Title:
IMAGE READING APPARATUS
Document Type and Number:
Japanese Patent JP2015142304
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an image reading apparatus in which a streak of gradation is prevented from being generated by sensitivity variance.SOLUTION: A CPU 3 calculates streak data Pd by subtracting full pixel average data Ps of gray zone image data from average data Pv in a sub scanning direction of the gray zone image data (S26). In the case where it is determined that background color data are not white (S35: NO), the CPU 3 executes streak correction processing for correcting vertical streaks of a manuscript M by using the streak data Pd (S36). Therefore, images of not only a white manuscript and a black manuscript but also of a halftone manuscript can be read without influence of sensitivity variance, and a streak of gradation can be prevented from being generated by sensitivity variance.
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Inventors:
SATO SEIYA
Application Number:
JP2014015199A
Publication Date:
August 03, 2015
Filing Date:
January 30, 2014
Export Citation:
Assignee:
BROTHER IND LTD
International Classes:
H04N1/401
Domestic Patent References:
| JPS63136770A | 1988-06-08 | |||
| JPH03145271A | 1991-06-20 | |||
| JP2003283825A | 2003-10-03 | |||
| JPH07162681A | 1995-06-23 |
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