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Methods and apparatuses for addressing chromatic abberations and purple fringing

  • US 8,532,380 B2
  • Filed: 07/22/2011
  • Issued: 09/10/2013
  • Est. Priority Date: 01/28/2008
  • Status: Expired due to Fees
First Claim
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1. A processor-implemented method of correcting lateral chromatic aberrations in digital images within a digital image acquisition device, comprising:

  • acquiring a digital image;

    calculating corrected values for red (R) and blue (B) color channels as follows;

    R′

    =R+(G−

    R)×

    corR;

    B′

    =B+(G−

    B)×

    corB;

    where corR and corB are selected correction ratios for the red and blue color channels, respectively; and

    outputting, storing, displaying, projecting, or transmitting a corrected digital image which has been corrected for lateral chromatic aberrations, or a further processed version of the digital image, or combinations thereof, andwherein the selected correction ratios corR and corB comprise;


    CorR={CR=0.1×

    clamp([R(x,y)−

    RC(x,y)],10)}×

    CRB; and


    CorB={CB=0.1×

    clamp([B(x,y)−

    BC(x,y)],10)}×

    CRB;

    where clamp (.,.) returns second term when first term exceeds it; and


    CRB=1+cos [abs(Rc(x,y)−

    Bc(x,y))π

    /200], when abs(Rc(x,y)−

    Bc(x,y))<

    200; and


    CRB=0 when abs(Rc(x,y)−

    Bc(x,y))<

    200.

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