Towards a real-time 3D shape reconstruction using a structured light system

Flexible calibration of structured-light systems projecting point patterns

“…. , K} with K P 2 while the camera is fixed (unlike the methods [10,20,11], the calibration board displacement is done manually and approximately with a rough translation along the cameraz c axis). For each position k, we define a related ''world coordinate system'' fw k g ¼ ðO k ;x k ;ỹ k ;z k Þ using three control disk centers (CDC) among the four in such a way thatz k is orthogonal to the calibration plane (see Fig.…”

“…for profilometry. On the other hand, projecting a set of points [10,11] can be a solution for very different computer vision tasks. When projecting a dense point set, surfaces can be very accurately constructed with high 3D resolution.…”

“…The SLSs proposed in [10,20,11] project a grid of points onto a known surface using a laser beam and optics required for generating the grid. The projection angle between each laser point trajectory and the central projection axis is fixed and known.…”

“…To calibrate the system, dedicated equipment is used to place a calibration board perfectly orthogonal to the main projection axis and to displace it very precisely to known positions. From the projector calibration methods presented so far, we notice that they usually involve expensive equipments such as three orthogonal planes [17] or dedicated and precise positioning devices [10,20,11]. In addition to their expensive cost and their lack of flexibility, the performance of these methods heavily depends on the precision of the required calibration equipment.…”

Object Surface Reconstruction from One Camera System

“…Published methods deal with the reconstruction from multiple images (P. Lavoie et al [8], H. Saito and T. Kanade [9]) and from one still image (J. Pages et al [10,11], F. Ababsa et al [12], A. Dipanda and S. Woo [13]). Problems that arise in reconstruction using the structured light are caused by the opposite sides of the object, which become literally invisible.…”