“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, […]

“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) […]