Resources Contact Us Home
Signal processing for object detection system

Image Number 16 for United States Patent #6243036.

Methods and apparatus for detecting objects are disclosed. In one embodiment of the invention, a person entering a secured or "Safe Zone.TM." is illuminated with low-power polarized radio waves. Differently polarized waves which are reflected back from the person are collected and measured. In a preferred embodiment of the invention, concealed weapons are detected by calculating the difference of a pair of differences between levels of different polarized reflected energy in the time domain, and by using signal processing methods and apparatus to improve the reliability of the detection process. Alternative embodiments of the invention may be used to detect a wide variety of objects other than concealed firearms. The invention may be used for inventory control or to thwart shoplifting.

  Recently Added Patents
Method of and apparatus for recording motion picture, which generate encoded data with higher compression efficiency using a motion vector similarity
Modular storage system
Writing implement
Generating package profiles in software package repositories using selective subsets of packages
Focus detection device and imaging apparatus having the same
Wire guide
Protein purification
  Randomly Featured Patents
Apparatus for positively connecting two overlapping band portions
Retractable calibration strip for a digital printer or image scanner
(Hf.sub.1-x Zr.sub.x).sub.3 P.sub.2 O.sub.11 luminescent material, method of preparation and X-ray intensifying screen containing same
Method of providing electrical contact to a semiconductor cathode, cathode so produced, and electron tube provided with such cathode
Eluting coils and methods of deploying and retrieving
Universal projector mount
Method to form an insulative barrier useful in field emission displays for reducing surface leakage
Acceleration sensor having an electrode bridge
Substituted phenoxyalkyl quaternary ammonium compounds as antiarrhythemic agents
Nestable trolley with volume regulation