Current 3D body scanners based on structured light principle are expensive and somewhat bulky machines which limits their wider spread. One of the factors driving the scanner cost up is the requirement to synchronize projector and camera which requires either expensive system components a costly customized hardware synchronization solution. We propose a software solution to the projector-camera synchronization problem which enables construction of low-cost 3D scanner using common commercial off-the-shelf components only: a projector, a camera, and a computer. We also propose a simple calibration procedure for precise measurement of delay time which is necessary to achieve proper synchronization. We have developed a prototype system for 3D human body scanning using the proposed approach which achieves projector-camera synchronization and enables data acquisition at 30 FPS.
Single-shot dense 3D reconstruction using colored structured light is a difficult problem due to the undesired effects of ambient lighting, object albedo, non-equal channel gains, and channel cross-talk. We propose a novel single-shot dense 3D reconstruction using colored structured light. Our method combines the self-equalizing De Bruijn sequence, scale-space analysis, and bandpass complex Hilbert filters to achieve insensitivity to ambient lighting, object albedo, and non-equal channel gains. The proposed method reconstructs about 85% of points compared to time-multiplexing structured light strategies and the decoding error in the recovered projector coordinate is less than one projector pixel for about 90% of reconstructed points.
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