Automatic background detection of scanned documents
AssigneeXerox Corporation
InventorsRamesh Nagarajan, Xing Li, Francis K. Tse
Life of this patent
Estimating the term…
Abstract
A method for generating a background statistics that distinguishes between gray level information from document areas and non-document areas. The method includes determining a full page background statistics from selected pixels within a scanned area; determining a sub-region background statistics from selected pixels within a sub-region of the scanned area; determining if the sub-region background statistics corresponds to image data from a non-document area; determining if the full page background statistics is corrupted; and generating a validated full page background statistics if the full page background statistics is corrupted.
Claims19
A method for generating background statistics for a scanned document, comprising the steps of:
- (a) determining a full page background statistic from selected pixels within a document area;
- (b) determining a sub-region background statistic from selected pixels within a sub-region of the document area;
- (c) determining if the sub-region background statistic corresponds to image data from a non-document area;
- (d) determining if the full page background statistic is corrupted;
- and
- (e) generating a validated full page background statistic if the full page background statistic is corrupted.
A method for generating background statistics for a scanned document, comprising the steps of:
- (a) generating a full page background statistic from selected pixels within a document area;
- (b) generating a first sub-region background statistic from image data within a first sub-region of the document area;
- (c) generating a second sub-region background statistic from image data within a second sub-region of the document area;
- (d) determining if the first sub-region background statistic corresponds to image data from a non-document area;
- (e) if the first sub-region background statistic corresponds to image data from a non-document area, making a determination of whether the full page background statistic is corrupted based on the first sub-region background statistic and, if so, generating a validated full page background statistic;
- (f) determining if the second sub-region background statistic corresponds to image data from a non-document area;
- and
- (g) if the second sub-region background statistic corresponds to image data from a non-document area, making a determination of whether the full page background statistic is corrupted based on the second sub-region background statistic and, if so, generating a validated full page background statistic.
Dependencies are inferred from the claim text.