Method for adaptively thresholding grayscale image data
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United States of America Patent
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Apr 25, 1995
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app pub date -
Nov 10, 1993
filing date -
Apr 25, 1991
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Abstract
A method of generating a remapping function for use in converting near-photographic document image pixel gray level data lying in a first range of gray level values to higher contrast, background-suppressed pixel gray level data lying in a second more limited gray level range. Global document information, such as a histogram of all the document's original pixels, is used to generate at least one threshold gray level value and to determine the shape of the remapping function on either side of the threshold. Preferably, the remapping function is implemented by a look-up table addressed in accordance with the original pixel data.
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