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Apparatus and method for characterizing digital images using a two axis image sorting technique

  • US 7,233,696 B2
  • Filed: 07/12/2002
  • Issued: 06/19/2007
  • Est. Priority Date: 07/12/2002
  • Status: Expired due to Fees
First Claim
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1. A method of characterizing an M-column by N-row array of image pixels, said method comprising:

  • (1) reading the amplitudes of said pixels;

    (2) assigning column and row indices to said amplitudes;

    (3) organizing said amplitudes into segment amplitude sets for M columns and N rows;

    (4) organizing segment period sets for M columns and N rows(5) calculating mean value sets for said segment amplitude sets;

    (6) calculating standard deviation sets for said mean value sets;

    (7) using said mean value sets and said standard deviation sets to characterize said array of image pixels, and(8) determining registration errors through calculation of difference coefficients d(c) and d(r) defined by the following equations;


    D(c)=[Ma(c,A)−

    Ma(c,B)][Da(c,A)−

    Da(c,B)][Mt(c,A)−

    Mt(c,B)][Dt(c,A)−

    Dt(c,B)]
    D(r)=[Ma(r,A)−

    Ma(r,B)][Da(r,A)−

    Da(r,B)][Mt(r,A)−

    Mt(r,B)][Dt(r,A)−

    Dt(r,B)]where;

    Ma(c,X)=column amplitude mean axis function for image X, where “

    c”

    denotes a particular columnDa(c,X)=column amplitude deviation axis function for image X, where “

    c”

    denotes a particular columnMt(c,X)=column period mean axis function for image X, where “

    c”

    denotes a particular columnDt(c,X)=column period deviation axis function for image X, where “

    c”

    denotes a particular columnMa(r,X)=row amplitude mean axis function for image X, where “

    r”

    denotes a particular row,Da(r,X)=row amplitude deviation axis function for image X, where “

    r”

    denotes a particular row,Mt(r,X)=row period mean axis function for image X, where “

    r”

    denotes a particular row,Dt(r,X)=row period deviation axis function for image X, where “

    r”

    denotes a particular row.

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