基于分块分形编码的多姿态、表情人脸图像检索

利用图像分形编码中定义域块和最小均方误差一一对应的特点，提出了1种基于分形编码的多姿态、表情的人脸图像检索方法。该方法将待检索图像分割为相同大小的值域块，然后将每一值域块按给定的定义域块进行分形编码，得到最小均方误差，计算该最小均方误差与图像库中最小均方误差的欧氏距离。将待检索图像所有值域块的欧氏距离求平均，此平均欧氏距离较小的几幅图像即为检索出的图像。实验证明该方法能够准确地检索出图像库中存储的同一人的不同姿态、表情的图像。     

A Numerical Study on the Structure and Dynamics of Turbulence in Oscillatory Bottom Layer Flow over A Flat or Rippled Bed

1 .IntroductionUnder the influence of surface waves ,sandripples often appear on beaches . Whenthe amplitudeof water oscillationis sufficientlylarge ,vortices are formed onthe lee of every sand ripple crest . A-mongthese vortices ,the most important are t…     

HCS系统中海岸线的智能综合

本文提出的海岸线综合方案,涉及的技术包括:有序海岸线数据的提取、最小栅格方法确定综合范围、矢量计算方法完成对小凹陷的删除、对点一点冲突的查寻和移位处理、对点一线冲突及小范围内交叉现象的查寻和移位处理、对尖端现象的查寻和改进以及曲线矢量数据压缩方法。文章结尾给出了数据分析及试验图。     

验潮井的褒贬之说

验潮井的褒贬之说１引言常规的浮子式验潮仪采用一种验潮井减小海面波的影响。该验潮仪目前仍是潮汐测量的主要仪器，在某些地区仍继续用它监测平均海平面以研究气候的变化和海平面变化的趋势。尽管如此，长期以来，验潮井一直受着它自身的内部困扰，包括非线性响应在内。...     

星载激光后向反射镜阵列的技术参数

我国的HY-2海洋二号卫星已处于研制之中，它将装备星载激光后向反射镜阵列，以便实施星载激光定轨。依据对星载激光后向反射镜阵列的研制实践，提出了完整表述星载激光后向反射镜阵列技术参数的建议。     

波浪作用下海床的有效应力分析

波浪作用下海床的稳定性分析是海洋工程地质评价的重要内容。海床的稳定性可通过计算分析其随时间变化的有效应力场来评估。本文建议了一个周期荷载作用下土体的本构模型 ,并用于计算波浪作用下海床的应力与变形。采用Biot固结理论和有限单元法 ,分析了海床的动态应力场与孔隙水压力场。波浪作用下两种渗透系数时有效应力的动态变化过程结果对比 ,反映了渗透消散作用对海床有效应力变化的影响     

GMS低分辨模拟云图与高分辨展宽数字云图之间的关系

文章介绍了低分辨的数字云图与原始的展宽云图数据的关系，从而直接从量化后低分辨云图上求取辐射物理量。     

Parabolic Wave Propagation Modelling in Orthogonal Coordinate Systems

This paper presents a numerical model study of the propagation of water waves using the parabolic approximation of the mild-slope equation in the orthogonal coordinate system. Two types of coordinate systems are studied: (a) a general form of orthogonal coordinate system and (b) the conformal system, a special form of orthogonal coordinate system. Two typical examples, namely, expanded breakwaters and a circular channel, are studied to validate the model. First, the examples are studied by use of the general orthogonal coordinates. Then the same examples are computed by use of the confonnal system. The computational results show that the confonnal coordinate system generally gives better predictions than the general orthogonal system. A numerical technique for generating the conformal grid is combined with the numerical model to improve the practicability of the model. The comparison between the result from the numerical grid system and that from the analytical grid system shows that reliable computational results can be obtained by use of the numerical confonnal grid system.