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Method and apparatus for MPEG artifacts reduction

  • US 20050129330A1
  • Filed: 10/12/2004
  • Published: 06/16/2005
  • Est. Priority Date: 12/16/2003
  • Status: Active Grant
First Claim
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1. A method of reducing mosquito noise in an image frame of a video signal, the method comprising:

  • providing a window of the image frame, the window including a plurality of pixel values;

    subtracting a selected one of the pixel values from the pixel values in the window to define a modified window of pixel value differences;

    computing a local mean (DC) value based on the pixel value differences;

    computing a mosquito noise reduction value based on the pixel value differences;

    computing an artifact attenuation factor as a function of a dynamic range measure of the pixel value differences; and

    computing a weighted sum of the mosquito noise reduction value and the local mean value, applying the artifact attenuation factor, and the selected pixel value, to generate a modified pixel value.

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