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Related Concept Videos

Color Vision01:24

Color Vision

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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.
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Thermosensation01:43

Thermosensation

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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

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Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
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Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
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Related Experiment Video

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Quantitative Visualization and Detection of Skin Cancer Using Dynamic Thermal Imaging
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Real-time pseudocolor coding thermal ghost imaging.

Deyang Duan, Yunjie Xia

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |February 25, 2014
    PubMed
    Summary

    This study presents a real-time pseudocolor coding technique to create colorful ghost images from black-and-white objects, enhancing observation and improving interference resistance compared to classical optical imaging.

    Area of Science:

    • Optics
    • Image Processing

    Background:

    • Ghost imaging relies on intensity cross-correlations.
    • Classical optical imaging can be affected by light interference.

    Purpose of the Study:

    • To obtain a color ghost image of a black-and-white object.
    • To enhance the observation of ghost images.
    • To improve the robustness of ghost imaging against light interference.

    Main Methods:

    • Utilized a real-time pseudocolor coding technique.
    • Employed equal spatial frequency pseudocolor coding.
    • Employed equal density pseudocolor coding.

    Main Results:

    • Successfully obtained a color ghost image from a black-and-white object.

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  • The pseudocolor coding enhanced the visibility of the ghost image.
  • Ghost imaging with this technique showed superior performance in overcoming light interference compared to classical optical imaging.

    • Conclusions:

    • Real-time pseudocolor coding is effective for generating observable color ghost images.
    • This technique offers advantages over classical optical imaging in challenging environments with light interference.