“High dynamic range real-time 3D shape measurement,” Opt. Express, 2016

C. Jiang, T. Bell, and S. Zhang, “High dynamic range real-time 3D shape measurement,” Opt. Express., 24(7), 2016; doi: 10.1364/OE.24.007337 (Cover Feature) ABSTRACT This paper proposes a method that can measure high-contrast surfaces in real-time without changing camera exposures. We propose to use 180-degree phase-shifted (or inverted) fringe patterns to complement regular fringe patterns. If not all of the […]

“Method for out-of-focus camera calibration,” Appl. Opt., 2016

T. Bell, J. Xu, and S. Zhang, “Method for out-of-focus camera calibration,” Appl. Opt., 55(14), 2016; doi: 10.1364/AO.55.002346 ABSTRACT State-of-the-art camera calibration methods assume that the camera is at least nearly in focus, and thus fail if the camera is substantially defocused. This paper presents a method which enables the accurate calibration of an out-of-focus camera. Specifically, […]

“Structured Light Techniques and Applications,” Wiley Encyclopedia of Electrical and Electronics Engineering, 2016

T. Bell, B. Li, and S. Zhang,  “Structured Light Techniques and Applications,” Wiley Encyclopedia of Electrical and Electronics Engineering, Edited by J. Webster, 2016; (Invited) ABSTRACT Modern hardware and algorithms, developed through several decades of research in multiple disciplines, are contributing toward the continuous advancement of 3D scanning technologies. Simply put, these technologies allow for […]

“Multiwavelength depth encoding method for 3D range geometry compression,” Appl. Opt., 2015

T. Bell and S. Zhang, “Multiwavelength depth encoding method for 3D range geometry compression”, Appl. Opt., 54(36), 10684-10961, 2015; doi: 10.1364/AO.54.010684 ABSTRACT This paper presents a novel method for representing three-dimensional (3D) range data within regular two-dimensional (2D) images using multiwavelength encoding. These 2D images can then be further compressed using traditional lossless (e.g., PNG) or lossy (e.g., JPEG) […]

“Toward superfast three-dimensional optical metrology with digital micromirror device platforms,” Opt. Eng., 2014

T. Bell and S. Zhang, “Toward superfast three-dimensional optical metrology with digital micromirror device platforms,” Opt. Eng., 53(11), 112206, 2014; doi: 10.1117/1.OE.53.11.112206 ABSTRACT This paper presents a novel method for representing three-dimensional (3D) range data within regular two-dimensional (2D) images using multiwavelength encoding. These 2D images can then be further compressed using traditional lossless (e.g., PNG) or lossy (e.g., JPEG) […]