Image analysis – Image enhancement or restoration – Image filter
Reexamination Certificate
2005-05-24
2005-05-24
Boudreau, Leo (Department: 2621)
Image analysis
Image enhancement or restoration
Image filter
C382S275000, C348S606000
Reexamination Certificate
active
06898327
ABSTRACT:
Flickering artifacts are removed from a displayed image by storing digital luminance values in a compressed form using disallowed luminance values clipped from a range of luminance values to encode run lengths of identical values of truncated luminance values and bits corresponding to bits truncated from the luminance values. A correction value is derived from a filter transfer function computed by summing an increase in correction value above a threshold within a range of luminance differences with a maximum change in correction value in each lower range, this providing a piecewise linear substantially quadratic transfer function without discontinuities that would engender other image artifacts. The non-linearity of the transfer function is this adaptive to different image conditions and types in regions of respective image planes and the correction factors implemented by the transfer function are freely adjustable to accommodate, for example, different scanning standards and display refresh rates.
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Aggarwal, Method for the Suppression of Flicker on interlaced color images, IBM Technical Disclosure Bulletin, vol. 30, No. 4 pp. 1543-1545.*
J. K. Aggarwal; “Method for the Suppression of Flicker on Interlaced Color Images”; IBM Technical Disclosure Bulletin, vol. 30, No. 4; Sep. 1987; pp. 1543-1545.
Hrusecky David A.
Rutter Roger S.
Boudreau Leo
International Business Machines - Corporation
Sherali Ishrat
Whitham Curtis & Christofferson, P.C.
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