Chrominance smoothing
AssigneeSharp Laboratories of America, Inc.
InventorKristine E. Matthews
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Abstract
A method for reducing chrominance entropy in a digital color image. This method is practiced in relation to pixels in the two chrominance channels in a luminance-chrominance-chrominance representation of the image. The method involves shifting the chrominance values of selected low-luminance or high-luminance pixels toward (or to) another chrominance value which will result in a net chrominance entropy reduction in the subject channel.
Claims9
A method for chrominance smoothing a digital color image which is characterized by a luminance-chrominance-chrominance channel-color-space representation, said method comprising
- selecting an image region for smoothing attention,
- within that region further selecting pixels therein which have a luminance value that is on one side, in value, of a defined luminance threshold value, and
- changing the chrominance-channel values of such selected pixels so as to lower associated chrominance-channel entropy.
Dependencies are inferred from the claim text.