Patent ID: 8054517
Filing Date: 2011-11-08
Classification: H04N

Abstract:
1. An image processing apparatus comprising: an image scanning unit including a plurality of line sensors that correspond to different color components, the image scanning unit arranged to simultaneously scan different scanning positions on an original document at predetermined intervals in a sub-scanning direction; a scanning speed control unit arranged to control a scanning speed in the sub-scanning direction of the scanning positions based on a set scanning resolution; a scanned data combining unit arranged to combine, based on the scanning positions, each scanned data having a different color component from each scanned data output from the respective line sensors so as to generate pixel data; a color space conversion unit arranged to convert the pixel data into first chromaticity data and second chromaticity data; and an achromatic color determining unit arranged to determine whether or not the pixel data is achromatic; wherein the achromatic color determining unit includes a comparison unit arranged to compare an achromatic color determination area with the pixel data in a color space that is defined by orthogonal coordinates having the first chromaticity data and second chromaticity data as coordinate axes; the achromatic color determination area is an elongated area that includes a coordinate origin of the color space, that is set based on a coordinate position of a false color, and that extends in a direction substantially opposite from the coordinate origin; and the false color is acquired by using a size and position of displacement of the scanning position of each color component generated in accordance with the scanning speed.