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Image noise level detection and removal system and method

  • US 9,607,238 B2
  • Filed: 08/07/2013
  • Issued: 03/28/2017
  • Est. Priority Date: 07/11/2013
  • Status: Expired due to Fees
First Claim
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1. An image processing system comprising:

  • a noise detection circuit comprising,an observed image local statistical extraction circuit that extracts a first local statistical characteristics from an observed image,a low-pass filter design circuit that designs a low-pass Gaussian filter according to the first local statistical characteristics from the observed image,a predicted noise image generation circuit that generates a predicted noise image using the low-pass Gaussian filter,a predicted noise image local statistical extraction circuit that extracts a second local statistical characteristics from the predicted noise image,a predicted original image local statistical extraction circuit that extracts a third local statistical characteristics from a predicted original image using the first local statistical characteristics of the observed image and the second local statistical characteristics of the predicted noise image, anda noise classification circuit that sets a flag level indicating a noise level for each pixel of the observed image according to the third local statistical characteristics of the predicted original image; and

    a noise removal circuit that sets a filter size according to the flag level and that removes noise, when the flag level for the each pixel of the observed image is determined at the noise classification circuit.

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