Results 31 to 40 of about 60,050 (165)

Image distortion correction method based on geometric features

Dianzi Jishu Yingyong
To solve the difficulties of complex operation in traditional distortion correction, a geometric feature-based distortion correction method is proposed.
Huang Lida, Wu Linhuang
doaj   +1 more source

Distortion coefficients for crypto-unitary operators

Linear Algebra and its Applications, 1978
AbstractFor a linear operator T on complex Hilbert space H, we define M (T) as the least number such that T may be made a contraction by changing to a new norm |·|, derived from an inner product, such that for all h ∈ H ‖h‖⩽|h|⩽M(T)‖h‖.We define K (T) as the least number such that ‖p(T)‖⩽K(T) for all polynomials p mapping the complex unit disk into ...
openaire   +1 more source

VVC coded distortion prediction model based on frame-level transform coefficient modeling of generalized Gaussian distribution

Dianxin kexue, 2023
In versatile video coding (VVC), a variety of advanced coding tools work together to achieve excellent coding performance.Compared with high efficient video coding (HEVC), the transform coefficient distribution (TCD) of VVC has sharper peaks.In order to ...
Yiyin GU, Hongkui WANG, Haibin YIN
doaj   +2 more sources

Improved geometric accuracy of whole body diffusion-weighted imaging at 1.5T and 3T using reverse polarity gradients

Scientific Reports, 2022
Whole body diffusion-weighted imaging (WB-DWI) is increasingly used in oncological applications, but suffers from misalignments due to susceptibility-induced geometric distortion.
T. Sjöholm, J. Kullberg, R. Strand, M. Engström, H. Ahlström, F. Malmberg   +5 more
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Comparative Study on the Performance of S-Shaped Diffuser With Shorten Length

MATEC Web of Conferences, 2018
This study presents numerical investigation on the performance of S-shaped air intake normal and aggressive diffuser with 22% length reduction. Both models have same area ratio of 3.1 with different total length, turning angle and radius of curvature ...
Jessam Raed A., Al-Kayiem Hussain H., Nasif Mohammad S.   +2 more
doaj   +1 more source

Beltrami coefficient and angular distortion of discrete geometric mappings

CoRR
Over the past several decades, geometric mapping methods have been extensively developed and utilized for many practical problems in science and engineering. To assess the quality of geometric mappings, one common consideration is their conformality. In particular, it is well-known that conformal mappings preserve angles and hence the local geometry ...
Zhiyuan Lyu, Gary P. T. Choi
openaire   +2 more sources

Low Complexity Quantization in High Efficiency Video Coding

IEEE Access, 2020
The rate-distortion optimized quantization (RDOQ) provides an excellent trade-off between rate and distortion in High Efficiency Video Coding (HEVC), leading to inspiring improvement in terms of rate-distortion performance. However, its heavy use imposes
Meng Wang, Xiaohan Fang, Songchao Tan, Xinfeng Zhang, Li Zhang   +4 more
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Nonlinear distortion compensation algorithm aided by channel estimation of memoryless power amplifier for OTFS receiver

Tongxin xuebao, 2022
A compensation algorithm for OTFS receiver was proposed to solve the problem of transmission signal distortion caused by the nonlinear characteristics of power amplifier (PA) in the orthogonal time frequency space (OTFS) system.The channel state ...
Zhanjun JIANG, Huan LIU, Huawei ZHANG, Cuiran LI   +3 more
doaj   +2 more sources

Some Bazilevič functions of order beta

International Journal of Mathematics and Mathematical Sciences, 1991
Distortion theorems and coefficient estimates are obtained for a new class of Bazilevič functions.
S. A. Halim
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Statistical anisotropy in CMB spectral distortions

Physics Letters B, 2019
Measurements of the cosmic microwave background (CMB) spectral y-distortion anisotropy offer a test for the statistical isotropy of the primordial density perturbations on 0.01≲kMpc≲1.
Atsuhisa Ota
doaj   +1 more source