Golf Green Slope Estimation Using a Cross Laser Structured Light System and an Accelerometer

Pham, Duy Duong; Dang, Quoc Khanh; Suh, Young Soo

doi:10.5370/jeet.2016.11.2.508

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…Due to their acceptable accuracy, low cost, light weight, compact size, and user-friendliness, these wearable IMUs have become one of the most preferred solutions for motion tracking. Motion tracking can be used for gait analyses [ 10 , 11 , 12 ], pedestrian navigation [ 13 ], the control system of an industrial robot trajectory [ 14 , 15 , 16 ], and sports-related applications [ 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Fast calibration for parameters of an inertial measurement unit fixed to a standard walker

Doan

Pham

2020

Heliyon

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A system consisting of an inertial measurement unit (IMU) mounted on a walker is proposed. The objective of this system is to monitor a user's walking. The relationship between the walker and the IMU, which cannot be easily measured manually, plays an important role in the system. There are various relationships because of the different types of walkers, as well as adjustments made to the height of the walker legs for comfortable usage. In this study, we propose a simple procedure for fast calibration, which consists of the attitude and the position of the IMU with respect to the walker coordinate system. The procedure includes slightly tilting the walker to the front, back, right, and left. A Kalman filter based on the inertial navigation system is used to estimate the trajectory of the IMU during tilting movements. The relationship can be calibrated using the estimated trajectory and geometric characteristics of walkers. The results of the experiments show that the proposed method achieves acceptable accuracy (97% of distance and position) and convenience.

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Section: Introductionmentioning

confidence: 99%

Fast calibration for parameters of an inertial measurement unit fixed to a standard walker

Doan

Pham

2020

Heliyon

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“…Zhang et al [11][12][13] designed a cross-structured light (CSL) sensor to detect weld lines for visual tracking of a wall-climbing robot. Pham et al [14] proposed a method that combined an accelerometer with a CSL system to estimate the slope of a green on a golf course. CSL sensors are a popular subject of study with researchers.…”

Section: Introductionmentioning

confidence: 99%

Robust laser stripe extraction for three-dimensional reconstruction based on a cross-structured light sensor

2017

Appl. Opt.

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Cross-structured light sensor architecture for 3D reconstruction was established. An improved center of mass method was proposed for laser stripe extraction. For each initial laser stripe center point, the center of mass method was performed along the normal direction that was calculated using the Hessian matrix. The normal directions can be used to divide the laser stripe center points into two categories. Laser stripe extraction experiments showed that the proposed method is fast and robust. 3D reconstruction of a cylinder was used to analyze reconstruction accuracy, with relative accuracy of less than 0.15 mm. 3D reconstruction of a shoe last showed that cross-structured light sensors can obtain more abundant information than single-structured light sensors.

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Inertial navigation algorithm for trajectory of front-wheel walker estimation

Doan

Pham

2019

Heliyon

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In this paper, we propose a system for trajectory of walker estimation. The system consists of an inertial measurement unit (IMU) and two encoders attached to a front-wheel walker. The IMU is employed to estimate the trajectory of the walker while the encoders are used to update the trajectory of the walker during rolling on the floor. Three update equations are proposed: quaternion update using the vertical vector, quaternion update using the yaw angle of the walker and position update using encoders. We implemented an experiment which focused on four walking styles of: continuous rolling, step by step rolling, complete lifting and 2 back tips lifting. Results of the experiment show the appropriateness of proposed update equations in all cases in general and in continuous rolling in particular.

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Golf Green Slope Estimation Using a Cross Laser Structured Light System and an Accelerometer

Cited by 3 publications

References 9 publications

Fast calibration for parameters of an inertial measurement unit fixed to a standard walker

Fast calibration for parameters of an inertial measurement unit fixed to a standard walker

Robust laser stripe extraction for three-dimensional reconstruction based on a cross-structured light sensor

Inertial navigation algorithm for trajectory of front-wheel walker estimation

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