Method for embedding messages into documents using distance fields
AssigneeMitsubishi Electric Research Laboratories, Inc.
InventorsShantanu Rane, Ronald N. Perry, Anthony Vetro
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Abstract
A method embeds a message into a document containing a set of glyphs. Individual glyphs in the document, groups of glyphs in the document, or the entire document are represented using a distance field that includes distance values from the shapes of interest. Each symbol of the message is represented as modifications of a subset of the distance values in the distance field. This subset of the distance values in the distance field is modified according to modification to produce a modified glyph in a modified document, wherein the symbol in the message is embedded in the modified glyph.
Claims25
A method for embedding symbols of a message into a document containing a set of glyphs, comprising:
- representing a glyph in a document as a distance field;
- representing a symbol in a message to be embedded in the document as a modification of a subset of values in the distance field;
- and
- modifying the subset of values in the distance field according to the modification to produce a modified glyph in a modified document, wherein the symbol in the message is embedded in the modified glyph, wherein steps of the method are performed by a processor.
A method for embedding a message into a document, comprising:
- representing at least part of a document as a distance field including distance values;
- representing a symbol in a message to be embedded in the document as a modification of a subset of the values in the distance field;
- and
- modifying the subset of the values in the distance field according to the modification to produce a modified document, wherein the symbol in the message is embedded in the modified document, wherein steps of the method are performed by a processor.
Dependencies are inferred from the claim text.