Лекция по восприятию цвета и изображений
   
     

29 мая в 18:10 в департаменте психологии ВШЭ (Армянский пер., д. 4, к. 2, ауд. 205) состоится лекция по восприятию цвета и изображений (на английском языке). Заказать пропуск можно до 28.05 включительно у менеджера департамента психологии Натальи Кузнецовой: nskuznetsova@hse.ru.

Анонс лекции:

Qasim Zaidi
(Distinguished Professor, Graduate Center for Vision Research, State University of New York)

Geometry and Perception

Abstract: To illustrate the uses of geometry in understanding visual perception, I will present studies on perception of pictures and colors: (i) We show that in both 3D scene understanding and picture perception, observers mentally apply projective geometry to retinal images. Reliance on the same geometrical function is revealed by the surprisingly close agreement between observers in making judgments of 3D object poses. These judgments are in accordance with that predicted
by a back-projection from retinal orientations to 3D poses, but are distorted by a bias to see poses as closer to fronto-parallel. Reliance on retinal images explains distortions in perceptions of real scenes, and invariance in pictures, including the classical conundrum of why certain image features always point at the observer regardless of viewpoint. These results have implications for investigating 3D scene inferences in biological systems, and designing machine vision systems.
(ii) Geometrical spaces based on similarity judgments are widely used to represent important stimulus qualities in perception, visual cognition and neuroscience. We introduce an approach to measuring relative similarities, which enables us to test the underlying geometry of a perceptual space and its mapping to a physical space of stimuli. For color perception, our results show that perceptual geometry depends on the mental representation used in judging similarity, and it has an affine structure when observers use an opponent-color representation. An affine geometry implies that neural coding of similarity could
involve simple ratios of responses. Our measurements also reveal that the uniform color spaces CIELAB and CIELUV, used extensively in industrial applications, do not provide adequate representation of similarity between moderately spaced colors.

 
         
 
   
 
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