Title:
画像読取装置
Document Type and Number:
Japanese Patent JP6918481
Kind Code:
B2
Abstract:
Provided is an image reading apparatus, including: a reading unit configured to read an original image of an original placed on an original table for each line in a main scanning direction; and a control unit. The control unit is configured to derive, from the original image read for a predetermined number of lines by the reading unit, a luminance difference value between luminance values of two pixels each separated by a first distance from a pixel of interest that is located at a predetermined position in the main scanning direction, and a difference value between a maximum luminance value and a minimum luminance value of pixels within a range of a second distance, which is larger than the first distance, from the pixel of interest.
Inventors:
Shimizu Hiromu
Application Number:
JP2016244048A
Publication Date:
August 11, 2021
Filing Date:
December 16, 2016
Export Citation:
Assignee:
Canon Inc
International Classes:
H04N1/04; H04N1/10
Domestic Patent References:
| JP2001217998A | ||||
| JP10224563A | ||||
| JP2004159240A |
Attorney, Agent or Firm:
Masatake Suzuki