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Noise reduction method utilizing probabilistic weighting, apparatus, and program for digital image processing

  • US 6,681,054 B1
  • Filed: 05/01/2000
  • Issued: 01/20/2004
  • Est. Priority Date: 05/01/2000
  • Status: Expired due to Fees
First Claim
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1. A method of processing a digital image channel to remove noise, comprising the steps of:

  • a) identifying a pixel of interest;

    b) identifying at least two sampled local regions of pixels about the pixel of interest;

    c) calculating a noise free pixel estimate for each sampled local region of pixels;

    d) using the noise free pixel estimates, a noise model of the expected noise level in the digital image channel and the pixel of interest to calculate a probabilistic weighting factor for each noise free pixel estimate; and

    e) using the noise free pixel estimates and the probabilistic weighting factors for calculating a noise reduced pixel value.

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