Image analysis – Histogram processing – For setting a threshold
Patent
1989-10-27
1990-12-04
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
324647, 340568, G06K 900, G01R 2704
Patent
active
049759680
ABSTRACT:
Dielectrometry monitoring method and apparatus for three-dimensional profiling and colorable imaging of the material contents of articles carried on a conveyor through an interrogation region are disclosed. In a preferred embodiment, the apparatus includes a plural, stationary, collimated, microwave transmitter/receiver antennae array and associated electronics for measuring the dielectric constant of the materials to produce data for interpretation in real time as to the article's dielectric material configuration and contents. High-speed, GaAs gates and switching devices, as well as microstrip delay lines, are used to perform the precisely timed, depth-wise sampling of data reflective of dielectric-constant material characteristics, with sampling periods in the sub-nanosecond range. By comparison to predefined criteria, computerized analysis determines whether the data profile of the material within the interrogation region is indicative of any of a variety of contraband or hazardous conditions, including narcotic drugs and explosives. In the preferred embodiment of the invention, one each of such collimated arrays is positioned above and below the article-carrying conveyor in order to avoid potential blind spots that may be caused by conductive structures within an article.
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Boudreau Leo H.
Dinh Tan
Spatial Dynamics, Ltd.
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