Title:
A lighting installation, an imaging device, the lighting method, and a reflective field determining device
Document Type and Number:
Japanese Patent JP6255931
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To estimate an area where a quantity of light of reflected light is large due to actual light emission without being influenced by a factor other than pre-light emission even if brightness of an object changes by the factor other than the pre-light emission between time before the preliminary light emission and time during the pre-light emission.SOLUTION: Differences in a luminance value of each color component (dR, dG, and dB) between illumination areas A11 and A21 are calculated on the basis of photometric information acquired before pre-light emission and that acquired during the pre-light emission. Likewise, differences in a luminance value of each color component between person areas A12 and A22 are calculated. A first ratio dR/dG and a second ratio dB/dG of the illumination areas A11 and A21 and those of the person areas A12 and A22 are calculated, and it is determined whether each calculation result is within a range from a lower limit to an upper limit acquired from ratios of the color components of the pre-light emission. As a result, it is determined that a person area is a reflected area where a quantity of light of reflected light by the pre-light emission is large.
Inventors:
Tomohiko Furukawa
Application Number:
JP2013238956A
Publication Date:
January 10, 2018
Filing Date:
November 19, 2013
Export Citation:
Assignee:
Ricoh Imaging Co., Ltd.
International Classes:
G03B15/05; G03B7/091; H04N5/232; H04N5/238
Domestic Patent References:
| JP2005065186A | ||||
| JP2005134468A | ||||
| JP2005037790A | ||||
| JP10301173A | ||||
| JP2013021658A | ||||
| JP2000155358A | ||||
| JP2002207159A | ||||
| JP2013044938A |
Foreign References:
| US20130016249 |
Attorney, Agent or Firm:
Takashi Matsuura
Hiroki Ogura
Hiroki Ogura