Article
Optics
Bowen Sun, Jiongqi Wang, Haiyin Zhou, Haibo Liu, E. Wei, Xuanying Zhou
Summary: This study analyzes the sensitivity of narrow FOV cameras to the angle between stars and classifies and researches the systematic errors of narrow FOV cameras. The proposed on-orbit calibration method is more effective than traditional methods.
Article
Geosciences, Multidisciplinary
Manabu Yamada, Toru Kouyama, Koki Yumoto, Eri Tatsumi, Naofumi Takaki, Yasuhiro Yokota, Tomokatsu Morota, Naoya Sakatani, Masahiko Hayakawa, Moe Matsuoka, Rie Honda, Chikatoshi Honda, Shingo Kameda, Hidehiko Suzuki, Yuichiro Cho, Kazuo Yoshioka, Kazunori Ogawa, Kei Shirai, Hirotaka Sawada, Seiji Sugita
Summary: After delivering its sample capsule, Hayabusa2 will perform a flyby of asteroid 2001 CC21 in 2026 and rendezvous with asteroid 1998 KY26 in 2031. However, the ONC and ONC-T cameras have experienced optical deterioration and decreased sensitivity, posing challenges for the extended mission.
EARTH PLANETS AND SPACE
(2023)
Article
Environmental Sciences
Xinchao Xu, Mingyue Liu, Song Peng, Youqing Ma, Hongxi Zhao, Aigong Xu
Summary: This paper proposes a method to achieve high-precision calibration of the planetary rover navigation camera using limited initial data in-orbit. By constructing a joint adjustment model with multiple constraints and introducing an adaptive brightness-weighted line extraction method, the proposed approach outperforms other methods in terms of accuracy. It has also been successfully implemented in China's deep space exploration missions.
Article
Astronomy & Astrophysics
Toru Kouyama, Eri Tatsumi, Yasuhiro Yokota, Koki Yumoto, Manabu Yamada, Rie Honda, Shingo Kameda, Hidehiko Suzuki, Naoya Sakatani, Masahiko Hayakawa, Tomokatsu Morota, Moe Matsuoka, Yuichiro Cho, Chikatoshi Honda, Hirotaka Sawada, Kazuo Yoshioka, Seiji Sugita
Summary: Accurate measurements of the surface brightness of Ryugu are essential for reliable observations of planetary bodies, with calibration showing significant sensitivity degradation in the ONC-W1 camera after touchdown operations, likely caused by contamination from thruster gas and sampler projectile impact. ONC-T, located close to W1, experienced smaller sensitivity degradation. Dust was identified as a main cause, with uncertainty in absolute sensitivity and small changes in relative spectral responsivity.
Article
Optics
Xing Qu, Pengyu Hu, Huiwen Deng, Yu Duan, Shuming Yang
Summary: This paper proposes two methods based on blinking pattern and calibration panel motion to solve the problem of DVS not being able to directly detect traditional control points. The experimental results show that both methods can significantly reduce the standard deviation compared to the conventional methods.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Computer Science, Information Systems
Jonguk Kim, Hyansu Bae, Suk Gyu Lee
Summary: This paper proposes a stereo camera calibration method based on calibration and validation techniques, with experimental results demonstrating its efficiency.
Article
Astronomy & Astrophysics
Romain Garmier, Alex Torres, Thierry Martin, Laurence Lorda, Elisabet Canalias, Aurelie Moussi, Jens Biele, Frank Scholten, Ralf Jaumann, Tra-Mi Ho, Yuya Mimasu, Yuichi Tsuda
Summary: The MASCOT lander successfully performed in situ measurements on the surface of the asteroid, significantly contributing to the overall scientific return of the Hayabusa2 mission. A comprehensive understanding of MASCOT's attitudes at different moments is crucial for data analysis, with attitude reconstruction being achieved through Photo Electric Cells data and camera images.
PLANETARY AND SPACE SCIENCE
(2021)
Article
Multidisciplinary Sciences
Wei-wei Sheng
Summary: This paper proposes a precise measurement method and corresponding calibration procedure for a line structure light vision sensor with a large measurement range. By utilizing a linear translation stage and planar target, the relationship between the center point of the laser stripe and the perpendicular/horizontal distance is obtained. The proposed method eliminates the need for distortion compensation and significantly improves measurement precision.
SCIENTIFIC REPORTS
(2023)
Article
Optics
Ning Yan, Dongxue Wang, Shuangxiong Yin, Zhipeng Guo, Xiaodong Zhang
Summary: Phase measurement deflectometry (PMD) is a high-precision optical surface measurement method that achieves accuracy comparable to interference methods through a simple system structure. By replacing a large screen with two small screens and a single point, the proposed improvements in the traditional binocular PMD method increase system flexibility and measurement accuracy.
Article
Engineering, Multidisciplinary
Mojtaba Akhoundi Khezrabad, Mohammad Javad Valadan Zoej, Alireza Safdarinezhad
Summary: This article proposes an automatic geometric correction method that reduces image geometric distortions by using sequential transformations in conjunction with video-assisted navigation strategy. The proposed method significantly improves the accuracy between the image and ground spaces compared to common methods.
Article
Engineering, Multidisciplinary
Prosenjit Banerjee, Debashish Chakravarty, Biswajit Samanta
Summary: This paper discusses the design and implementation of a laboratory-based AOI system for monitoring the surface condition of conveyor belt segments. The system utilizes a low-cost web camera and a line laser projection device to capture color and depth images of the belt surface. A factorial experimental design is used to examine the impact of different inspection parameters on the measurement error percentage of the AOI system. The optimal settings are found to be an imaging distance of 60 cm, a field of view of 75, illumination of 0 lux, an inspection speed of 9 cm/s, and a camera frame rate of 75 frames per second.
Article
Chemistry, Analytical
Jiawen Weng, Weishuai Zhou, Simin Ma, Pan Qi, Jingang Zhong
Summary: This paper proposes a model-free lens distortion correction method based on the phase analysis of fringe-patterns. By analyzing the phase demodulation of fringe-patterns, the distortion displacement map for the entire distorted image can be determined, leading to image correction. The method also automatically measures the distortion center by character analysis, and numerical simulations and experiments with a wide-angle lens validate its effectiveness.
Article
Multidisciplinary Sciences
Tobias Baumgartner, Benjamin Paassen, Stefanie Klatt
Summary: Collecting large datasets for investigations into human locomotion is expensive and labor-intensive. Accurate methods for 3D human pose estimation in the wild could assist with collecting datasets for analyzing running kinematics from TV broadcast data. However, current state-of-the-art 3D human pose estimation methods are not yet accurate enough for kinematics research, as small differences in 3D angles play a significant role in biomechanical research.
SCIENTIFIC REPORTS
(2023)
Article
Optics
Jianyu Dou, Chong Pan, Jianhua Liu
Summary: The present study investigates the robustness of a neural network-based camera calibration method for 3D spatial positioning via machine vision. A dimensionless error attenuation coefficient is proposed to measure the robustness of the calibration model, showing that the neural network model outperforms traditional models in terms of robustness. The neural network model significantly improves the robustness and accuracy of 3D spatial positioning in asymmetric camera layouts and multiple camera joint calibration scenarios.
Article
Optics
Jixiao Liu, Jupu Yang, Jingchen Li, Jialin Du, Siyang Yu, Fanxing Li, Jian Wang, Xi Zhang, Si Sun, Wei Yan
Summary: In this paper, a calibration method for high-precision zoom lenses of optical measurement machines based on Fully Connected Neural Network (FNN) is proposed. It achieves continuous calibration at any zoom setting by calibrating typical zooms, with better overall calibration precision and meeting the application requirements of high-precision optical measurement machines.
