Patent ID: 6775394
Filing Date: 2004-08-10
Classification: G06T,H04N

Abstract:
A method for hiding data in document contents, the method comprising:receiving information relating to the document contents, wherein at least part of the document contents are of a binary nature; determining the presence of at least one object having at least one binary portion in the document by analyzing the document; associating a mapping between at least one binary class with at least one set of combinatorial halftone pixel patterns, wherein said binary class comprises at least one binary data element associated with at least one halftone pixel pattern that is a member of said set of combinatorial half-tone pixel patterns; converting the data to halftone pixel groups of at least two pixels by using said mapping to select at least one halftone pixel pattern for each datum in the data, and replacing said binary portion of the object with the halftone pixel groups.