Method for random point and patterned noise reduction in...

Details Method for random point and patterned noise reduction in... Method for random point and patterned noise reduction in...

2003-11-26

2009-11-24

Strege, John B (Department: 2624)

Image analysis

Image enhancement or restoration

C380S260000, C380S261000, C380S262000

Reexamination Certificate

active

07623723

ABSTRACT:
A technique is provided for filtering noise in digital image data, particularly random point or spike noise. Image data may be rank order filtered and absolute differences between ordered values computed to create a mask. Blending is performed based upon a likelihood that individual pixels are or exhibit spike noise. The rank order filtered values may be used directly for blending, or the original image may be shrunk and then expanded to provide a rapid and computationally efficient spike noise reduction alternative.

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