fourier techniques 中文意思是什麼

fourier techniques 解釋
傅里葉法
  • fourier : n 1 傅立葉〈姓氏〉。2 Francois Marie Charles Fourier 弗朗瓦斯馬利沙利傅立葉〈1772 1837，法國空想...
  • techniques : 方法
  1. Fourier techniques provide a particular elegant framework from which to evolve a description of the formation of images.

    傅立葉方法提供了一個特別優美的框架，從它發展出一種描述成象的方法。
  2. From 1920s up to now, various techniques and methods for wave field decomposition, propagation and migration / imaging have been well developed, such as the kirchhoff asymptotic method, frequency - wavenumber domain phase - shift and phase - shift - plus - interpolation methods, and the one - way wave equation based phase - screen and generalized screen methods, etc. wave field extrapolation in these methods is implemented based on the expansion of the wave field by sets of basic functions like spatial fourier harmonies, modes, and green ' s functions

    自上個世紀二十年代至今，波場分解、傳播與偏移成像技術經歷了將近一個世紀的發展，形成了多種不同的方法，如kirchhoff波動方程高頻近似解方法，頻率-波數域的相移（ phase - shift ）方法和相移-內插（ pspi ）方法，以及在混合域中基於單向波動方程的相位屏、廣義屏方法等。
  3. 2. several theoretical analysis methods of fiber grating characteristics are presented, including the mode - coupling theory, transfer matrix method, multi - film method and fourier transfer method. the spectra of the fbg and lpg have been analyzed by these methods. the multiplexing techniques and fiber grating demodulation methods are introduced in this dissertation

    2 、系統介紹了光纖光柵的理論分析方法，並利用這些方法中的耦合模理論、傳輸矩陣法和傅立葉變換法對布拉格光柵、長周期光柵、啁啾光柵的光譜特性進行了分析並詳細介紹了光纖光柵傳感的復用技術和解調技術。
  4. Antialiasing in two - dimensional texture mappings is also discussed including a modified summed - area table algorithm. three - dimensional texture mappings are summarized including several procedural texture functions and fourier synthesis techniques

    在三維紋理方面，重點分析了幾種常用的過程紋理函數與fourier紋理合成技術，並對傳統的木紋函數進行了改進。
  5. Wavelet transforms overcome the shortcomings of fourier - based techniques because of wavelet ’ s advantage on flexible time - frequency windows. wavelet has been widely applied in numerical analysis, signal processing, and image processing. at present, lifting scheme is new method for constructing wavelets and performing wavelet transform

    小波變換克服了傳統fourier變換的不足，在時域和頻域都有良好的局部化特性，在數值分析，信號處理，圖像處理方面得到廣泛的應用，提升技術是構造小波和實現小波變換的一種新方法。
  6. Circular symmetric spread spectrum digital image watermarking using chaotic sequences as the watermark takes advantage of the discrete fourier transform properties and spread - spectrum communication techniques to embed a circular symmetric watermark in the frequency domain. the watermark can be detected without the presence of the original image even when the watermarked image suffers geometrical attacks such as translation, rotation and scaling. experimental results show that the proposed scheme has good transparency and highly good robustness to geometric transformations

    基於混沌序列的圓對稱擴頻水印方案是以實值混沌序列作為水印，根據離散傅立葉變換的特性並結合通信上的擴頻技術，將一圓對稱水印嵌入到了圖像的頻域中，且即使圖像遭受了平移、旋轉、縮放等幾何攻擊檢測水印也不需要原圖像。
  7. Related techniques and their applications are briefly reviewed in this paper, the conventional cross - correlation algorithm and the cross - correlation algorithm based on fast fourier transform ( fft ) are discussed

    本文簡要地回顧了piv技術的一些典型演算法和應用，研究了基本互相關演算法和基於快速傅立葉變換的互相關演算法。
  8. Engineering cases indicated : to apply the techniques of resonant demodulation can pick up micro shock pulses of hearing fault, and through analyzing the impact power fault vibration signal characteristics in the fourier chart of the resonant demodulation, the fault diagnosis will be easier

    工程實例表明，使用共振解調技術可以有效提取軸承故障微小脈沖沖擊，通過在共振解調傅里葉譜圖上分析沖擊功率故障振動信號特徵，可以較容易地進行故障診斷。
  9. Taking the mean - field model of a nonlinear resonator filled with two - level atomic medium as an example, we use spatial fourier filter techniques to select optical pattern, and first introduce the discrete random filter method which proved to be flexible and effective for the system having rotary invariability

    首次提出了離散隨機濾波方法，得到了豐富的斑圖結構，證明此法可以靈活有效地對斑圖進行選擇和控制。通過對注入泵浦光調制也實現了對這一系統斑圖的選擇。
  10. As a new embranchment of mathematics, wavelet analysis is the most perfect combination of the functional analysis, fourier analysis and numerical analysis. wavelet analysis has been widely used in signal processing, image manipulation, voice analysis, pattern recognition, quanta physics, biomedicine engineering, computer vision, fault diagnosis, some nonlinear fields and so on. in this dissertation, the fault diagnosis techniques based on wavelet analysis were investigated

    小波分析是一個新的數學分支，它是泛函分析、傅立葉分析、數值分析的最完美結晶；在應用領域，特別是在信號處理、圖象處理、語音分析、模式識別、量子物理、生物醫學工程、計算機視覺、故障診斷及眾多非線性科學領域都有廣泛的應用。
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