Method and system for noise level detection in image data

Details Method and system for noise level detection in image data Method and system for noise level detection in image data

2008-04-11

2011-11-08

Cunningham, Gregory F (Department: 2624)

Image analysis

Image enhancement or restoration

Artifact removal or suppression

C348S666000

Reexamination Certificate

active

08055093

ABSTRACT:
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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