Hybrid 3d optical scanning system

A hybrid optical scanning system using active stereo 3D reconstruction and deflectometry techniques for acquiring three-dimensional measurements of an object surface under inspection, comprising:

• a digital projector for projecting a sequence of multi-scale random patterns along a direct optical path projected upon the object surface at a predetermined incident angle;
• light path deflector means disposed for selectively redirecting the sequence of multi-scale random patterns from the direct optical path and along a deflection path;
• a nonplanar deflection screen disposed at an angle incident to the object surface to receive redirected multi-scale random patterns along the deflection path and providing further deflection thereof onto the object surface;
• and
• digital camera stereo pair means disposed facing the object surface in a direction substantially parallel to the direct optical path of said digital projector and calibrated therewith for capturing reflected images of the sequence of multi-scale random patterns projected directly onto the object surface combined with the redirected patterns deflected thereon.

An optical scanning method combining active stereo 3D reconstruction and deflectometry system techniques to acquire three-dimensional measurements of an object surface under inspection, comprising the steps of:

• projecting multi-scale random patterns along a direct optical path projected upon the object surface at a predetermined incident angle;
• projecting a sequence of non-calibrated light patterns along a second optical path apart from the first optical path for deflection onto the object surface;
• and
• capturing reflected images of the multi-scale random patterns projected on the object surface further combined with the sequence of deflected non-calibrated light patterns projected thereon.