Patents by Inventor Mehmet U. Celik
Mehmet U. Celik has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9253485Abstract: A method of watermarking a video signal includes encoding the video signal using at least one encoding parameter that is time-varied according to a watermarking pattern. The parameter affects information lost while encoding the signal. The parameter may be a quantization factor corresponding to a particular coefficient of an encoding transform. The parameter may be an element of a quantization matrix corresponding to a particular coefficient in a block DCT transform. The method may be implemented in devices with limited processing resources by means of a software update. The method enables the devices to imprint an encoded signal with a robust watermark, which may survive subsequent decompression and recompression. Alternatively, a video signal may be watermarked by modifying a magnitude of a non-dc spatial frequency component in a manner which varies with time according to a watermarking pattern. Corresponding watermark detection methods and watermarking devices also are disclosed.Type: GrantFiled: June 12, 2013Date of Patent: February 2, 2016Assignee: CIVOLUTION B.V.Inventors: Mehmet U. Celik, Johan C. Talstra, Aweke N. Lemma
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Patent number: 8726029Abstract: A system for cryptographic processing of content comprises an input for receiving the content. A plurality of look-up tables represents a white-box implementation of a combined cryptographic and watermarking operation. The look-up tables represent processing steps of the combined cryptographic and watermarking operation and the look-up tables being arranged for being applied according to a predetermined look-up scheme. The look-up scheme prescribes that an output of a first look-up table of the plurality of look-up tables be used to generate an input of a second look-up table of the plurality of look-up tables. The combined cryptographic and watermarking operation comprises a cryptographic operation and a watermarking operation. A control module looks up values in the plurality of look-up tables in dependence on the received content and in accordance to the look-up scheme, thereby applying the combined cryptographic and watermarking operation to the content.Type: GrantFiled: September 4, 2008Date of Patent: May 13, 2014Assignee: Irdeto Corporate B.V.Inventors: Stefan Katzenbeisser, Wilhelmus P. A. J. Michiels, Paulus M. H. M. A. Gorissen, Aweke N. Lemma, Mehmet U. Celik
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Patent number: 8638978Abstract: Methods for embedding digital watermarks in compressed video include perceptual adapting a digital watermark in predicted and non-predicted data based on block activity derived from the compressed video stream, embedding in predicted objects in a video stream having separately compressed video objects, and bit rate control of watermarked video.Type: GrantFiled: July 28, 2009Date of Patent: January 28, 2014Assignee: Digimarc CorporationInventors: Adnan M. Alattar, Eugene T. Lin, Mehmet U. Celik
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Publication number: 20130279741Abstract: A method of watermarking a video signal includes encoding the video signal using at least one encoding parameter that is time-varied according to a watermarking pattern. The parameter affects information lost while encoding the signal. The parameter may be a quantization factor corresponding to a particular coefficient of an encoding transform. The parameter may be an element of a quantization matrix corresponding to a particular coefficient in a block DCT transform. The method may be implemented in devices with limited processing resources by means of a software update. The method enables the devices to imprint an encoded signal with a robust watermark, which may survive subsequent decompression and recompression. Alternatively, a video signal may be watermarked by modifying a magnitude of a non-dc spatial frequency component in a manner which varies with time according to a watermarking pattern. Corresponding watermark detection methods and watermarking devices also are disclosed.Type: ApplicationFiled: June 12, 2013Publication date: October 24, 2013Inventors: Mehmet U. CELIK, Johan C. TALSTRA, Aweke N. LEMMA
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Patent number: 8467445Abstract: A method of watermarking a video signal includes encoding the video signal using at least one encoding parameter that is time-varied according to a watermarking pattern. The parameter affects information lost while encoding the signal. The parameter may be a quantization factor corresponding to a particular coefficient of an encoding transform. The parameter may be an element of a quantization matrix corresponding to a particular coefficient in a block DCT transform. The method may be implemented in devices with limited processing resources by means of a software update. The method enables the devices to imprint an encoded signal with a robust watermark, which may survive subsequent decompression and recompression. Alternatively, a video signal may be watermarked by modifying a magnitude of a non-dc spatial frequency component in a manner which varies with time according to a watermarking pattern. Corresponding watermark detection methods and watermarking devices also are disclosed.Type: GrantFiled: January 11, 2008Date of Patent: June 18, 2013Assignee: Civolution B.V.Inventors: Mehmet U. Celik, Johan C. Talstra, Aweke N. Lemma
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Publication number: 20100322463Abstract: A method of placing a watermark in a video stream estimates motion between frames in the video stream, and computes a representative motion for a frame. Before embedding the watermark in that frame, the method spatially adjusts a digital watermark by the representative motion. This method is particularly suited for embedding a watermark in a video stream compressed using motion estimation. In this case, the method uses the motion vectors in the video stream to compute a dominant motion for a frame, and then shifts the watermark by this dominant motion before embedding it in the frame.Type: ApplicationFiled: August 18, 2009Publication date: December 23, 2010Inventor: Mehmet U. Celik
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Publication number: 20100296649Abstract: A system for cryptographic processing of content comprises an input for receiving the content. A plurality of look-up tables represents a white-box implementation of a combined cryptographic and watermarking operation. The look-up tables represent processing steps of the combined cryptographic and watermarking operation and the look-up tables being arranged for being applied according to a predetermined look-up scheme. The look-up scheme prescribes that an output of a first look-up table of the plurality of look-up tables be used to generate an input of a second look-up table of the plurality of look-up tables. The combined cryptographic and watermarking operation comprises a cryptographic operation and a watermarking operation. A control module looks up values in the plurality of look-up tables in dependence on the received content and in accordance to the look-up scheme, thereby applying the combined cryptographic and watermarking operation to the content.Type: ApplicationFiled: September 4, 2008Publication date: November 25, 2010Applicant: Irdeto B.V.Inventors: Stefan Katzenbeisser, Wilhelmus P.A.J. Michiels, Paulus M.H.M.A. Gorissen, Aweke N. Lemma, Mehmet U. Celik
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Publication number: 20100128921Abstract: Methods for embedding digital watermarks in compressed video include perceptual adapting a digital watermark in predicted and non-predicted data based on block activity derived from the compressed video stream, embedding in predicted objects in a video stream having separately compressed video objects, and bit rate control of watermarked video.Type: ApplicationFiled: July 28, 2009Publication date: May 27, 2010Inventors: Adnan M. Alattar, Eugene T. Lin, Mehmet U. Celik
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Publication number: 20100046606Abstract: A method of watermarking a video signal includes encoding the video signal using at least one encoding parameter that is time-varied according to a watermarking pattern. The parameter affects information lost while encoding the signal. The parameter may be a quantization factor corresponding to a particular coefficient of an encoding transform. The parameter may be an element of a quantization matrix corresponding to a particular coefficient in a block DCT transform. The method may be implemented in devices with limited processing resources by means of a software update. The method enables the devices to imprint an encoded signal with a robust watermark, which may survive subsequent decompression and recompression. Alternatively, a video signal may be watermarked by modifying a magnitude of a non-dc spatial frequency component in a manner which varies with time according to a watermarking pattern. Corresponding watermark detection methods and watermarking devices also are disclosed.Type: ApplicationFiled: January 11, 2008Publication date: February 25, 2010Applicant: Civolution B.V.Inventors: Mehmet U. Celik, Johan C. Talstra, Aweke N. Lemma
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Patent number: 7577841Abstract: A method of placing a watermark in a video stream estimates motion between frames in the video stream, and computes a representative motion for a frame. Before embedding the watermark in that frame, the method spatially adjusts a digital watermark by the representative motion. This method is particularly suited for embedding a watermark in a video stream compressed using motion estimation. In this case, the method uses the motion vectors in the video stream to compute a dominant motion for a frame, and then shifts the watermark by this dominant motion before embedding it in the frame.Type: GrantFiled: November 19, 2002Date of Patent: August 18, 2009Assignee: Digimarc CorporationInventor: Mehmet U. Celik
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Publication number: 20040034778Abstract: A method of placing a watermark in a video stream estimates motion between frames in the video stream, and computes a representative motion for a frame. Before embedding the watermark in that frame, the method spatially adjusts a digital watermark by the representative motion. This method is particularly suited for embedding a watermark in a video stream compressed using motion estimation. In this case, the method uses the motion vectors in the video stream to compute a dominant motion for a frame, and then shifts the watermark by this dominant motion before embedding it in the frame.Type: ApplicationFiled: November 19, 2002Publication date: February 19, 2004Inventor: Mehmet U. Celik