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Tile based color space transformation

a color space and transformation technology, applied in the field of image processing arts, can solve the problems of one of the more computationally expensive functions of color images, and achieve the effects of improving image processing speed, saving computation time, and speeding up execution

Active Publication Date: 2020-09-17
XEROX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Significantly reduces computation time by at least an order of magnitude, improving processing speed and quality of color image conversions, such as from L*a*b* to CMYK, while maintaining image integrity.

Problems solved by technology

Color space transformations using methods and formulae more complex than 1D look up tables, such as for example and without limitation tetrahedral interpolation, are one of the more computationally expensive functions in color image path for digital copiers and multifunction devices.

Method used

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  • Tile based color space transformation
  • Tile based color space transformation
  • Tile based color space transformation

Examples

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Embodiment Construction

[0024]One or more embodiments will now be described with reference to the attached drawings, wherein like reference numerals are used to refer to like elements throughout. Aspects of exemplary embodiments related to systems and methods for color image printing are described herein. In particular, disclosed herein are embodiments utilizing a tile type based color space transformation to increase color image processing speed and efficiency, while improving output documents. In addition, example embodiments are presented hereinafter referring to color space conversion from L*a*b* to CMYK, and the like, however, application of the systems and methods set forth can be made in other areas, as will be appreciated by those skilled in the art.

Non-Limiting Definitions

[0025]A “gamut” is a subset of color values of a given color space as defined by the spectrum of light, i.e., the distribution of light energy versus wavelength, interacting with the spectral sensitivities of the eye's light rece...

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PUM

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Abstract

A system and method for tile type based color space transformation improves the performance and image quality of multifunction devices. The disclosed embodiments transform an input image on a tile by tile basis. If a tile is detected as neutral, simple 1D L* to CMYK Tone Reproduction Curves or Look-Up-Tables are used to convert the input pixels of the tile in L*a*b* to output pixels in CMYK. If a tile is detected as containing color content, then the input pixels are chrominance adjusted and subsequently converted to CMYK using regular tetrahedral interpolation.

Description

BACKGROUND[0001]The subject disclosure relates to the printing arts, the copying / scanning arts, the image processing arts, the color processing arts, spot color printing, and the like.[0002]While historically images were captured using photographic film, modern digital devices (such as scanners, cameras, etc.) capture images as pixels electronically, and most such digital devices capture images in a color space referred to as RGB, or red-green-blue color space. The RGB color space is utilized by image capture devices because such devices commonly include sensors that distinguish between the red, green, and blue colors.[0003]When processing images captured by digital devices to make color corrections, remove undesirable artifacts, improve image resolution, suppress background, prepare images for printing or display, etc. (which is sometimes referred to as image path processing) it is often useful to first convert the electronic images into a color space that is device independent, su...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04N1/60H04N1/58
CPCH04N1/6008H04N1/6005H04N2201/0094H04N1/58H04N1/6019H04N1/603
Inventor LI, XINGMCCANDLISH, PETERCUCIUREAN-ZAPAN, CLARA
Owner XEROX CORP
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