Image sharpening filter providing variable sharpening dependent

Details Image sharpening filter providing variable sharpening dependent Image sharpening filter providing variable sharpening dependent

1996-12-27

1998-12-29

Rogers, Scott

Image analysis

Image enhancement or restoration

Image filter

382263, G06T 500

Patent

active

058548599

ABSTRACT:
An automatic level-sensitive Laplacian filter for image processing. Laplacian filter coefficients and normalization divisors are made a function of intensity on a pixel by pixel basis. Pixels indicating a high intensity may be greatly changed by neighboring pixels. Pixels indicating a low intensity receive relatively little or no filtering. In a specific example embodiment, the intensity range is divided into bands, with a different filter for each band. The resulting images are visually sharpened (edge enhanced) with very little impact in darker areas of the image.

REFERENCES:
patent: 4568977 (1986-02-01), Chamberlain et al.
patent: 5113365 (1992-05-01), Yang
patent: 5343283 (1994-08-01), Dorsselaer et al.
patent: 5481628 (1996-01-01), Ghaderi

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