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Related Concept Videos

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Skin Cancer

Skin cancer is a type of cancer that occurs when there is an abnormal growth of skin cells, usually triggered by damage to the DNA within the skin cells. It is primarily caused by exposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. Skin cancer is the most common type of cancer worldwide, and its incidence continues to rise.
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Skin Diseases and Disorders

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Related Experiment Video

Updated: Jul 4, 2026

Isolating And Immunostaining Lymphocytes and Dendritic Cells from Murine Peyer's Patches
09:49

Isolating And Immunostaining Lymphocytes and Dendritic Cells from Murine Peyer's Patches

Published on: March 17, 2013

Is color patchy?

Ali Yoonessi1, Frederick A A Kingdom, Samih Alqawlaq

  • 1Department of Ophthalmology, McGill Vision Research Unit, 687 Pine Avenue W. Room H4-14, Montréal, Québec, H3A 1A1, Canada. ali.yoonessi@mcgill.ca

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|June 3, 2008
PubMed
Summary

Chromatic variations in natural scenes are more "patchy" than luminance variations. This finding, related to how the human visual system processes color and light, was unexpected based on Fourier analysis.

Area of Science:

  • Visual perception
  • Image processing
  • Natural scene statistics

Background:

  • Shadows and shading are common in natural scenes and are primarily luminance-defined.
  • Chromatic variations, representing object surfaces, might be expected to have fewer uniform regions than luminance variations.

Purpose of the Study:

  • To investigate the 'patchiness' of chromatic and luminance layers in natural scenes.
  • To compare the patchiness of different color channels (red-green, blue-yellow) with luminance channels.
  • To assess the relationship between image patchiness and Fourier amplitude spectrum slope.

Main Methods:

  • Natural scene images were decomposed into red-green, blue-yellow, and luminance layers.
  • Patchiness was quantified by analyzing bandpass-filtered image pixels across multiple scales.

Related Experiment Videos

Last Updated: Jul 4, 2026

Isolating And Immunostaining Lymphocytes and Dendritic Cells from Murine Peyer's Patches
09:49

Isolating And Immunostaining Lymphocytes and Dendritic Cells from Murine Peyer's Patches

Published on: March 17, 2013

  • The correlation between layer patchiness and the slope of the Fourier amplitude spectrum was calculated.

    • Main Results:

    • Red-green layers exhibited the highest patchiness, followed by blue-yellow layers.
    • Luminance layers were the least patchy.
    • A small, negative correlation was found between patchiness and Fourier spectrum slope for all layers.

    Conclusions:

    • Chromatic layers of natural scenes contain more uniform areas than luminance layers.
    • The observed patchiness patterns are not predicted by the slope of the Fourier amplitude spectrum.
    • This suggests unique statistical properties of chromatic information in natural scenes.