Imaging system and method regarding three dimensional imaging based on light triangulation

A method for supporting reduction of distortions in three dimensional imaging based on light triangulation, said three dimensional imaging being performed by an imaging system comprising a camera and a light source for providing illumination of an object to be imaged, wherein the illumination comprises structured light used in the light triangulation, the camera being arranged in relation to the provided structured light so that the camera during imaging captures reflected structured light from the object in an image as part of said light triangulation whereby, according to the light triangulation, positions of captured reflected structured light in the image map to real world positions where the structured light was reflected by the object, the structured light intersecting a virtual volume comprising the object and that corresponds to a volume where one or more objects, including said object, that the imaging system is configured to image are present during the imaging, wherein the method comprises:

• at least during said imaging by the camera, preventing stray light from the light source to reach the virtual volume within field of view of the camera, wherein said preventing stray light is accomplished by shielding the stray light by a light shield arranged outside the structured light between the light source and said virtual volume with:
• distance to the structured light such that the light shield thereby avoids shielding light of the illumination closer to the structured light than where the illumination has decreased to 5% of its maximum intensity;
• or
• distance to the structured light but so close that the light shield at least shields light of the illumination where the illumination has decreased to 1% of its maximum intensity.

An imaging system for three dimensional imaging of an object based on light triangulation, comprising a camera and a light source configured to provide an illumination of the object comprising structured light, the camera being arranged in relation to the provided structured light so that the camera is able to capture reflected structured light from the object in an image as part of said light triangulation whereby, according to the light triangulation, positions of captured reflected structured light in the image map to real world positions where the structured light was reflected by the object, the structured light intersecting a virtual volume comprising the object—and that corresponds to a volume where one or more objects, including said object, that the imaging system is configured to image are present during the imaging, wherein the imaging system further comprises a light shield arranged outside the structured light between the light source and said virtual volume such that the light shield shields stray light from the light source and thereby prevents it from reaching the virtual volume within field of view of the camera, and wherein the light shield is arranged outside the structured light with distance to the structured light but so close that the light shield at least shields light of the illumination where the illumination has decreased to 1% of its maximum intensity.