Image analysis – Image enhancement or restoration – Artifact removal or suppression
Reexamination Certificate
2004-06-07
2008-09-30
Couso, Yon (Department: 2624)
Image analysis
Image enhancement or restoration
Artifact removal or suppression
C382S261000, C348S607000
Reexamination Certificate
active
07430337
ABSTRACT:
Ringing artifacts are removed from a quantized image by an image de-ringing filter that includes a determination unit, an adaptive filter and a nonlinear low-pass filter. The determination unit determines whether each selected pixel of a first set of selected pixels of an image contains a ringing artifact based on, for example, gray-level values of selected pixels within a determination kernel of pixels relating to the selected pixel. The adaptive filter generates a filtered gray-level value for each pixel determined by the determination unit to contain a ringing artifact based on, for example, gray-level values of selected pixels within a filtering kernel of pixels relating to the pixel. The nonlinear low-pass filter generates a low-pass-filtered gray-level value for each selected pixel of a second set of selected pixels of the image.
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Deshpande Sachin G.
Pan Hao
Couso Yon
Ripma David C.
Sharp Laboratories of America Inc.
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