Patent ID: 6043900
Filing Date: 2000-03-28
Classification: G06T,H04N

Abstract:
A method for automatically determining proper background values for a document, comprising the steps of:(a) generating a histogram of the document;(b) determining if a background characteristic of the document is uniform;(c) setting a white background value equal to a first calculated white peak value when said step (b) determines that a background characteristic of the document is uniform;(d) setting a white background value equal to a second calculated white peak value when said step (b) determines that a background characteristic of the document is non-uniform;(e) determining if a foreground value of the document is valid when said step (b) determines that a background characteristic of the document is uniform; and(f) setting a black background value equal to a black peak value calculated from the histogram when said step (e) determines that a foreground value of the document is valid.