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Method of improving a digital image as a function of its dynamic range

  • US 20030072496A1
  • Filed: 06/25/2001
  • Published: 04/17/2003
  • Est. Priority Date: 06/25/2001
  • Status: Active Grant
First Claim
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1. A method of processing a digital image, comprising the steps of:

  • providing digital data indexed to represent positions of an image having S spectral bands for simultaneous output on a display, said digital data being indicative of an intensity value Ii(x,y) for each position (x,y) in each i-th spectral band;

    defining a classification of said image based on dynamic range of said image in each of said S spectral bands;

    adjusting said intensity value for said each position in each i-th spectral band to generate an adjusted intensity value for said each position in each i-th spectral band in accordance with

    n=1N


    Wn

    (log





    Ii

    (x,y)
    -log

    [Ii

    (x,y)
    *Fn

    (x,y)
    ]
    )
    ,i=1,

    ,S
    where S is the number of unique spectral bands included in said digital data and, for each n, Wn is a weighting factor and Fn(x,y) is a unique surround function applied to said each position (x,y) and N is the total number of unique surround functions; and

    filtering said adjusted intensity value for said each position of said image in each of said S spectral bands using a filter function based on said classification of said image wherein a filtered intensity value Ri(x,y) is defined.

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