Automatic background detection of scanned documents
AssigneeXerox Corporation
InventorsXing Li, Ramesh Nagarajan, Mihai Cuciurean-Zapan
Life of this patent
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Abstract
A background detection process that analyzes background information for the purpose of limiting the impact of intensity information obtained from non-document areas includes: identifying a first white peak from pixels within a first document region; identifying a second white peak from pixels within a second document region; determining if the first white peak was identified using image data from outside of the input document; and if so, identifying a third white peak from pixels within the first document region based on the second white peak.
Claims9
A method for generating a background peak for a scanned document, comprising:
- generating a first histogram from pixels within a first document area, the first document region representing a full page;
- generating a second histogram from pixels within a second document region;
- identifying a first white peak from the first histogram;
- identifying a second white peak from the second histogram;
- comparing the first white peak to at least one of a minimum threshold, a maximum threshold, and a threshold generated as a function of the second white peak;
- and
- identifying a third white peak from within a range of the first histogram defined by a function of the first white peak and by a function of the second white peak.
A method of determining a background statistic for a scanned input document, comprising the steps of:
- identifying a first white peak from pixels within a first document region;
- identifying a second white peak from pixels within a second document region;
- determining if the first white peak was identified using image data from outside of the input document;
- and
- if so, identifying a third white peak from pixels within the first document region based on the second white peak.
Dependencies are inferred from the claim text.