Article
Computer Science, Information Systems
Xu Yang, Houxing Lin, Jie Luo, Lei Chen, Yu Lei
Summary: The proposed ternary Gray-code method, utilizing 2D modulation instead of 1D modulation, improves measurement speed and reduces variance in introduced intermediate gray values by nearly 90%, addressing limitations in traditional methods related to measuring range and noise. Experimental and simulation results confirm the superiority of the proposed method.
Article
Optics
Yueyang Li, Junfei Shen, Zhoujie Wu, Qican Zhang
Summary: In this paper, a passive defocusing method based on deep learning is proposed to reduce phase error and generate high-quality three-step sinusoidal patterns. Experimental results show that this method outperforms the traditional method by providing more accurate and robust results within a large measuring depth.
Article
Optics
Eugene Wong, Stefan Heist, Christian Braeuer-Burchardt, Andreas Stark, Holger Babovsky, Richard Kowarschik
Summary: This study introduces a solution for synthesizing MAAP calibration images from any camera view, allowing for 3D measurements from alternate camera placements without re-calibrating the entire MAAP process.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Computer Science, Software Engineering
Mahdi Abbaspour Tehrani, M. Gopi, Aditi Majumder
Summary: This article presents an automated multi-projector registration system for multiple uncalibrated projectors and cameras on arbitrary surfaces. The method estimates parameters, registers projectors geometrically without fiducials, and allows for quick recalibration with projector movements. This system enables easy deployment of spatially augmented reality environments of various sizes, shapes, and configurations.
IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS
(2021)
Article
Optics
Zhangying Wang, Kui Li, Nan Gao, Zhaozong Meng, Zonghua Zhang
Summary: In this paper, a method is proposed to overcome the challenge of dealing with high dynamic range (HDR) objects in traditional fringe projection profilometry (FPP). The method divides the object surface into different reflectivity areas using different intensity responses and a uniform blue image. Experimental results demonstrate the accurate measurement of HDR objects with large variation range of reflectivity using the proposed method.
Article
Engineering, Multidisciplinary
Jing Yu, Yaqin Zhang, Zewei Cai, Qijian Tang, Xiaoli Liu, Jiangtao Xi, Xiang Peng
Summary: This paper proposes a high-precision measurement method for structured-light three-dimensional measurement systems, successfully reducing errors caused by camera perspective projection through the analysis of the optical configuration and calibration strategy of commercial projectors.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Article
Optics
Takashi Iwasa, Yoshiki Okumura
Summary: This study proposes a simple method to extend the measurement range in an optical direction for a fringe projection technique. The method inserts a baseline to the conventional fringe pattern and computes an exact phase alignment in the extended area. The effectiveness and applicability of the method are demonstrated through tests on different objects.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Chaoqun Xiang, Zhiwei Li, Fei Wang, Yisheng Guan, Weibin Zhou
Summary: This study presents a fully 3D-printed flexible gripper that utilizes electroadhesion technology and mechanical clamping force for object grasping. The gripper is made from multiple materials and the optimal size configuration is determined. It is expected that these flexible grippers can be widely applied in soft robots.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Optics
Fanfei Li, Shaohui Zhang, Lusong Li, Chenxu Xia, Jiankun Sun, Qun Hao
Summary: This paper proposes a method for high dynamics range 3D imaging in scenes with complex reflectivity, using a time-slicing strategy and phase unwrapping technique to achieve accurate measurement.
Article
Multidisciplinary Sciences
Xu Cheng, Zhichao Fan, Shenglian Yao, Tianqi Jin, Zengyao Lv, Yu Lan, Renheng Bo, Yitong Chen, Fan Zhang, Zhangming Shen, Huanhuan Wan, Yonggang Huang, Yihui Zhang
Summary: We present a rational microlattice design that enables the transformation of 2D films into programmable 3D curved mesosurfaces through mechanically guided assembly. Shape programming is achieved through analytical modeling and a machine learning-based computational approach, determining the heterogeneous 2D microlattice patterns necessary for target 3D curved surfaces. We demonstrate the versatility of this method with various geometries and applications, such as a conformable cardiac electronic device, a stingray-like dual mode actuator, and a 3D electronic cell scaffold.
Article
Chemistry, Analytical
Hui Ren, Yuankun Liu, Yajun Wang, Ningyi Liu, Xin Yu, Xianyu Su
Summary: The proposed novel uniaxial 3-D shape measurement system utilizes a tilted and fixed projection grating to achieve auto-synchronous phase-shifting and defocusing by slightly rotating a mirror. This method makes the measurement more compact and flexible, and simulations and experiments have shown its validity.
Article
Engineering, Manufacturing
Yuan Chen, Zhengyang Yu, Hale Oguzlu, Jungang Jiang, MiJung Cho, Muzaffer Karaaslan, Scott Renneckar, Feng Jiang
Summary: This study successfully developed a method to modify waterborne polyurethane by adding cellulose nanofibrils to enhance its printability in 3D printing. The improved composite inks demonstrated excellent printability and can be widely applied in the field of biomaterials.
ADDITIVE MANUFACTURING
(2021)
Article
Chemistry, Analytical
Yuzhuo Zhang, Yaqin Sun, Nan Gao, Zhaozong Meng, Zonghua Zhang
Summary: This study proposed a phase target method based on projector radial chromatic aberration measurement and calibration to improve the color fringing issue in a color fringe projection 3D measurement system. Experimental results showed that the proposed method effectively measured and calibrated the radial chromatic aberration of the projector, leading to improved projection quality.
Article
Materials Science, Multidisciplinary
Tetsuhiko F. Teshima, Lukas Hiendlmeier, Korkut Terkan, Sabine Zips, Leroy Grob, Francisco Zurita, Philipp Rinklin, Bernhard Wolfrum
Summary: The study introduces a novel 3D-printable and highly deformable structure inspired by Nanjing Tamasudare, allowing smooth insertion into target tissue. The structure rapidly transitions from flat to linear, elongated shapes and is connected through multiple units. This design is widely applicable for insertion operations of implantable devices or electronics.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Biochemical Research Methods
Paul Cochard-Marchewka, Nicolas Bremond, Jean Baudry
Summary: The rheology of concentrated protein solutions is crucial for understanding macromolecular crowding dynamics and protein therapeutics formulation. However, conventional viscosity measurement methods are limited by cost and scarcity of protein samples. To address this issue, we developed a microsystem combining microfluidics and microrheology that allows for precise and robust viscosity measurements of high-concentration aqueous solutions. Our methodology, validated by studying sucrose solutions, enables viscosity measurements along an extended concentration range in just one experiment. This approach showcases its viability for the study of biopharmaceuticals with minimal sample consumption.
Article
Optics
Song Zhang
OPTICS AND LASERS IN ENGINEERING
(2020)
Article
Optics
Min Zhong, Xiaowei Hu, Feng Chen, Chao Xiao, Duan Peng, Song Zhang
Article
Optics
Jae-Sang Hyun, Song Zhang
Review
Optics
Andres G. Marrugo, Feng Gao, Song Zhang
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2020)
Article
Medicine, Legal
Yi-Hong Liao, Jae-Sang Hyun, Michael Feller, Tyler Bell, Ian Bortins, James Wolfe, David Baldwin, Song Zhang
Summary: The paper introduced a high-resolution 3D imaging technology using DFP techniques dedicated to capturing footwear and tire impressions. With fully automated software algorithms and a user-friendly interface, this technology achieves similar levels of accuracy and resolution as a high-end 3D scanner, while being more affordable, easier to operate, and more robust. Compared to the current practice of casting, this technology is non-destructive, collects more evidence detail, especially for fragile impressions, requires less time and money, and results in easily shareable digital files.
JOURNAL OF FORENSIC SCIENCES
(2021)
Article
Optics
Jing Zhang, Bin Luo, Xin Su, Lu Li, Beiwen Li, Song Zhang, Yajun Wang
Summary: This paper introduces a novel and simple 3D reconstruction model based on a parallel-axis structured light system, which is more convenient and time-saving compared to traditional methods. Experimental results demonstrate that the proposed method can achieve high-precision 3D shape measurement.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Optics
Andres G. Marrugo, Raul Vargas, Lenny A. Romero, Song Zhang
Summary: The proposed method aims to increase the overall accuracy of a large-scale structured light system by multi-stage calibration, calibrating intrinsic and extrinsic parameters separately and establishing pixel-wise phase-to-coordinate relationships using polynomial functions to achieve sub-millimeter high precision within a large volume.
Article
Optics
Song Zhang
Summary: This paper introduces a novel method for accurately calibrating a structured light system with only one structured pattern. By leveraging existing camera calibration, it extracts calibration poses for each pixel to establish a relationship between coordinates and phase. It addresses phase artifacts caused by high-contrast calibration targets, achieving 6.6 times higher accuracy for flat surface measurements compared to traditional methods requiring two directional fringe patterns.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Optics
Liming Chen, Xiaowei Hu, Song Zhang
Summary: This paper presents a calibration method for a microscopic structured light system with an extended depth of field. The method employs the focal sweep technique to achieve a large depth measurement range and develops a computational framework to alleviate phase errors caused by the calibration target. Experimental results demonstrate high measurement accuracy in a large measurement volume.
Article
Optics
Yi-Hong Liao, Manzhu Xu, Song Zhang
Summary: This paper presents an absolute phase unwrapping method for high-speed three-dimensional shape measurement. By using a set of three phase-shifted patterns and one binary random pattern on a structured light system, the proposed method achieves high-speed and high-quality measurement of complex scenes.
Article
Optics
Song Zhang
Summary: This study proposes the use of a calibration target with a narrow spectral color range for the background and a broader spectral color range for the feature points, along with fringe patterns matching the background color for accurate phase extraction. By eliminating the computational framework estimate smooth phase near high-contrast feature edges, this method significantly simplifies and improves the algorithm.
Article
Chemistry, Analytical
Yi-Hong Liao, Song Zhang
Summary: This paper presents an absolute phase unwrapping method for high-speed three-dimensional shape measurement on a single-camera, single-projector structured light system. The method utilizes speckle-embedded three-step phase-shifted patterns to obtain the wrapped phase of the object and employs the Semi-Global Matching (SGM) algorithm to establish the coarse correspondence between images. A computational framework is then used to determine the fringe order pixel by pixel. The experimental results demonstrate the high-speed and high-quality 3D measurements achieved by the proposed method for complex scenes.
Article
Optics
Song Zhang
Summary: The article introduces an innovative method for calibrating a single-camera and single-projector structured light system without the need for physical calibration targets. Instead, a digital display is used for camera calibration and a flat surface is used for projector calibration. The method requires a secondary camera to facilitate the process. The proposed method offers flexibility and simplicity in achieving accurate calibration for structured light systems, as demonstrated by experimental results.
Article
Optics
Liming Chen, Wang Xiang, Song Zhang
Summary: This Letter presents a novel method for calibrating multi-focus microscopic structured-light 3D imaging systems with an electrically adjustable camera focal length. The system is calibrated using a reference focal length and other discrete focal lengths, and a polynomial function model is used to fit the calibration results.
Article
Chemistry, Analytical
Anna Lena Lorenz, Song Zhang
Summary: This paper presents a non-contact continuous respiration monitoring method based on Fringe Projection Profilometry (FPP), which overcomes the limitations of traditional intrusive techniques by providing continuous monitoring without interfering with normal breathing. The FPP sensor captures three-dimensional respiratory motion from the chest wall and abdomen, and the analysis algorithms extract respiratory parameters. The experimental results demonstrate high signal-to-noise ratio and good correlation with a reference signal obtained from a spirometer.
