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A theoretical analysis of how illusory contours are formed in untextured stereograms is presented. This analysis focuses on the role of contour junctions in initiating surface interpolation processes. More specifically, this theory asserts that the matching geometry of stereoscopic junctions-that is, the pattern of matchable and unmatchable features present(More)
An unsolved problem of biology is the processing of global shape in natural vision. The known processes of early vision are spatially restricted (or local) operations, and little is known about their interactions in organizing the visual image into functionally coherent (or global) objects. Here we introduce a human psychophysical method which allows us to(More)
We describe a region-based shape representation that might be particularly useful from a biological perspective because it promotes the localization of objects, and object parts relative to each other. The proposed medial-point representation is similar to medial-axis type representations, but it is more compact. The medial points are those points along the(More)
Random-dot stereo images with controlled spatial and temporal properties clarify problems in stereopsis. Research in stereopsis (1) is traditionally devoted to quantifying the relationship between disparity (2) and perceived depth. Problems of the horopter, perceptual limits of disparity, the metric of the perceived space, and so on, are all examples of(More)
In 1962, Julesz observed that texture pairs with identical second-order statistics but different third- and higher-order statistics were usually not discriminable without scrutiny. Since second-order (dipole) statistics determine the autocorrelation functions and hence the power spectra, this observation also meant that in preattentive perception of texture(More)