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基于几何约束与局部描述的航空影像直线匹配 被引量:1
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作者 卓广平 张俊花 《测绘通报》 CSCD 北大核心 2022年第3期60-64,共5页
针对航空影像场景复杂,干扰直线匹配的不确定因素较多的问题,本文提出了基于几何编组与局部均值标准差直线描述符(MSLD)的直线匹配算法。首先,利用直线检测器(LSD)获得影像的直线特征信息,将直线与直线间的几何特征作为约束条件进行编组... 针对航空影像场景复杂,干扰直线匹配的不确定因素较多的问题,本文提出了基于几何编组与局部均值标准差直线描述符(MSLD)的直线匹配算法。首先,利用直线检测器(LSD)获得影像的直线特征信息,将直线与直线间的几何特征作为约束条件进行编组,获得两幅航空影像的直线对;其次,运用核线约束确定候选直线对,并依次构建参考与候选直线对的支持区域,利用仿射不变性统一支持区域的大小,借助MSLD进行直线对外观的局部描述;然后,结合欧氏距离与最邻近比值计算航空影像中直线描述符间的相似性,进而确定匹配结果;最后,结合共线约束完成对匹配结果的检核,获取精确的同名直线。试验选择不同场景类型变换下的航空影像数据,结果证明了本文算法可以较好地应对航空影像直线匹配效果不佳的现象。 展开更多
关键词 几何编组 直线对 核线约束 MSLD 仿射变换
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A Geometric Model of Multiaxial Warp-knitted Preform for Composite Reinforcement 被引量:1
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作者 周荣星 李炜 +1 位作者 陈南梁 冯勋伟 《Journal of Donghua University(English Edition)》 EI CAS 2003年第1期8-14,共7页
A new geometric model of Multiaxial Warp-Knitted (MWK) performs, which is based on the experimental observations and analysis of basic stitch, is developed to relate the geometric parameters and process variables. The... A new geometric model of Multiaxial Warp-Knitted (MWK) performs, which is based on the experimental observations and analysis of basic stitch, is developed to relate the geometric parameters and process variables. The fiber volume fraction and fibre orientation of MWK reinforced composites are described in terms of structural and processing parameters in the model. And this model provides a basis for the prediction of mechanical behavior of the MWK reinforced composites. 展开更多
关键词 Multiaxial Warp-Knitted (MWK) preforms geometric model basic stitch double loop pillar stitch.
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Codes From Strongly Regular (α,β)-reguli
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作者 李秀丽 《Journal of Shanghai Jiaotong university(Science)》 EI 2008年第4期491-494,共4页
Strongly regular (α,β)-reguli are a class of incidence structures with given conditions which were introduced by Hamilton and Mathon. We introduce two classes of codes constructed from strongly regular (α,β)-regul... Strongly regular (α,β)-reguli are a class of incidence structures with given conditions which were introduced by Hamilton and Mathon. We introduce two classes of codes constructed from strongly regular (α,β)-reguli within PG(k-1,q). The codes are related with two-weight codes intimately. 展开更多
关键词 two-weight codes strongly regular (α β)-reguli
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