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US 2006/0233453 A1Published application
Method of suppressing a periodical pattern in an image
AssigneeAgfa-Gevaert
InventorsGert Behiels, Pieter Vuylsteke
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Abstract
A short-time Goertzel transform is applied to the image signal to transform it into a representation of the spatial frequency component corresponding to the periodic pattern. This representation is processed. Next the inverse of the transformation is computed and the result of the inverse transformation is removed from the image signal.
Claims18
A periodical pattern suppression method wherein the spatial frequency component corresponding to a periodical pattern occurring in an image signal is suppressed, comprising the steps of
- extracting from said image signal the spatial frequency component corresponding to a periodical pattern included therein by applying a transformation to the image signal to transform it into a representation of the spatial frequency component,
- processing the representation of the spatial frequency component,
- computing the inverse of the transformation on the representation of the spatial frequency component,
- suppressing the spatial frequency component occurring in the image signal by eliminating from said image signal the result of said inverse transformation.
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