Nonlinear analysis of spatial vision using first-and-second-order volterra transfer functions measurement

Logvinenko, Alexander D.

doi:10.1016/0042-6989(90)90019-h

Cited by 15 publications

(1 citation statement)

References 92 publications

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“…In addition to spatial scale (frequency), these test patterns have spatial and temporal windows, and there is no consensus yet on the most appropriate stimulus parameters (Logvinenko, 1990). Each experimenter typically has used a personal choice of bandwidth (number of cycles), ranging from as narrow as 0.18 octave (Banks et al, 1987) through 0.52 octave (Watson, 1982; Davis, 1990) and 1.0 octave (Watson, 1987;Peli et ai., 1990), up to 2.17 octaves (Cannon and Fullenkamp, 1988).…”

Section: Introductionmentioning

confidence: 99%

Contrast sensitivity to patch stimuli: Effects of spatial bandwidth and temporal presentation

Peli¹,

Arend²,

Young³

et al. 1993

Spatial Vis

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Models of the spatial response of human vision are important for applied work, but the available contrast sensitivity function (CSF) data vary widely due to the diverse spatiotemporal stimuli used over the years. To assist selection, this paper: (1) reports measurements of the effects on the CSF of varying the spatial and temporal windows of grating patches; (2) demonstrates that the widely discrepant CSFs from previous studies can be accounted for by using these results; and (3) discusses simple criteria for choosing CSFs for practical applications. CSFs were measured for several combinations of spatial and temporal waveforms, using the same subjects under otherwise identical conditions. The CSF was measured over the range of 0.5-10 c/deg using Gabor-type patches of 1.0-, 0.5-, 0.25-, and 0.125-octave spatial bandwidths using both abrupt and gradual temporal presentations. The results were compared with the CSF obtained with a fixed aperture (4 deg x 4 deg) grating pattern. Increasing the number of cycles resulted in increased sensitivity at intermediate frequencies, changing the CSF to a narrower bandpass shape. For each patch bandwidth, the gradual presentation CSF had a narrower spatial pass band than with the abrupt presentation. The relevance of the large differences in the CSFs obtained with different stimuli to our understanding of visual performance is discussed.

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Section: Introductionmentioning

confidence: 99%

Contrast sensitivity to patch stimuli: Effects of spatial bandwidth and temporal presentation

Peli¹,

Arend²,

Young³

et al. 1993

Spatial Vis

View full text Add to dashboard Cite

show abstract

References

2022

Foundations of Colour Science

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Lack of convexity of threshold curves for compound grating: implications for modelling visual pattern detection

Logvinenko

1993

Biol. Cybern.

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Abstract. Threshold contrasts were determined for complex gratings made from pairs of sine-wave gratings with various spatial frequencies and contrast ratios. It was found that the plots representing the relationship between the contrast of two-component gratings with frequencies fl = 2.0 deg-1 andfz = kfb (1.03 ~< k <~ 3.0), when the compound was at threshold (the so-called contrast threshold curves), tend to have either an elliptical (for k ~< 1.5) or a rectangular (for k = 3) form. Nevertheless, the elliptical fits as the matched-channel model predicted, and the roundedly rectangular fits, as the probability-summation models predicted, were very poor. Furthermore, statistical analysis shows that two of the six contrast threshold curves exhibiting a significant local disturbance fail to be convex.Theoretical treatment in terms of convex analysis shows that such a convexity violation of the contrast threshold curves rules out the possibility of detection being produced by a single linear channel as well as a parallel array of linear channels, either with or without probability summation, provided that the detection principle of the most sensitive channel is adopted. The adaptive matched-channel model originally proposed by Hauske cannot also account for the results obtained; however, it can be modified to be in line with them. We hypothesise that the detection in our experiment is likely to occur by means of several (no more than seven or eight) adaptive partially matched channels.

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Nonlinear analysis of spatial vision using first-and-second-order volterra transfer functions measurement

Cited by 15 publications

References 92 publications

Contrast sensitivity to patch stimuli: Effects of spatial bandwidth and temporal presentation

Contrast sensitivity to patch stimuli: Effects of spatial bandwidth and temporal presentation

References

Lack of convexity of threshold curves for compound grating: implications for modelling visual pattern detection

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