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相关概念视频

Sample Handling01:02

Sample Handling

152
Transportation of samples from the collection point to the laboratory, as well as storage and preservation techniques, are crucial for maintaining sample integrity and ensuring accurate and reliable test results.
Samples should be transported carefully from collection points to the laboratory. They should be properly sealed and clearly labeled to prevent cross-contamination. To preserve the sample integrity, optimal temperature conditions during transport are essential. This could involve using...
152
Downsampling01:20

Downsampling

265
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...
265
Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

362
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...
362
Cross Product01:25

Cross Product

353
The cross product is a fundamental concept in vector algebra that is a vector operation on two different vectors to obtain a third vector. Unlike the scalar product, the cross product results in a vector quantity perpendicular to both the original vectors.
The magnitude of the cross product is obtained by multiplying the magnitude of both the vectors and the sine of the angle between them. This means that a larger angle between the vectors will lead to a greater magnitude of the cross product.
353
Aliasing01:18

Aliasing

240
Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
240
Upsampling01:22

Upsampling

323
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...
323

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相关实验视频

Updated: Sep 18, 2025

Video Movement Analysis Using Smartphones ViMAS: A Pilot Study
07:51

Video Movement Analysis Using Smartphones ViMAS: A Pilot Study

Published on: March 14, 2017

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使用跨组件样本偏移进行视频编码.

Han Gao, Xin Zhao, Tianqi Liu

    IEEE transactions on image processing : a publication of the IEEE Signal Processing Society
    |June 20, 2025
    PubMed
    概括
    此摘要是机器生成的。

    本研究介绍了交叉组件样本偏移 (CCSO),这是一种用于图像和视频压缩的新过方法. 通过利用颜色组件之间的相关性,CCSO提高了编码效率和视觉质量,实现了显著的编码收益.

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    相关实验视频

    Last Updated: Sep 18, 2025

    Video Movement Analysis Using Smartphones ViMAS: A Pilot Study
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    Published on: March 14, 2017

    16.9K
    Video-rate Scanning Confocal Microscopy and Microendoscopy
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    科学领域:

    • 数字图像和视频压缩.
    • 信号处理 信号处理
    • 信息理论是信息理论.

    背景情况:

    • 传统的压缩方法利用空间,时间和主观冗余.
    • 跨颜色组件冗余性为提高编码效率提供了一个新的途径.
    • 像Y'CbCr这样的颜色空间显示了光 (Y) 和色 (Cb/Cr) 组件之间的统计相关性.

    研究的目的:

    • 引入一种新的 in-loop 过方法,即交叉组件样本偏移 (CCSO),以改进图像和视频压缩.
    • 利用跨颜色组件冗余来提高编码效率和视觉质量.
    • 开发一种无乘法,非线性映射技术,用于生成校正信号.

    主要方法:

    • CCSO利用同位和相邻的光样生成校正信号.
    • 一个查找表实现了无乘法,非线性映射过程.
    • 该方法产生了对重建的光色或色彩样本应用的偏移值.

    主要成果:

    • 在图像和视频编码方面,CCSO表现出更好的编码效率和视觉质量.
    • 该方法在实验下一代视频编解码器中实现了0.81% (PSNR) 和0.69% (VMAF) 的平均编码收益.
    • 主观视觉质量通过CCSO方法显著提高.

    结论:

    • 在图像和视频压缩中,CCSO是一种有效的方法来利用跨颜色组件冗余性.
    • 通过AOMedia将CCSO纳入一个实验性的下一代视频编解码器,证实了它的实际意义.
    • 在保持或提高视觉保真性的同时,CCSO为实现更高的压缩比提供了一个有前途的解决方案.