Results 251 to 260 of about 17,625 (278)

Complex pupil retrieval with undersampled data

Journal of the Optical Society of America A, 2009
The ability to retrieve the complex-valued, generalized pupil function of an imaging system from undersampled measurements of the defocused system point spread function (PSF) is examined through numerical simulations. The ability to do so degrades as the detector pixel pitch increases when using a fixed number of PSF measurements.
Samuel T, Thurman, James R, Fienup
openaire   +2 more sources

Motion sensitivity and spatial undersampling in amblyopia

Vision Research, 1993
The nature of the visual deficit in human amblyopia has been keenly sought over the last decade. Some confusion has arisen as to whether the motion-sensitive mechanisms known to exist in normal vision are selectively affected in humans with amblyopia.
R F, Hess, S J, Anderson
openaire   +2 more sources

Reconstruction Algorithms in Undersampled AFM Imaging

IEEE Journal of Selected Topics in Signal Processing, 2016
This paper provides a study of spatial undersampling in atomic force microscopy (AFM) imaging followed by different image reconstruction techniques based on sparse approximation as well as interpolation. The main reasons for using undersampling is that it reduces the path length and thereby the scanning time as well as the amount of interaction between
Thomas Arildsen, Christian Schou Oxvig, Patrick Steffen Pedersen, Jan Østergaard, Torben Larsen   +4 more
openaire   +1 more source

Gabor transform with undersampling

Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96), 2002
We investigate discrete Gabor transforms with undersampling. For an undersampled Gabor triple (g,a,b) (i.e.,a.b>N), we show that the associated generalized dual Gabor wavelet is the same as the one associated to (g,b/spl tilde/,a/spl tilde/), except for the redundancy constant factor.
openaire   +1 more source

Analog DFT using an undersampling technique

IEEE Design & Test of Computers, 1999
This article presents a novel approach to analog design for test (DFT). The approach is based on wideband undersampling techniques using multiple samplers on-chip. Using this technique, signals being tested can be mixed down to lower frequencies before being brought off-chip.
Ralph Mason, Shing Ma
openaire   +1 more source

Optimization of multisine excitations for receiver undersampling

2010 IEEE International Conference on Acoustics, Speech and Signal Processing, 2010
An algorithm for optimizing the frequency distribution of an arbitrary multisine signal is presented to reduce the power consumption and computational complexity of a multisine receiver. By careful selection or adjustment of each frequency component in the applied multisine signal, undersampling and frequency aliasing in the receiver can be used to ...
Michael J. Schmitz, Roger A. Green
openaire   +1 more source

Radial-based undersampling approach with adaptive undersampling ratio determination

Neurocomputing, 2023
Bo Sun, Qian Zhou, Zhijun Wang, Peng Lan, Yunsheng Song, Shaomin Mu, Aifeng Li, Haiyan Chen 0001, Peng Liu   +8 more
openaire   +1 more source

A novel progressively undersampling method based on the density peaks sequence for imbalanced data

Knowledge-Based Systems, 2021
Huawen Liu, Shouzhen Zeng
exaly  

Relevant information undersampling to support imbalanced data classification

Neurocomputing, 2021
G Castellanos-Domínguez
exaly  

UFFDFR: Undersampling framework with denoising, fuzzy c-means clustering, and representative sample selection for imbalanced data classification

Information Sciences, 2021
Ming Zheng, Tong Li, Xiaoyao Zheng
exaly