Method of correcting color image data according to correction table
March 14, 2023. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesColor image reproduction apparatus having a digitally operated look-up table constructed by means of a least squares algorithm Color converting apparatus for performing a three-dimensional color conversion of a colored picture in a color space with a small capacity of memory High speed color compensation system Color conversion device Image processing apparatus and image processing method Image processing apparatus and image forming apparatus Image processing apparatus using an offset correction table enabling interpolation to be performed without conditional jumps Color converting apparatus and method Image processing apparatus and method therefor Image processing apparatus capable of precise color correction with reduced memory capacity InventorAssigneeApplicationNo. 10390063 filed on 03/14/2003US Classes:358/1.9, Attribute control358/3.23, Look-up table for image processing or print attribute data (e.g., threshold value, print element property)358/518, Color correction382/167, Color correction358/523, With memory for storage of conversion data382/300, Interpolation358/501, Image reproduction358/2.1, Processing based on at least two different image attributes (e.g., character, graphic, photo, line, edge, gray-level, color)347/13Full-line arrayExaminersPrimary: Nguyen, MadeleineAttorney, Agent or FirmForeign Patent References
International ClassesG06F 15/00G06K 3/23 G03F 3/08 AbstractThe technique of the present invention allocates a coordinate point of target image data on a color space to multiple lattice points in a color conversion table and reads data stored at the multiple lattice points. This arrangement ensures high-speed color conversion of the target image data. The procedure selects multiple lattice points and allocates a coordinate point of one target image data to the selected multiple lattice points. The procedure then specifies color-converted image data corresponding to the target image data, based on data read from the multiple lattice points. A first application allocates the target image data to the coordinate points of the multiple lattice points arbitrarily selected in the vicinity of the target image data. A second application allocates N-dimensional target image data to the coordinate points of multiple but not greater than N lattice points. A third application calculates an arithmetic mean of the data read from the multiple lattice points to specify the color-converted image data. Any of these arrangement effectively enhances the conversion accuracy without increasing the size of the color conversion table.Other References
Field of SearchAttribute controlColor correction With memory for storage of conversion data Look-up table for image processing or print attribute data (e.g., threshold value, print element property) Measuring, testing, and calibrating Matrix Memory Detail of image placement or content STATIC PRESENTATION PROCESSING (E.G., PROCESSING DATA FOR PRINTER, ETC.) Size, resolution, or scale control Color correction COLOR IMAGE PROCESSING | |
