Results 21 to 30 of about 268 (165)

Multi-Lidar System Localization and Mapping with Online Calibration

Applied Sciences, 2023
Currently, the demand for automobiles is increasing, and daily travel is increasingly reliant on cars. However, accompanying this trend are escalating traffic safety issues.
Fang Wang, Xilong Zhao, Hengzhi Gu, Lida Wang, Siyu Wang, Yi Han   +5 more
doaj   +1 more source

Camera Calibration using the Damped Bundle Adjustment Toolbox [PDF]

ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2014
Camera calibration is one of the fundamental photogrammetric tasks. The standard procedure is to apply an iterative adjustment to measurements of known control points. The iterative adjustment needs initial values of internal and external parameters.
N. Börlin, P. Grussenmeyer
doaj   +1 more source

A Stereo-Vision System for Measuring the Ram Speed of Steam Hammers in an Environment with a Large Field of View and Strong Vibrations

Sensors, 2019
The ram speed of a steam hammer is an important parameter that directly affects the forming performance of forgers. This parameter must be monitored regularly in practical applications in industry.
Ran Chen, Zhongwei Li, Kai Zhong, Xingjian Liu, Yonghui Wu, Congjun Wang, Yusheng Shi   +6 more
doaj   +1 more source

Calibration of Large-Scale Spatial Positioning Systems Based on Photoelectric Scanning Angle Measurements and Spatial Resection in Conjunction with an External Receiver Array

Applied Sciences, 2020
Positioning systems providing high-precision real-time measurements over very large spatial scales are urgently required for large-scale industrial manufacturing applications.
Chunbao Xiong, Hongzhi Bai
doaj   +1 more source

Simulation of internal nitrogen release from bottom sediments in an urban lake using a nitrogen flux model

Water Science and Engineering, 2023
Nutrient release from sediment is considered a significant source for overlying water. Given that nutrient release mechanisms in sediment are complex and difficult to simulate, traditional approaches commonly use assigned parameter values to simulate ...
Ran Gong, Hui-ya Wang, Zhi-xin Hu, Yi-ping Li   +3 more
doaj   +1 more source

Three-Point Marking Method to Overcome External Parameter Disturbance in Stereo-DIC Based on Camera Pose Self-Estimation

IEEE Access, 2020
Stereo digital image correlation (stereo-DIC) requires the stereo-camera system to remain fixed during the measurement process. This requirement brings a lot of inconvenience to the practical application of stereo-DIC.
Chang Ma, Zhoumo Zeng, Hui Zhang, Hengrui Cui, Xiaobo Rui   +4 more
doaj   +1 more source

Development and validation of an individual-based state-transition model for the prediction of frailty and frailty-related events.

PLoS ONE, 2023
Frailty is a biological syndrome that is associated with increased risks of morbidity and mortality. To assess the value of interventions to prevent or manage frailty, all important impacts on costs and outcomes should be estimated. The aim of this study
Aubyn Pincombe, Hossein Haji Ali Afzali, Renuka Visvanathan, Jonathan Karnon   +3 more
doaj   +2 more sources

ResCalib: Joint LiDAR and Camera Calibration Based on Geometrically Supervised Deep Neural Networks

Leida xuebao
Light Detection And Ranging (LiDAR) systems lack texture and color information, while cameras lack depth information. Thus, the information obtained from LiDAR and cameras is highly complementary.
Jiahui CHAI, Minglei LI, Min LI, Dazhou WEI, Guangyong CHEN   +4 more
doaj   +1 more source

A Vision-Based Self-Calibration Method for Robotic Visual Inspection Systems

Sensors, 2013
A vision-based robot self-calibration method is proposed in this paper to evaluate the kinematic parameter errors of a robot using a visual sensor mounted on its end-effector.
Shibin Yin, Yongjie Ren, Jigui Zhu, Shourui Yang, Shenghua Ye   +4 more
doaj   +1 more source

Improved Tracking and Docking of Industrial Mobile Robots Through UKF Vision-Based Kinematics Calibration

IEEE Access, 2021
Performing an open-loop movement, or docking, for an industrial mobile robot (IMR), is a common necessary procedure when relying on environmental sensors is not possible.
Stefano Mutti, Nicola Pedrocchi
doaj   +1 more source