• Corpus ID: 16580204

THE APPLIED VISION ASSOCIATION IS A REGISTERED CHARITY NO: 1049146 COMMITTEE OF MANAGEMENT Chairman: Vice chair: Treasurer: Bulletin of the AVA: Publicity Officer:

  title={THE APPLIED VISION ASSOCIATION IS A REGISTERED CHARITY NO: 1049146 COMMITTEE OF MANAGEMENT Chairman: Vice chair: Treasurer: Bulletin of the AVA: Publicity Officer:},
  author={Ian R. Moorhead},
presented at ECVP Motion contrast: a new metric for direction discrimination N.E. Scott-Samuel* and M.A Georgeson School of Psychology, University of Birmingham, Birmingham, B15 2TT, U.K. (*current address: Department of Psychology, Royal Holloway, Egham, TW20 OEX, U.K.) Email: n.scott-samuel@rhbnc.ac.uk, m.a.georgeson@bham.ac.uk The Adelson-Bergen energy model (1985 Journal of the Optical Society of America A 2 284-299) is a standard framework for understanding 1storder motion processing. Its… 


Perception of stationary plaids: The role of spatial filters in edge analysis
Adding a low contrast third harmonic to one component in square-wave phase changed the plaid's appearance from squares to diamonds, but adapting to the third harmonic enhanced the square appearance.
Band-limited contrast in natural images explains the detectability of changes in the amplitude spectra
A band-limited contrast model is described that reveals that contrast changes in only one frequency band are of comparable magnitudes to the changes that observers need for detecting differences in the Michelson contrast of simple sinusoidal gratings.
In search of a contrast metric: Matching the perceived contrast of gabor patches at different phases and bandwidths
  • E. Peli
  • Mathematics, Medicine
    Vision Research
  • 1997
The results suggest that a computational contrast metric based on multi-scale bandpass filtering is a better estimate of apparent perceived contrast than any of the other metrics tested.
The computation of orientation statistics from visual texture
This paper examines how observers estimate the overall orientation of spatially disorganised textures containing variable orientation and indicates that average orientation is assigned to the centroid of a set of orientation measures.
Grating detection and orientation discrimination in amblyopia.
The results suggest that non veridical visual perception in central amblyopic vision can not be revealed under natural viewing conditions by comparing the ability to detect the presence of a grating with the abilityto identify its orientation.
The vision of natural and complex images
  • A. Pelah
  • Psychology, Medicine
    Vision Research
  • 1997
This issue, Tolhurst and Tadmor, and Peli, provide new evidence that a suitable expression for the discrimination and appearance of contrast in complex images requires a multi-channel bandpass or multi-scale description, and claim that narrow band receptors can actually outperform more broadly tuned ones in improving colour constancy.
Orientation tuning of the spatial-frequency-tuned mechanisms of the red-green channel.
  • R. L. Pandey Vimal
  • Medicine
    Journal of the Optical Society of America. A, Optics, image science, and vision
  • 1997
Data suggest that the orientation tuning curves of the SF-tuned chromatic mechanisms are broader than those of the achromatic mechanisms (orientation half-bandwidths: 32 degrees-15 degrees for 0.5-11 cpd); moreover, the orientation bandwidths are SF dependent.
Sequential stereopsis using high-pass spatial frequency filtered textures
The results corroborate Enright's general conclusions on sequential stereopsis, while at the same time showing that high-pass textures do not give wholly similar results to sandpaper.
Holding an object one is looking at: Kinesthetic information on the object’s distance does not improve visual judgments of its size
Whether kinesthetic information about an object’s distance—based on the posture of the arm and hand when holding it—influences the object”s perceived size is examined.
Visual sensitivity, blur and the sources of variability in the amplitude spectra of natural scenes
The slope of the RCS was found to provide a reasonable prediction of physical blur across a variety of scenes in spite of the variability in their amplitude spectra, and was also found to produce a good prediction of perceived blur as judged by human subjects.