Methods and apparatuses for watermark embedding and extracting are provided. A method for watermark extracting includes obtaining a carrier object embedded with a watermark image; determining at least one encoding region that includes watermark information; determining a plurality of template lattices from the at least one encoding region, the plurality of template lattices comprising a plurality of positioning template lattices and one or more encoding template lattices; and obtaining the watermark information according to the plurality of template lattices.

A method and system for automatically verifying the authenticity of documents is provided. The method has: scanning a document to be verified in the visible and ultraviolet light spectrum; detecting in the scanned document digital watermarks printed with visible and ultraviolet ink; decrypting the marks, thereby obtaining an ultraviolet mark identifier and a variable data mark identifier; validating the percentage of the mark by checking for the presence of the digital watermark in different areas of the scanned document; comparing the mark identifiers obtained with mark identifiers stored in a database; and determining the validity of the document on the basis of the comparison. The invention allows the validity of the data printed in the document to be checked automatically, reducing the possibility of the undetected falsification, modification or total or partial alteration of a document.

Methods and apparatuses for watermark embedding and extracting are provided. A method for watermark extracting includes obtaining a carrier object embedded with a watermark image; determining at least one encoding region that includes watermark information; determining a plurality of template lattices from the at least one encoding region, the plurality of template lattices comprising a plurality of positioning template lattices and one or more encoding template lattices; and obtaining the watermark information according to the plurality of template lattices.

A watermark image may be generated that includes a first set of encoded pixels each of which is assigned a first transparency value and a second set of encoded pixels each of which is assigned a second transparency value, the second transparency level being different from the first transparency level. The encoded pixels may be distributed among a set of blank pixels such that each encoded pixel neighbors one or more blank pixels in the watermark image, and in particular at least two blank pixels in the watermark image. Herein, each blank pixel may be assigned the second transparency value. The watermark image may be overlaid and blended over a background source image to create an encoded source image. A decoder system may recover encoded information from the encoded source image.

The subject matter discloses examples of an identification marking system comprising a component analyzer to identify a plurality of components present within a print artwork. The identification marking system further comprises a marking technique analyzer to determine marking settings for the plurality of components based on component properties and predefined marking rules. The marking settings for a component indicates a marking technique identified for linking an identification mark with the component. The marking technique analyzer is further to communicate the print artwork and the marking settings to an identification marking engine for identification marking.

A watermark image may be generated that includes a first set of encoded pixels each of which is assigned a first transparency value and a second set of encoded pixels each of which is assigned a second transparency value, the second transparency level being different from the first transparency level. The encoded pixels may be distributed among a set of blank pixels such that each encoded pixel neighbors one or more blank pixels in the watermark image, and in particular at least two blank pixels in the watermark image. Herein, each blank pixel may be assigned the second transparency value. The watermark image may be overlaid and blended over a background source image to create an encoded source image. A decoder system may recover encoded information from the encoded source image.

Methods and apparatuses for watermark embedding and extracting are provided. A method for watermark embedding includes obtaining a carrier object and watermark information to be embedded in the carrier object; generating at least one encoding region including the watermark information according to the watermark information, the at least one encoding region including a plurality of template lattices; obtaining a watermark image according to the at least one encoding region; and embedding the watermark image in the carrier object.

An image coding device adapted to code time-continuous pictures is provided. An embedding position information conversion unit acquires embedding position information indicating a position in a picture, by using a one-way function based on time-continuous information. An image coding unit selects a coding block in the picture based on the embedding position information, embeds electronic watermark information in a coding parameter used to code the coding block, and codes the coding block by using the coding parameter in which the electronic watermark information is embedded.

A method and system for automatically verifying the authenticity of documents is provided. The method has: scanning a document to be verified in the visible and ultraviolet light spectrum; detecting in the scanned document digital watermarks printed with visible and ultraviolet ink; decrypting the marks, thereby obtaining an ultraviolet mark identifier and a variable data mark identifier; validating the percentage of the mark by checking for the presence of the digital watermark in different areas of the scanned document; comparing the mark identifiers obtained with mark identifiers stored in a database; and determining the validity of the document on the basis of the comparison. The invention allows the validity of the data printed in the document to be checked automatically, reducing the possibility of the undetected falsification, modification or total or partial alteration of a document.

A watermark image may be generated that includes a first set of encoded pixels each of which is assigned a first transparency value and a second set of encoded pixels each of which is assigned a second transparency value, the second transparency level being different from the first transparency level. The encoded pixels may be distributed among a set of blank pixels such that each encoded pixel neighbors one or more blank pixels in the watermark image, and in particular at least two blank pixels in the watermark image. Herein, each blank pixel may be assigned the second transparency value. The watermark image may be overlaid and blended over a background source image to create an encoded source image. A decoder system may recover encoded information from the encoded source image.