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数码摄影 2008年第10期 142-143页

作者：梁灿 iel

通过光影魔术手,可以在一两步内轻易实现数码照片后期处理的一些特殊效果,这也是该软件受到广大初学者欢迎的主要原因。本期软件一招鲜栏目中,将以5种典型的处理特效为实例,来介绍这款软件简便易学的神奇功能。免费下载地址:***

关键词：光影魔术手软件招鲜黑白照片柔光镜数码照片正片负冲后期处理

Torsion Fields Generated by the Quantum Effects of Macro-bodies

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Research in Astronomy and Astrophysics 2022年第12期22卷 335-343页

作者： da-Ming Chen National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China

We generalize Einstein's General Relativity(GR)by assuming that all matter(including macro-objects)has quantum effects.An appropriate theory to fulfill this task is Gauge Theory Gravity(GTG)developed by the Cambridge group.GTG is a“spin-torsion”theory,according to which,gravitational effects are described by a pair of gauge fields defined over a flat Minkowski background spacetime.The matter content is completely described by the Dirac spinor field,and the quantum effects of matter are identified as the spin tensor derived from the spinor field.The existence of the spin of matter results in the torsion field defined over spacetime.Torsion field plays the role of Bohmian quantum potential which turns out to be a kind of repulsive force as opposed to the gravitational potential which is attractive.The equivalence principle remains and essential in this theory so that GR is relegated to a locally approximate theory wherein the quantum effects(torsion)are negligible.As a toy model,we assume that the macro matter content can be described by the covariant Dirac equation and apply this theory to the simplest radially symmetric and static gravitational systems.Consequently,by virtue of the cosmological principle,we are led to a static universe model in which the Hubble redshifts arise from the torsion fields.

关键词： cosmology:theory (cosmology:)dark matter (cosmology:)dark energy

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The Dynamics of Vector Fields with Singularities

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Acta Mathematica Sinica,English Series 2022年第1期38卷 225-248页

作者： da Wei YANG School of Mathematical Sciences Soochow UniversitySuzhou 215006P.R.China

We give a brief survey on the dynamics of vector fields with singularities.The aim of this survey is not to list all results in this field,but only to introduce some results from several viewpoints and some technics.

关键词： Vector filed singularity Morse–Smale horseshoe singular hyperbolicty

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Three-dimensional face point cloud hole-filling algorithm based on binocular stereo matching and a B-spline

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Frontiers of Information Technology & Electronic Engineering 2022年第3期23卷 398-408页

作者： Yuan HUANG Feipeng da School of Automation Southeast UniversityXznjing 210096China Shenzhen Research Institute of Southeast University Shenzhen 518000China

When obtaining three-dimensional(3D)face point cloud data based on structured light,factors related to the environment,occlusion,and illumination intensity lead to holes in the collected data,which affect subsequent recognition.In this study,we propose a hole-filling method based on stereo-matching technology combined with a B-spline.The algorithm uses phase information acquired during raster projection to locate holes in the point cloud,simultaneously extracting boundary point cloud sets.By registering the face point cloud data using the stereo-matching algorithm and the data collected using the raster projection method,some supplementary information points can be obtained at the holes.The shape of the B-spline curve can then be roughly described by a few key points,and the control points are put into the hole area as key points for iterative calculation of surface reconstruction.Simulations using smooth ceramic cups and human face models showed that our model can accurately reproduce details and accurately restore complex shapes on the test surfaces.Simulation results indicated the robustness of the method,which is able to fill holes on complex areas such as the inner side of the nose without a prior model.This approach also effectively supplements the hole information,and the patched point cloud is closer to the original data.This method could be used across a wide range of applications requiring accurate facial recognition.

关键词： Three-dimensional(3D)point cloud Hole filling Stereo matching B-spline

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