US 12,033,356 B2
Coefficient determination device, pigment concentration calculation device, coefficient determination method, and non-transitory computer-readable storage medium
Ryota Tomizawa, Sakai (JP); Yoshihisa Adachi, Sakai (JP); Yuki Edo, Sakai (JP); and Rieko Ogawa, Sakai (JP)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Appl. No. 17/287,247
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
PCT Filed Oct. 4, 2019, PCT No. PCT/JP2019/039318
§ 371(c)(1), (2) Date Apr. 21, 2021,
PCT Pub. No. WO2020/090348, PCT Pub. Date May 7, 2020.
Claims priority of application No. 2018-204329 (JP), filed on Oct. 30, 2018.
Prior Publication US 2021/0383571 A1, Dec. 9, 2021
Int. Cl. G06T 7/90 (2017.01); G06T 7/00 (2017.01)
CPC G06T 7/90 (2017.01) [G06T 7/0012 (2013.01); G06T 2207/10024 (2013.01); G06T 2207/30088 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A coefficient determination device configured to determine, based on captured image data obtained by imaging a subject including one or more types of pigments, a plurality of coefficients included in a function used to calculate a concentration of a desired pigment in a specific region of the subject,
the captured image data being data obtained by using a predetermined imaging apparatus and having a plurality of types of luminance values representing luminances in respective wavelength bands, the function including the plurality of types of luminance values as a plurality of variables, each coefficient in the plurality of coefficients corresponding to a respective variable in the plurality of variables, and the plurality of coefficients being obtained in association with the predetermined imaging apparatus, the coefficient determination device comprising:
a response calculation unit configured to calculate at least one of following response modes:
a first response mode indicating a relationship between a change in a component concentration of a pigment other than the desired pigment and a change in each of the plurality of types of luminance values in the captured image data, and
a second response mode indicating a relationship between a change in a shade intensity and a change in each of the plurality of types of luminance values in the captured image data; and
a coefficient calculation unit configured to calculate the plurality of coefficients using at least one of the first and second response modes,
wherein the second response mode is represented as a shade vector including parameters as components respectively indicating degrees of changes in additive inverses of logarithms of the plurality of types of luminance values caused by the change in the shade intensity.