发明授权
- 专利标题: Method for color cast removal in scanned images
- 专利标题(中): 扫描图像中色彩去除方法
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申请号: US10368690申请日: 2003-02-18
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公开(公告)号: US07345786B2公开(公告)日: 2008-03-18
- 发明人: David E. Rumph , Charles M. Hains
- 申请人: David E. Rumph , Charles M. Hains
- 申请人地址: US CT Norwalk
- 专利权人: Xerox Corporation
- 当前专利权人: Xerox Corporation
- 当前专利权人地址: US CT Norwalk
- 代理商 Jeannette M. Walder
- 主分类号: G06F15/00
- IPC分类号: G06F15/00
摘要:
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*n through the first color cast correction curve for obtaining a value of Δa*n; and adding the value of Δa*n to the scanned image's original a*n component. 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*n passing through the second correction curve for obtaining a clipping factor Cn; and modifying the a*n value by Cn(Δa*n).
公开/授权文献
- US20040160615A1 Method for color cast removal in scanned images 公开/授权日:2004-08-19
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