Sharpening filter for images with automatic adaptation to image

Details Sharpening filter for images with automatic adaptation to image Sharpening filter for images with automatic adaptation to image

1996-12-27

1998-10-13

Rogers, Scott

Image analysis

Image enhancement or restoration

Image filter

382263, G06K 936, C06T 500, H04N 1409

Patent

active

058224670

ABSTRACT:
A method of filtering images with a filter that is dependent on image type. For binary images, a fixed Laplacian filter is used for all pixels. For non-binary images, an automatic level-sensitive Laplacian filter is used. For non-binary images, 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 to 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: 5245445 (1993-09-01), Fujisawa
patent: 5381490 (1995-01-01), Shin
patent: 5485534 (1996-01-01), Takemoto et al.
patent: 5497249 (1996-03-01), Koizumi et al.

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