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- 摘要
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- 实验方案
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Comprehensive Remote Sensing || Geometric Processing: Active Sensor Modeling and Calibration (LiDAR)
摘要： The main concept of laser ranging is facilitating the estimation of the distance between the laser beam firing point and its footprint. For time-of-flight systems (ToF), whether pulse-based or phase-shift-based systems, the range is evaluated through the estimation of the time lapse between laser emission and reception. This time when coupled with the speed of the laser beam provides an estimate of the distance between the laser beam firing point and its footprint. One should note that this chapter is not concerned with triangulation-based ranging systems that are comprised of an integrated laser and camera system—that is, the range is estimated using an accurately estimated relative relationship between the laser and camera units.
关键词： system calibration,LiDAR,point cloud,laser ranging,time-of-flight
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Increased reliability of outdoor millimeter-wave link simulations by leveraging lidar point cloud
摘要： Exploitation of the millimeter-wave (mmWave) band for both the small-cell radio access (RAN) and in-street backhauling must contribute to strongly increase the capacity of next-generation outdoor wireless networks. Beside the numerous technological challenges faced by the equipment manufacturers, the definition of practical deployment requirements and elaboration of efficient network design procedures are key issues for future network providers and the refinement of business models. The work reported in the present paper is part of research activity on small-cell and wireless backhaul design methodologies. The authors analyze how digital geographical data and radio propagation models may be enhanced and tailored to answer new mmWave simulation requirements. Three different propagation methods are compared in an urban 60 GHz scenario: based on free building database, traditional high-resolution map data, or Lidar point cloud. The advantage of the multi-paths prediction versus direct-path is also investigated, using the Lidar point cloud as a simulation input.
关键词： millimeter-wave propagation,Lidar point cloud,simulation
更新于2025-09-04 15:30:14
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[ACM Press the 9th ACM Multimedia Systems Conference - Amsterdam, Netherlands (2018.06.12-2018.06.15)] Proceedings of the 9th ACM Multimedia Systems Conference on - MMSys '18 - Skeleton-based continuous extrinsic calibration of multiple RGB-D kinect cameras
摘要： Applications involving 3D scanning and reconstruction & 3D Tele-immersion provide an immersive experience by capturing a scene using multiple RGB-D cameras, such as Kinect. Prior knowledge of intrinsic calibration of each of the cameras, and extrinsic calibration between cameras, is essential to reconstruct the captured data. The intrinsic calibration for a given camera rarely ever changes, so only needs to be estimated once. However, the extrinsic calibration between cameras can change, even with a small nudge to the camera. Calibration accuracy depends on sensor noise, features used, sampling method, etc., resulting in the need for iterative calibration to achieve good calibration. In this paper, we introduce a skeleton based approach to calibrate multiple RGB-D Kinect cameras in a closed setup, automatically without any intervention, within a few seconds. The method uses only the person present in the scene to calibrate, removing the need for manually inserting, detecting and extracting other objects like plane, checker-board, sphere, etc. 3D joints of the extracted skeleton are used as correspondence points between cameras, after undergoing accuracy and orientation checks. Temporal, spatial, and motion constraints are applied during the point selection strategy. Our calibration error checking is inexpensive in terms of computational cost and time and hence is continuously run in the background. Automatic re-calibration of the cameras can be performed when the calibration error goes beyond a threshold due to any possible camera movement. Evaluations show that the method can provide fast, accurate and continuous calibration, as long as a human is moving around in the captured scene.
关键词： 3D Skeleton,Interactive 3D Tele-Immersion,Point-Cloud,3D Calibration,Real-time
更新于2025-09-04 15:30:14