Results 1 to 10 of about 257,484 (138)

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
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STEGANOGRAFI MENGGUNAKAN METODE DISCRETE FOURIER TRANSFORM (DFT)

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, Rizky Ardiansyah, Bias Paris   +2 more
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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
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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
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Analisis Watermarking Menggunakan Metode Discrete Cosine Transform (DCT) dan Discrete Fourier Transform (DFT)

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, Yohanssen Pratama, null Purnama Pasaribu, null Josua Rumahorbo, null Bona Simanullang   +4 more
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Convolutional Neural Network (CNN) to Reduce Construction Loss in JPEG Compression Caused by Discrete Fourier Transform (DFT)

, 2023
In recent decades, digital image processing has gained enormous popularity. Consequently, a number of data compression strategies have been put forth, with the goal of minimizing the amount of information required to represent images. Among them, JPEG compression is one of the most popular methods that has been widely applied in multimedia and digital ...
Suman Kunwar
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KLASIFIKASI DAN PENINGKATAN KUALITAS CITRA SIDIK JARI MENGGUNAKAN DFT (DISCRETE FOURIER TRANSFORM)

Jurnal Infomedia, 2016
Sidik jari merupakan suatu komponen biometrik yang sering digunakan sebagai alat identifikasi yang terbukti cukup efektif karena sifatnya yang universal, unik, dan permanen pada setiap manusia. Berdasarkan jenis nya sidik jari memiliki 4 jenis yaitu berminyak, normal, kering, dan kotor.Sidik jari kering yang secara kasat mata dapat dilihat adanya garis
Cilla Sundari, Hari Toha Hidayat, Muhammad Nasir   +2 more
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A new discrete fractional Fourier transform based on constrained eigendecomposition of DFT matrix by Lagrange multiplier method [PDF]

IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 1999
This paper is concerned with the definition of the discrete fractional Fourier transform (DFRFT). First, an eigendecomposition of the discrete Fourier transform (DFT) matrix is derived by sampling the Hermite Gauss functions, which are eigenfunctions of the continuous Fourier transform and by performing a novel error-removal procedure. Then, the result
Pei, Soo-Chang, Tseng, Chien-Cheng, Yeh, Min-Hung   +2 more
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Multiplicative complexity of the two-dimensional discrete Fourier transform DFT (2 ⁿ ; 2)

Electronics Letters, 1988
We show that the two-dimensional discrete Fourier transform DFT (2n; 2) can be transformed into a series of distinct second versions of the discrete cosine transform DCT. As a result of the minimal number of real multiplications over the field Q to compute the length 2n second version DCT, we derive the minimum number of real multiplications over the ...
Wann-Jiun Ma, Dong Yang
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Multi Resolution Lattice Discrete Fourier Transform (MRL-DFT) [PDF]

Computer Science & Information Technology (CS & IT), 2017
Fred L. Fontaine
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