Image analysis – Image enhancement or restoration – Image filter
Reexamination Certificate
2011-06-28
2011-06-28
Patel, Kanji (Department: 2624)
Image analysis
Image enhancement or restoration
Image filter
C358S003260, C375S254000
Reexamination Certificate
active
07970230
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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Ikeda Roger M.
Kempf Jeffrey
Skoog Arnold P.
Brady III Wade James
Brill Charles A.
Patel Kanji
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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