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).
null Yuri Ariyanto +2 more
openaire +3 more sources
An approach to power system harmonic analysis based on triple-line interpolation discrete Fourier transform [PDF]
Archives of Electrical Engineering, 2022 The discrete Fourier transform (DFT) is a principal method for power system harmonic analysis. The fundamental frequency of the power system increases or decreases following load changes during normal operation.
Ling Liu, Jinsong Zhang
doaj +1 more source
Comparison of Image Compressions: Analog Transformations
Proceedings, 2020 A comparison between the four most used transforms, the discrete Fourier transform (DFT), discrete cosine transform (DCT), the Walsh–Hadamard transform (WHT) and the Haar-wavelet transform (DWT), for the transmission of analog images, varying their ...
Jose Balsa
doaj +1 more source
Recovering Missing Slices of the Discrete Fourier Transform using Ghosts [PDF]
, 2012 International audienceThe Discrete Fourier Transform (DFT) underpins the solution to many inverse problems commonly possessing missing or un-measured frequency information.
Chandra, Shekhar +2 more
core +3 more sources
Joint Channel Estimation Algorithm Based on DFT and DWT
Applied Sciences, 2022 Channel estimation is an important component of orthogonal frequency division multiplexing (OFDM) systems. The existence of virtual subcarriers leads to energy spreading in the time-domain when using Inverse Fast Fourier Transform (IFFT), resulting in ...
Zhe Zhang, Xin Bian, Mingqi Li
doaj +1 more source
Low-complexity LSMR equalisation of FrFT-based multicarrier systems in doubly dispersive channels [PDF]
, 2011 The discrete fractional Fourier transform (FrFT) has been suggested to enhance performance over DFT-based multicarrier systems when transmitting over doubly-dispersive channels.
Weiss, Stephan +7 more
core +1 more source
Extended Smoothing Methods for Sparse Test Data Based on Zero-Padding
Applied Sciences, 2023 Aiming at the problem of sparse measurement points due to test conditions in engineering, a smoothing method based on zero-padding in the wavenumber domain is proposed to increase data density.
Pan Zhou +5 more
doaj +1 more source
Simplified approach to DFT computation for nonprogrammable scientific calculators
Bibechana, 2014 Fourier analysis is an important tool used as it is or it’s different variants in many fields of sciences and engineering. It’s importance is due to it’s simplicity with which it expands a given function in terms of circular or complex exponents ...
Mohd Yusuf Yasin
doaj +3 more sources
Sensing Fractional Power Spectrum of Nonstationary Signals with Coprime Filter Banks
Complexity, 2020 The coprime discrete Fourier transform (DFT) filter banks provide an effective scheme of spectral sensing for wide-sense stationary (WSS) signals in case that the sampling rate is far lower than the Nyquist sampling rate.
Xiaomin Li +3 more
doaj +1 more source
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, Reza Agustina, Hidayatulloh -
openaire +1 more source