Title:
SURVEILLANCE SYSTEM
Document Type and Number:
WIPO Patent Application WO/2017/195753
Kind Code:
A1
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.
Inventors:
FUJITA JUNICHI (JP)
Application Number:
PCT/JP2017/017464
Publication Date:
November 16, 2017
Filing Date:
May 09, 2017
Export Citation:
Assignee:
KONICA MINOLTA INC (JP)
International Classes:
G01S7/487; G01C3/06; G01S17/88; G08B13/181
Domestic Patent References:
| WO2016002776A1 | 2016-01-07 |
Foreign References:
| JP2012255657A | 2012-12-27 | |||
| JP2007122508A | 2007-05-17 | |||
| JP2012022573A | 2012-02-02 |
Attorney, Agent or Firm:
TAMURA Keijiro et al. (JP)
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