Title:
空間依存色域マッピングにおけるハローの低減
Document Type and Number:
Japanese Patent JP4249034
Kind Code:
B2
Abstract:
A method and apparatus for color image processing using gamut mapping reduces halo artifacts by correcting terms in a gamut mapping algorithm. The color image may be represented by f, the in gamut image by g, the target gamut by C, and the gamut constraint by c. The method for reducing halo artifacts includes two correction steps. First a color distance term L2 in the gamut mapping algorithm is corrected. Second, a distance measure of an image gradient in the gamut mapping algorithm is corrected. The first correcting step comprises computing a function u=projectC(f). The second correcting step comprises computing a scaled down function for f. Next, a function g(x,y) is determined that minimizes a functional comprising the color distance term and the image gradient term. The solution may be determined by iteration using a gradient descent operation by first initializing g0=projectC(f), and then performing one or more iteration steps to compute g(x,y).
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Inventors:
Avraham Levy
Delon Sheiked
Delon Sheiked
Application Number:
JP2003577530A
Publication Date:
April 02, 2009
Filing Date:
March 13, 2003
Export Citation:
Assignee:
HEWLETT-PACKARD COMPANY
International Classes:
G06T1/00; H04N1/46; H04N1/60
Domestic Patent References:
| JP2001169136A |
Attorney, Agent or Firm:
Patent Business Corporation IPS