A structured-light-projection camera emits active optical radiation in the form of a coded structured light pattern in the visible or infrared spectrum, or electromagnetic radiation in the form of modulated laser light. Via the projected pattern, particular labels are assigned to 3D scene points which, in turn, may easily be decoded in images when imaging the scene and the projected pattern with a camera. The procedure reminds to conventional stereo processing, where corresponding features must be extracted from a pair of stereo images to derive the spatial information. In contrast, such synthetically generated features allow to robustly establish feature correspondences, and the respective 3D coordinates may easily and reliably be recovered via triangulation. Generally, techniques based on the use of structured light patterns may be classified depending on the pattern codification strategy.
Explain the principles of operation of the structured-light-projection camera
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