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Related Concept Videos

Visual System01:26

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
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.
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
Vision01:24

Vision

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.
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...
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...

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Large Volume, Behaviorally-relevant Illumination for Optogenetics in Non-human Primates
08:32

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Published on: October 3, 2017

Lighting System for Visual Perception Enhancement in Volume Rendering.

Lei Wang, Arie E Kaufman

    IEEE Transactions on Visualization and Computer Graphics
    |March 21, 2012
    PubMed
    Summary
    This summary is machine-generated.

    We developed a new lighting system to improve 3D object perception using key, fill, and detail lights. This system optimizes visual cues for shape and depth, achieving realistic and smooth animations at interactive speeds.

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    Area of Science:

    • Computer Graphics
    • Human-Computer Interaction
    • Perception Science

    Background:

    • Accurate perception of 3D volumetric objects in computer graphics relies heavily on effective visual cues.
    • Existing lighting systems often struggle to balance global and local illumination effects for optimal depth and shape perception.

    Purpose of the Study:

    • To introduce a novel lighting system designed to enhance the perception of 3D volumetric objects in rendered images.
    • To develop a perception measurement and lighting design algorithm for optimizing visual cues.

    Main Methods:

    • Dividing lighting effects into global and local components, utilizing key, fill, and detail directional lights.
    • Employing gradient, shadows, and translucent objects to convey cues for local shape, global shape, and depth.
    • Quantifying perception and using exhaustive search for light parameter optimization, ensuring preservation of global impression and smooth animation.

    Main Results:

    • The key light effectively conveys cues for local and global shapes and depth.
    • Fill lights enhance perceptibility, while detail lights refine local shape cues.
    • A simplified version achieves interactive frame rates with visually indistinguishable results from the non-simplified algorithm.

    Conclusions:

    • The proposed lighting system significantly enhances 3D volumetric object perception.
    • The developed algorithm provides an effective method for designing lighting that optimizes visual cues for shape and depth.
    • The simplification ensures practical application with interactive performance without compromising visual fidelity.