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相关概念视频

Reducing Line Loss01:18

Reducing Line Loss

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In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss...
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Uniform Depth Channel Flow: Problem Solving01:18

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To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
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Uniform Depth Channel Flow01:27

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Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
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Downsampling01:20

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When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
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Vector Components in the Cartesian Coordinate System01:29

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Vectors are usually described in terms of their components in a coordinate system. Even in everyday life, we naturally invoke the concept of orthogonal projections in a rectangular coordinate system. For example, if someone gives you directions for a particular location, you will be told to go a few km in a direction like east, west, north, or south, along with the angle in which you are supposed to move. In a rectangular (Cartesian) xy-coordinate system in a plane, a point in a plane is...
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Complex numbers, represented in Cartesian coordinates, can also be visualized as vectors. These vectors can be expressed in polar form, emphasizing their magnitude and angle. When a complex number is input into a function, the output is another complex number, highlighting the function's zero point from which the vector representation can originate.
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Updated: Jul 9, 2025

Combining Eye-tracking Data with an Analysis of Video Content from Free-viewing a Video of a Walk in an Urban Park Environment
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基于视频的点云压缩低复杂度编码单元决定

Wei Gao, Hang Yuan, Ge Li

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    此摘要是机器生成的。

    本研究介绍了使用基于视频的点云压缩 (V-PCC) 压缩3D点云数据的更快方法. 新的算法大大减少了投影视频的编码时间,同时保持了高数据质量.

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    科学领域:

    • 计算机视觉 计算机视觉
    • 多媒体信号处理处理.
    • 数据压缩数据压缩

    背景情况:

    • 基于视频的点云压缩 (V-PCC) 使用2D视频编码来实现动态的3D点云.
    • V-PCC的计算复杂性导致投影视频的编码时间很长.

    研究的目的:

    • 开发一个低复杂度的算法来加速V-PCC内部编码.
    • 为了减少V-PCC中的投影序列压缩的时间消耗.

    主要方法:

    • 为V-PCC内部编码提出了一个低复杂度的编码单元决策算法.
    • 探索了占用,几何和属性序列之间的交叉投影信息,以改善CU分区预测.
    • 开发了一种以速率扭曲为导向的学习方法,用于准确的CU分区决策.
    • 设计了一个总体框架,用于V-PCC内部/内部编码的有针对性的特征提取.

    主要成果:

    • 总投影序列压缩的时间消耗减少了57.80%.
    • 实现了微不足道的编码损失:0.08% (Geom.BD-TotalRate D1),0.33% (Geom.BD-TotalRate D2) 和0.16% (Attr.BD-TotalRate Luma). 这两种编码损失都是可以忽略的.
    • 证明了加速V-PCC All-Intra投影序列压缩的最先进性能.

    结论:

    • 拟议的算法有效地加速了V-PCC投影序列压缩.
    • 该方法可以节省大量的时间,对编码效率的影响最小.
    • 这项工作为高效的动态点云压缩提供了有价值的解决方案.