Other

Northrop Grumman Systems Corporation

Hoai Le

Bing Wang

Yi Li

Shien-Tai Pan

Victor Kai-Chieh Liang

Maurice Chow

Richard Thai

Marco A Lopez

Phillip H Darling, Jr

Thai Le Khac

Peter E Carnvale

A two level cross-correlation based system for watermarking continuous digital media at the system application level. It is a post-compression process for watermarking where no a priori knowledge of the underlying compression algorithm is required. Per each compressed media frame, a current unique digital signature is generated based on the data from the current compressed frame plus the digital signature that has been previously generated. The signature thus generated is then used in conjunction with the next compressed frame to generate the next unique digital signature. All digital signatures are correlated according to the above process until a 'reset' signal is issued. A new chain of correlated digital signatures is produced by the system with a predetermined initial signature.

Two level cross-correlation based system for watermarking continuous digital media

A correlation-based system for watermarking continuous digital media at the system application level. It is a post-compression process for watermarking where no a priori knowledge of the underlying compression algorithm is required. Per each compressed media frame, a current unique digital signature is generated based on the data from the current compressed frame plus the digital signature that has been previously generated. The signature thus generated is then used in conjunction with the next compressed frame to generate the next unique digital signature. All digital signatures are correlated according to the above process until a 'reset' signal is issued. A new chain of correlated digital signatures is produced by the system with a pre-determined initial signature.

Correlation-based system for watermarking continuous digital media

A two level cross-correlation based system for watermarking continuous digital media at the system application level. It is a post-compression process for watermarking where no a priori knowledge of the underlying compression algorithm is required. Per each compressed media frame, a current unique digital signature is generated based on the data from the current compressed frame plus the digital signature that has been previously generated. The signature thus generated is then used in conjunction with the next compressed frame to generate the next unique digital signature. All digital signatures are correlated according to the above process until a 'reset' signal is issued. A new chain of correlated digital signatures is produced by the system with a pre-determined initial signature.

A system for the measurement of high bandwidth peak power pulses from laser sources. A laser pulse from a laser is directed onto the surface of a diffuser that replicates the pulse. A linear array of fiber optics of varying fiber length transmits the replicated pulses to a detector. The detector produces n pulses having a pulse width .lambda., each separated in time by a given time delay .DELTA.t which is directly proportioned to the length of each fiber. The output of the detector is fed to a digitizing oscilloscope to produce of digitized average pulse phase output.

Fiber optic noise suppressor

A portable measuring device for measuring electromagnetic radiation reflection. The device has a holder, a transceiver, and a display. The transceiver is movably mounted to the holder. The holder can be moved to several locations on a member being tested. The transceiver is moved up and down on the holder through the peaks and valleys of the reflected electromagnetic wave, in and out of phase, passing through and detecting the maximum reflected energy point. A system can be provided that uses the measurement at a predetermined frequency in comparing the measured property to a characteristic curve of the property for the material of the member being tested. The system can be used to plot a three-dimensional graph of surface reflection of the electromagnetic energy.

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Huntington Beach, CA, United States of America

Hoai Le