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Related Concept Videos

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.
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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...
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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...

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Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
09:46

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

Published on: August 19, 2013

Color constancy for multiple light sources.

Arjan Gijsenij1, Rui Lu, Theo Gevers

  • 1Alten PTS, 2909 LE Capelle a/d IJssel, The Netherlands. arjan.gijsenij@gmail.com

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|August 24, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a patch-based color constancy method to improve accuracy in scenes with multiple light sources. The new approach enhances robustness and reduces errors compared to traditional global methods.

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Area of Science:

  • Computer Vision
  • Image Processing

Background:

  • Color constancy algorithms typically assume uniform lighting, which is often unrealistic.
  • Multiple light sources in a scene violate this simplifying assumption, challenging existing algorithms.

Purpose of the Study:

  • To develop a more robust color constancy methodology for scenes with non-uniform lighting.
  • To extend existing algorithms to handle multiple, simultaneous light sources effectively.

Main Methods:

  • A novel methodology applying color constancy locally to image patches was proposed.
  • Local illuminant estimates were combined for robust estimations, followed by local correction using a modified diagonal model.

Main Results:

  • The proposed patch-based method significantly reduces the influence of two simultaneous light sources.
  • Error reduction reached approximately 30% when the chromatic difference between illuminants exceeded 1°.
  • Performance was comparable to global methods when only one uniform light source was present.

Conclusions:

  • The developed framework offers improved color constancy in complex lighting conditions with multiple light sources.
  • Local, patch-based processing provides a more realistic and accurate approach than global methods for non-uniform scenes.