contour interpolation by vector field combination

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Über die Abhängigkeit lokaler Konturintegration von Bottom-up-, Top-down- und globalen Gestaltprozessen

Shape perception in natural scenes relies on integration processes which construct a representation from local image features. An example is contour integration, grouping nearly collinear aligned edge elements into coherent forms. At the same time, perception is strongly modulated by the global form or context of a shape. A prominent example is the better visibility for cardinal as opposed to oblique shapes. Another factor modulating contour integration is attention, indicating the importance of the confluence of bottom-up (sensory input) and top-down signals (task demands) for this task. In the first study reported in this dissertation we use psychophysical studies and EEG recordings to investigate how contour integration is influenced by global factors in form and context of the contour. In a second study we investigate the impact of differing task demands (attention) on contour integration

Faculty Publications and Creative Works 2001

One of the ways in which we recognize our faculty at the University of New Mexico is through Faculty Publications & Creative Works. An annual publication, it highlights our faculty\u27s scholarly and creative activities and achievements and serves as a compendium of UNM faculty efforts during the 2001 calendar year. Faculty Publications & Creative Works strives to illustrate the depth and breadth of research activities performed throughout our University\u27s laboratories, studios and classrooms. We believe that the communication of individual research is a significant method of sharing concepts and thoughts and ultimately inspiring the birth of new ideas. In support of this, UNM faculty during 2001 produced over 2,299* works, including 1,685 scholarly papers and articles, 69 books, 269 book chapters, 184 reviews, 86 creative works and 6 patented works. We are proud of the accomplishments of our faculty which are in part reflected in this book, which illustrates the diversity of intellectual pursuits in support of research and education at the University of New Mexico

Faculty Publications and Creative Works 1999

One of the ways in which we recognize our faculty at the University of New Mexico is through Faculty Publications & Creative Works. An annual publication, it highlights our faculty\u27s scholarly and creative activities and achievements and serves as a compendium of UNM faculty efforts during the 1999 calendar year. Faculty Publications & Creative Works strives to illustrate the depth and breadth of research activities performed throughout our University\u27s laboratories, studios and classrooms. We believe that the communication of individual research is a significant method of sharing concepts and thoughts and ultimately inspiring the birth of new ideas. In support of this, UNM faculty during 1999 produced over 2,292 works, including 1,837 scholarly papers and articles, 78 books, 82 book chapters, 175 reviews, 113 creative works and 7 patented works. We are proud of the accomplishments of our faculty which are in part reflected in this book, which illustrates the diversity of intellectual pursuits in support of research and education at the University of New Mexico

ARTICLE Communicated by David Mumford Orientation, Scale, and Discontinuity as Emergent Properties of Illusory Contour Shape

A recent neural model of illusory contour formation is based on a distribution of natural shapes traced by particles moving with constant speed in directions given by Brownian motions. The input to that model consists of pairs of position and direction constraints, and the output consists of the distribution of contours joining all such pairs. In general, these contours will not be closed, and their distribution will not be scaleinvariant. In this article, we show how to compute a scale-invariant distribution of closed contours given position constraints alone and use this result to explain a well-known illusory contour effect.