Method and apparatus for enhancing detail in an image
AssigneeThomson Licensing
InventorsKeping Chen, Jurica Ivisic, Ronald Edward Alspaugh
Life of this patent
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Abstract
The detail in an image can be enhanced by selective filtering to separate at least one part of the frequency spectrum of the image from a remaining part of the image. The amplitude of the separated part of the frequency spectrum of image is changed and the amplitude-changed portion is combined with the remaining part of the image. The filtering and/or the change in amplitude is controlled at least in part in response to the content of the image to enhance the detail level of the image where appropriate, while preventing enhancement in areas of the picture where it is likely that artifacts would be generated.
Claims20
Apparatus for enhancing the appearance of details in an image having a frequency spectrum, comprising:
- a separator for separating at least one part of the frequency spectrum of the image from a remaining part of the image;
- an amplitude-changing element for changing the amplitude of said at least one separated part of the frequency spectrum of the image;
- a combiner for combining said changed part of the frequency spectrum of the image with the remaining part of the image, and
- a controller responsive to the content of the image for controlling at least one of:
- (a) the separator, and (b) the amplitude-changing element to vary the part of the frequency spectrum separated from the remaining part of the image and the amount of the change in amplitude the one separated part prior to said combining, respectively.
A method for enhancing the appearance of details in an image having a frequency spectrum, comprising the steps of:
- separating at least one part of the frequency spectrum of the image from a remaining part of the image;
- changing the amplitude of said at least one separated part of the frequency spectrum of the image;
- combining said changed part of the frequency spectrum of the image with the remaining part of the image, and
- controlling at least one of:
- (a) the separation of the one part of the frequency spectrum, and (b) the change in amplitude at least in part in response to the content of the image to vary at least the part of the frequency spectrum separated from the remaining part of the image and the amount of the change in the amplitude the one separated part, respectively, prior to said combining.
Dependencies are inferred from the claim text.