H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 1/403 (2006.01) H04N 1/407 (2006.01) H04N 1/41 (2006.01) G06F 15/66 (1990.01)
Patent
CA 2108797
A method and apparatus for adaptively adjusting (e.g. thresholding) grayscale image data associates with each document image file (210, 212) a predetermined grayscale adjusting function (216) which can be used to threshold, contrast stretch and gray le- vel reduce the original gray level image of the document into a picture representation for display at workstations, the picture re- presentation yielding increased contrast of written and printed text viewed. The invention includes a method of generating a re- mapping function for use in converting near-photographic docu- ment 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 docu- ment information, such as a histogram of all the document's origi- nal pixels, is used to generate at least one threshold gray level va- lue 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 (216) addressed in accordance with the original pixel data.
Kidd Robert Charles
Klein Robert Dennis
R. William Wray & Associates
Unisys Corporation
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