Photometric Stereo for 3D Surface Inspection

New Euresys Easy3D Tool for Photometric Stereo

The large majority of machine vision applications are solved using two-dimensional imaging, machine vision applications using or requiring 3D measurement and inspection are growing significantly. Numerous techniques are used for extracting 3D information from scenes. Let’s mention structured light (including laser-scanning based triangulation), stereo or stereoscopic vision and time of flight sensors.

One, probably lesser known, of these techniques is Photometric Stereo. Euresys’ Photometric Stereo function estimates the orientation and albedo of each point of a surface by acquiring several images of the same surface taken from a single viewpoint but under illumination from different directions. The different images are acquired in sequence, in synchronization with the lighting, thus requiring only one camera.