Method and apparatus for enhancing the edge contrast of an interpolated digital image
AssigneeEastman Kodak Company
InventorsAndrew C. Gallagher, Edward B. Gindele
Life of this patent
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Abstract
A method for enhancing a digital image channel, the method comprising the following steps: (a) providing a digital image channel having image pixels; (b) providing interpolation parameter values; (c) generating an interpolated digital image channel using the interpolation parameter values and the digital image channel; (d) generating edge shaper parameter values from the interpolation parameter values; and (f) generating an enhanced digital image channel from the interpolated digital channel by applying an edge shaping algorithm controlled by the edge shaper parameter values.
Claims43
A method for enhancing a digital image channel, the method comprising the following steps:
- (a) providing a digital image channel having image pixels;
- (b) providing interpolation parameter values;
- (c) generating an interpolated digital image channel using the interpolation parameter values and the digital image channel;
- (d) generating edge shaper parameter values from the interpolation parameter values;
- and
- (e) generating an enhanced digital image channel from the interpolated digital channel by applying a non-linear spatial filter edge shaping algorithm controlled by the edge shaper parameter values;
- further includes the step of identifying a pixel interest;
- calculating at least one statistical characteristic from image pixels corresponding to a region about said pixel of interest;
- using the statistical characteristic and the pixel of interest to calculate an enhanced output pixel;
- wherein the step of calculating the enhanced output pixel includes normalizing a predetermined tone scale function for the statistical characteristic in order to generate a normalized tone scale function;
- and
- applying the normalized tone scale function to the pixel of interest in order to generate the enhanced output pixel.
Apparatus for enhancing a digital image channel, comprising means for:
- (a) means for providing a digital image channel having image pixels;
- (b) means for providing interpolation parameter values;
- (c) means for generating an interpolated digital image channel using the interpolation parameter values and the digital image channel;
- (d) means for generating edge shaper parameter values from the interpolation parameter values;
- and
- (e) generating an enhanced digital image channel from the interpolated digital channel by applying an edge shaping algorithm controlled by the edge shaper parameter values;
- further includes the means for identifying a pixel of interest;
- means for calculating at least one statistical characteristic from image pixels corresponding to a region about said pixel of interest;
- and
- means for using the statistical characteristic and the pixel of interest to calculate an enhanced output pixel;
- wherein the means for calculating the enhanced output pixel includes means for normalizing a predetermined tone scale function for the statistical characteristic in order to generate a normalized tone scale function;
- and
- means for applying the normalized tone scale function to the pixel of interest in order to generate the enhanced output pixel.
Dependencies are inferred from the claim text.