Title:
監視システム
Document Type and Number:
Japanese Patent JP6835079
Kind Code:
B2
Abstract:
Provided is a surveillance system in which errors in detecting an object according to a background subtraction method are reduced by setting appropriate background pixel values according to the characteristics of distribution of variations in measurement distances for each pixel. In this surveillance system, as a surveillance preprocessing, a processing section: obtains n distances from a light projection/reception unit to a target by executing scanning n times, and executes statistical processing; and, if the standard deviation σ is less than a threshold σth, employs the median value of the n pieces of distance values as the background pixel value, and if the standard deviation σ is greater than or equal to the threshold σth, employs the minimum value among the n pieces of distance values as the background pixel value. During surveillance of a target, the processing section: finds a distance value by measuring reflected light from the surveillance space; and recognizes a surveillance target if the found distance value is smaller than the background pixel value obtained by measuring the reflected light in the same light projection/reception direction.
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Inventors:
Junichi Fujita
Application Number:
JP2018517019A
Publication Date:
February 24, 2021
Filing Date:
May 09, 2017
Export Citation:
Assignee:
Konica Minolta Co., Ltd.
International Classes:
G01S7/487; G01C3/06; G01S17/89; G08B13/181
Domestic Patent References:
| JP2012255657A | ||||
| JP2007122508A | ||||
| JP201222573A |
Foreign References:
| WO2016002776A1 | ||||
| US20150317781 |
Attorney, Agent or Firm:
Keijiro Tamura
Kenichi Kobayashi
Kenichi Kobayashi