Results 31 to 40 of about 467 (179)

Optical Bit-Plane-Based 3D-JST Cryptography Algorithm With Cascaded 2D-FrFT Encryption for Efficient and Secure HEVC Communication

IEEE Access, 2021
The rapid growth of multimedia communication systems has expanded the High-Efficiency Video Coding (HEVC) security applications precipitously. Therefore, there is an urgent, elevated need to protect and secure the HEVC content during streaming and ...
Walid El-Shafai, Iman M. Almomani, Aala Alkhayer   +2 more
doaj   +1 more source

A TC‐Based Multicomponent LFM Signal Characterization Method Under Impulsive Noise and Its Application

IET Signal Processing, Volume 2026, Issue 1, 2026.
The burst‐like and high‐amplitude characteristics of impulsive noise, which markedly differ from those of Gaussian noise, render methods based on the Gaussian assumption unable to accurately characterize signals under impulsive noise. Moreover, when dealing with multicomponent signal, existing impulsive noise suppression methods inevitably introduce ...
Weiwei Shang, Yong Guo, Lidong Yang, Tianyuan Liu   +3 more
wiley   +1 more source

Oncogenomic profiling in infant–toddler T‐ALL identifies NKX2 family genes as drivers linked to favorable outcomes

HemaSphere, Volume 9, Issue 5, May 2025.
Abstract T‐cell acute lymphoblastic leukemia (T‐ALL) is a rare and aggressive hematological malignancy primarily affecting adolescents and young adults and is scarce in infants and toddlers under age 3. Unlike B‐ALL, T‐ALL in this young population remains poorly characterized due to limited data and lacks evidence‐based guidelines to help clinicians ...
Manon Delafoy, Estelle Balducci, Mathieu Simonin, Antoine Pinton, Guillaume Charbonnier, Lucien Courtois, Ludovic Lhermitte, Camille Gillet, Mélanie Féroul, Aurore Touzart, Agata Cieslak, Charlotte Smith, Marianne Courgeon, Margaux Wiber, Thomas Mercher, Sylvain Latour, Isabelle Arnoux, Paul Saultier, Pierre‐Simon Rohrlich, Damien Bodet, Nathalie Grardel, Marion Lubnau, Isabelle Pellier, Sandrine Thouvenin, Nathalie Garnier, Cédric Pastoret, Benoit Brethon, Arnaud Petit, Elizabeth Macintyre, André Baruchel, Vahid Asnafi   +30 more
wiley   +1 more source

Parameter Estimation of Chirp for Underwater Acoustic Channel

MATEC Web of Conferences, 2018
To overcome the performance degradation of conventional Chirp parameters estimation methods in underwater acoustic multipath channels, a novel parameters estimation method based on Fractional Fourier transform (FRFT) and Fourier transform (FFT) was ...
Junhui FAN, Hua PENG, Chi WEI
doaj   +1 more source

Fast and Accurate Refocusing for Moving Ships in SAR Imagery Based on FrFT

Remote Sensing, 2023
Synthetic aperture radar (SAR) is capable of monitoring the ocean all day, regardless of weather conditions. However, moving ships exhibit azimuth defocus in SAR images, which severely hampers ship recognition performance.
Jin Wang, Xiangguang Leng, Zhongzhen Sun, Xi Zhang, Kefeng Ji   +4 more
doaj   +1 more source

Frequency Domain Adaptive Filters in Vision Transformers for Small‐Scale Datasets

IET Computer Vision, Volume 19, Issue 1, January/December 2025.
This paper introduces the Multi‐Head Adaptive Filter Frequency Vision Transformer (MAF‐FViT), a novel Vision Transformer model that replaces self‐attention with frequency‐domain adaptive filtering to improve computational efficiency and feature extraction.
Oscar Ondeng, Peter Akuon, Heywood Ouma
wiley   +1 more source

Pseudopolar Format Matrix Description of Near-Range Radar Imaging and Fractional Fourier Transform

Remote Sensing
Near-range radar imaging (NRRI) has evolved into a vital technology with diverse applications spanning fields such as remote sensing, surveillance, medical imaging and non-destructive testing.
Lilong Zou, Ying Li, Amir M. Alani
doaj   +1 more source

Velocity estimation and compensation approach for SFW radar visa IGSS

Electronics Letters, Volume 61, Issue 1, January/December 2025.
This paper introduces a pioneering velocity estimation technique utilizing the fractional Fourier transform (FrFT) to address these limitations. Leveraging the characteristic of the Doppler signal from a moving target, which manifests as a chirp signal with a rate proportional to the target's velocity, the FrFT is utilized for precise velocity ...
Bo Peng, Caixia Qiao, Qile Chen
wiley   +1 more source

A robust and secure watermarking algorithm based on DWT and SVD in the fractional order fourier transform domain

Array, 2022
The present paper aims to develop and validate a robust and secure watermarking algorithm. Firstly, the algorithm transforms the cover image and the watermark image separately by FRFT to obtain the amplitudes of both the cover image and watermark image ...
Ming Tang, Fuken Zhou
doaj   +1 more source

Discrete Entropic Uncertainty Relations Associated with FRFT

Journal of Signal and Information Processing, 2013
Based on the definition and properties of discrete fractional Fourier transform (DFRFT), we introduced the discrete Hausdorff-Young inequality. Furthermore, the discrete Shannon entropic uncertainty relation and discrete Renyi entropic uncertainty relation were explored.
Guanlei Xu, Xiaotong Wang, Lijia Zhou, Limin Shao, Xiaogang Xu   +4 more
openaire   +2 more sources