Method for color cast removal in scanned images

Details Method for color cast removal in scanned images Method for color cast removal in scanned images

2008-03-18

2008-03-18

Lamb, Twyler (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003030, C358S518000, C345S589000, C345S591000, C382S167000, C382S163000

Reexamination Certificate

active

07345786

ABSTRACT:
A method for color cast removal in a scanned image in L*a*b* space includes generating a first color cast correction curve for mapping L* to a first color correction, Δa*, (or Δb*) wherein the first correction curve provides a desired a* shift in midtone regions and is modulated as a function of L* such that black and white points are unaffected; for each pixel n in the scanned image, passing L*nthrough the first color cast correction curve for obtaining a value of Δa*n; and adding the value of Δa*nto the scanned image's original a*ncomponent. To ensure that the color corrected a* remains within gamut, a second correction curve for applying a clipping factor to the mapped Δa* may be generated with the a*npassing through the second correction curve for obtaining a clipping factor Cn; and modifying the a*nvalue by Cn(Δa*n).

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