Patent ID: 7826682

Claim:
A periodical pattern suppression method wherein a spatial frequency component corresponding to a periodical pattern occurring in an image signal is suppressed, comprising the steps of: extracting, via a radiography processing computer, from said image signal the spatial frequency component corresponding to the periodical pattern included therein by applying a transformation to the image signal to transform it into a representation of the spatial frequency component; processing, via the radiography processing computer, the representation of the spatial frequency component; computing, via the radiography processing computer, the inverse of the transformation on the processed representation of the spatial frequency component; and suppressing, via the radiography processing computer, the spatial frequency component occurring in the image signal by eliminating from said image signal the result of said inverse transformation, wherein said transformation is defined by a formula Γ( y ,ω)=∫ w ×( x−y )× s ( x )× e iωx dx wherein s(x) is said image signal, ω represents a given frequency of the periodical pattern, and wherein said processing comprises applying a non-linear high frequency attenuating filter to the representation of the spatial frequency component.