Image analysis – Image enhancement or restoration – Image filter
Reexamination Certificate
2006-05-09
2006-05-09
Ahmed, Samir (Department: 2625)
Image analysis
Image enhancement or restoration
Image filter
C382S274000, C382S275000, C358S001200, C358S003260
Reexamination Certificate
active
07043090
ABSTRACT:
A method of enhancing the tonal characteristics of a digital image, includes receiving a source digital image including a plurality of pixels; producing a tone scale function that can be used to enhance the tonal characteristics of the source digital image; classifying the tone scale function into one of two or more categories based on the effect the tone scale function will have on the numerical range of pixel values, wherein the classification categories include expansive and compressive; and using the tone scale function, the source digital image, and a spatial filter to produce an enhanced digital image when the tone scale function has been classified as compressive, and using the tone scale function and the source digital image without a spatial filter to produce the enhanced digital image when the tone scale function has been classified as expansive.
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Gonzalez et al, Digital Image Processing Passage, Digital Image Processing XX XX 1992 pp. 166-175.
Gallagher Andrew C.
Gindele Edward B.
Ahmed Samir
Eastman Kodak Company
Kassa Yosef
Owens Raymond L.
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