Method and apparatus for sharpening an image by scaling elements of a frequency-domain representation
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United States of America Patent
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Jul 16, 2002
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app pub date -
Jan 6, 1999
filing date -
Jan 6, 1999
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Abstract
An original image is sharpened by obtaining a first frequency-domain representation of the original image, selecting one or more elements from this first representation based on one more criteria such as element magnitude and frequency, scaling the selected elements according to one or more scale factors, and forming a second frequency-domain representation by combining the scaled selected elements with the unselected elements of the first representation. A sharpened reproduction of the original image may be generated by applying an inverse transform to the second frequency-domain representation. A technique for deriving the value of the one or more scale factors is also discussed.
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