Patent ID: 8879057
Filing Date: 2014-11-04
Classification: B41F,G01J,G01N,H04N

Abstract:
1. A spectral characteristic acquiring apparatus, comprising: an area dividing part that divides a reflected light beam into plural areas with plural apertures, the reflected light beam being generated based on a light beam radiated from a light radiating part to an image carrying medium; a spectrum separating part that performs a spectrum separation of the reflected light beams divided by the area dividing part to form plural diffraction patterns; a light receiving part that receives the diffraction patterns formed by the spectrum separating part with plural pixels to convert the received diffraction patterns into electrical signals; and a calculating part that calculates, based on the electrical signals, a spectral characteristic that indicates a ratio of a light amount of the reflected light beam at plural locations of the image carrying medium, wherein the calculating part includes a transformation matrix storing part that stores a transformation matrix used for calculating the spectral characteristic corresponding to the electrical signals of a first diffraction pattern group including two or more adjacent diffraction patterns, a spectral characteristic calculating part that calculates, based on the electrical signals of the first diffraction pattern group and the corresponding transformation matrix, the spectral characteristic at the locations of the image carrying medium corresponding to the apertures of the first diffraction pattern group, a second transformation matrix storing part that stores a second transformation matrix used for calculating the spectral characteristic associated with the electrical signals of a second diffraction pattern group including two or more adjacent diffraction patterns, the number of the adjacent diffraction patterns included in the second diffraction pattern group being different from the number of the adjacent diffraction patterns included in the first diffraction pattern group; and a second spectral characteristic calculating part that calculates, based on the electrical signals of the second diffraction pattern group and the corresponding second transformation matrix, the spectral characteristic at the locations of the image carrying medium corresponding to the apertures of the second diffraction pattern group.