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相关概念视频

Downsampling01:20

Downsampling

745
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...
745
Upsampling01:22

Upsampling

682
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...
682
Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

816
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...
816
Sampling Methods: Overview01:06

Sampling Methods: Overview

3.7K
A sample refers to a smaller subset representative of a larger population. In analytical chemistry, studying or analyzing an entire population is often impractical or impossible. Therefore, samples are used to draw inferences and generalize the whole population. The sampling method selects individuals or items from a population to create a sample. Standard sampling methods include random, judgemental, systematic, stratified, and cluster sampling. 
In analytical chemistry, the choice of...
3.7K
Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

813
In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...
813
Linear Approximation in Time Domain01:21

Linear Approximation in Time Domain

388
Nonlinear systems often require sophisticated approaches for accurate modeling and analysis, with state-space representation being particularly effective. This method is especially useful for systems where variables and parameters vary with time or operating conditions, such as in a simple pendulum or a translational mechanical system with nonlinear springs.
For a simple pendulum with a mass evenly distributed along its length and the center of mass located at half the pendulum's length,...
388

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相关实验视频

Updated: Mar 15, 2026

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

Published on: December 3, 2013

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利用时间下方采样结构和时空融合,实现高效的视频编码.

Keren He1, Yufei Gao1, Qi Wang1

  • 1Graduate School of Science and Engineering, Hosei University, Tokyo 184-8584, Japan.

Sensors (Basel, Switzerland)
|March 14, 2026
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的时间下方采样视频压缩系统. 它保留了关键并增强了中间,大大提高了压缩效率并降低了与VVC和HEVC标准相比的数据速率.

关键词:
深度学习是一种深度学习.低比特率的低比特率视频编码 视频编码视频增强功能 视频增强功能

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Swin-PSAxialNet: An Efficient Multi-Organ Segmentation Technique
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Swin-PSAxialNet: An Efficient Multi-Organ Segmentation Technique

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相关实验视频

Last Updated: Mar 15, 2026

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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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:

  • 计算机视觉 计算机视觉
  • 图像和视频处理 图像和视频处理
  • 数据压缩数据压缩

背景情况:

  • 现代视频压缩依赖于下方采样,但当前的方法忽视了时空冗余,导致信息丢失.
  • 现有系统中统一的下采样降低了压缩效率和视频质量.

研究的目的:

  • 提出一个先进的时间下方采样视频压缩系统,解决当前方法的局限性.
  • 通过保护关键和智能降低采样中间来提高压缩效率.

主要方法:

  • 引入了一种新的时间向下采样策略,选择性地向下采样中间,同时保留高质量的关键.
  • 在解码器中采用了一个循环增强机制,以利用时间冗余.
  • 一个多尺度的时空注意 (MTSA) 模块,包括多时空注意 (MTA) 和金字塔空间注意 (PSA),是为增强阶段设计的.

主要成果:

  • 拟议的系统在各种配置 (All-Intra,Low-Delay-P,随机访问) 中实现了一致的BD率降低.
  • 与通用视频编码 (VVC) 标准相比,I,P和B的BD率显著降低14%至39%.
  • 该方法在现有方法,包括基于高效视频编码 (HEVC) 标准的方法中表现出优越的性能.

结论:

  • 拟议的时间向下采样系统有效地利用空间和时间冗余来改善视频压缩.
  • MTSA模块在通过建模时间相关性和空间突出度来提高质量方面发挥着至关重要的作用.
  • 这种方法为下一代视频压缩提供了一个有希望的方向,其性能优于当前的最先进标准.