Results 231 to 240 of about 2,149,393 (281)

Hadamard-Transform Exhaust-Analysis Spectrometer

Applied Optics, 1971
We propose a novel instrument for automobile exhaust analysis based on a Hadamard-transform spectrometer, which would be able to make accurate measurements of the concentration of several pollutants simultaneously, would be operated by unskilled personnel, and would complete a measurement scan in less than 1 sec.
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Hadamard transform raman spectroscopy

Chemometrics and Intelligent Laboratory Systems, 1988
Hadamard transform spectroscopy is showing signs of emerging again even though turf protectors would prefer that it remain benign. In this discussion, some of its advantages, and there are some, and some of its disadvantages, and there are some of those as well, are discussed.
W. G. Fateley, D. C. Tilotta, James E. Griffiths   +2 more
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A New Fast Algorithm for Discrete Fractional Hadamard Transform

IEEE Transactions on Circuits and Systems Part 1: Regular Papers, 2019
This paper proposes a new fast algorithm for calculating the discrete fractional Hadamard transform for data vectors whose size $N$ is a power of two. A direct method for the calculation of the discrete fractional Hadamard transform requires $O(N^{2})$
A. Cariow, D. Majorkowska-Mech, Janusz P. Papliński, G. Cariowa   +3 more
semanticscholar   +1 more source

Hadamard transform spectrometry

Chemometrics and Intelligent Laboratory Systems, 1991
Abstract Dyer, S.A., 1991. Hadamard transform spectrometry. Chemometrics and Intelligent Laboratory Systems, 12: 101–115. Hadamard transform spectrometry (HTS) provides a means of obtaining a multiplex advantage with a dispersive spectrometric technique.
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An improved blind watermarking method facing dual color images based on Hadamard transform

Soft Computing - A Fusion of Foundations, Methodologies and Applications, 2023
Siyu Chen, Qingtang Su, Huanying Wang, Gang Wang   +3 more
semanticscholar   +1 more source

Quaternion Hadamard Transform and QR Decomposition Based Robust Color Image Watermarking

2019 3rd International Conference on Trends in Electronics and Informatics (ICOEI), 2019
A robust watermarking method depending on Quaternion Hadamard Transform (QHT) and QR decomposition is proposed. The QHT can preserve the relationship among the rgb component and color information.
K. Prabha, M J Vaishnavi, I. S. Sam
semanticscholar   +1 more source

Hadamard transform image coding

Proceedings of the IEEE, 1969
The introduction of the fast Fourier transform algorithm has led to the development of the Fourier transform image coding technique whereby the two-dimensional Fourier transform of an image is transmitted over a channel rather than the image itself. This devlopement has further led to a related image coding technique in which an image is transformed by
W.K. Pratt, J. Kane, H.C. Andrews
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BIFORE or Hadamard transform

IEEE Transactions on Audio and Electroacoustics, 1971
BIFORE or Hadamard transform is defined and several of its properties are developed. BIFORE power and phase spectra are developed and their frequency-sequency composition is explored. Using matrix partitioning, fast algorithms for efficient computation of BIFORE coefficients and power and phase spectra are developed.
N. Ahmed, K. Rao, A. Abdussattar
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Large symmetric π transformations for Hadamard transforms

Applied Optics, 1983
Many multiplexing instruments utilize the fast Hadamard transform (FHT) to demultiplex the signal. In the past, the FHT includes the π1 and π2 transformations to reorder vectors before and after a Sylvester-type Hadamard transform. Although the computational effort involved in the π1 and the Sylvester-type Hadamard transform scales as n log2n ...
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Hadamard Transform-Based Optimized HEVC Video Coding

IEEE transactions on circuits and systems for video technology (Print), 2019
The High Efficiency Video Coding (HEVC/H.265) standard achieves great improvement in compression efficiency over the widely used H.264/AVC standard at a cost of much higher complexity.
Minhao Tang, Xinyao Chen, Jiangtao Wen, Yuxing Han   +3 more
semanticscholar   +1 more source