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相关概念视频

Buffer Effectiveness02:19

Buffer Effectiveness

49.1K
Buffer solutions do not have an unlimited capacity to keep the pH relatively constant . Instead, the ability of a buffer solution to resist changes in pH relies on the presence of appreciable amounts of its conjugate weak acid-base pair. When enough strong acid or base is added to substantially lower the concentration of either member of the buffer pair, the buffering action within the solution is compromised.
The buffer capacity is the amount of acid or base that can be added to a given volume...
49.1K
Upsampling01:22

Upsampling

254
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
254
Pulse amplitude and quality01:17

Pulse amplitude and quality

1.8K
Pulse amplitude is a crucial indicator of cardiac health because it provides valuable insights into the strength of left ventricular contractions and the overall uniformity of blood circulation within the vasculature. The strength of the pulse is directly related to the force with which the heart contracts and the volume of blood being pumped.
A weak or absent pulse may indicate reduced cardiac output or poor left ventricular contraction, which can be signs of cardiovascular dysfunction or...
1.8K
Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

136
Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
136
Buffers: Buffer Capacity01:09

Buffers: Buffer Capacity

1.3K
Buffer capacity is the quantitative measure of a buffer to resist the change in pH. As shown in the following equation, the buffer capacity, denoted by 'beta', is expressed as the number of moles of acid or base needed to change the pH of a one-liter buffer solution by 1 unit. Here, Ca and Cb indicate the number of moles of acid and base, respectively. Note that dpH represents the change in pH.
In the graph, pH is plotted as a function of the number of moles of base (Cb) added to a weak...
1.3K
Downsampling01:20

Downsampling

177
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.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
177

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相关实验视频

Updated: Jul 15, 2025

Using Electroencephalography Measurements and High-quality Video Recording for Analyzing Visual Perception of Media Content
10:41

Using Electroencephalography Measurements and High-quality Video Recording for Analyzing Visual Perception of Media Content

Published on: May 26, 2018

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SUR驱动的视频编码速率控制,以共同优化感知质量和缓冲控制.

Zetao Yang, Wei Gao, Ge Li

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    |September 28, 2023
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    概括
    此摘要是机器生成的。

    这项研究引入了一种用于视频编码的新速率控制方法,可以提高人类视觉质量和缓冲区稳定性. 该方法使用满意用户比率 (SUR) 建模和感知缓冲速率控制 (PBRC) 来改善视频体验.

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    High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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    Using Electroencephalography Measurements and High-quality Video Recording for Analyzing Visual Perception of Media Content
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    High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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    科学领域:

    • 视频编码 视频编码
    • 图像和视频处理 图像和视频处理
    • 计算机视觉 计算机视觉

    背景情况:

    • 速率控制在视频编码中至关重要,但在优化人类视觉体验和缓冲区稳定性方面仍然存在挑战.
    • 视频中的剧烈运动可以掩盖由于人类视觉系统 (HVS) 限制的扭曲,而波动的比特率会导致缓冲器不稳定.
    • 现有的方法难以平衡感知质量与缓冲管理,特别是在高动作场景中.

    研究的目的:

    • 为HEVC (高效视频编码) 提出一个新的联合费率控制方案.
    • 为了最大限度地提高人类视觉感知质量,同时防止缓冲器下流和溢出.
    • 通过减少跳转来提高整体重建的视频质量.

    主要方法:

    • 引入了满意用户比率 (SUR) 度量,用于在速率控制范围内建模人类视觉质量.
    • 开发了快速视觉多方法评估融合 (VMAF) 质量预测 (FVQP) 以有效地生成SUR曲线.
    • 建立了一个双重目标优化框架,集成感知建模和感知缓冲器速率控制 (PBRC).

    主要成果:

    • 拟议的联合速率控制计划有效地利用SUR.使用人类视觉质量的模型.
    • FVQP实现了具有负担得起的计算复杂性的SUR曲线生成.
    • 双重目标优化框架允许在视觉质量和缓冲区稳定性之间灵活调整优先级.
    • 实验结果显示,与现有方法相比,改善了人类视觉体验和增强了缓冲器稳定性,减少了跳过.

    结论:

    • 新的联合速率控制方案成功地解决了人类视觉体验的局限性和视频编码中的缓冲区稳定性.
    • 集成基于SUR的感知建模和PBRC提供了一种灵活有效的方法来优化视频质量.
    • 拟议的方法在增强视觉感知和稳定缓冲器方面表现出卓越的性能,从而导致更好的重建视频质量.