Results 41 to 50 of about 15,386 (194)

Information preserved guided scan pixel difference coding for medical images

, 1995
This paper analyzes the information content of medical images, with 3-D MRI images as an example, in terms of information entropy. The results of the analysis justify the use of Pixel Difference Coding for preserving all information contained in the ...
Takaya, Kunio, Tannous, C., Yuan, Li
core   +1 more source

Miniature Robotic Swimmer with Precise 2D Motion Control via Acoustic Vortex‐Induced Propulsion

Advanced Science, EarlyView.
In this work, a miniature robotic swimmer achieves precise 2D motion using sound waves with customized 3D‐printed lenses. Localized acoustic vortices drive both translation and rotation of the swimmer without mechanical parts. This contactless approach offers a novel route to controlled micro‐scale movement, with promising applications in biomedical ...
Chadi Ellouzi, Nicholas Andrianto, Glen Vosgerichian, Farhood Aghdasi, Joshua Lloyd, Ali Zabihi, Chen Shen   +6 more
wiley   +1 more source

Lossless Astronomical Image Compression and the Effects of Noise

, 2009
We compare a variety of lossless image compression methods on a large sample of astronomical images and show how the compression ratios and speeds of the algorithms are affected by the amount of noise in the images.
Pence, W. D., Seaman, R., White, R. L.
core   +1 more source

Photonic Time Crystals and Time‐Varying Electromagnetic Metamatter: A New Direction for Ultrafast Tunable Photonic and Microwave Materials and Devices

Advanced Science, EarlyView.
Photonic time crystals (PTCs) are systems in which electromagnetic parameters are modulated periodically in time, producing momentum bandgaps via temporal scattering rather than spatial Bragg processes. This review examines the theoretical frameworks, modeling, and computational tools for time‐varying media, and summarizes experimental demonstrations ...
Ranjan Kumar Patel, Shriram Ramanathan, Ronald P. Jenkins, Michael J. Carter   +3 more
wiley   +1 more source

Spectral Distortion in Lossy Compression of Hyperspectral Data

Journal of Electrical and Computer Engineering, 2012
Distortion allocation varying with wavelength in lossy compression of hyperspectral imagery is investigated, with the aim of minimizing the spectral distortion between original and decompressed data.
Bruno Aiazzi, Luciano Alparone, Stefano Baronti, Cinzia Lastri, Massimo Selva   +4 more
doaj   +1 more source

Lossless Compression in Bayer Color Filter Array for Capsule Endoscopy

IEEE Access, 2017
This paper presents a compression algorithm for color filter array (CFA) images in a wireless capsule endoscopy system. The proposed algorithm consists of a new color space transformation (known as YLMN), a raster-order prediction model, and a single ...
Shahed K. Mohammed, K. M. Mafijur Rahman, Khan A. Wahid   +2 more
doaj   +1 more source

3D‐Printed Aerogel Metamaterials with Multiple Heterogeneous Interfaces Enables Integrated Control of Microwave Field, Acoustic Field, and Thermal Field

Advanced Science, EarlyView.
The Direct‐Ink‐Writing (DIW) 3D‐printed aramid nanofibers (ANF)/carbon nanotubes (CNT)/liquid metal (LM) aerogel metamaterial demonstrates an effective and lightweight strategy to achieve polarization insensitive & ultra‐wideband microwave absorption from 2.65‐18 GHz, broadband noise reduction effect in the 2800‐6400 Hz and thermal suppression ...
Yijie Liu, Kokila Khanal, Weimeng Chu, Sreekanth Ginnaram, Yijing Zhao, Chunlin Jia, Udeshwari Jamwal, Jiaqi Tao, Lvtong Duan, Wentao Yan, Yong Yang   +10 more
wiley   +1 more source

Compression of Multichannel Signals With Irregular Sampling Rates and Data Gaps

IEEE Access
In this work, we study the compression of multichannel signals with irregular sampling rates and data gaps. We consider state-of-the-art algorithms, which were originally designed to compress gapless signals with regular sampling, adapt them to operate ...
Pablo Cervenansky, Alvaro Martin, Gadiel Seroussi   +2 more
doaj   +1 more source

Realization of a Bilayer Elastic Topological Insulator

Advanced Science, EarlyView.
Bilayer elastic wave topological insulators are experimentally realized, introducing the layer degree of freedom to access four topological phases. This enables diverse domain walls and transmission behaviors, including interlayer conversion and beam splitting.
Chengzhi Ma, Zhiwei Song, Zheyu Cheng, Jiu Hui Wu, Baile Zhang   +4 more
wiley   +1 more source

Flexible Memory: Progress, Challenges, and Opportunities

Advanced Intelligent Discovery, EarlyView.
Flexible memory technology is crucial for flexible electronics integration. This review covers its historical evolution, evaluates rigid systems, proposes a flexible memory framework based on multiple mechanisms, stresses material design's role, presents a coupling model for performance optimization, and points out future directions.
Ruizhi Yuan, Sen Chen, Minghui Guo, Ziliang Cui, Yujie Du, Jing Liu   +5 more
wiley   +1 more source