Results 1 to 10 of about 305,480 (229)
STEGANOGRAFI MENGGUNAKAN METODE DISCRETE FOURIER TRANSFORM (DFT) [PDF]
Jurnal Informatika Polinema, 2018 Seiring dengan kemajuan teknologi, serangan terjadi pada industri photography di mana banyak penyalahgunaan foto yang memiliki hak cipta tanpa seijin pemilik foto tersebut. Karena itulah dibuat sebuah aplikasi yang berfungsi untuk menyisipkan watermark dengan menggunakan metode DFT (Discrete Fourier Transform).
Yuri Ariyanto +2 more
core +4 more sources
The Discrete Fourier Transform (DFT) in Behavioural Analysis
Journal of Theoretical Biology, 1994 Abstract Spectral analysis is an important tool for examining time-series data and can be particularly powerful in detecting periodicity in animal behaviour patterns. Because of its simplicity and the speed of current computing algorithms, the discrete Fourier transform is most often used in spectral analysis.
T.G. Forrest, Robert B. Suter
openaire +3 more sources
Comparison of Discrete Cosine Transforms (DCT), Discrete Fourier Transforms (DFT), and Discrete Wavelet Transforms (DWT) in Digital Image Watermarking [PDF]
International Journal of Advanced Computer Science and Applications, 2017 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.
Rosa A, Hidayatulloh, Reza Agustina
openaire +3 more sources
Discrete Fourier Transform (DFT)-Based Computational Intelligence Model for Urban Carbon Emission and Economic Growth [PDF]
Mathematical Problems in Engineering, 2022 Economic development leads to the widespread use of energy, which results in carbon emissions. In order to determine the correlation between different urban carbon emissions and fiscal growth, a coupling and coordination model of urban carbon emissions and economic growth based on discrete Fourier transform (DFT) is constructed.
Chun Fu, Xiayun Gui, Farzana Akter
openaire +2 more sources
An Orthogonal Discrete Auditory Transform [PDF]
arXiv, 2005 An orthogonal discrete auditory transform (ODAT) from sound signal to spectrum is constructed by combining the auditory spreading matrix of Schroeder et al and the time one map of a discrete nonlocal Schr\"odinger equation. Thanks to the dispersive smoothing property of the Schr\"odinger evolution, ODAT spectrum is smoother than that of the discrete ...
Qi, Yingyong, Xin, Jack
arxiv +3 more sources
Steerable Discrete Fourier Transform [PDF]
, 2017 Directional transforms have recently raised a lot of interest thanks to their numerous applications in signal compression and analysis. In this letter, we introduce a generalization of the discrete Fourier transform, called steerable DFT (SDFT). Since the DFT is used in numerous fields, it may be of interest in a wide range of applications.
Fracastoro, Giulia, Magli, Enrico
arxiv +3 more sources
Jurnal Sistem Cerdas, 2022 Digital image watermarking is the insertion of watermarks into digital image media. Several types of watermarking methods used are Discrete Cosine Transform (DCT) and Discrete Fourier Transform (DFT). Both of these watermarking methods work in the frequency domain (transform).
null Mukhammad Solikhin +4 more
openaire +3 more sources
On the diagonalization of the discrete Fourier transform [PDF]
arXiv, 2008 The discrete Fourier transform (DFT) is an important operator which acts on the Hilbert space of complex valued functions on the ring Z/NZ. In the case where N=p is an odd prime number, we exhibit a canonical basis of eigenvectors for the DFT. The transition matrix from the standard basis to the canonical basis defines a novel transform which we call ...
Gurevich, Shamgar, Hadani, Ronny
arxiv +6 more sources
On the Performance of Turbo Signal Recovery with Partial DFT Sensing Matrices [PDF]
, 2015 This letter is on the performance of the turbo signal recovery (TSR) algorithm for partial discrete Fourier transform (DFT) matrices based compressed sensing. Based on state evolution analysis, we prove that TSR with a partial DFT sensing matrix outperforms the well-known approximate message passing (AMP) algorithm with an independent identically ...
Ma, Junjie, Ping, Li, Yuan, Xiaojun
arxiv +4 more sources
Recovering Missing Slices of the Discrete Fourier Transform using Ghosts [PDF]
, 2010 The Discrete Fourier Transform (DFT) underpins the solution to many inverse problems commonly possessing missing or un-measured frequency information. This incomplete coverage of Fourier space always produces systematic artefacts called Ghosts. In this paper, a fast and exact method for de-convolving cyclic artefacts caused by missing slices of the DFT
Chandra, Shekhar S. +4 more
arxiv +4 more sources