Patent ID: 7663787
Filing Date: 2010-02-16
Classification: H04N

Abstract:
1. A document deciding apparatus comprising: a light source; a light-quantity detection unit that detects a reference light quantity based on irradiation of the light source, and respective light quantities of plural colors based on reflection from or transmission through a document; a control unit that, on the basis of a change of the detected reference light quantity, alters one of (i) a criterion for deciding whether the document is colorless or colored and (ii) values which corresponds to the light quantities of plural colors based on reflection from or transmission through a document, a decision unit that decides whether the document is colorless or colored, wherein, in case of altering the criterion, the decision unit decides on the basis of the adjusted criterion and the light quantities of plural colors based on reflection from or transmission through the document, and in case of altering the value, the decision unit decides on the basis of the respective altered values and a predetermined criterion for deciding whether the document is colorless or colored.