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Related Concept Videos

Color Vision01:24

Color Vision

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.
Photoreceptors and Visual Pathways01:22

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...
Potentiometer01:30

Potentiometer

Voltage and current measurements using a standard voltmeter and ammeter alter the circuit being measured either by drawing or resisting the current flow, which introduces uncertainties in the measurements. Null measurements balance the voltages so that no current flows through the measuring device and, therefore, no alterations occur in the measured circuit.
Suppose the emf of a battery needs to be measured. If the battery is directly connected to a standard voltmeter, the measured quantity is...
Light Acquisition02:16

Light Acquisition

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.
Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
Channel Rhodopsins01:11

Channel Rhodopsins

Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...

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Light Spot-Based Assay for Analysis of Drosophila Larval Phototaxis
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White-light pseudocolor density encoder.

A Tai, F T Yu, H Chen

    Optics Letters
    |August 18, 2009
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a white-light processing technique for pseudocolor encoding photographic materials. The method uses spatial filtering to create diverse color codes while eliminating artifacts common in coherent systems.

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    Area of Science:

    • Optics
    • Image Processing
    • Materials Science

    Background:

    • Pseudocolor encoding enhances image information by assigning colors to grayscale values.
    • Traditional coherent optical systems for pseudocoloring often suffer from artifact noise.
    • Developing artifact-free pseudocoloring techniques is crucial for accurate image analysis.

    Purpose of the Study:

    • To present a simple white-light processing technique for pseudocolor encoding based on photographic material density.
    • To demonstrate the generation of various color codes using spatial filtering of diffracted light.
    • To highlight the advantages of white-light systems over coherent systems in pseudocoloring applications.

    Main Methods:

    • Utilized a white-light processing system for optical pseudocoloring.
    • Employed selective spatial filtering of dispersed colors from high-diffraction orders of a halftone input.
    • Analyzed the density of photographic materials for color assignment.

    Main Results:

    • Achieved pseudocolored output with a wide variety of color codes.
    • Successfully eliminated coherent artifact noises typically found in coherent pseudocoloring systems.
    • Experimental results validated the effectiveness and versatility of the white-light technique.

    Conclusions:

    • The presented white-light processing technique offers a simple and effective method for pseudocolor encoding.
    • This approach provides flexibility in color code generation and superior image quality by avoiding artifacts.
    • The white-light system is a viable and advantageous alternative to coherent systems for pseudocoloring photographic materials.