Cite as:
Tyler C, 2004, "Beyond fourth-order texture discrimination: generation of extreme-order and statistically balanced textures" Perception 33 ECVP Abstract Supplement

Beyond fourth-order texture discrimination: generation of extreme-order and statistically balanced textures

C Tyler

Julesz (1962 IRE Transactions on Information Theory 8 84 - 92) drew attention to the general problem in texture discrimination to account for the inference of texture generation rules in texture samples. A theory of induction of the ensemble generation rule from individual samples of statistically defined textures is developed to account for the concept of discriminability from random textures. New texture paradigms are introduced to avoid contamination by luminance extrema, to control local and long-range texture properties, and to provide patterns without global statistical structure. Local luminance contamination is avoided by novel orientation plaids, in which higher-order rules govern the orientation of local elements rather than their colouring. These textures allow evaluation of texture discrimination up to thirty-second order by cortical pattern elements. Long-range processing is studied by random strip rotation and interlacing of independent textures. Each substantially degrades the visibility of the fourth-order textures, revealing that the fourth-order information is conveyed largely by local rather than long-range perturbations from random statistics. Finally, textures statistically equated at all orders can be defined, but may nevertheless readily be discriminated in human vision. The discrimination on the basis of local perturbations implies that human vision assesses textures through a local sampling window, and is largely insensitive to longer-range statistical properties.

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