• 专利标题: METHOD AND SYSTEM FOR NOISE LEVEL DETECTION IN IMAGE DATA
  • 申请号: US12101944
    申请日: 2008-04-11
  • 公开(公告)号: US20090257674A1
    公开(公告)日: 2009-10-15
  • 发明人: Stuart A. Schweid
  • 申请人: Stuart A. Schweid
  • 申请人地址: US CT Norwalk
  • 专利权人: Xerox Corporation
  • 当前专利权人: Xerox Corporation
  • 当前专利权人地址: US CT Norwalk
  • 主分类号: G06K9/40
  • IPC分类号: G06K9/40
METHOD AND SYSTEM FOR NOISE LEVEL DETECTION IN IMAGE DATA
摘要:
A system determines the noise level of image data by high pass filtering image data. Absolutes values of the high pass filtered image data are determined. Thereafter, multiple mean values for absolute values less than a predetermined number of threshold values are determined. Based upon the determined mean values, a plurality of estimated mean values is calculated, each estimated mean value being calculated from a combination of two determined mean values. The noise of the image is determined from a combination of the minimum estimated mean value and the maximum estimated mean value. This noise can be optionally used by a sigma filter, at Step S740, to sigma filter the image data.
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