Results 101 to 110 of about 2,134,041 (173)

Pauli decomposition via the fast Walsh-Hadamard transform

New Journal of Physics
The decomposition of a square matrix into a sum of Pauli strings is a classical pre-processing step required to realize many quantum algorithms. Such a decomposition requires significant computational resources for large matrices. We present an exact and
Timothy N Georges, Bjorn K Berntson, Christoph Sünderhauf, Aleksei V Ivanov   +3 more
doaj   +1 more source

Application of Enhanced Hadamard Error Correcting Code in Video-Watermarking and his comparison to Reed-Solomon Code

MATEC Web of Conferences, 2017
Error Correcting Codes are playing a very important role in Video Watermarking technology. Because of very high compression rate (about 1:200) normally the watermarks can barely survive such massive attacks, despite very sophisticated embedding ...
Dziech Andrzej, Wassermann Jakob
doaj   +1 more source

Spatial and spatiotemporal volatility models: A review

Journal of Economic Surveys, EarlyView.
Abstract Spatial and spatiotemporal volatility models are a class of models designed to capture spatial dependence in the volatility of spatial and spatiotemporal data. Spatial dependence in the volatility may arise due to spatial spillovers among locations; that is, in the case of positive spatial dependence, if two locations are in close proximity ...
Philipp Otto, Osman Doğan, Süleyman Taşpınar, Wolfgang Schmid, Anil K. Bera   +4 more
wiley   +1 more source

Computationally Efficient Robust Color Image Watermarking Using Fast Walsh Hadamard Transform

Journal of Imaging, 2017
Watermark is the copy deterrence mechanism used in the multimedia signal that is to be protected from hacking and piracy such a way that it can later be extracted from the watermarked signal by the decoder.
Suja Kalarikkal Pullayikodi, Naser Tarhuni, Afaq Ahmed, Fahad Bait Shiginah   +3 more
doaj   +1 more source

Cointegrating Polynomial Regressions With Power Law Trends

Journal of Time Series Analysis, EarlyView.
ABSTRACT The common practice in cointegrating polynomial regressions (CPRs) often confines nonlinearities in the variable of interest to stochastic trends, thereby overlooking the possibility that they may be caused by deterministic components. As an extension, we propose univariate and multivariate CPRs that incorporate power law deterministic trends.
Yicong Lin, Hanno Reuvers
wiley   +1 more source

Hybrid Precoding-Beamforming Design With Hadamard RF Codebook for mmWave Large-Scale MIMO Systems

IEEE Access, 2017
This paper proposes a hybrid structure for multi-stream large-scale multi-input multi-output (MIMO) beamforming systems, in single-user scenario, using a Hadamard radio frequency (RF) codebook with low-bit resolution phase shifters. We show that Hadamard
Hussein Seleem, Ahmed Iyanda Sulyman, Abdulhameed Alsanie   +2 more
doaj   +1 more source

Comparison between Different Data Image Compression Techniques Applied on SAR Images

Iraqi Journal of Physics, 2008
In this paper, image compression technique is presented based on the Zonal transform method. The DCT, Walsh, and Hadamard transform techniques are also implements. These different transforms are applied on SAR images using Different block size.
Eanas Y. Al-Tae’e
doaj  

A new upper bound for the growth factor in Gaussian elimination with complete pivoting

Bulletin of the London Mathematical Society, EarlyView.
Abstract The growth factor in Gaussian elimination measures how large the entries of an LU factorization can be relative to the entries of the original matrix. It is a key parameter in error estimates, and one of the most fundamental topics in numerical analysis. We produce an upper bound of n0.2079lnn+0.91$n^{0.2079 \ln n +0.91}$ for the growth factor
Ankit Bisain, Alan Edelman, John Urschel
wiley   +1 more source

A Video Dual-Domain Blind Watermarking Algorithm Based on Hadamard Transform

Mathematics
Addressing the compatibility challenges surrounding the robustness and reversibility of existing video watermarking techniques, this study introduces a novel video dual-domain blind watermarking algorithm leveraging the Hadamard transform.
Yucheng Liang, Ke Niu, Yingnan Zhang, Yifei Meng, Fangmeng Hu   +4 more
doaj   +1 more source