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Image processing apparatus, image processing method, noise-amount estimate apparatus, noise-amount estimate method, and storage medium

  • US 7,209,595 B2
  • Filed: 03/16/2005
  • Issued: 04/24/2007
  • Est. Priority Date: 06/01/1999
  • Status: Expired due to Fees
First Claim
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1. An image processing apparatus for processing input pixel data and for outputting the processed input pixel data as output pixel data comprising:

  • noise-amount estimating means comprising;

    variance calculation means for processing in units of a predetermined number of pixels and for calculating the variance of a plurality of pixel data in a local area including each pixel data;

    histogram generating means for generating the histogram of the variance calculated for each pixel data, in units of the predetermined number of pixels;

    noise-amount calculation means for obtaining the amount of noise included in the pixel data according to the histogram, in units of the predetermined number of pixels;

    input reliability calculation means for calculating an input reliability indicating the reliability of the input pixel data according to the estimated amount of noise;

    output reliability calculation means for calculating an output reliability indicating the reliability of the output pixel data; and

    processing means for processing the input pixel data according to the input reliability and the output reliability and for outputting the output pixel data.

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