. 32 / 44

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Geisler, W. S., & Perry, J. S. (2009). Contour statistics in natural images: Grouping across occlusions. Visual neuroscience, 26(1), 109–121. Cambridge University Press. 33 / 44

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Geisler, W. S., & Perry, J. S. (2009). Contour statistics in natural images: Grouping across occlusions. Visual neuroscience, 26(1), 109–121. Cambridge University Press. 34 / 44

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Break time

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Discussion of Biederman (1987)

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Principles of "non-accidentalness"

  • 1. Collinearity
  • 2. Curvilinearity
  • 3. Symmetry
  • 4. Parallel curves
  • 5. Vertices

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Brain Games Yellow Chair National Geographic Channel Watch o…

Ames chair illusion illustrates implicit "principle" of co-termination

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Edge Symmetry Size Axis Straight or Curved Rot + Ref; Ref; Asymm Constant; Expanded; Expand & Contract Straight or Curved 42 / 44

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Next time...

Size, shape, orientation, & position

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Slides created via the R package xaringan. Rendered HTML and supporting files are pushed to GitHub where GitHub's 'pages' feature is used to host and serve the course website. 44 / 44