Patent Number: 8,792,134

Title: Data generation method and data generation apparatus

Abstract: Conventional calibration patches are designed such that gradation values of the patches are determined, based on the overall length of a trajectory of a monochrome ink color in an L*a*b* space, so that distances between patches become uniform, and therefore provide low interpolation accuracy in a region where measurement values change non-linearly in accordance with the change in gradation. According to the present invention, gradation values of patches to be used for color calibration are determined so that the patches are closely arranged in a region where measurement values change non-linearly in accordance with the change in gradation. Thus, interpolation accuracy can be improved in a region where measurement values change non-linearly.

Inventors: Omagari; Yuki (Tokyo, JP), Uratani; Mitsuru (Kawasaki, JP), Ishida; Yuki (Kawasaki, JP), Hiyama; Yutaka (Yokosuka, JP), Obayashi; Masaaki (Kawasaki, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: G06K 15/00 (20060101); H04N 1/46 (20060101); G03F 3/08 (20060101); H04N 1/60 (20060101); G06K 9/00 (20060101)

Expiration Date: 7/29/12018