New pending patent applications are published by the USPTO on Thursdays. This week's Spotlight Applications concern aspects of steganography (in this case digital watermarking) and digital fingerprinting. Assigned to Unisys, the first application discloses techniques for embedding a data message in a carrier object using steganography. Assigned to Friend of Media Limited, the second application discloses techniques for security and/or tracing video media-content.
20170154396, "Method and system for protecting data using steganography," assigned to Unisys.
A method and apparatus for embedding a data message in a carrier object using steganography. The method provides a secret key and determines an indicator channel from a plurality of color channels in the carrier object, wherein the indicator channel is the color channel in the carrier object that has a maximum number of different pixel values in the carrier object. The method generates a sorted indicator channel value array based on the channel values and the frequency of occurrence of each value of the indicator channel in the carrier object. For each indicator channel value in the sorted indicator channel value array, the method iterates through the carrier object to determine the pixel in the carrier object whose indicator channel value is the same as the current indicator channel value in the sorted indicator channel value array. For pixels in the carrier object whose indicator channel value is the same as the current indicator channel value, and based on the value of a portion of the secret key, the method embeds a first portion of the data message into a first color channel other than the indicator color channel and embeds a second portion of the data message into a second color channel other than the indicator color channel and other than the first color channel. The method repeats the iteration and embedding until all of the data message is embedded into the carrier object, thereby generating a stego image.
20170155933, "Security and/or tracing video media-content," assigned to Friend For Media Limited (GB)
A method of securing and/or tracing video media-content which comprises a plurality of frames, the method comprising, receiving at least one candidate media-content which has been determined to have a fingerprint substantially the same as a reference fingerprint generated for the video media-content, processing the candidate media-content after comparison with the video media-content used to generate the reference fingerprint to temporally align the candidate media-content to identify which frames contain the unique identifier; and extracting the unique identifier from the identified frames within the or each candidate video media-content to identify the user ID held within the unique identifier.