Patent ID: 6198841
Filing Date: 2001-03-06
Classification: G06T,H04N

Abstract:
An image processor comprising:an image scanner with a color image sensor for reading a color image and providing color data corresponding to the color image;a specification means for specifying a graduation characteristic of the color image;a means for changing a gradation characteristic of the color data according to the gradation characteristic of the color image specified by said specification means;a identifying means for identifying a black character portion of the color image based on the color data, the gradation characteristic of which has been changed by said changing means, said identifying means including:a first discriminating means for discriminating whether or not the color data belongs to an edge portion in the color image using a first reference value; anda second discriminating means for discriminating whether or not the color data belongs to a black portion in the color image using a second reference value;a controller which changes the first and second reference values according to the gradation characteristic of the color image specified by said specification means; anda correction means for correcting the color data, the gradation characteristic of which has been changed by said changing means, according to the identification by said identifying means.