| 摘要 |
A device for counting people or objects in a passageway including an information processing control until and an optical sensor positioned above the passageway, the optical sensor including two identical charge coupled modules which are linear and fixed parallel to each other and transversely to the passageway and separated from each other by a distance D enabling the processing unit to determine in real time an entering and leaving direction of each movement in the passageway and a total number of movements in the passageway, wherein the processing unit monitors the temporal evolution of background noise sensed by the optical sensor for extracting crude modifications due to the passage of a person or object.
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