| 摘要 |
<p>The invention concerns a process and a device for determining the number of persons present in a given space by means of a small bar (14) of photodetectors (16) on which a lens (10) produces a linear image of a space containing objects or persons (12). The signals produced sucessively by the photodetectors (16) are compared by a microcalculator (22) in order to detect the movements of presons and to deduce therefrom the number of persons present. The invention is applicable in particular to the carrying out of automatic surveys of television audiences and to the surveillance of buildings.</p> |
