The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 07, 2020
Filed:
Nov. 28, 2017
Seiko Epson Corporation, Tokyo, JP;
Hideaki Kasahara, Matsumoto, JP;
Seiko Epson Corporation, , JP;
Abstract
A shading correction device includes a reference acquirer that acquires a reference pixel value W in a captured image of a color measurement reference object, a target pixel value acquirer that acquires a pixel value S in a captured image of a measurement target, a bit shift value acquirer that acquires a bit shift value k2 based on the reference pixel value W, a lookup table storing a variable G(=2/W>>k2) corresponding to W>>k2, and a calculator that reads the variable Gcorresponding to the reference pixel value W and the bit shift value k2 from the lookup table and calculates a shading correction value Rof each pixel in the captured image of the measurement target using Expression (5): and A, B and k1 are integer constants.