Title:
黒レベルフィードバック装置、画像読取装置および黒レベルフィードバック制御方法
Document Type and Number:
Japanese Patent JP4568690
Kind Code:
B2
Abstract:
A first set-value calculating unit (161) calculates a first set value of a black-level feedback based on a reflection amount that increases a speed of tracking to a black-level target value in a black-level feedback control. A second set-value calculating unit (162) calculates a second set value of a black-level feedback based on a reflection amount that slows down a tracking to a black-level target value as compared to the speed of tracking of the first set-value calculating unit (161). A selecting unit (164) selects and outputs any one of the first set value and the second set value and outputs selected value as a set value. A controlling unit (163) controls selection of any one of the first set value and the second set value by the selecting unit (164) based on the black differential value and a gain of the image data.
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Inventors:
Moto Tsukahara
Application Number:
JP2006075555A
Publication Date:
October 27, 2010
Filing Date:
March 17, 2006
Export Citation:
Assignee:
株式会社リコー
International Classes:
H04N1/028; G06T1/00; H04N1/19; H04N1/407
Domestic Patent References:
| JP2004015094A | ||||
| JP2002057899A | ||||
| JP2003116003A |
Attorney, Agent or Firm:
Hiroaki Sakai