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Related Concept Videos

Vision01:24

Vision

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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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Range00:59

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The range is one of the measures of variation. It can be defined as the difference between a dataset's highest and lowest values. For example, in the study of seven 16-ounce soda cans, the filled volume of soda was measured, thus producing the following amount (in ounces) of soda:
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Assessment of the Cardiovascular System II: Inspection01:29

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Inspection is the initial step in assessing the cardiovascular system. It involves a detailed visual examination that provides crucial information about a patient's circulatory and cardiac health. This systematic process, conducted from head to toe, helps identify signs of cardiovascular conditions by observing physical appearance, skin and mucous membranes, jugular and carotid pulsations, chest symmetry, and the condition of the extremities.
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Color Vision01:24

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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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Assessment of the Abdomen I: Inspection and Auscultation01:25

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Lumber Defects01:23

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Lumber defects, which can affect both the appearance and structural integrity of wood, include a variety of growth and manufacturing flaws. Growth defects such as knots and knotholes occur where branches were once attached to the tree trunk, with knotholes forming when these knots fall out. Other natural defects include decay and insect damage, which compromise the wood's strength and durability.
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Vision system with high dynamic range for optical surface defect inspection.

Zhaolou Cao, Fenping Cui, Chunjie Zhai

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    |January 16, 2019
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    A new machine vision system offers high dynamic range for efficient optical surface defect inspection. This automated system uses unique channel gains and image stitching for precise quality evaluation.

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    Area of Science:

    • Optical Engineering
    • Machine Vision
    • Metrology

    Background:

    • Optical surface quality is critical in manufacturing.
    • Traditional inspection methods can be inefficient or costly.
    • Automated defect detection requires high dynamic range imaging.

    Purpose of the Study:

    • To develop a high dynamic range machine vision system for optical surface defect inspection.
    • To improve inspection efficiency and accuracy.
    • To provide a low-cost solution for the optical industry.

    Main Methods:

    • Utilized a system with motorized linear and rotation stages for automated scanning.
    • Implemented differential red, green, and blue channel gains to extend dynamic range in a single snapshot.
    • Employed image stitching for high-resolution surface imaging.
    • Applied quantitative evaluation based on MIL-PRF-13830B and ISO 10110-7:2008 standards.

    Main Results:

    • Achieved high dynamic range imaging for optical surface inspection.
    • Demonstrated improved efficiency compared to multi-exposure techniques.
    • Enabled quantitative surface quality evaluation.
    • Successfully integrated automated scanning and image processing.

    Conclusions:

    • The developed machine vision system provides an efficient and low-cost solution for optical surface defect inspection.
    • The system's high dynamic range capability enhances defect detection accuracy.
    • This technology is applicable for widespread use in the optical industry.