Speckle signatures of articulating humans

D. G. Conrad III; E. A. Watson

doi:10.1117/12.918922

7 May 2012 Speckle signatures of articulating humans

D. G. Conrad III, E. A. Watson

Proceedings Volume 8382, Active and Passive Signatures III; 83820E (2012) https://doi.org/10.1117/12.918922
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

Speckle is a well-investigated interference phenomenon that is produced by coherent light scattering off a rough surface. While speckle is often considered a noise source, it can be used to obtain information about the object. We investigate a non-imaging technique using speckle statistics to estimate object articulation. It is known that the speckle intensity in the far field depends on two factors: the illumination distribution at the object and the field correlation properties of the materials composing the object. It is anticipated that as an object articulates, perhaps periodically as in a person walking, the object illumination distribution, and therefore average speckle size in the far field, will vary in time. An estimate of the time variation of the average speckle size can then be used to estimate the motion of the object. In this paper we investigate, through simulation and lab experiments, the effect of object articulation on speckle statistics. We find that the motion of a person walking will produce a measurable variation in speckle statistics (intensity correlation function) and that the correlation function can be estimated from a single speckle realization.

Citation Download Citation

D. G. Conrad III and E. A. Watson "Speckle signatures of articulating humans", Proc. SPIE 8382, Active and Passive Signatures III, 83820E (7 May 2012); https://doi.org/10.1117/12.918922

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