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相关概念视频

Reducing Line Loss01:18

Reducing Line Loss

130
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...
130
IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

879
In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
879
Traveling Waves: Lossless Lines01:27

Traveling Waves: Lossless Lines

106
The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx  and a shunt capacitance CΔx.
106
Lossy Lines and Overvoltages01:22

Lossy Lines and Overvoltages

69
Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
69
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

71
Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
71
Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

145
Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
145

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相关实验视频

Updated: May 10, 2025

Lensless Fluorescent Microscopy on a Chip
11:23

Lensless Fluorescent Microscopy on a Chip

Published on: August 17, 2011

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基于波形系数概率建模和运行长度增强的哈夫曼编码的损失红外图像压缩.

Yaohua Zhu1,2,3, Ya Liu1,2,3, Yanghang Zhu1,2,3

  • 1Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China.

Sensors (Basel, Switzerland)
|April 26, 2025
PubMed
概括

这项研究介绍了Huf-RLC,这是一种用于红外图像的新型压缩方法,它结合了Huffman编码和运行长度编码. 与JPEG和JPEG2000相比,Huf-RLC显著提高了压缩效率和速度,特别是对于稀疏的数据.

关键词:
这就是为什么DWT DWT DWT哈夫曼编码 哈夫曼编码JPEG20002000年 在线视频图像有损压缩的压缩.红外线扫描图像的红外线扫描图像.

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相关实验视频

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科学领域:

  • 图像的处理和压缩.
  • 波形变换的波形变换.
  • 信息理论是信息理论.

背景情况:

  • 红外线扫描图像存在高冗余性和大文件大小的问题.
  • 现有的压缩方法,如JPEG2000 (MQ算法编码器) 和Huffman编码,在效率和速度上都有局限性,特别是含有众多零的稀疏数据.

研究的目的:

  • 为红外线扫描图像开发一种高效,快速的压缩方法.
  • 克服现有的压缩技术的局限性,特别是哈夫曼编码,在处理稀疏波形系数时.

主要方法:

  • 拟议的Huf-RLC:一种基于Huffman的方法,增强了运行长度编码 (RLC) 以利用零运行连续性.
  • 开发了一个波形系数概率模型来简化哈夫曼代码表生成.
  • 集成差分脉冲代码调制 (DPCM) 以减少低频子频段的空间冗余.

主要成果:

  • Huf-RLC优化了最短的代码编码,在稀疏分布中实现平均代码长度低于1位.
  • 拟议的方法在峰值信号噪声比率 (PSNR) 和结构相似度指数 (SSIM) 测量方面表现优于JPEG.
  • 实现了比JPEG2000快3.155倍的压缩速度和比JPEG快2.049倍的压缩速度,与JPEG2000相比,性能损失最小.

结论:

  • 与JPEG和JPEG2000相比,Huf-RLC提供了优越的红外图像压缩性能和速度,特别是在低比特率下.
  • 该方法有效地解决了稀疏数据和空间冗余的挑战,为红外图像压缩提供了可行的替代方案.