Abstract
A novel dual-frequency pattern is developed which combines a high-frequency sinusoid component with a unit-frequency sinusoid component, where the high-frequency component is used to generate robust phase information, and the unit-frequency component is used to reduce phase unwrapping ambiguities. With our proposed pattern scheme, phase unwrapping can overcome the major shortcomings of conventional spatial phase unwrapping: phase jumping and discontinuities. Compared with conventional temporal phase unwrapped approaches, the proposed pattern scheme can achieve higher quality phase data using a less number of patterns. To process data in real time, we also propose and develop look-up table based fast and accurate algorithms for phase generation and 3-D reconstruction. Those fast algorithms can be applied to our pattern scheme as well as traditional phase measuring profilometry. For a 640 x 480 video stream, we can generate phase data at 1063.8 frames per second and full 3-D coordinate point clouds at 8.3 frames per second. These achievements are 25 and 10 times faster than previously reported studies.
Highlights
Structured Light Illumination (SLI) [1,2,3] is an active three dimensional (3-D) shape measurement technique widely used for scientific and industrial purposes [4]
We propose a novel dual-frequency pattern scheme that combines, into a single pattern, a high-frequency SLI pattern with a unit-frequency pattern where the high-frequency component generates wrapped phase, resilient to sensor noise, while the unit-frequency component enables phase unwraping
To achieve real-time 3-D video acquisition and reconstruction, this paper introduces a lossless lookup table (LUT) method for phase, intensity/texture, and depth data that works in combination with a high-speed projector/camera pair widely used in phase measurement profilometry (PMP) [23]
Summary
Structured Light Illumination (SLI) [1,2,3] is an active three dimensional (3-D) shape measurement technique widely used for scientific and industrial purposes [4]. Higher frequency patterns have been studied and employed to improve measurement accuracy at the extra computational cost of phase unwrapping. With regard to high-speed or real-time 3-D measurement, researchers have proposed oneshot [2,18,19,20] methods that reconstruct depth from a single, continuously projected pattern, while others have proposed employing a high-speed camera and projector pair. One-shot SLI techniques are attractive for their insensitivity to object motion, where pattern strategies are based on spatial neighborhood coding, but suffering from poor resolution and high computational cost [2]. To achieve real-time 3-D video acquisition and reconstruction, this paper introduces a lossless lookup table (LUT) method for phase, intensity/texture, and depth data that works in combination with a high-speed projector/camera pair widely used in phase measurement profilometry (PMP) [23]. For the proposed novel dual-frequency pattern scheme, where the number of patterns is set to 6, as shown in Sec. 4, our fast LUT-based algorithms can be applied
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
