Patent ID: 6320668
Filing Date: 2001-11-20
Classification: H04N

Abstract:
A color correction apparatus of an image system including a photoelectric conversion unit which radiates an illuminating light having a certain light emitting spectrum to an object and outputs spectral information regarding each of a plurality of colors reflected from said object after converting the spectral information into electrical signals, said apparatus comprising:first reference data storage means for storing reference gray level data and reference colorimetric data measured from an achromatic test pattern and a chromatic test pattern, respectively, of a preset test pattern by accumulating the data in a database system;correction coefficient calculating means for calculating a color correction coefficient matrix which reduces an error between colorimetric scanning data and said reference colorimetric data to minimum after receiving said colorimetric scanning data obtained by scanning said chromatic test pattern through said photoelectric conversion unit; andcolor correction means for receiving said color correction coefficient matrix from said correction coefficient calculating means, and for performing a linear transformation applying said color correction coefficient matrix to an output of said photoelectric conversion unit and then outputting a result after converting into a certain color coordinate system;wherein an achromatic color is divided equally on said achromatic test pattern at certain positions according to optical density, and wherein said chromatic test pattern uses a Macbeth color rendition chair on which a plurality of chromatic colors are divided equally at other positions.