Title:
INTERPHONE UNIT
Document Type and Number:
Japanese Patent JP3955781
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To conduct a predetermined operation by well sensing a visitor without using a human body sensing sensor even when any entrance is installed without selecting installing conditions.
SOLUTION: An infrared LED 4 is provided separately at a predetermined distance from a CCD 3b and a CCD 3b in an entrance unit 1, and an image processing unit 14 and a decision unit 15 are provided at a habitable room terminal 11. The LED 4 periodically emits a ray, calculates a difference between the image picked up at the LED 4 off time immediately before the emission and the image imaged at the emission time and specifies the position of a reflected ray arriving at the CCD 3a by reflecting on a matter to be reflected. A distance between the position of the specified ray and a center of an element of the CCD 3b is measured, and a distance between the matter to be reflected and the unit 1 is calculated by the processing unit 14. The calculated distance is compared with a preset reference distance by the decision unit 15, and if the calculated distance falls within the reference distance, it is determined that there is a visitor.
Inventors:
Kazuhiro Yasuda
Application Number:
JP2002086705A
Publication Date:
August 08, 2007
Filing Date:
March 26, 2002
Export Citation:
Assignee:
Aiphone Co., Ltd.
International Classes:
H04N7/18; H04M9/00; (IPC1-7): H04N7/18; H04M9/00
Domestic Patent References:
| JP2000244900A | ||||
| JP2504440A | ||||
| JP9289637A |
Attorney, Agent or Firm:
Yoshiki Ishida
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