Patent ID: 11968332
Assignee: CANON KABUSHIKI KAISHA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 15:
16. In information processing apparatus comprising:
a memory storing instructions; and
a processor that implements the instructions to:
obtain data of a reference image indicating a target of printing output to be performed by a printing apparatus;
obtain data of a printed image by reading an image printed by the printing apparatus;
generate difference data using:
a first image density difference between:
a pixel in a position of a pixel of interest in the reference image; and
a pixel in the position of a pixel of interest in the printed image; and
a third image density difference obtained by subtracting, from the first image density difference, a second image density difference between:
a region containing the pixel in the position of the pixel of interest in the reference image; and
a region containing the pixel in the position of the pixel of interest in the printed image; and

evaluate quality of the printed image based on the difference data.