Three-dimensional videography using omnidirectional cameras: An approach inspired by the direct linear transformation method

Nagano, Akinori

doi:10.1016/j.jbiomech.2021.110722

Cited by 8 publications

(5 citation statements)

References 6 publications

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“…This was almost identical to that reported by Nagano (2021); readers are referred to this preceding study for details. Briefly, a cuboid space of 2.9 × 0.8 × 0.5 m was set up in the laboratory.…”

Section: Methodssupporting

confidence: 90%

“…The error value of the proposed NLT-inspired method was larger (resultant error:0.34%) than that of the DLT-inspired method (resultant error: 0.22% (Nagano, 2021)) (Table 1). Because these error values were derived from identical datasets, this difference was attributed to the characteristics of the DLT-and NLT-inspired methods.…”

Section: Discussionmentioning

confidence: 95%

“…To address these difficulties, we proposed a method of 3-D motion analysis using omnidirectional cameras, which have a large field of view that covers the entire celestial Advance Publication by J-STAGE Published online January 24, 2024 sphere and can be set up close to the target object (Nagano, 2021). The method in this preceding study was inspired by the DLT method, which assumes that the exact locations of the control points are known in the camera calibration process.…”

Section: Introductionmentioning

confidence: 99%

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A Method of Three-Dimensional Videography using Omnidirectional Cameras with Control Points of Unknown Coordinates

Nagano,

Kudo

2024

Int. J. Sport Health Sci.

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Three-dimensional (3-D) motion analysis is widely used in numerous fields of physical education, including biomechanics, coaching and test and measurement. Among the available 3-D motion analysis methods, the nonlinear transformation (NLT) method is frequently used. Many automated motion capture systems currently utilize this method. However, as this method is based on the perspective projection of ordinary cameras, its use is limited in various situations. Because ordinary cameras have a relatively limited angle of view, they cannot cover a wide target area or be set up near the target area. In this study, we propose a method for 3-D data collection using omnidirectional cameras that can capture images of the entire celestial sphere. For the points of interest, the longitude and latitude of the celestial sphere were obtained from the image of an omnidirectional camera. The direction of the camera ray was determined by considering the polar coordinate system with the longitude and latitude. During the calibration process, the relative position and orientation of the omnidirectional cameras were determined from the images of the control points with unknown 3-D coordinates. We verified that the accuracy of the proposed method (resultant error: 0.34%) was comparable to the accuracy reported in preceding studies regarding traditional NLT and omnidirectional Direct Linear

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Section: Methodssupporting

confidence: 90%

Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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A Method of Three-Dimensional Videography using Omnidirectional Cameras with Control Points of Unknown Coordinates

Nagano,

Kudo

2024

Int. J. Sport Health Sci.

Self Cite

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“…In 2020, Li Qinwen and colleagues addressed the issue of low accuracy in the traditional DLT method when the range of target point movement is limited by introducing laser ranging data [6]. In 2021, Akinori, inspired by the DLT method, proposed an omnidirectional camerabased calibration and 3D reconstruction method, expanding the camera's field of view [7].…”

Section: Direct-linear Change Methodsmentioning

confidence: 99%

Comprehensive Review of Camera Calibration Methods for Three-dimensional Imaging Technology

Zhang,

Kong,

Meng

et al. 2024

IJMEE

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Through a systematic review of relevant literature, this paper comprehensively elucidates the evolution of camera calibration techniques and analyzes key milestones in its development. It introduces traditional camera calibration, self-calibration, and neural network-based camera calibration methods along with their research status, summarizing the characteristics and applicable scenarios of each method in practical applications. Based on the latest research progress, it delineates the latest technologies and methods in the field of camera calibration, highlighting their respective advantages and limitations. Prospects for the future development of camera calibration techniques are provided, exploring potential breakthroughs in high-precision, high-robustness mapping models, and automatic, accurate marking of image feature points, thereby offering valuable insights for addressing complex scenarios in 3D measurement applications.

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“…The direct linear transformation (DLT) theory was proposed by Abdel-Aziz in 1971; it takes several or even ten days for each pair of images to be completely analyzed, thereby affecting the post-processing time [10]. In 2009, Vies et al developed a stereo-photographic ocean wave measurement system and performed an experiment on the coast of Scheveningen [11]. They successfully measured the evolution of waves and they found that the measured sea surface area reached 1800 m 2 [12].…”

Section: Introductionmentioning

confidence: 99%

Research on a Measurement Method for the Ocean Wave Field Based on Stereo Vision

Sun

Wang

et al. 2022

Applied Sciences

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The wave parameter is an important environmental input condition. Traditional contact wave measurement methods are unable to meet the requirements of high precision, non-contact, and ship wave field assessment. Alternatively, stereo vision technology can realize a non-contact and mobile form of measurement. However, this technology suffers from poor timeliness and adaptability. This paper proposes a comprehensive wave measurement method that is based on stereo vision, wherein the gridding of siftGPU is used to achieve the fast matching of large images. The whole algorithm can be run within 6 s and it guarantees more than 20,000 feature-matching logarithms. Furthermore, by utilizing the least squares method and sea surface wave surface theory, the sea surface base level can be calculated without control points, along with the inversion of the sea wave parameters (wave height, period, and wave direction) and error point fitting. The rationality and superiority of the algorithm were verified through multiple comparison experiments. Compared with the Richard Brancker Research (RBR) wave height meter, the measurement error of the wave height is less than 10%, the period error is less than 0.5 s, and the wave direction error is less than 10° with the proposed method.

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Three-dimensional videography using omnidirectional cameras: An approach inspired by the direct linear transformation method

Cited by 8 publications

References 6 publications

A Method of Three-Dimensional Videography using Omnidirectional Cameras with Control Points of Unknown Coordinates

A Method of Three-Dimensional Videography using Omnidirectional Cameras with Control Points of Unknown Coordinates

Comprehensive Review of Camera Calibration Methods for Three-dimensional Imaging Technology

Research on a Measurement Method for the Ocean Wave Field Based on Stereo Vision

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