PEOPLE-COUNTING SYSTEM USING MULTISENSING APPLICATION

A people-counting system with human information sensors using multisen sing application, which can be used for detecting the number of people passing a wide door and their movement directions, has been developed . The sensor head module of this sensing system consists of one-dimens ional eight-element array detectors fabricated by the sheet-forming me thod using pyroelectric PbTiO3 ceramics, an IR-transparent spherical l ens and oscillating mechanical chopping parts. This sensor head module is set at the top of the wide door with the element arrays parallel t o the movement directions of the passersby. The movement directions an d the number of continuously and/or simultaneously passing people can be obtained promptly based on digital output from the signal-processin g circuits. The sensor output is processed in real time to be normaliz ed and binarized by using the background mean method, and the number o f passing people and their directions of movement are recognized by a pattern-recognition algorithm. By using this people-counting system us ing multisensing application, the number of people passing by a 200 cm wide door can be detected with more than 95% accuracy. (C) 1998 Elsev ier Science S.A. All rights reserved.