Digital image processing method for edge shaping
AssigneeEastman Kodak Company
InventorsGina N. LaRossa, Hsien-Che Lee
Life of this patent
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Abstract
A digital image processing method, includes the steps of: transforming the digital image using an edge sensitive wavelet transform to produce a plurality of wavelet coefficients at various resolutions and a residual image; modifying the wavelet coefficients as a function of the image gradient and its rate of change at a resolution corresponding to the respective wavelet coefficient; and inverse transforming the modified wavelet coefficients and the residual image to produce a processed digital image.
Claims10
A digital image processing method, comprising the steps of:
- a) transforming a digital image using an edge sensitive wavelet transform to produce a plurality of wavelet coefficients at various resolutions and a residual image;
- b) modifying the wavelet coefficients as a function of the rate of change of the image gradient at a resolution corresponding to the respective wavelet coefficient, wherein the rate of change comprises an image gradient curvature that is computed by applying a Laplacian operator to the image gradient, thereby generating a modification factor that is invariant to scaling of the image;
- and
- c) inverse transforming the modified wavelet coefficients and the residual image to produce a processed digital image.
A computer program product for a digital image processing method comprising:
- a computer readable storage medium having a computer program stored thereon for performing the steps of:
- a) transforming a digital image using an edge sensitive wavelet transform to produce a plurality of wavelet coefficients at various resolutions and a residual image;
- b) modifying the wavelet coefficients as a function of the rate of change of the image gradient at a resolution corresponding to the respective wavelet coefficient, wherein the rate of change comprises an image gradient curvature that is computed by applying a Laplacian operator to the image gradient, thereby generating a modification factor that is invariant to scaling of the image;
- and
- c) inverse transforming the modified wavelet coefficients and the residual image to produce a processed digital image.
Dependencies are inferred from the claim text.