Patent ID: 9103666
Filing Date: 2015-08-11
Classification: G01B,G06T

Abstract:
1. A 3D scanner comprising: a camera comprising an image sensor, the image sensor comprising pixels sensitive in the visible optical band and pixels sensitive in the infrared optical band; a fixed pattern projector comprising a single fixed pattern mask, a plurality of visible light sources behind the single fixed pattern mask, and a plurality of infrared light sources behind the single fixed pattern mask; wherein said camera is configured to project patterns in the visible optical band on an object, project patterns in the infrared optical band on the object, acquire a plurality of visible images of the object, acquired a plurality of invisible images of the object, the camera further configured to simultaneously acquire a visible image and an infrared image; wherein the plurality of infrared light sources comprises three infrared light emitting diodes placed at distances D/3; and wherein the scanner is configured to vary the transparency of the single fixed pattern mask with a sine-function having a period D and the scanner is configured to sequentially switch between the three infrared light sources such that the sequential switching results in sequential projection of three sine-modulated patterns, mutually shifted by 2π/3.