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Related Concept Videos

Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
Perceptual Constancy01:12

Perceptual Constancy

Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
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Inductive Effects on Chemical Shift: Overview

The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
Gestalt Principles of Perception01:21

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Gestalt principles provide a framework for understanding how humans perceive objects as unified wholes within their context. These principles are essential in explaining the cognitive processes that make sense of complex visual stimuli by organizing them into coherent groups. One fundamental principle is proximity, which posits that objects located close to each other are perceived as a collective group. For instance, when dots are positioned near one another, the visual system interprets them...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Vision01:24

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.

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Related Experiment Video

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Visualizing Visual Adaptation
04:43

Visualizing Visual Adaptation

Published on: April 24, 2017

Toward a unified chromatic induction model.

Xavier Otazu1, C Alejandro Parraga, Maria Vanrell

  • 1Computer Vision Center, Computer Science Department, Universitat Autònomade Barcelona, Cerdanyola del Vallès, Barcelona, Spain. xotazu@cvc.uab.es

Journal of Vision
|November 5, 2010
PubMed
Summary
This summary is machine-generated.

A new Chromatic Induction Wavelet Model (CIWaM) unifies chromatic assimilation and contrast effects. This model, based on spatial frequency and surround contrast, accurately predicts color and brightness induction phenomena.

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Area of Science:

  • * Visual perception and color science.
  • * Computational modeling of visual processing.

Background:

  • * Previous work established a brightness induction wavelet model (BIWaM).
  • * Chromatic induction effects, including assimilation and contrast, require a dedicated model.

Purpose of the Study:

  • * To introduce a new Chromatic Induction Wavelet Model (CIWaM) for chromatic induction.
  • * To unify chromatic assimilation and contrast within a single mathematical framework.
  • * To extend the multiresolution wavelet approach to chromatic channels.

Main Methods:

  • * Developed CIWaM based on spatial frequency and surround contrast energy.
  • * Utilized the MacLeod-Boynton (lsY) color space for chromatic channels.
  • * Implemented a multiresolution framework similar to BIWaM.

Main Results:

  • * CIWaM successfully unified both chromatic assimilation and contrast.
  • * Model predictions showed acceptable agreement with psychophysical data from color and brightness induction experiments.

Conclusions:

  • * The CIWaM provides a unified mathematical formulation for chromatic induction.
  • * The model demonstrates the utility of wavelet-based approaches in predicting complex visual phenomena.