Image processing with minimization of ringing artifacts and...

Details Image processing with minimization of ringing artifacts and... Image processing with minimization of ringing artifacts and...

2007-08-07

2007-08-07

Zimmerman, Mark (Department: 2628)

Image analysis

Image enhancement or restoration

Image filter

C382S261000, C345S660000

Reexamination Certificate

active

10331567

ABSTRACT:
A method of reducing ringing artifacts in image data that has been filtered with a high frequency emphasis filter. For each filtered data value, a local variance is calculated from data values at neighboring filter taps. This variance is compared to a threshold, and if the threshold is exceeded, the filtered data value is limited between local minimum and maximum values. A method of reducing noise, also using the local variance, is also described.

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