Colorimetric apparatus and colorimetric method

Patent metadata

Field	Value
Publication number	US-8947730-B2
Application number	US-201313782466-A
Country	US
Kind code	B2
Filing date	Mar 1, 2013
Priority date	Mar 27, 2012
Publication date	Feb 3, 2015
Grant date	Feb 3, 2015

Abstract

In an apparatus including an irradiation unit capable of irradiating a sheet selectively with visible light and ultraviolet light, and a measurement unit which measures a spectral reflectance based on light reflected by the sheet, whether to cause the irradiation unit to emit the ultraviolet light when measuring the spectral reflectance of a patch image printed on the sheet is determined based on the spectral reflectance of a reference image of the color of the sheet that has been measured by the measurement unit which measures a spectral reflectance while the ultraviolet light is emitted.

First claim

What is claimed is:

1. A colorimetric apparatus comprising:
an irradiation unit configured to irradiate a sheet selectively with visible light and ultraviolet light;
a measurement unit configured to measure a spectral reflectance based on light reflected by the sheet; and
a determination unit configured to determine, based on a spectral reflectance of a reference on the sheet that is measured by said measurement unit during an emission of the ultraviolet light, whether to caus…

Assignees

• Canon Kk

Inventors

• Miyazaki Toshiki

Classifications

• G01N21/86

  Physics · mapped topic

• G01J3/10

  Physics · mapped topic

• G01J2003/468

  Physics · mapped topic

• G01N21/89

  Physics · mapped topic

• G01J3/50

  Physics · mapped topic