Detection of surface points with an 850nm laser and an NDI stereo camera

Goerlach, Franziska S.; Lueddemann, Tobias; Pfeiffer, Jonas; Lueth, Tim C.

doi:10.1109/biorob.2014.6913863

Cited by 4 publications

(1 citation statement)

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“…Camera imaging in the NIR band can remarkably reduce the impact of environmental noise on the measurement results and further decrease the complexity of feature extraction [ 16 ], thus NIR cameras are widely used for object tracking, such as NDI Polaris [ 9 ], Vicon [ 17 ], and Qualisys [ 18 ]. NIR trinocular stereo vision (TSV) is introduced into OTS in this paper, and main improvements are as follows: A fast nearest neighbor feature point extraction algorithm (FNNF) is proposed.…”

Section: Introductionmentioning

confidence: 99%

High Precision Optical Tracking System Based on near Infrared Trinocular Stereo Vision

Zou

et al. 2021

Sensors

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A high precision optical tracking system (OTS) based on near infrared (NIR) trinocular stereo vision (TSV) is presented in this paper. Compared with the traditional OTS on the basis of binocular stereo vision (BSV), hardware and software are improved. In the hardware aspect, a NIR TSV platform is built, and a new active tool is designed. Imaging markers of the tool are uniform and complete with large measurement angle (>60°). In the software aspect, the deployment of extra camera brings high computational complexity. To reduce the computational burden, a fast nearest neighbor feature point extraction algorithm (FNNF) is proposed. The proposed method increases the speed of feature points extraction by hundreds of times over the traditional pixel-by-pixel searching method. The modified NIR multi-camera calibration method and 3D reconstruction algorithm further improve the tracking accuracy. Experimental results show that the calibration accuracy of the NIR camera can reach 0.02%, positioning accuracy of markers can reach 0.0240 mm, and dynamic tracking accuracy can reach 0.0938 mm. OTS can be adopted in high-precision dynamic tracking.

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Section: Introductionmentioning

confidence: 99%