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相关概念视频

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

438
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
438
Curvilinear Motion: Polar Coordinates01:27

Curvilinear Motion: Polar Coordinates

391
In polar coordinates, the motion of a particle follows a curvilinear path. The radial coordinate symbolized as 'r,' extends outward from a fixed origin to the particle, while the angular coordinate, 'θ,' measured in radians, represents the counterclockwise angle between a fixed reference line and the radial line connecting the origin to the particle.
The particle's location is described using a unit vector along the radial direction. Deriving the particle's position...
391
Group Polarization01:01

Group Polarization

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Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
34.3K
Flame Photometry: Overview01:02

Flame Photometry: Overview

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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
667
Polar and Cylindrical Coordinates01:22

Polar and Cylindrical Coordinates

14.7K
The Cartesian coordinate system is a very convenient tool to use when describing the displacements and velocities of objects and the forces acting on them. However, it becomes cumbersome when we need to describe the rotation of objects. So, when describing rotation, the polar coordinate system is generally used.
14.7K
Light Acquisition02:16

Light Acquisition

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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.
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相关实验视频

Updated: Jul 22, 2025

Scattering And Absorption of Light in Planetary Regoliths
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Scattering And Absorption of Light in Planetary Regoliths

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来自偏振的形状与远距离照明估计.

Youwei Lyu, Lingran Zhao, Si Li

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    此摘要是机器生成的。

    这项研究引入了一种新的方法,用于使用偏振图像和未知的照明恢复表面正常. 该方法估计照明以改善正常估计,优于现有的Shape-from-Polarisation技术.

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    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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    相关实验视频

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    Author Spotlight: Non-Invasive Imaging of Complex Bio-Structures Using Polarization-Sensitive Two-Photon Microscopy
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    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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    科学领域:

    • 计算机视觉 计算机视觉
    • 光学工程是指光学工程.
    • 材料科学 是一种材料科学.

    背景情况:

    • 表面正常恢复对于3D重建至关重要.
    • 现有的SfP方法通常依赖于先前的假设.
    • 极化成像提供丰富的几何和材料线索,但对照明敏感.

    研究的目的:

    • 开发一种新的方法,用于在未知的远距离照明下从极化图像中恢复表面正常.
    • 分析研究远距离照明估计在解决SfP模糊性的作用.
    • 提出一个学习框架,整合两极化,阴影,和正常的先验.

    主要方法:

    • 使用基于极度对称双向反射分布函数 (pBRDF) 的图像形成模型.
    • 开发了一个两阶段的学习框架,用于估计反射率,照明和精炼表面的正常值.
    • 创建了一个基于pBRDF模型的数据生成管道和一个用于评估的真实数据集.

    主要成果:

    • 拟议的两阶段框架有效地估计了照明和反射率.
    • 通过利用正常先验,提高了表面正常细节和准确性.
    • 该方法在现实数据上的现有方法中表现出优越的性能.

    结论:

    • 估计未知的远距离照明对准确地从极化图像中恢复表面正常有益.
    • 拟议的学习框架有效地整合了两极化,阴影和几何先验.
    • 该方法在定量和定性评估中取得了最先进的结果.