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Fast 3D NIR systems for facial measurement and lip-reading

: Brahm, A.; Ramm, R.; Heist, S.; Rulff, C.; Kühmstedt, P.; Notni, G.


Harding, K.G. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Dimensional Optical Metrology and Inspection for Practical Applications VI : 13 April 2017, Anaheim, California, United States
Bellingham, WA: SPIE, 2017 (Proceedings of SPIE 10220)
ISBN: 978-1-5106-0941-9
ISBN: 978-1-5106-0942-6
Paper 102200P
Conference "Dimensional Optical Metrology and Inspection for Practical Applications" <6, 2017, Anaheim/Calif.>
Conference Paper
Fraunhofer IOF ()

Structured-light projection is a well-established optical method for the non-destructive contactless three-dimensional (3D) measurement of object surfaces. In particular, there is a great demand for accurate and fast 3D scans of human faces or facial regions of interest in medicine, safety, face modeling, games, virtual life, or entertainment. New developments of facial expression detection and machine lip-reading can be used for communication tasks, future machine control, or human-machine interactions. In such cases, 3D information may offer more detailed information than 2D images which can help to increase the power of current facial analysis algorithms. In this contribution, we present new 3D sensor technologies based on three different methods of near-infrared projection technologies in combination with a stereo vision setup of two cameras. We explain the optical principles of an NIR GOBO projector, an array projector and a modified multi-aperture projection method and compare their performance parameters to each other. Further, we show some experimental measurement results of applications where we realized fast, accurate, and irritation-free measurements of human faces.