• Publications
  • Influence
Detection mechanisms in L-, M-, and S-cone contrast space.
Detection thresholds were obtained for a 2 degrees Gaussian-blurred spot flashed for 200 ms on an 8.9 degrees white adapting field of 1070 trolands. The spot's contrast was represented in an L-, M-,Expand
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The Canny Edge Detector Revisited
  • W. McIlhagga
  • Computer Science
  • International Journal of Computer Vision
  • 1 February 2011
Canny (IEEE Trans. Pattern Anal. Image Proc. 8(6):679-698, 1986) suggested that an optimal edge detector should maximize both signal-to-noise ratio and localization, and he derived mathematicalExpand
  • 98
  • 4
Contour integration in strabismic amblyopia: The sufficiency of an explanation based on positional uncertainty
Contour integration was measured in a group of strabismic amblyopes to determine if an explanation based solely on positional uncertainty was sufficient to explain performance. The task involved theExpand
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Seeing or hearing? Perceptual independence, modality confusions, and crossmodal congruity effects with focused and divided attention
Observers were given brief presentations of pairs of simultaneous stimuli consisting of a visual and a spoken letter. In the visual focused-attention condition, only the visual letter should beExpand
  • 45
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Estimates of edge detection filters in human vision
  • W. McIlhagga
  • Medicine, Psychology
  • Vision Research
  • 10 October 2018
ABSTRACT Edge detection is widely believed to be an important early stage in human visual processing. However, there have been relatively few attempts to map human edge detection filters. In thisExpand
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Noisy templates explain area summation
The noisy template model is a variant of an ideal detector for a signal known except for contrast. The ideal detector cross-correlates the stimulus with a normalised template which is matched to theExpand
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  • 1
Estimation of linear detection mechanisms for stimuli of medium spatial frequency
Detection thresholds were obtained for a circularly-symmetric Gabor profile and Craik-Cornsweet profiles presented on a large white adapting field. These stimuli possessed peak spatial power betweenExpand
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  • 1
Visual pattern matching: Effects of size ratio, complexity, and similarity in simultaneous and successive matching
Abstract An experiment on mental transformation of size, in pairwise comparison of simultaneously or successively presented figures with respect to shape, is reported. Regardless of type ofExpand
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  • 1
Texture segregation with luminance and chromatic contrast
Preattentive texture discrimination was investigated using low spatial frequency texture elements. The contrast between the texture elements and the background was either purely luminance or purelyExpand
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Sinusoid=light bar+dark bar?
A sinusoidal grating can be viewed as a series of light and dark bars. Here we measure the contrast discrimination thresholds for light and dark bars individually, and find that the contrastExpand
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