Method for adaptively thresholding grayscale image data

Details Method for adaptively thresholding grayscale image data Method for adaptively thresholding grayscale image data

1993-11-10

1995-04-25

Mancuso, Joseph

Image analysis

Histogram processing

For setting a threshold

358466, 382 54, G06K 938

Patent

active

054106176

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.

REFERENCES:
patent: 4754332 (1988-06-01), Bergquist
patent: 4964066 (1990-10-01), Yamane et al.
patent: 5065444 (1991-11-01), Garber
patent: 5065447 (1991-11-01), Barnsley et al.
patent: 5123060 (1992-06-01), Cho et al.
patent: 5150421 (1992-09-01), Morishita et al.
patent: 5157740 (1992-10-01), Kelin et al.
patent: 5289374 (1994-02-01), Doi et al.

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