نتایج جستجو برای: 2D Fourier Transformation

تعداد نتایج: 357075  

Journal: :journal of mining and environment 2015
h. shahi r. ghavami riabi a. kamkar ruhani h. asadi haroni

in this research work, the frequency domain (fd) of surface geochemical data was analyzed to decompose the complex geochemical patterns related to different depths of the mineral deposit. in order to predict the variation in mineralization in the depth and identify the deep geochemical anomalies and blind mineralization using the surface geochemical data for the dalli cu-au porphyry deposit, a ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان 1390

we commence by using from a new norm on l1(g) the -algebra of all integrable functions on locally compact group g, to make the c-algebra c(g). consequently, we find its dual b(g), which is a banach algebra so-called fourier-stieltjes algebra, in the set of all continuous functions on g. we consider most of important basic theorems about this algebra. this consideration leads to a rather com...

2017
Rosa A Asmara Reza Agustina

Digital Image Watermarking is used recently to secure the image by embedding another digital image. It is typically used to identify ownership of the copyright of the signal. Frequency domain transformation methods used widely in Digital Image Compression and Digital Image Watermarking. They reduce the weakness of classics digital image watermarking such as Least Significant Bit (LSB) methods w...

2003
Eun-Young Elaine Kang Isaac Cohen Gérard Medioni

Camera stabilization is an important task for video analysis. In this report, we describe a method for estimating and stabilizing camera motion between two images via 2D image registration. Our approach is based on a pair-wise registration of images parameterized by 2D affine or projective transformation. Pair-wise image registration estimates transformation parameters for each pair of consecut...

2007

The concept of two-dimensional (2D) Fourier transformation in NMR was first introduced by Jeener (1) in 1971. Since that time, several hundred different 2D pulse schemes have been proposed in the literature. The selection of experiments that will be described is based on the insight they provide into the basis and generality of 2D NMR, and also on the importance for solving the most common type...

2009
Chris Pike Jeremy J. Wells

There is continuous research effort into the expansion and refinement of transform techniques for audio signal processing needs, yet the two-dimensional Fourier transform has seldom been applied to audio. This is probably because audio does not readily allow the application of a 2D transform, unlike images for which its use is common. A signal mapping is first required to obtain a two-dimension...

2012
Reinhold Behringer

When a 2D Fourier Transform is applied to piano roll plots which are often used in sequencer software, the resulting 2D graphic is a novel music visualization which reveals internal musical structure. This visualization converts the set of musical notes from the notation display in the piano roll plot to a display which shows structure over time and spectrum within a set musical time period. Th...

2013
Yang LIU Robert GOUTTE

The 2D Quaternionic Fourier Transform (QFT), applied to a real 2D image, produces an invertible quaternionic spectrum. If we conserve uniquely the first quadrant of this spectrum, it is possible, after inverse transformation, to obtain, not the original image, but a 2D quaternion image, which generalize in 2D the classical notion of 1D analytical image. From this quaternion image, we compute th...

2012
Alaidine Ben Ayed Mustapha Kardouchi Sid-Ahmed Selouani

This paper presents a new descriptor based on Shape Contexts, Fourier transform and Eigenshapes for radiological medical image retrieval. First shape context histograms are computed. Then, 2D FFT are performed on each 2D histogram to achieve rotation invariance. Finally, histograms are projected onto a more representative and lower dimensionality feature space that highlights the most important...

Journal: :Journal of structural biology 2007
Xiangyan Zeng Bryant Gipson Zi Yan Zheng Ludovic Renault Henning Stahlberg

Electron crystallography determines the structure of membrane proteins and other periodic samples by recording either images or diffraction patterns. Computer processing of recorded images requires the determination of the reciprocal lattice parameters in the Fourier transform of the image. We have developed a set of three programs 2dx_peaksearch, 2dx_findlat and 2dx_getlat, which can determine...

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