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Related Concept Videos

Light Acquisition02:16

Light Acquisition

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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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The Wave Nature of Light02:12

The Wave Nature of Light

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The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
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Light as Energy01:35

Light as Energy

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The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
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Electric Field01:16

Electric Field

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Consider two point charges, each exerting Coulomb force on the other. It is possible to describe the Coulomb interaction via an intermediate step by defining a new physical quantity called the electric field.
In the new picture, imagine that the first charge sets up an electric field independent of all other charges in the universe. When another charge comes in its vicinity, the second charge experiences an electric force depending on the electric field at that point. The source charge does not...
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Magnetic Fields01:27

Magnetic Fields

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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Electromagnetic Fields01:30

Electromagnetic Fields

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Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
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Determining 3D Flow Fields via Multi-camera Light Field Imaging
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Light Fields for Face Analysis.

Chiara Galdi1, Valeria Chiesa2, Christoph Busch3,4

  • 1Department of Digital Security, EURECOM, 06560 Sophia Antipolis, France. galdi@eurecom.fr.

Sensors (Basel, Switzerland)
|June 19, 2019
PubMed
Summary
This summary is machine-generated.

Light fields capture full scene information, enabling advanced face analysis. This review covers recent progress in face recognition, detection, and landmark identification using light-field imaging.

Keywords:
face analysislight fieldsurvey

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Area of Science:

  • Computer Vision
  • Image Processing
  • Biometrics

Background:

  • The plenoptic function describes light intensity from all positions and directions.
  • Emerging light-field cameras capture richer scene data than traditional imaging.
  • Existing image processing methods require adaptation for light-field data.

Purpose of the Study:

  • To review the state-of-the-art in applying light-field technology to face analysis.
  • To identify current research trends and future directions in this nascent field.
  • To explore potential applications of light fields in biometric systems.

Main Methods:

  • Literature review of recent works on light fields for face analysis.
  • Categorization of research based on face analysis tasks (recognition, anti-spoofing, soft-biometrics, landmark detection).
  • Analysis of methodologies and reported results in the reviewed studies.

Main Results:

  • Light-field analysis shows promising results across various face analysis tasks.
  • Face recognition and presentation attack detection benefit significantly from richer light-field data.
  • Facial landmark detection accuracy is enhanced by the directional information in light fields.

Conclusions:

  • Light-field imaging offers a powerful new paradigm for face analysis.
  • Further research is needed to fully exploit the potential of light fields.
  • Future applications include more robust and secure biometric systems.