Spatial Vision , Vol. 16, No. 5, pp. 459– 478 (2003) Ó VSP 2003. Also available online - www.vsppub.com Strength of feature contrast mediates interaction among feature domains GÜNTER MEINHARDT ¤ and MALTE PERSIKE Westf. Wilhelms Universität, FB07, Fliednerstrasse 21, D-48149 Münster, Germany Received 1 April 2003; revised 26 July 2003; accepted 8 August 2003 Abstract —Traditional theories of texture segregation suggest that elementary visual features are processed in parallel by independent modules at early visual stages. Here we show that, for small feature contrasts and large values evoking perceptual popout, different forms of module interaction exist. While discrimination of highly salient features rests on independent feature speci c pathways, information is summed across domains when barely noticeable ones are to be detected in homogeneous textures. Keywords : Feature contrast; feature synergy; nonlinear summation; Weber fraction. 1. INTRODUCTION When we search a visual scenery we are guided by locations of feature dissimilarity which help to separate objects from their surround. Feature contrast, de ned as the difference of object and surround within a basic visual feature such as color, form, orientation or direction of motion, is a major determinant of saliency. Objects with high contrast in at least
Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill
Published: Jan 1, 2003
Keywords: Weber fraction.; nonlinear summation; feature synergy; Feature contrast
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