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US 6,640,017 B1Granted
Method and apparatus for adaptively sharpening an image
AssigneeIntel Corporation
InventorsPing-Sing Tsai, Yap-Peng Tan, Tinku Acharya
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Abstract
Briefly, in accordance with one embodiment of the invention, a method of sharpening an image includes the following. A crispening parameter is adaptively computed for a captured image based, at least in part, on a measure of the edges and brightness of the captured image. A kernel is applied to the captured image using the adaptively computed crispening parameter.
Claims32
A method of sharpening an image comprising:
- adaptively computing a crispening parameter for at least a portion of a captured image based, at least in part, on a measure of the edges and the brightness of the at least a portion of the captured image, comprising:
- computing a luminance value for the at least a portion of the captured image;
- computing a gradient magnitude value for the at least a portion of the captured image;
- and
- computing the crispening parameter based, at least in part, on, approximately, the relative values of the computed luminance value and the computed gradient
- magnitude value;
- and
- applying a kernel to the at least a portion of the captured image using the adaptively computed crispening parameter.
5 more elements
An article comprising:
- a storage medium;
- said storage medium having stored thereon, instructions, that, when executed, result in the following:
- adaptively computing a crispening parameter for at least a portion of a stored image based, at least in part, on a measure of the edges and the brightness of the at least a portion of the stored image, including:
- computing a luminance value for the at least of portion of the stored image;
- computing a gradient magnitude value for the at least a portion of the stored image;
- and
- computing the crispening parameter based, at least in part, on, approximately, the relative values of the computed luminance value and the computed gradient magnitude value;
- and
- applying a kernel to the at least a portion of the stored image using the adaptively computed crispening parameter.
6 more elements
A system comprising:
- a digital imager;
- said digital imager including the capability to adaptively compute a crispening parameter for at least a portion of a captured image based, at least in part, on a measure of the edges, the brightness of at least a portion of the captured image, including a relative magnitude of a pixel luminance and a pixel gradient magnitude.
Dependencies are inferred from the claim text.