Method and apparatus for bilateral high pass filter

Details Method and apparatus for bilateral high pass filter Method and apparatus for bilateral high pass filter

2006-01-13

2009-10-06

Patel, Kanji (Department: 2624)

Image analysis

Image enhancement or restoration

Image filter

C382S279000

Reexamination Certificate

active

07599569

ABSTRACT:
A target pixel and surrounding pixels corresponding to the target pixel are obtained from a digitally represented image. A bilateral high pass filtering kernel is determined based at least in part upon the target pixel and the surrounding pixels. A high pass spatial filtering kernel is provided and multiplied with the high pass photometric filtering kernel to provide a bilateral high pass filtering kernel. The resulting bilateral high pass filtering kernel is thereafter applied to the target pixel and the surrounding pixels to provide a filtered pixel. When it is desirable to combine noise filtering capabilities with sharpening capabilities, the bilateral high pass filter of the present invention may be combined with a bilateral low pass filtering kernel to provide a combined noise reduction and edge sharpening filter. The present invention may be advantageously applied to a variety of devices, including cellular telephones that employ image sensing technology.

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