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Adaptive subtraction with 3D U-net and 3D data windows to suppress seismic multiples
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作者 Jin-Qiang Huang Li-Yun Fu +3 位作者 Jia-Hui Ma Xing-Zhong Du Zhong-Xiao Li Ke-Yi Sun 《Petroleum Science》 2025年第3期1125-1139,共15页
The deep convolutional neural network U-net has been introduced into adaptive subtraction, which is a critical step in effectively suppressing seismic multiples. The U-net approach has higher precision than the tradit... The deep convolutional neural network U-net has been introduced into adaptive subtraction, which is a critical step in effectively suppressing seismic multiples. The U-net approach has higher precision than the traditional linear regression approach. However, the existing 2D U-net approach with 2D data windows can not deal with elaborate discrepancies between the actual and simulated multiples along the gather direction. It may lead to erroneous preservation of primaries or generate obvious vestigial multiples, especially in complex media. To further enhance the multiple suppression accuracy, we present an adaptive subtraction approach utilizing 3D U-net architecture, which can adaptively separate primaries and multiples utilizing 3D windows. The utilization of 3D windows allows for enhanced depiction of spatial continuity and anisotropy of seismic events along the gather direction in comparison to 2D windows. The 3D U-net approach with 3D windows can more effectively preserve the continuity of primaries and manage the complex disparities between the actual and simulated multiples. The proposed 3D U-net approach exhibits 1 dB improvement in the signal-to-noise ratio compared to the 2D U-net approach, as observed in the synthesis data section, and exhibits more outstanding performance in the preservation of primaries and removal of residual multiples in both synthesis and reality data sections. Moreover, to expedite network training in our proposed 3D U-net approach we employ the transfer learning (TL) strategy by utilizing the network parameters of 3D U-net estimated in the preceding data segment as the initial network parameters of 3D U-net for the subsequent data segment. In the reality data section, the 3D U-net approach incorporating TL reduces the computational expense by 70% compared to the one without TL. 展开更多
关键词 Adaptive subtraction 3d U-net 3d data windows Transfer learning Multiple suppression
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A Semantic-Sensitive Approach to Indoor and Outdoor 3D Data Organization
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作者 Youchen Wei 《Journal of World Architecture》 2024年第1期1-6,共6页
Building model data organization is often programmed to solve a specific problem,resulting in the inability to organize indoor and outdoor 3D scenes in an integrated manner.In this paper,existing building spatial data... Building model data organization is often programmed to solve a specific problem,resulting in the inability to organize indoor and outdoor 3D scenes in an integrated manner.In this paper,existing building spatial data models are studied,and the characteristics of building information modeling standards(IFC),city geographic modeling language(CityGML),indoor modeling language(IndoorGML),and other models are compared and analyzed.CityGML and IndoorGML models face challenges in satisfying diverse application scenarios and requirements due to limitations in their expression capabilities.It is proposed to combine the semantic information of the model objects to effectively partition and organize the indoor and outdoor spatial 3D model data and to construct the indoor and outdoor data organization mechanism of“chunk-layer-subobject-entrances-area-detail object.”This method is verified by proposing a 3D data organization method for indoor and outdoor space and constructing a 3D visualization system based on it. 展开更多
关键词 Integrated data organization Indoor and outdoor 3d data models Semantic models Spatial segmentation
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Experimental Evaluation of the Performance of Local Shape Descriptors for the Classification of 3D Data in Precision Farming
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作者 Jennifer Mack Anatina Trakowski +3 位作者 Florian Rist Katja Herzog Reinhard Topfer Volker Steinhage 《Journal of Computer and Communications》 2017年第12期1-12,共12页
Object classification in high-density 3D point clouds with applications in precision farming is a very challenging area due to high intra-class variances and high degrees of occlusions and overlaps due to self-similar... Object classification in high-density 3D point clouds with applications in precision farming is a very challenging area due to high intra-class variances and high degrees of occlusions and overlaps due to self-similarities and densely packed plant organs, especially in ripe growing stages. Due to these application specific challenges, this contribution gives an experimental evaluation of the performance of local shape descriptors (namely Point-Feature Histogram (PFH), Fast-Point-Feature Histogram (FPFH), Signature of Histograms of Orientations (SHOT), Rotational Projection Statistics (RoPS) and Spin Images) in the classification of 3D points into different types of plant organs. We achieve very good results on four representative scans of a leave, a grape bunch, a grape branch and a flower of between 94 and 99% accuracy in the case of supervised classification with an SVM and between 88 and 96% accuracy using a k-means clustering approach. Additionally, different distance measures and the influence of the number of cluster centres are examined. 展开更多
关键词 Descriptor Performance Precision Farming 3d data
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Constructing Isosurfaces from 3D Data Sets Taking Account of Depth Sorting of Polyhedra
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作者 周勇 唐泽圣 《Journal of Computer Science & Technology》 SCIE EI CSCD 1994年第2期117-127,共11页
Creating and rendering intermediate geometric primitives is one of the approaches to visualize data sets in 3D space. Some algorithms have been developed to construct isosurface from uniformly distributed 3D data sets... Creating and rendering intermediate geometric primitives is one of the approaches to visualize data sets in 3D space. Some algorithms have been developed to construct isosurface from uniformly distributed 3D data sets. These algorithms assume that the function value varies linearly along edges of each cell. But to irregular 3D data sets, this assumption is inapplicable. Moreover, the depth sorting of cells is more complicated for irregular data sets, which is indispensable for generating isosurface images or semitransparent isosurface images, if Z-buffer method is not adopted.In this paper, isosurface models based on the assumption that the function value has nonlinear distribution within a tetrahedroll are proposed. The depth sorting algorithm and data structures are developed for the irregular data sets in which cells may be subdivided into tetrahedra. The implementation issues of this algorithm are discussed and experimental results are shown to illustrate potentials of this technique. 展开更多
关键词 ISOSURFACE 3d data sets depth sorting POLYHEDRA
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基于3D Slicer软件的TI-RADS 4类甲状腺结节术前诊断模型构建与验证研究
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作者 余文兵 严谨 +1 位作者 王瑞丰 唐益江 《中国现代药物应用》 2026年第1期54-57,共4页
目的旨在利用3D Slicer软件对甲状腺影像报告与数据系统(TI-RADS)4类甲状腺结节进行三维重建和影像组学特征提取,构建术前诊断模型,以提高甲状腺结节良恶性鉴别的准确性,为临床决策提供可靠依据。方法本研究为回顾性研究,收集经过超声... 目的旨在利用3D Slicer软件对甲状腺影像报告与数据系统(TI-RADS)4类甲状腺结节进行三维重建和影像组学特征提取,构建术前诊断模型,以提高甲状腺结节良恶性鉴别的准确性,为临床决策提供可靠依据。方法本研究为回顾性研究,收集经过超声检查诊断为TI-RADS 4类甲状腺结节并具有明确病理结果的344例患者的临床资料。通过CT影像数据,使用3D Slicer软件进行三维重建,提取影像组学特征,并结合机器学习方法构建诊断模型。利用受试者工作特征曲线(ROC)对模型性能进行评估,计算其曲线下面积(AUC),评估模型的预测效能。结果344例TI-RADS 4类甲状腺结节患者,其中恶性结节患者192例(55.81%),良性结节患者152例(44.19%)。良恶性结节患者性别分布上差异无统计学意义(P>0.05),但良恶性结节患者年龄、结节大小、促甲状腺激素(TSH)水平存在显著性差异(P<0.05)。恶性结节的体积显著大于良性结节,边界清晰度评分、密度不均匀性、表面粗糙度评分、CT值均显著高于良性结节,存在显著性差异(P<0.05)。纵横比>1[OR=2.563,95%CI=(1.090,6.025)]、实性成分[OR=1.856,95%CI=(1.077,3.199)]、低回声和极低回声[OR=3.326,95%CI=(1.188,9.314)]、边缘模糊[OR=3.968,95%CI=(1.274,12.353)]及环状钙化或微小钙化[OR=3.425,95%CI=(1.264,9.281)]均为甲状腺结节良恶性鉴别的独立预测因子(P<0.05)。依据多因素分析结果,构建了甲状腺结节良恶性鉴别的预测模型。ROC分析结果显示,纵横比>1、低回声和极低回声、实性成分、边缘模糊、环状钙化或微小钙化及以上预测模型的P值用于甲状腺结节良恶性鉴别诊断的AUC分别为0.723、0.756、0.798、0.812、0.845和0.932。结论结合3D Slicer软件进行三维重建和影像组学特征提取,结合机器学习技术,能够显著提高TI-RADS 4类甲状腺结节的术前诊断准确性,为临床鉴别诊断良恶性结节提供了更为可靠的决策支持。 展开更多
关键词 3d Slicer软件 甲状腺影像报告与数据系统4类 甲状腺结节 术前诊断 模型构建 影像组学 三维重建 机器学习
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Automated Rock Detection and Shape Analysis from Mars Rover Imagery and 3D Point Cloud Data 被引量:10
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作者 邸凯昌 岳宗玉 +1 位作者 刘召芹 王树良 《Journal of Earth Science》 SCIE CAS CSCD 2013年第1期125-135,共11页
A new object-oriented method has been developed for the extraction of Mars rocks from Mars rover data. It is based on a combination of Mars rover imagery and 3D point cloud data. First, Navcam or Pancam images taken b... A new object-oriented method has been developed for the extraction of Mars rocks from Mars rover data. It is based on a combination of Mars rover imagery and 3D point cloud data. First, Navcam or Pancam images taken by the Mars rovers are segmented into homogeneous objects with a mean-shift algorithm. Then, the objects in the segmented images are classified into small rock candidates, rock shadows, and large objects. Rock shadows and large objects are considered as the regions within which large rocks may exist. In these regions, large rock candidates are extracted through ground-plane fitting with the 3D point cloud data. Small and large rock candidates are combined and postprocessed to obtain the final rock extraction results. The shape properties of the rocks (angularity, circularity, width, height, and width-height ratio) have been calculated for subsequent ~eological studies. 展开更多
关键词 Mars rover rock extraction rover image 3d point cloud data.
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基于可跨层重构LFSR的3D-SIC内建自测试方案
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作者 陈田 罗蓓蓓 +1 位作者 刘军 鲁迎春 《微电子学与计算机》 2025年第3期100-109,共10页
针对三维堆叠集成电路(Three-Dimensional Stacked Integrated Circuits,3D-SIC)中测试面积开销和测试数据存储量大的问题,对于n层3D-SIC,提出了一种基于可跨层重构线性反馈移位寄存器(Cross-Layer Reconfigurable Linear Feedback Shif... 针对三维堆叠集成电路(Three-Dimensional Stacked Integrated Circuits,3D-SIC)中测试面积开销和测试数据存储量大的问题,对于n层3D-SIC,提出了一种基于可跨层重构线性反馈移位寄存器(Cross-Layer Reconfigurable Linear Feedback Shift Register,CLR-LFSR)的内建自测试(Built-In Self-Test,BIST)结构。在键合中和键合后测试阶段,可以任意组合键合前测试阶段中的LFSR,连接构成级数更大的LFSR结构,以提高包含确定位更多的测试向量的编码成功率。同时,还提出了一种设置阈值的相容压缩和最优分级重播种结合的测试数据压缩方法。通过在测试向量图着色相容时设置相容阈值,然后将相容后的测试向量按照包含的确定位个数分成2^(n)−1组,重播种生成长度不定的种子集,从而减少了测试数据存储量。在ISCAS'89电路上的实验结果表明,相对于不可重构的BIST方法,方案能够减少三维芯片43.8%的面积开销,测试数据存储量减少98.52%。 展开更多
关键词 可跨层重构LFSR BIST 测试数据压缩 3d-SIC测试
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Beamforming with the Generalized Sidelobe Cancellerfor Coherent Noise Attenuation in 3D Seismic Data 被引量:1
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作者 HongFei HuTianyue 《Applied Geophysics》 SCIE CSCD 2004年第1期14-19,共6页
This paper presents a new approach for attenuating coherent noise in 3D seismic data. An adaptive beamforming with generalized sidelobe canceller (GSC) design methodology is utilized here as a general form of linearly... This paper presents a new approach for attenuating coherent noise in 3D seismic data. An adaptive beamforming with generalized sidelobe canceller (GSC) design methodology is utilized here as a general form of linearly constrained adaptive beamforming structure. It consists of a fixed beamformer, and a signal-blocking matrix in front of an unconstrained adaptive beamformer.Considerationf of the complexity of the geometry for 3D seismic survey, the 3D beamforming with GSC technique is developed with two key points: (1) sorting along azimuth sections to simplify the relationship between traveltime and offset from 3D to 2D, and (2) dynamic binning scheme to avoid the possible poor folding in some azimuth sections. Both simulation result and real data example show that the newly developed 3D beamforming with GSC yields more credible results at a relative low cost, sufficient stability and good resolution. 展开更多
关键词 BEAMFORMING sidelobe canceller coherent noise and 3d seismic data
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Application of 9-component S-wave 3D seismic data to study sedimentary facies and reservoirs in a biogasbearing area:A case study on the Pleistocene Qigequan Formation in Taidong area,Sanhu Depression,Qaidam Basin,NW China 被引量:1
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作者 XU Zhaohui LI Jiangtao +4 位作者 LI Jian CHEN Yan YANG Shaoyong WANG Yongsheng SHAO Zeyu 《Petroleum Exploration and Development》 SCIE 2024年第3期647-660,共14页
To solve the problems in restoring sedimentary facies and predicting reservoirs in loose gas-bearing sediment,based on seismic sedimentologic analysis of the first 9-component S-wave 3D seismic dataset of China,a four... To solve the problems in restoring sedimentary facies and predicting reservoirs in loose gas-bearing sediment,based on seismic sedimentologic analysis of the first 9-component S-wave 3D seismic dataset of China,a fourth-order isochronous stratigraphic framework was set up and then sedimentary facies and reservoirs in the Pleistocene Qigequan Formation in Taidong area of Qaidam Basin were studied by seismic geomorphology and seismic lithology.The study method and thought are as following.Firstly,techniques of phase rotation,frequency decomposition and fusion,and stratal slicing were applied to the 9-component S-wave seismic data to restore sedimentary facies of major marker beds based on sedimentary models reflected by satellite images.Then,techniques of seismic attribute extraction,principal component analysis,and random fitting were applied to calculate the reservoir thickness and physical parameters of a key sandbody,and the results are satisfactory and confirmed by blind testing wells.Study results reveal that the dominant sedimentary facies in the Qigequan Formation within the study area are delta front and shallow lake.The RGB fused slices indicate that there are two cycles with three sets of underwater distributary channel systems in one period.Among them,sandstones in the distributary channels of middle-low Qigequan Formation are thick and broad with superior physical properties,which are favorable reservoirs.The reservoir permeability is also affected by diagenesis.Distributary channel sandstone reservoirs extend further to the west of Sebei-1 gas field,which provides a basis to expand exploration to the western peripheral area. 展开更多
关键词 9-component S-wave 3d seismic data seismic sedimentology biogas sedimentary facies reservoir Qaidam Basin Sanhu Depression Pleistocene Qigequan Formation
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面向视觉感知计算的古典园林景观3D数据模型设计——以苏州拙政园为例 被引量:1
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作者 张江玥 苏世亮 《地球信息科学学报》 北大核心 2025年第2期441-460,共20页
【目的】作为世界文化遗产和城市游憩空间的重要组成部分,中国古典园林文化生态系统服务的发挥主要依赖于游客与景观的视觉感知与交互。然而,如何为古典园林景观视觉感知模拟建立相应的3D数据模型仍存在以下方法挑战:如何构建视觉感知... 【目的】作为世界文化遗产和城市游憩空间的重要组成部分,中国古典园林文化生态系统服务的发挥主要依赖于游客与景观的视觉感知与交互。然而,如何为古典园林景观视觉感知模拟建立相应的3D数据模型仍存在以下方法挑战:如何构建视觉感知框架以表征中国古典园林所特有的“景”概念?如何以游客视觉感知为切入点剖析其游园观景行为?以何种形式组织古典园林景观3D数据模型,从而实现视觉感知的全流程模拟计算,并提升计算效果和效率?【方法】针对这些挑战,本文从游客视觉感知过程的“客体-路径-主体-结果”4个环节出发,以“叙事符号系统-叙事策略”的空间叙事为切入点,将古典园林景观构成剖析为“环境空间-视觉感知空间-视知觉空间”,提出了古典园林景观的视觉感知框架,并基于相关领域本体模型语义复用,将模型梳理为“地物层-行为层-分析层”3个层次,扩展并设计了面向视觉感知计算的古典园林景观3D数据模型。【结果】以苏州拙政园为例,从地物数据处理、行为数据配置、存储环境搭建,再到分析数据计算,阐述了古典园林景观3D数据模型实施应用的方法流程,以期为中国古典园林乃至其他文化遗产三维空间视觉感知研究提供理论与方法参考。 展开更多
关键词 中国古典园林 部件级实景三维 3d数据模型 空间叙事 视觉感知计算 本体语义复用 数字地图
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3D Modelling from New and Existing Gravity Data of an Intrusive Body in the Northern Part of Kribi-Campo Sub-Basin in Cameroon 被引量:4
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作者 Kue Petou Rokis Malquaire Owona Angue Marie Louise +1 位作者 Njingti Nfor Manguelle-Dicoum Eliezer 《International Journal of Geosciences》 2017年第8期984-1003,共20页
A new gravity survey was carried out in the northern part of the onshore Kribi- Campo sub-basin in Cameroon. The data were incorporated to the existing ones and then analyzed and modeled in order to elucidate the subs... A new gravity survey was carried out in the northern part of the onshore Kribi- Campo sub-basin in Cameroon. The data were incorporated to the existing ones and then analyzed and modeled in order to elucidate the subsurface structure of the area. The area is characterized in its north-western part by considerably high positive anomalies indicative of the presence of a dense intrusive body. We find, 1) from the analysis of the gravity residual anomaly map, the high positive anomalies observed are the signature of a shallow dense structure;2) from the multi-scale analysis of the maxima of the horizontal gradient, the structure is confined between depths of 0.5 km and 5 km;3) from the quantitative interpretation of residual anomalies by spectral analysis, the depth to the upper surface of the intrusive body is not uniform, the average depth of the bottom is h1 = 3.6 km and the depths to particular sections of the roof of the intrusion are h2 = 1.6 km and h3 = 0.5 km;4) and the 3D modeling gives results that are suggestive of the presence of contacts between rocks of different densities at different depths and a dense intrusive igneous body in the upper crust of the Kribi zone. From the 3D model the dense intrusive igneous block is surrounded by sedimentary formations to the south-west and metamorphic formations to the north-east. Both formations have a density of about 2.74 g/cm3. The near surface portions of this igneous block lie at a depth range of 0.5 km to 1.5 km while its lower surface has a depth range of 3.6 km to 5.2 km. The shape of the edges and the bottom of the intrusive body are suggestive of the fact that it forms part of a broader structure underlying the Kribi-Campo sub-basin with a great influence on the sedimentary cover. 展开更多
关键词 Kribi-Campo Sub-Basin GRAVITY data 3d MODELLING SPECTRAL Analysis RESIDUAL ANOMALY
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Using MC Algorithm to Implement 3D Image Reconstruction for Yunnan Weather Radar Data 被引量:2
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作者 Zhongneng Liu Zhenzhong Shi +4 位作者 Murong Jiang Jie Zhang Liqing Chen Tian Zhang Gongqin Liu 《Journal of Computer and Communications》 2017年第5期50-61,共12页
3D image reconstruction for weather radar data can not only help the weatherman to improve the forecast efficiency and accuracy, but also help people to understand the weather conditions easily and quickly. Marching C... 3D image reconstruction for weather radar data can not only help the weatherman to improve the forecast efficiency and accuracy, but also help people to understand the weather conditions easily and quickly. Marching Cubes (MC) algorithm in the surface rendering has more excellent applicability in 3D reconstruction for the slice images;it may shorten the time to find and calculate the isosurface from raw volume data, reflect the shape structure more accurately. In this paper, we discuss a method to reconstruct the 3D weather cloud image by using the proposed Cube Weighting Interpolation (CWI) and MC algorithm. Firstly, we detail the steps of CWI, apply it to project the raw radar data into the cubes and obtain the equally spaced cloud slice images, then employ MC algorithm to draw the isosurface. Some experiments show that our method has a good effect and simple operation, which may provide an intuitive and effective reference for realizing the 3D surface reconstruction and meteorological image stereo visualization. 展开更多
关键词 WEATHER RADAR data 3d Reconstruction MC Algorithm CUBE Weighting INTERPOLATION
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基于Geomagic人体下颌骨逆向曲面重构与3D打印关键技术
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作者 曾锋 熊学慧 《机械工程师》 2025年第5期157-160,164,共5页
利用光学扫描仪获取人体下颌骨的点云数据,利用Geomagic Wrap软件对人体下颌骨的点云数据进行处理和优化,利用Geomagic Design X软件完成人体下颌骨的三维曲面重构,并分析拟合曲面的精度,运用先进的快速成型技术完成人体下颌骨的制作,... 利用光学扫描仪获取人体下颌骨的点云数据,利用Geomagic Wrap软件对人体下颌骨的点云数据进行处理和优化,利用Geomagic Design X软件完成人体下颌骨的三维曲面重构,并分析拟合曲面的精度,运用先进的快速成型技术完成人体下颌骨的制作,阐述了基于Geomagic软件技术的人体下颌骨逆向曲面重构与3D打印关键技术,对人造骨骼的修复、仿制和再设计具有非常好的借鉴意义。 展开更多
关键词 点云数据处理 人体下颌骨 逆向逆向建模 3d打印
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Application of 3D Seismic Data Inversion to Coal Mining Prospecting
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作者 LIU Zhao-guo DONG Shou-hua 《Journal of China University of Mining and Technology》 EI 2005年第3期218-221,共4页
Seismic inversion is one of the most important methods for lithological prospecting . Seismic data with lowresolution is converted into impedance data of high resolution which can reflect the geological structure by i... Seismic inversion is one of the most important methods for lithological prospecting . Seismic data with lowresolution is converted into impedance data of high resolution which can reflect the geological structure by inversionThe inversion technique of 3D seismic data is discussed from both methodological and theoretical aspects, and the in-version test is also carried out using actual logging data. The result is identical with the measured data obtained fromroadway of coal mine. The field tests and research results indicate that this method can provide more accurate data foridentifying thin coal seam and minor faults. 展开更多
关键词 3d seismic data INVERSION IMPEDANCE logging data
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基于3D视觉感知的警务实战训练与评价方法研究
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作者 刘涛 史曙生 +3 位作者 刘俊峰 蒋天宇 刘凯 姚佳烽 《机械制造与自动化》 2025年第2期17-21,31,共6页
提出一种基于3D视觉动作捕捉和虚拟现实技术的警务实战训练系统以提高警察体能与技能训练的有效性。通过多模态数据融合技术实时捕捉学员运动特征,建立标准化动作特征库。采用时序对齐算法实现训练动作与标准模板的动态匹配,结合层次化... 提出一种基于3D视觉动作捕捉和虚拟现实技术的警务实战训练系统以提高警察体能与技能训练的有效性。通过多模态数据融合技术实时捕捉学员运动特征,建立标准化动作特征库。采用时序对齐算法实现训练动作与标准模板的动态匹配,结合层次化机器学习模型解析动作偏差规律。系统创新集成自适应反馈机制,通过强化学习策略动态优化指导方案,形成“评估—反馈—强化”的闭环训练模式。该技术体系显著提升警务实战训练的科学性与适应性,为实战技能智能化培养提供创新解决方案。 展开更多
关键词 3d视觉动作捕捉 虚拟现实 多模态数据融合 警务实战训练
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Study on the 3D Seismic Data Field Hybrid Rendering Technique of Natural Gas Hydrate and Its Application
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作者 Pan LI Zhaojun ZHOU Meng HUANG 《International Journal of Technology Management》 2013年第2期50-52,共3页
3D visualization technology is a tool used for displaying, describing, and understanding the characteristics of geologic bodies, and features high efficiency, objective accuracy, visual expression, etc. In this paper,... 3D visualization technology is a tool used for displaying, describing, and understanding the characteristics of geologic bodies, and features high efficiency, objective accuracy, visual expression, etc. In this paper, the man-machine interactive interpretation and 3D visualization technology rapidly displaying and analyzing the 3D seismic data of hydrate ore volume is researched and developed using the hybrid rendering technique. Through the integrated interpretation on the 3D space structure, stratum, and seismic attributes, the visualized multi-attribute superimposition analysis is implemented for describing the spatial distribution characteristics of hydrate ore volume and exquisitely describing the subtle geological characteristics of hydrate ore volume. By the hybrid rendering technique, authentication and interpretation are provided for the geological exploration work, so as to greatly enhance the visualization and accuracy of the geological analysis, and also provide a good decision-making foundation for the subsequent development of resources. 展开更多
关键词 Natural Gas Hydrate 3d Seismic data Hybrid Rendering Technique
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基于3D-CNN和融合Transformer的步态识别算法 被引量:1
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作者 李金成 代雪晶 闫睿骜 《科学技术与工程》 北大核心 2025年第17期7276-7284,共9页
当前,步态识别的主流方法常依赖堆叠卷积层来逐步扩大感受野,以融合局部特征,这种方法大多采用浅层网络,在提取步态图像的全局特征时存在一定的局限性,并缺乏对时序周期特征信息的关注。因此提出一种融合Transformer和3D卷积的深层神经... 当前,步态识别的主流方法常依赖堆叠卷积层来逐步扩大感受野,以融合局部特征,这种方法大多采用浅层网络,在提取步态图像的全局特征时存在一定的局限性,并缺乏对时序周期特征信息的关注。因此提出一种融合Transformer和3D卷积的深层神经网络算法(3D convolutional gait recognition network based on adaptFormer and spect-conv,3D-ASgaitNet)。首先,初始残差卷积层将二进制轮廓数据转换为浮点编码特征图,以提供密集的低级结构特征;在此基础上,光谱层通过频域和时域的联合处理增强特征提取能力,并使用伪3D残差卷积模块进一步提取高级时空特征;最后融合AdaptFormer模块,通过轻量级的下采样-上采样网络结构,以适应不同的数据分布和任务需求,提供灵活的特征变换能力。3D-ASgaitNet分别在4个公开的室内数据集(CASIA-B、OU-MVLP)、室外数据集(GREW、Gait3D)上进行,分别取得99.84%、87.83%、45.32%、72.12%的识别准确率。实验结果表明,所提出方法在CASIA-B、Gait3D数据集中的识别准确率接近SOTA性能。 展开更多
关键词 步态识别 融合Transformer 3d残差卷积 二进制轮廓数据
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Iteratively Weighted Least Square Inversion of 3D Seismic Data Regularization under Constraints of Local Plane Wave Model
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作者 Liu Yujin Li Zhenchun 《石油地球物理勘探》 EI CSCD 北大核心 2012年第A02期41-47,共7页
关键词 石油 地球物理勘探 地质调查 油气资源
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基于局部上下文增强的快速3D弱特征目标检测方法
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作者 张洋 孙海江 +1 位作者 张笑闻 纪勇 《液晶与显示》 北大核心 2025年第11期1675-1687,共13页
3D目标检测在自动驾驶与具身智能等领域应用广泛,但其对场景中弱特征目标(如远小或遮挡物体)存在判别性差、检测难度大的问题,为此,本文提出了一种局部上下文增强的快速3D弱特征目标检测方法。首先,为解决弱特征目标特征表达稀疏的难点... 3D目标检测在自动驾驶与具身智能等领域应用广泛,但其对场景中弱特征目标(如远小或遮挡物体)存在判别性差、检测难度大的问题,为此,本文提出了一种局部上下文增强的快速3D弱特征目标检测方法。首先,为解决弱特征目标特征表达稀疏的难点,提出了一种局部稀疏特征增强模块(Local Sparse Feature Enhancement Module,LSFE),通过自适应调整局部空间位置的特征权重增强稀疏特征的表达能力,提升模型对稀疏特征的敏感度。其次,针对弱特征目标易受背景干扰的难点,提出多尺度上下文学习模块(Multi Scale Context Learning Module,MSCL),联合空间和通道维度的注意力机制,获得多尺度的空间上下文信息,抑制背景干扰。最后,为了更好地利用目标的浅层特征,在网络检测头结构中增加了高分辨率特征层,增强弱特征目标的细节感知能力。在KITTI数据集上的实验结果表明,本文方法与基线方法相比,显著提高了弱特征目标检测精度,Pedestrian类别的mAP提高了12.78%,Cyclist类别的mAP提高了2.69%,Car类别的平均精度均值(mAP)提高了6.84%。本文方法在实现高精度检测的同时保持了实时推理速度,为复杂场景下的3D目标检测提供了有效解决方案。 展开更多
关键词 自动驾驶 点云数据 3d目标检测 弱特征目标检测 局部上下文学习
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利用WGS84-AW3D30 DSM data map表面模型数据作西安80或国家2000大地坐标系统的地形图技术探讨
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作者 叶育松 张雄天 《世界有色金属》 2022年第18期24-27,共4页
针对日常野外测绘及地形图绘制过程中存在的各种问题,本文提供了一种快速、简洁的地形图绘制方法,即利用现成的网络上得到的数据通过一系列的坐标系统转换过程得到工作所需的数据,并完成地形图绘制,为地形图绘制提供了一种新的思路。
关键词 WGS84-AW3d30 DSM data map表面模型数据 西安80坐标系 2000国家大地坐标系
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