Method and apparatus for contrast enhancement
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United States of America Patent
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Nov 14, 1995
Grant Date -
N/A
app pub date -
Aug 3, 1992
filing date -
Aug 14, 1991
priority date (Note) -
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Abstract
A method and apparatus are disclosed for enhancing the contrast of a digital image by a) decomposing said original image into a sequence of detail images or into an array of coefficients representing detail strength at multiple resolution levels and a residual image, b) modifying each pixel of each detail image or each detail coefficient according to at least one non-linear monotonically increasing odd conversion function, c) constructing said processed image by accumulating detail obtained from said modified detail images or from said detail coefficients, and further adding said residual image.
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