Results 41 to 50 of about 2,108,354 (300)
Compressive Optical Spectrometry Based on Sequency-Ordered Hadamard Transform
IEEE Photonics Journal, 2020 We propose a compressive Hadamard transform spectrometer (CHTS) based on the energy compaction trait of the sequency-ordered Hadamard matrix (SOHM), in which the spectrum is reconstructed from compressed measurements using simple matrix multiplication ...
Yi Zhang +3 more
doaj +1 more source
Optical full Hadamard matrix multiplexing and noise effects [PDF]
, 2009 Hadamard multiplexing provides a considerable SNR boost over additive random noise but Poisson noise such as photon noise reduces the boost. We develop the theory for full H-matrix Hadamard transform imaging under additive and Poisson noise effects.
Burling-Claridge, G. Robert +3 more
core +2 more sources
Characterization of Basic 5-Value Spectrum Functions Through Walsh-Hadamard Transform
IEEE Transactions on Information Theory, 2021 The first and the third authors recently introduced a spectral construction of plateaued and of 5-value spectrum functions. In particular, the design of the latter class requires a specification of integers $\{W(u):u\in \mathbb {F}^{n}_{2}\}$ , where ...
S. Hodžić, P. Horák, E. Pasalic
semanticscholar +1 more source
Nearly Optimal Deterministic Algorithm for Sparse Walsh-Hadamard Transform [PDF]
, 2015 For every fixed constant $\alpha > 0$, we design an algorithm for computing the $k$-sparse Walsh-Hadamard transform of an $N$-dimensional vector $x \in \mathbb{R}^N$ in time $k^{1+\alpha} (\log N)^{O(1)}$.
Cheraghchi, Mahdi, Indyk, Piotr
core +3 more sources
Complexity adaptation in H.264/AVC video coder for static cameras [PDF]
, 2009 H.264/AVC uses variable block size motion estimation (VBSME) to improve coding gain. However, its complexity is significant and fixed regardless of the required quality or of the scene characteristics. In this paper, we propose an adaptive complexity
Kim, Chanyul, O'Connor, Noel E.
core +1 more source
High Sensitivity Snapshot Spectrometer Based on Deep Network Unmixing
Sensors, 2020 Spectral detection provides rich spectral–temporal information with wide applications. In our previous work, we proposed a dual-path sub-Hadamard-s snapshot Hadamard transform spectrometer (Sub-s HTS).
Hui Xie +4 more
doaj +1 more source
Speech Encryption Algorithm Based on Nonorthogonal Quantum State with Hyperchaotic Keystreams
Advances in Mathematical Physics, 2020 With the advancement in modern computational technologies like cloud computing, there has been tremendous growth in the field of data processing and encryption technologies. In this contest there is an increasing demand for successful storage of the data
F. J. Farsana, K. Gopakumar
doaj +1 more source
An algorithm for discrete fractional Hadamard transform
, 2015 We present a novel algorithm for calculating the discrete fractional Hadamard transform for data vectors whose size N is a power of two. A direct method for calculation of the discrete fractional Hadamard transform requires $N^2$ multiplications, while ...
Cariow, Aleksandr +1 more
core +1 more source
Hadamard transform imaging [PDF]
, 1992 We have constructed a Hadamard transform Raman microscopic imaging system, and have developed it to a high definition (64K pixel) technique. We have demonstrated multispectral Raman imaging and developed the first three-dimensional (digital confocal) Raman imaging. We have explored the systematic errors in Hadamard multiplexing techniques and developed
openaire +3 more sources
Hadamard transform-based hyperspectral imaging using a single-pixel detector.
Optics Express, 2020 In this paper, a single-pixel hyperspectral imager is developed based on the Hadamard transformation. The imager's design, fabrication, signal processing method, and experimental results are discussed.
Qi Yi +5 more
semanticscholar +1 more source