Automatic threshold determination for a digital scanner

Details Automatic threshold determination for a digital scanner Automatic threshold determination for a digital scanner

1993-12-21

1997-07-22

Couso, Jose L.

Image analysis

Histogram processing

For setting a threshold

382169, 382271, 36473601, G06K 938

Patent

active

056510772

ABSTRACT:
A computer-based system and method automatically determines a threshold level for each cell of a digital document having one or more cells. Each cell of the document has a plurality of pixels and each pixel has associated therewith a plurality of bits to represent a graylevel for that pixel. A co-occurrence matrix indicating a quantity of each pixel graylevel pair in the cell is constructed. From this matrix, a first histogram is constructed and used to determine a background and a foreground peak for the cell and the features for these peaks. The center of mass for the cell is determined based on these features and is used to determine the threshold level for the cell.

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