| Patent application number | Description | Published |
|---|
| 20090022360 | Quantization-Based Data Embedding in Mapped Data - Novel methods and systems for quantization based data embedding and reading in host signals, such as image, audio and video signals. To embed auxiliary data in a host signal, an embedder maps the host signal from a first domain into a mapped signal in a second domain. The embedder performs quantization based embedding of auxiliary data into the host signal using quantizers. The quantizers are adapted such that the relationship between corresponding quantizers in the first and second domains satisfies a predetermined constraint. The mapping improves the robustness of the data embedding method by increasing the chances that the embedded data can be recovered by an auxiliary data reader after modifications. A related embedding method projects the mapped signal unto a vector, and specifically, a pseudorandom vector. It performs quantization based embedding on the projected signal. The use of this projection provides added robustness of the embedded data to noise and other forms of distortion. | 01-22-2009 |
| 20090060264 | Variable Message Coding Protocols for Encoding Auxiliary Data in Media Signals - Variable message coding protocols enable greater flexibility in encoding auxiliary data in media signals. One such protocol employs a version identifier that indicates the type of coding used to process an auxiliary data message before it is embedded in a host media signal. This version identifier specifies the type of error robustness coding applied to a variable message. The error robustness coding may be varied to alter the message payload capacity for different versions of auxiliary data embedding and reading systems. Another protocol uses control symbols to specify the format and variable length of the variable message. | 03-05-2009 |
| 20090080694 | Deriving Multiple Identifiers from Multimedia Content - The presently claimed invention relates generally to content identification, such as deriving identifiers from content itself. One claim recites a method including: using a processor, deriving first information from audio elements of an audio signal; using a processor, deriving second information from data representing picture elements of a video signal that is associated with the audio signal; and utilizing the first information or the second information in a content filtering process, said process utilizes a recognition unit or device to sample content being distributed on a network, and controls further distribution of the content in the network based at least in part on the first information or the second information. Of course, other combinations and claims are provided as well. | 03-26-2009 |
| 20100027837 | Extracting Multiple Identifiers from Audio and Video Content - The presently claimed invention relates generally to content identification, such as extracting identifying information from content itself. One claim recites a method including: extracting first identifying information from data representing audio elements of an audio signal, said act of extracting first identifying information from data representing audio elements of the audio signal utilizes a programmed electronic processor; extracting second identifying information from data representing picture elements of a video signal that is associated with the audio signal, said act of extracting second identifying information from data representing picture elements of the video signal utilizes a programmed electronic processor; and utilizing the first identifying information or the second identifying information in a synchronization process, said synchronization process controls content synchronization during rendering of the audio signal or the video signal. Of course, other combinations and claims are provided as well. | 02-04-2010 |
| 20100042843 | Benchmarks for Digital Watermarking - The presently claimed invention relates generally to digital watermarking of data, e.g., representing video or audio. One claim recites a method including: obtaining data representing video or audio; using a multi-purpose electronic processor programmed for: transforming the data into a transform domain, analyzing the transformed data to identify a plurality of transform coefficients according to predetermined criteria, and altering the identified plurality of transform coefficients to carry a digital watermark; and analyzing the data to determine a baseline state for the digital watermark. Of course, other combinations and claims are provided too. | 02-18-2010 |
| 20100303283 | ADAPTIVE PREDICTION FILTERING FOR ENCODING/DECODING DIGITAL SIGNALS IN MEDIA CONTENT - A method computes signal characteristics of a host signal in which a digital signal is encoded, and analyzes the characteristics to determine an extent to which the signal characteristics correspond to characteristics of the digital signal. The method adapts parameters of a predictive filter or prediction function applied to the host signal based on the extent to which the signal characteristics correspond to the characteristics of the digital signal. In one embodiment, different filters or filter parameters are selected to match different signal characteristics of the host signal with the characteristics of the digital signal. These predictive filtering techniques also enable optimized encoding of digital signals that adapt the encoding of digital signals to take advantage of predictive filtering in the decoding process. | 12-02-2010 |
| 20110081041 | Variable Message Coding Protocols For Encoding Auxiliary Data in Media Signals - Variable message coding protocols enable greater flexibility in encoding auxiliary data in media signals. One such protocol employs a version identifier that indicates the type of coding used to process an auxiliary data message before it is embedded in a host media signal. This version identifier specifies the type of error robustness coding applied to a variable message. The error robustness coding may be varied to alter the message payload capacity for different versions of auxiliary data embedding and reading systems. Another protocol uses control symbols to specify the format and variable length of the variable message. | 04-07-2011 |
| 20110150268 | Perceptual Modeling of Media Signals for Data Hiding - The present disclosure relates generally to embedding auxiliary data and data hiding. One claim recites a method including: receiving data representing a media signal; using a programmed electronic processor, calculating perceptibility characteristics of the media signal, in which the perceptibility characteristics include contrast; using a programmed electronic processor, calculating a non-linear contrast to gain mapping using the perceptibility characteristics; using a programmed electronic processor, embedding an auxiliary signal in the media signal with reference to the non-linear contrast to gain mapping. Other claims and combinations are also provided. | 06-23-2011 |
