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Natural images contain textural regions such as forests and crowds. They are gatherings of local shapes such as trees and persons, but we do not perceive each of them, but a texture. Texture Discrimination: Data and Theory To understand how the human visual system represents texturual images, we are investigating the discriminability of a variety of texture patterns.
Our recent psychophysical experiments suggest that human visual system has two streams of texture processings. The orientation mechanisms (red) analyze the orientation of local edges (power) while ignoring the color and brightness (phase) of them. The phase mechanisms (green) analyze the color and brightness of eges while ignoring the orientation of them. References Sato, H., Motoyoshi, I. & Sato, T. (in press). Polarity selectivity of spatial interactions in perceived contrast. Journal of Vision. Motoyoshi, I. & Kingdom, F.A.A. (2010). The role of co-circularity of local elements in texture perception. Journal of Vision, 10(1),3,1-8. . [PDF] Motoyoshi, I. & Kingdom, F.A.A. (2007). Differential roles of contrast polarity reveal two streams of second-order visual processing. Vision Research, 47, 2047-2054. Motoyoshi, I. & Nishida, S. (2004). Cross-orientation summation in texture segregation. Vision Research, 44, 2567-2576. Motoyoshi, I. & Nishida, S. (2001). Visual response saturation to orientation contrast in the perception of texture boundary, Journal of the Optical Society of America A, 18, 2209-2219. Motoyoshi, I. & Nishida, S. (2001). Temporal resolution of orientation-based texture segregation, Vision Research, 41, 2089-2105.
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