[CogSeminar] Новости: лекция "Geometry and Perception", Qasim Zaidi, 29.05.2018

Рассылка Московского семинара по когнитивной науке seminar на lists.virtualcoglab.org
Ср Май 23 14:02:45 MSD 2018

Уважаемые коллеги,

новости от Марии Фаликман и Тадамасы Савады:

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 на 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.

С уважением,
Екатерина Печенкова.

Видеозаписи Московского семинара по когнитивной науке:

Ekaterina V. Pechenkova <coglab на virtualcoglab.org>

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