Image sharpening with halo suppression

Image analysis – Image enhancement or restoration – Edge or contour enhancement

Reexamination Certificate

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C382S263000

Reexamination Certificate

active

07809208

ABSTRACT:
An image sharpening technique with halo suppression is presented. Generally, one implementation of this technique completely suppresses the haloing effect typically caused by image sharpening by restricting values to within the local minimum and maximum intensities of the unsharpened image. Thus, if the sharpened value is below the local minimum, it is replaced with the local minimum. Similarly, the local maximum is taken if the sharpened value exceeds it. In other implementations of the technique, haloing caused by image sharpening is suppressed but not completely eliminated, thereby producing a subtle haloing effect.

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