Patents by Inventor Serafim S. Loukas
Serafim S. Loukas 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: 8976858Abstract: A method and apparatus to improve error resiliency in processing a multimedia bitstream is described. A directory of header information is generated for a multimedia bitstream. The directory information comprises packet header information associated with the multimedia bitstream. The directory information may be transmitted to a receiver along with the multimedia bitstream. A receiver of the multimedia bitstream and the directory can utilize the header information to identify and locate packets within and subsequent to erroneous data in the received bitstream. By identifying and locating packets that may otherwise be discarded, the receiver may be able to improve error recovery and decoding of the multimedia data.Type: GrantFiled: May 15, 2006Date of Patent: March 10, 2015Assignee: QUALCOMM IncorporatedInventors: Thadi M. Nagaraj, Bruce Collins, Amnon Silberger, Gordon Kent Walker, Serafim S. Loukas, Vijayalakshmi R. Raveendran
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Patent number: 8923393Abstract: Aspects include systems and methods of improving processing in an encoder in a multimedia transmission system. Multimedia data may include one or more of motion video, audio, still images, or any other suitable type of audio-visual data. Aspects include an apparatus and method of encoding video data. For example, an apparatus and method of reduced reference frame search in video encoding is disclosed.Type: GrantFiled: November 2, 2006Date of Patent: December 30, 2014Assignee: QUALCOMM IncorporatedInventors: Serafim S. Loukas, Tao Tian, Vijayalakshmi R. Raveendran
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Patent number: 8885470Abstract: In general, this disclosure describes techniques for exchanging information between a plurality of encoder modules and a multiplex module to combine segments of data from the encoder modules with an improved overall quality. In particular, the encoder modules associate their respective segments of data with quality and rate information and send at least the quality and rate information associated with the segments of data to the multiplex module. The multiplex module analyzes the quality and rate information to determine whether the segments of data that encoder modules desire to include in the current superframe fit within the available bandwidth of a transmission channel. If the multiplex module determines the plurality of segments of data do not fit within the available bandwidth, the multiplex module selects one or more of the segments to be resized based on the quality and rate information received from the encoder modules.Type: GrantFiled: July 1, 2011Date of Patent: November 11, 2014Assignee: QUALCOMM IncorporatedInventors: Vijayalakshmi R. Raveendran, Gordon Kent Walker, Binita Gupta, Phanikumar Bhamidipati, Bruce Collins, Devarshi Shah, Robert S. Daly, Sten Jorgen Dahl, Serafim S. Loukas, Bharat Ahuja, Thadi M. Nagaraj, Vinod Kaushik, Prasanna Kannan
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Publication number: 20140177703Abstract: This disclosure describes techniques for controlling a perceived quality of multimedia sequences to try to achieve a desired constant perceptual quality regardless of the content of the sequences. In particular, an encoding device may implement quality control techniques to associate a sequence segment with a content “class” based on the content of the segment, determine a perceptual quality metric of the sequence segment, and adjust at least one encoding parameter used to encode the segment is encoded such that for the perceptual quality of the sequence segment converges to the desired quality.Type: ApplicationFiled: October 11, 2013Publication date: June 26, 2014Applicant: QUALCOMM IncorporatedInventors: Devarshi Parashar Shah, PhaniKumar Bhamidipati, Vinod Kaushik, Serafim S. Loukas, JR.
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Patent number: 8761162Abstract: Techniques for video encoding and decoding a common guide media logic channel (MLC) to enable fast acquisition and re/synchronization of the video stream while preserving compression efficiency are provided. Systems and methods to process multimedia data using channel switch frames are presented. The system comprises an encoder operative to generate a common guide media logical channel (MLC) of a plurality of channel switch frames (CSFs), each respective active channel having one or more CSFs in the guide MLC. The decoder in the system is operative to decode a set of the plurality of CSFs from the guide MLC. The decoder simultaneously displays programming content of the decoded set of the plurality of CSFs on a display and automatically switches to a primary bitstream of an active channel associated with a selected one displayed CSF.Type: GrantFiled: November 15, 2007Date of Patent: June 24, 2014Assignee: QUALCOMM IncorporatedInventors: Gordon Kent Walker, Vijayalakshmi R. Raveendran, Serafim S. Loukas, Jr., Seyfullah Halit Oguz, Fang Shi, Sitaraman Ganapathy Subramania, Phanikumar Bhamidipati, James T. Determan
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Patent number: 8582647Abstract: This disclosure describes techniques for controlling a perceived quality of multimedia sequences to try to achieve a desired constant perceptual quality regardless of the content of the sequences. In particular, an encoding device may implement quality control techniques to associate a sequence segment with a content “class” based on the content of the segment, determine a perceptual quality metric of the sequence segment, and adjust at least one encoding parameter used to encode the segment is encoded such that for the perceptual quality of the sequence segment converges to the desired quality.Type: GrantFiled: April 23, 2007Date of Patent: November 12, 2013Assignee: QUALCOMM IncorporatedInventors: Devarshi Shah, Phanikumar Bhamidipati, Vinod Kaushik, Serafim S. Loukas, Jr.
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Patent number: 8345743Abstract: Techniques for video encoding and decoding channel switch frames (CSF) to enable acquisition and re/synchronization of the video stream while preserving compression efficiency is provided. Systems and methods to process multimedia data enabling channel switching are presented. The systems generate a CSF with one or more network adaptation layer (NAL) units as a random access point (RAP) frame. Back-to-back frames are transmitted which include the CSF and a non-RAP frame, each having the same frame ID number.Type: GrantFiled: November 14, 2007Date of Patent: January 1, 2013Assignee: QUALCOMM IncorporatedInventors: Fang Shi, Christopher John Bennett, Serafim S. Loukas, Jr., Brian William Orr, Vijayalakshmi R. Raveendran, Scott T. Swazey, Amnon Silberger, Thadi M. Nagaraj, Gordon Kent Walker, David Brackman, Fang Liu, Sumeet Singh Sethi, Ramkumar Sampathkumar
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Publication number: 20110299587Abstract: In general, this disclosure describes techniques for exchanging information between a plurality of encoder modules and a multiplex module to combine segments of data from the encoder modules with an improved overall quality. In particular, the encoder modules associate their respective segments of data with quality and rate information and send at least the quality and rate information associated with the segments of data to the multiplex module. The multiplex module analyzes the quality and rate information to determine whether the segments of data that encoder modules desire to include in the current superframe fit within the available bandwidth of a transmission channel. If the multiplex module determines the plurality of segments of data do not fit within the available bandwidth, the multiplex module selects one or more of the segments to be resized based on the quality and rate information received from the encoder modules.Type: ApplicationFiled: July 1, 2011Publication date: December 8, 2011Applicant: QUALCOMM INCORPORATEDInventors: Vijayalakshmi R. RAVEENDRAN, Gordon Kent Walker, Binita Gupta, Phanikumar Bhamidipati, Bruce Collins, Devarshi Shah, Robert S. Daley, Sten Jorgen Dahl, Serafim S. Loukas, JR., Bharat Ahuja, Thadi M. Nagaraj, Vinod Kaushik, Prasanna Kannan
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Patent number: 7974193Abstract: In general, this disclosure describes techniques for exchanging information between a plurality of encoder modules and a multiplex module to combine segments of data from the encoder modules with an improved overall quality. In particular, the encoder modules associate their respective segments of data with quality and rate information and send at least the quality and rate information associated with the segments of data to the multiplex module. The multiplex module analyzes the quality and rate information to determine whether the segments of data that encoder modules desire to include in the current superframe fit within the available bandwidth of a transmission channel. If the multiplex module determines the plurality of segments of data do not fit within the available bandwidth, the multiplex module selects one or more of the segments to be resized based on the quality and rate information received from the encoder modules.Type: GrantFiled: January 30, 2007Date of Patent: July 5, 2011Assignee: QUALCOMM IncorporatedInventors: Vijayalakshmi R. Raveendran, Gordon Kent Walker, Binita Gupta, Phanikumar Bhamidipati, Bruce Collins, Devarshi Shah, Robert S. Daley, Sten Jorgen Dahl, Serafim S. Loukas, Jr., Bharat Ahuja, Thadi M. Nagaraj, Vinod Kaushik, Prasanna Kannan
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Publication number: 20080260042Abstract: This disclosure describes techniques for controlling a perceived quality of multimedia sequences to try to achieve a desired constant perceptual quality regardless of the content of the sequences. In particular, an encoding device may implement quality control techniques to associate a sequence segment with a content “class” based on the content of the segment, determine a perceptual quality metric of the sequence segment, and adjust at least one encoding parameter used to encode the segment is encoded such that for the perceptual quality of the sequence segment converges to the desired quality.Type: ApplicationFiled: April 23, 2007Publication date: October 23, 2008Applicant: QUALCOMM INCORPORATEDInventors: Devarshi Shah, Phanikumar Bhamidipati, Vinod Kaushik, Serafim S. Loukas
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Publication number: 20080212690Abstract: In general, this disclosure describes techniques of compensating for differences between a clock associated with an input stream of media data and a clock associated with an output stream of media data. Due to drift between a clock that governs the rate at which a transcoder receives media data units (“MDUs”) and a clock that governs the rate at which the transcoder outputs MDUs, the transcoder may receive MDUs at a rate that is faster or slower than a rate at which the transcoder outputs the MDUs. The transcoder compensates for such differences by identifying sets of received MDUs that account for a time equal to an output period minus a correction magnitude, modifying the identified sets of MDUs such that the sets of MDUs account for a time equal to the output period, and outputting the modified sets of MDUs as part of the output stream.Type: ApplicationFiled: December 20, 2007Publication date: September 4, 2008Applicant: QUALCOMM INCORPORATEDInventor: Serafim S. Loukas
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Publication number: 20080170564Abstract: Techniques for video encoding and decoding channel switch frames (CSF) to enable acquisition and re/synchronization of the video stream while preserving compression efficiency is provided. Systems and methods to process multimedia data enabling channel switching are presented. The systems generate a CSF with one or more network adaptation layer (NAL) units as a random access point (RAP) frame. Back-to-back frames are transmitted which include the CSF and a non-RAP frame, each having the same frame ID number.Type: ApplicationFiled: November 14, 2007Publication date: July 17, 2008Applicant: QUALCOMM INCORPORATEDInventors: Fang Shi, Christopher John Bennett, Serafim S. Loukas, Brian William Orr, Vijayalakshmi R. Raveendran, Scott T. Swazey, Amnon Silberger, Thadi M. Nagaraj, Gordon Kent Walker, David Brackman, Fang Liu, Sumeet Singh Sethi, Ramkumar Sampathkumar
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Publication number: 20080130755Abstract: Aspects include systems and methods of improving processing in an encoder in a multimedia transmission system. Multimedia data may include one or more of motion video, audio, still images, or any other suitable type of audio-visual data. Aspects include an apparatus and method of encoding video data. For example, an apparatus and method of reduced reference frame search in video encoding is disclosed.Type: ApplicationFiled: November 2, 2006Publication date: June 5, 2008Applicant: QUALCOMM INCORPORATEDInventors: Serafim S. Loukas, Tao Tian, Vijayalakshmi R. Raveendran
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Publication number: 20080127258Abstract: Techniques for video encoding and decoding a common guide media logic channel (MLC) to enable fast acquisition and re/synchronization of the video stream while preserving compression efficiency are provided. Systems and methods to process multimedia data using channel switch frames are presented. The system comprises an encoder operative to generate a common guide media logical channel (MLC) of a plurality of channel switch frames (CSFs), each respective active channel having one or more CSFs in the guide MLC. The decoder in the system is operative to decode a set of the plurality of CSFs from the guide MLC. The decoder simultaneously displays programming content of the decoded set of the plurality of CSFs on a display and automatically switches to a primary bitstream of an active channel associated with a selected one displayed CSF.Type: ApplicationFiled: November 15, 2007Publication date: May 29, 2008Applicant: QUALCOMM INCORPORATEDInventors: Gordon Kent Walker, Vijayalakshmi R. Raveendran, Serafim S. Loukas, Seyfullah Halit Oguz, Fang Shi, Sitaraman Ganapathy Subramania, Phanikumar Bhamidipati, James T. Determan