COLOR EVALUATION DEVICE, COLOR EVALUATION METHOD, AND INDICATION OBJECT USED IN COLOR EVALUATION METHOD

Title:

COLOR EVALUATION DEVICE, COLOR EVALUATION METHOD, AND INDICATION OBJECT USED IN COLOR EVALUATION METHOD

Document Type and Number:

WIPO Patent Application WO/2020/049779

Kind Code:

A1

Abstract:

In the present invention, a calculation device (6) comprises a color evaluation unit (62) that acquires a sensor color and four or more reference colors from photography data from a measurement time when an indication object (7) was photographed in a second photography environment; determines coefficients for color conversion between a first photography environment and the second photography environment on the basis of the amounts of change from color information for the four or more reference colors in the first photography environment, which has been read from a calculation device storage unit (61), to color information for the four or more reference colors in the second photography environment, which has been acquired from the photography data; and uses the sensor color acquired from the photography data from the measurement time and the color conversion coefficients to correct the sensor color to the color that would have been photographed in the first photography environment by solving a conversion formula including terms representing an affine transformation consisting of translation.

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Inventors:

SUWA YUJI (JP)
AIDA KOHHEI (JP)
MORI SHUNSUKE (JP)
TSUBOUCHI SHIGETAKA (JP)
KAWASAKI MASAHIRO (JP)
SEKIGUCHI YOSHIFUMI (JP)

Application Number:

PCT/JP2019/011936

Publication Date:

March 12, 2020

Filing Date:

March 20, 2019

Export Citation:

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Assignee:

HITACHI LTD (JP)

International Classes:

G01J3/46; G01J3/52; G01K11/12; G01N21/27; G01N21/78; G06T1/00; G06T7/90; H04N1/60

Domestic Patent References:

WO2016163266A1

2016-10-13

Foreign References:

JP2012093277A	2012-05-17
JP2004135069A	2004-04-30
JP2007259123A	2007-10-04
JP2015207085A	2015-11-19
US20150241358A1	2015-08-27
JP2010281728A	2010-12-16
JP2007101482A	2007-04-19

Attorney, Agent or Firm:

ISONO INTERNATIONAL PATENT OFFICE, P.C. (JP)

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