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Artículos Encontrados 5 registros  
1.
14 p, 397.6 KB Spatiochromatic properties of natural images and human vision / Parraga, Carlos Alejandro (University of Bristol. Department of Experimental Psychology) ; Troscianko, Tom (University of Sussex) ; Tolhurst, D.J. (University of Cambridge. Department of Physiology)
The human visual system shows a relatively greater response to low spatial frequencies of chromatic spatial modulation than to luminance spatial modulation [1]. However, previous work [2, 3] has shown that this differential sensitivity to low spatial frequencies is not reflected in any differential luminance and chromatic content of general natural scenes. [...]
2002 - 10.1016/S0960-9822(02)00718-2
Current Biology, Vol. 12, Issue 6 (March 2002) , p. 483-487  
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2.
37 p, 727.4 KB The effect of contrast randomisation on the discrimination of changes in the slopes of the amplitude spectra of natural scenes / Parraga, Carlos Alejandro (University of Cambridge. Department of Physiology) ; Tolhurst, David J. (University of Cambridge. Department of Physiology)
It has been suggested (Tadmor and Tolhurst, 1994 Vision Research34 541-554) that the psychophysical task of discriminating changes in the slope of the amplitude spectrum of a complex image may be similar to detecting differences in the degree of blur. [...]
2000 - 10.1068/p2904
Perception, Vol. 29, Issue 9 (September 2000) , p. 1101-1116  
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3.
14 p, 619.0 KB The human visual system is optimised for processing the spatial information in natural visual images / Parraga, Carlos Alejandro (University of Bristol. Department of Experimental Psychology) ; Troscianko, Tom (University of Bristol. Department of Experimental Psychology) ; Tolhurst, D. J. (University of Cambridge. Department of Physiology)
A fundamental tenet of visual science is that the detailed properties of visual systems are not capricious accidents, but are closely matched by evolution and neonatal experience to the environments and lifestyles in which those visual systems must work [1, 2, 3, 4, 5]. [...]
2000 - 10.1016/S0960-9822(99)00262-6
Current Biology, Vol. 10, Issue 1 (January 2000) , p. 35-38  
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4.
52 p, 1.0 MB The effects of amplitude-spectrum statistics on foveal and peripheral discrimination of changes in natural images, and a multi-resolution model / Parraga, Carlos Alejandro (University of Bristol. Department of Experimental Psychology) ; Troscianko, Tom (University of Bristol. Department of Experimental Psychology) ; Tolhurst, D.J. (University of Cambridge. Department of Physiology)
Psychophysical thresholds were measured for discriminating small changes in spatial features of naturalistic scenes (morph sequences), for foveal and peripheral vision, and under M-scaling. Sensitivity was greatest for scenes with near natural Fourier amplitude slope, perhaps implying that human vision is optimised for natural scene statistics. [...]
2005 - 10.1016/j.visres.2005.08.006
Vision Research, Vol. 45, Issue 25-26 (November 2005) , p. 3145-3168  
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5.
13 p, 829.4 KB Stability of the color-opponent signals under changes of illuminant in natural scenes / Lovell, P. G. (University of Bristol. Department of Experimental Psychology) ; Tolhurst, D. J. (University of Cambridge. Department of Physiology) ; Parraga, Carlos Alejandro (University of Bristol. Department of Experimental Psychology) ; Baddeley, R. (University of Bristol. Department of Experimental Psychology) ; Leonards, U. (University of Bristol. Department of Experimental Psychology) ; Troscianko, J. (University of Oxford. Department of Zoology) ; Troscianko, Tom (University of Bristol. Department of Experimental Psychology)
Illumination varies greatly both across parts of a natural scene and as a function of time, whereas the spectral reflectance function of surfaces remains more stable and is of much greater relevance when searching for specific targets. [...]
2005 - 10.1364/JOSAA.22.002060
Journal of the Optical Society of America. Optics, image science, and vision, Vol. 22, Issue 10 (October 2005) , p. 2060-2071  
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2 Tolhurst, D. J.
1 Tolhurst, David J.
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