Show simple item record

dc.contributor.authorAndrade, Rafael A.
dc.contributor.authorGilbert, Bernard R.
dc.contributor.authorDawson, Donald W.
dc.contributor.authorHart, Chris L.
dc.contributor.authorKozaitis, S.P.
dc.contributor.authorBlatt, Joel H.
dc.date.accessioned2017-10-05T17:26:51Z
dc.date.available2017-10-05T17:26:51Z
dc.date.issued1996-07-12
dc.identifier.citationAndrade, R. A., Gilbert III, B. S., Dawson, D. W., Hart, C., Kozaitis, S. P., & Blatt, J. H. (1996). Real-time optically processed face-recognition system based on arbitrary moire contours. Paper presented at the Proceedings of SPIE - the International Society for Optical Engineering, , 2754 198-207en_US
dc.identifier.urihttp://hdl.handle.net/11141/1768
dc.description3D shapes, Face recognition, Fresnel zone plates, Spatial light modulatorsen_US
dc.description.abstractA real-time diffraction based optical processed 3-D shape recognition system has been built and demonstrated. The system uses an Ar-ion laser interferometer to project variable spatial frequency structural illumination on 3 dimensional targets which are viewed by a camera. The video data is mixed with a computer generated mask (converted to RS-170 video) and the resulting output video signal is sent to a liquid crystal television (modified to function as a spatial light modulator) which is illuminated by a He-Ne laser. The video mixing process, based on a commercial Chroma-Key circuit, generates an arbitrary moire pattern which is a function of the 3 dimensional shape of the target (indicated by the distorted structured illumination) and of the computer generated mask. As an example, the output pattern could be a 1 dimensional Fresnel zone plate (FZP) when the shape of the object is recognized. In this case, the laser illuminated zone plate produces a bright line focus at the predicted focal distance for the correct target, a reduced intensity line focus for a damaged target, and no output for a totally different target. The result is a mixed video-optical processing system that could be used for real-time quality level sorting or other automated inspection requirements. Other types of diffractive masks are simulated with the goal of increasing the area of target inspection and recognizing and discriminating between different targets with a single mask. Limitations and improvements in the current system are discussed.en_US
dc.language.isoen_USen_US
dc.rightsThis published article is made available in accordance with publishers policy. It may be subject to U.S. copyright law.en_US
dc.rights.urihttp://spie.org/publications/journals/guidelines-for-authors#Terms_of_Useen_US
dc.titleReal-time optically processed face-recognition system based on arbitrary moire contoursen_US
dc.typeConference Proceedingen_US
dc.identifier.doi10.1117/12.243128


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record