针对图像匹配中SURF(speed up robust features)算法匹配效率不佳,以及RANSAC算法迭代次数不稳定和人为设置内点离散阈值所带来误差的问题,提出了一种结合改进的边缘化采样一致性算法和改进SURF的图像匹配方法。首先对输入图像进行快速...针对图像匹配中SURF(speed up robust features)算法匹配效率不佳,以及RANSAC算法迭代次数不稳定和人为设置内点离散阈值所带来误差的问题,提出了一种结合改进的边缘化采样一致性算法和改进SURF的图像匹配方法。首先对输入图像进行快速引导滤波预处理,过滤图像噪声并保留边缘细节信息。然后通过BEBLID(Boosted Efficient Binary Local Image Descriptor)算法为SURF构建高效的二值描述符,结合改进的边缘化采样一致性算法边缘化外点去除误匹配。经实验对比,该方法相较于SURF准确性更高,实时性有较大提升,可满足多数复杂环境下的图像匹配。展开更多
This paper presents a review on the rock associations, geochemistry, and spatial distribution of Mesozoic-Paleogene igneous rocks in Northeast Asia. The record of magmatism is used to evaluate the spatial-temporal ext...This paper presents a review on the rock associations, geochemistry, and spatial distribution of Mesozoic-Paleogene igneous rocks in Northeast Asia. The record of magmatism is used to evaluate the spatial-temporal extent and influence of multiple tectonic regimes during the Mesozoic, as well as the onset and history of Paleo-Pacific slab subduction beneath Eurasian continent. Mesozoic-Paleogene magmatism at the continental margin of Northeast Asia can be subdivided into nine stages that took place in the Early-Middle Triassic, Late Triassic, Early Jurassic, Middle Jurassic, Late Jurassic, early Early Cretaceous, late Early Cretaceous, Late Cretaceous, and Paleogene, respectively. The Triassic magmatism is mainly composed of adakitic rocks,bimodal rocks, alkaline igneous rocks, and A-type granites and rhyolites that formed in syn-collisional to post-collisional extensional settings related to the final closure of the Paleo-Asian Ocean. However, Triassic calc-alkaline igneous rocks in the Erguna-Xing'an massifs were associated with the southward subduction of the Mongol-Okhotsk oceanic slab. A passive continental margin setting existed in Northeast Asia during the Triassic. Early Jurassic calc-alkaline igneous rocks have a geochemical affinity to arc-like magmatism, whereas coeval intracontinental magmatism is composed of bimodal igneous rocks and A-type granites. Spatial variations in the potassium contents of Early Jurassic igneous rocks from the continental margin to intracontinental region, together with the presence of an Early Jurassic accretionary complex, reveal that the onset of the PaleoPacific slab subduction beneath Eurasian continent occurred in the Early Jurassic. Middle Jurassic to early Early Cretaceous magmatism did not take place at the continental margin of Northeast Asia. This observation, combined with the occurrence of low-altitude biological assemblages and the age population of detrital zircons in an Early Cretaceous accretionary complex,indicates that a strike-slip tectonic regime existed b展开更多
文摘针对图像匹配中SURF(speed up robust features)算法匹配效率不佳,以及RANSAC算法迭代次数不稳定和人为设置内点离散阈值所带来误差的问题,提出了一种结合改进的边缘化采样一致性算法和改进SURF的图像匹配方法。首先对输入图像进行快速引导滤波预处理,过滤图像噪声并保留边缘细节信息。然后通过BEBLID(Boosted Efficient Binary Local Image Descriptor)算法为SURF构建高效的二值描述符,结合改进的边缘化采样一致性算法边缘化外点去除误匹配。经实验对比,该方法相较于SURF准确性更高,实时性有较大提升,可满足多数复杂环境下的图像匹配。
基金supported by the National Natural Science Foundation of China (Grant Nos. 41330206 & 41702051)the National Key Research and Development Project (Grant No. 2016YFC0600403)the China Postdoctoral Science Foundation (Grant Nos. 2017T100204 & 2017M611314)
文摘This paper presents a review on the rock associations, geochemistry, and spatial distribution of Mesozoic-Paleogene igneous rocks in Northeast Asia. The record of magmatism is used to evaluate the spatial-temporal extent and influence of multiple tectonic regimes during the Mesozoic, as well as the onset and history of Paleo-Pacific slab subduction beneath Eurasian continent. Mesozoic-Paleogene magmatism at the continental margin of Northeast Asia can be subdivided into nine stages that took place in the Early-Middle Triassic, Late Triassic, Early Jurassic, Middle Jurassic, Late Jurassic, early Early Cretaceous, late Early Cretaceous, Late Cretaceous, and Paleogene, respectively. The Triassic magmatism is mainly composed of adakitic rocks,bimodal rocks, alkaline igneous rocks, and A-type granites and rhyolites that formed in syn-collisional to post-collisional extensional settings related to the final closure of the Paleo-Asian Ocean. However, Triassic calc-alkaline igneous rocks in the Erguna-Xing'an massifs were associated with the southward subduction of the Mongol-Okhotsk oceanic slab. A passive continental margin setting existed in Northeast Asia during the Triassic. Early Jurassic calc-alkaline igneous rocks have a geochemical affinity to arc-like magmatism, whereas coeval intracontinental magmatism is composed of bimodal igneous rocks and A-type granites. Spatial variations in the potassium contents of Early Jurassic igneous rocks from the continental margin to intracontinental region, together with the presence of an Early Jurassic accretionary complex, reveal that the onset of the PaleoPacific slab subduction beneath Eurasian continent occurred in the Early Jurassic. Middle Jurassic to early Early Cretaceous magmatism did not take place at the continental margin of Northeast Asia. This observation, combined with the occurrence of low-altitude biological assemblages and the age population of detrital zircons in an Early Cretaceous accretionary complex,indicates that a strike-slip tectonic regime existed b
