A method of deriving from an existing selective image smoothing filter either a corresponding filter for selective image sharpening, or a corresponding filter for both selective smoothing and selective image sharpening. The selective sharpening filter can be implemented quickly by using implementations...http://www.google.com/patents/US6665448?utm_source=gb-gplus-sharePatent US6665448 - Selective smoothing and sharpening of images by generalized unsharp masking
