US 12,078,543 B2
Color chart provided with patch and marker for recognizing patch
Masato Takahashi, Tokyo (JP); Yasuhiro Morihara, Tokyo (JP); Norimichi Tsumura, Chiba (JP); Ryo Takahashi, Chiba (JP); Keiko Ogawa, Ishikawa (JP); and Isseki Kin, Tokyo (JP)
Assigned to DIC Corporation, Tokyo (JP)
Appl. No. 18/010,596
Filed by DIC Corporation, Tokyo (JP)
PCT Filed Jun. 15, 2021, PCT No. PCT/JP2021/022641
§ 371(c)(1), (2) Date Dec. 15, 2022,
PCT Pub. No. WO2021/256458, PCT Pub. Date Dec. 23, 2021.
Claims priority of application No. 2020-104762 (JP), filed on Jun. 17, 2020; and application No. 2021-039110 (JP), filed on Mar. 11, 2021.
Prior Publication US 2023/0258501 A1, Aug. 17, 2023
Int. Cl. G01J 3/52 (2006.01); H04N 1/60 (2006.01)
CPC G01J 3/52 (2013.01) [H04N 1/6019 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A color chart comprising:
a plurality of patches; and
an automatic recognition marker configured to automatically recognize at least one of the plurality of patches, wherein
the plurality of patches include at least three patches selected from the group consisting of:
a first patch: a region that has a first color represented by an L*a*b* value in which L*=72, a*=8, and b*=22 or that has a color having a color difference ΔE* of 5 or less in an L*a*b* color space with respect to the first color;
a second patch: a region that has a second color represented by an L*a*b* value in which L*=78, a*=30, and b*=15 or that has a color having the color difference ΔE* of 5 or less in the L*a*b* color space with respect to the second color;
a third patch: a region that has a third color represented by an L*a*b* value in which L*=58, a*=27, and b*=7 or that has a color having the color difference ΔE* of 5 or less in the L*a*b* color space with respect to the third color;
a fourth patch: a region that has a fourth color represented by an L*a*b* value in which L*=60, a*=20, and b*=5 or that has a color having the color difference ΔE* of 5 or less in the L*a*b* color space with respect to the fourth color;
a fifth patch: a region that has a fifth color represented by an L*a*b* value in which L*=48, a*=25, and b*=2 or that has a color having the color difference ΔE* of 5 or less in the L*a*b* color space with respect to the fifth color;
a sixth patch: a region that has a sixth color represented by an L*a*b* value in which L*=52, a*=50, and b*=13 or that has a color having the color difference ΔE* of 5 or less in the L*a*b* color space with respect to the sixth color; and
a seventh patch: a region that has a seventh color represented by an L*a b* value in which L*=33, a*=40, and b*=30 or that has a color having the color difference ΔE* of 5 or less in the L*a*b* color space with respect to the seventh color.