منابع مشابه
24 Lightness Perception and Lightness Illusions EDWARD
The amount of light coming to the eye from an object depends on the amount of light striking the surface, and on the proportion of light that is reflected. If a visual system only made a single measurement of luminance, acting as a pho-tometer, then there would be no way to distinguish a white surface in dim light from a black surface in bright light. Yet humans can usually do so, and this skil...
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Human 3D motion tracking from video is an emerging research field with many applications demanding highly detailed results. This chapter surveys a high quality generative method, which employs the person’s silhouette extracted from one or multiple camera views for fitting an a-priori given 3D body surface model. A coupling between pose estimation and contour extraction allows for reliable track...
متن کاملCapturing the semiotic relationship between terms
Tags describing objects on the web are often treated as facts about a resource, whereas it is quite possible that they represent more subjective observations. Existing methods of term expansion expand terms based on dictionary definitions or statistical information on term occurrence. Here we propose the use of a thematic model for term expansion based on semiotic relationships between terms, t...
متن کاملLightness, brightness, and anchoring.
The majority of work in lightness perception has evaluated the perception of lightness using flat, matte, two-dimensional surfaces. In such contexts, the amount of light reaching the eye contains a conflated mixture of the illuminant and surface lightness. A fundamental puzzle of lightness perception is understanding how it is possible to experience achromatic surfaces as specific achromatic sh...
متن کاملParadoxical lightness contrast
The visual system's computation of lightness (perceived reflectance) leads to contrast effects in which a gray target region appears lighter on a black background than on a white one. Here we show a paradoxical contrast effect in which targets look lighter after adding regions that increase the scene's average luminance, and darker after adding regions that decrease this luminance. The paradoxi...
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ژورنال
عنوان ژورنال: Perception
سال: 2010
ISSN: 0301-0066,1468-4233
DOI: 10.1068/p6539