高效匹配对选择和影像特征匹配直接决定无人机影像运动恢复结构(structure from motion,SfM)的效率。联合词汇树的倒排和正向索引结构,提出无人机影像匹配对选择和特征匹配加速算法。首先,利用词汇树的单词-影像倒排索引结构,基于影像...高效匹配对选择和影像特征匹配直接决定无人机影像运动恢复结构(structure from motion,SfM)的效率。联合词汇树的倒排和正向索引结构,提出无人机影像匹配对选择和特征匹配加速算法。首先,利用词汇树的单词-影像倒排索引结构,基于影像相似性的空间分布特征,设计了自适应阈值的词汇树检索算法;然后,利用词汇树的影像-单词正向索引结构,将显式最近邻描述子搜索简化为词汇树单词映射,设计了词汇树引导匹配算法。4组无人机影像的试验结果表明,所提的自适应阈值词汇树检索算法能够有效地筛选匹配对,避免传统固定阈值或比例算法导致的匹配对数量过多或不足的问题;在保证匹配精度的前提下,词汇树引导匹配算法的加速比达到156~228,并在无人机影像SfM空三中取得与经典最近邻搜索匹配相当的精度。展开更多
General characteristics of Globicornis Latreille and a key of known subgenera of the genus are given. The new species G.(Globicornis) yushuensis sp. nov. from China(Qinghai Province) is described and illustrated.
One new species,Uenostrongylium scaber Yuan Ren sp.nov.(China,Zhejiang),is described.Habitus and illustrations are provided,and a key to the genus Uenostrongylium is also given.
文摘高效匹配对选择和影像特征匹配直接决定无人机影像运动恢复结构(structure from motion,SfM)的效率。联合词汇树的倒排和正向索引结构,提出无人机影像匹配对选择和特征匹配加速算法。首先,利用词汇树的单词-影像倒排索引结构,基于影像相似性的空间分布特征,设计了自适应阈值的词汇树检索算法;然后,利用词汇树的影像-单词正向索引结构,将显式最近邻描述子搜索简化为词汇树单词映射,设计了词汇树引导匹配算法。4组无人机影像的试验结果表明,所提的自适应阈值词汇树检索算法能够有效地筛选匹配对,避免传统固定阈值或比例算法导致的匹配对数量过多或不足的问题;在保证匹配精度的前提下,词汇树引导匹配算法的加速比达到156~228,并在无人机影像SfM空三中取得与经典最近邻搜索匹配相当的精度。
基金supported by the National Natural Science Foundation of China(31501886)
文摘General characteristics of Globicornis Latreille and a key of known subgenera of the genus are given. The new species G.(Globicornis) yushuensis sp. nov. from China(Qinghai Province) is described and illustrated.
基金supported by the National Natural Science Foundation of China(31501888)the Scientific Research Projects of the Shaanxi Education Department(15JK1837)the High-level University Construction Projects Funded Projects of Shaanxi Province(2012SXTS03)
文摘One new species,Uenostrongylium scaber Yuan Ren sp.nov.(China,Zhejiang),is described.Habitus and illustrations are provided,and a key to the genus Uenostrongylium is also given.