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相关概念视频

Inverse z-Transform by Partial Fraction Expansion01:20

Inverse z-Transform by Partial Fraction Expansion

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The inverse z-transform is a crucial technique for converting a function from its z-domain representation back to the time domain. One effective method for finding the inverse z-transform is the Partial Fraction Method, which involves decomposing a function into simpler fractions with distinct coefficients. These fractions correspond to known z-transform pairs, facilitating the inverse transformation process.
To begin the process, the poles of the function are identified and the function is...
749
Trigonometric Fourier series01:17

Trigonometric Fourier series

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Fourier series is a foundational mathematical technique that decomposes periodic functions into an infinite series of sinusoidal harmonics. This method enables the representation of complex periodic signals as sums of simple sine and cosine functions, facilitating their analysis and interpretation in various fields, including signal processing, acoustics, and electrical engineering.
The trigonometric Fourier series specifically expresses a periodic function with a defined period T using sine...
965
Convergence of Fourier Series01:21

Convergence of Fourier Series

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The Fourier series is a powerful mathematical tool for representing periodic signals as an infinite sum of complex exponentials. In practice, this infinite series is truncated to a finite number of terms, yielding a partial sum. This truncation makes the approximation of the signal feasible but introduces certain challenges, particularly near discontinuities, known as the Gibbs phenomenon.
The Gibbs phenomenon refers to the persistent oscillations and overshoots that occur near discontinuities...
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Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

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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...
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Exponential Fourier series01:24

Exponential Fourier series

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In audio signal processing, the exponential Fourier series plays a crucial role in sound synthesis, allowing complex sounds to be broken down into simpler sinusoidal components. This decomposition process is fundamental in analyzing and reconstructing musical notes and other audio signals. The exponential Fourier series expresses periodic signals as the sum of complex exponentials at both positive and negative harmonic frequencies, providing a powerful tool for signal analysis.
Euler's identity...
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Linearization and Approximation01:26

Linearization and Approximation

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Linearization is a mathematical technique used to approximate complex, nonlinear functions with simpler linear models in the vicinity of a chosen reference point. The method is based on the idea that, although a function may be difficult to evaluate exactly, its behavior near a specific input value can often be closely approximated by the tangent line at that point. This approach is particularly useful when small deviations from a known value are involved.Consider the square root function, for...
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相关实验视频

Updated: Mar 6, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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用麦克劳林系列扩展进行图像重建.

Gengsheng L Zeng1

  • 1Department of Computer Science, Utah Valley University, Orem, USA.

International journal of biomedical research & practice
|March 5, 2026
PubMed
概括

本理论研究介绍了富里埃域中的麦克劳林数列扩展,使得从有限的角度扫描数据中实现图像重建的完整数据采集,而无需事先的知识.

科学领域:

  • 医疗成像医学成像
  • 计算成像技术的成像
  • 图像重建 图像的重建

背景情况:

  • 当前的成像系统往往需要大量的数据来准确的图像重建.
  • 预先的知识或培训数据通常是强大的重建所必需的,特别是有限的测量.
  • 理论框架对于推进图像重建的基本理解至关重要.

研究的目的:

  • 用最小的数据研究一种用于图像重建的新理论方法.
  • 探索从一个小的扫描角度范围重建一个完整的数据集的可行性.
  • 开发一种可靠的重建方法,而不依赖于先前的知识或培训数据.

主要方法:

  • 在理想化条件下 (没有噪音,连续信号,完美的计算) 在里埃域中开发了麦克劳林数列扩展.
  • 在整个里埃空间中证明了这种扩张的收.
  • 利用计算机模拟来说明2D图像的重建从一个截断的福里埃-域麦克劳林系列扩展.

主要成果:

  • 表明,在里埃域中的麦克劳林数列扩展可以从有限的角度测量中获得完整的数据集.
  • 证实了膨胀的收,从理论上说可以实现完全的里埃空间覆盖.
  • 成功地使用截断扩展重建了一个2D空间域图像,验证了理论方法.
关键词:
这是一个近似的近似.中央切片定理 中央切片定理数据充足性的条件.整个功能的整个功能.富里叶变换是什么意思 富里叶变换具有有限支的函数具有有限支.图像重建 图像重建这是一个反向问题.混合高阶部分衍生品.泰勒系列的扩展.断层扫描 (Tomography) 是一个专业的技术.

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结论:

  • 理论框架支持使用显著减少的测量数据进行高保真图像重建的潜力.
  • 这种方法为实现数据效率高的成像提供了一条途径,无需事先信息或机器学习模型.
  • 虽然目前是理论上的,但这些发现为未来对实用,低数据成像系统的研究提供了基础.