Method for correcting artefacts in a digital image
AssigneeAgfa-Gevaert
InventorsKoen Van de Velde, Pieter Vuylsteke
Life of this patent
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Abstract
A method of correcting artefacts in a processed digital image represented by a multi-scale gradient representation being obtained by non-linear processing of a multi-scale gradient representation of an original image. A modified gradient representation is generated by modifying gradient images of the multi-scale gradient representation of the processed image so that the directions of the gradient images are pixel-wise equal to those of the gradient images of the multi-scale gradient representation of the original image. A reconstruction algorithm is then applied to the modified gradient representation.
Claims9
A method of correcting artefacts in a processed digital image f represented by a multi-scale gradient representation V={{overscore (V)}0, . . . , {overscore (V)}K-1,SKf} comprising gradient images at multiple resolution levels and a residual image, said gradient representation being obtained by non-linear processing of a multi-scale gradient representation W={{overscore (W)}0f, . . . , {overscore (W)}K-1f,SKf} of an original image f, characterized by the steps of
- (i) generating a modified gradient representation by modifying the gradient images of V to make their directions pixelwise equal to those of W, and
- (ii) reconstructing a final output image from this modified gradient represented by applying an inverse multiscale gradient transform (IMG), said inverse transform being such that it yields f when being applied to W.
Dependencies are inferred from the claim text.