Patents by Inventor Shankar Regunathan
Shankar Regunathan 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: 11902525Abstract: Techniques and tools for encoding enhancement layer video with quantization that varies spatially and/or between color channels are presented, along with corresponding decoding techniques and tools. For example, an encoding tool determines whether quantization varies spatially over a picture, and the tool also determines whether quantization varies between color channels in the picture. The tool signals quantization parameters for macroblocks in the picture in an encoded bit stream. In some implementations, to signal the quantization parameters, the tool predicts the quantization parameters, and the quantization parameters are signaled with reference to the predicted quantization parameters. A decoding tool receives the encoded bit stream, predicts the quantization parameters, and uses the signaled information to determine the quantization parameters for the macroblocks of the enhancement layer video. The decoding tool performs inverse quantization that can vary spatially and/or between color channels.Type: GrantFiled: November 4, 2022Date of Patent: February 13, 2024Assignee: Microsoft Technology Licensing, LLCInventors: Shankar Regunathan, Shijun Sun, Chengjie Tu, Chih-Lung Lin
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Patent number: 11677964Abstract: Described tools and techniques relate to signaling for DC coefficients at small quantization step sizes. The techniques and tools can be used in combination or independently. For example, a tool such as a video encoder or decoder processes a VLC that indicates a DC differential for a DC coefficient, a FLC that indicates a value refinement for the DC differential, and a third code that indicates the sign for the DC differential. Even with the small quantization step sizes, the tool uses a VLC table with DC differentials for DC coefficients above the small quantization step sizes. The FLCs for DC differentials have lengths that vary depending on quantization step size.Type: GrantFiled: April 26, 2022Date of Patent: June 13, 2023Assignee: Microsoft Technology Licensing, LLCInventors: Chih-Lung Lin, Shankar Regunathan, Sridhar Srinivasan
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Patent number: 11671609Abstract: Described tools and techniques relate to signaling for DC coefficients at small quantization step sizes. The techniques and tools can be used in combination or independently. For example, a tool such as a video encoder or decoder processes a VLC that indicates a DC differential for a DC coefficient, a FLC that indicates a value refinement for the DC differential, and a third code that indicates the sign for the DC differential. Even with the small quantization step sizes, the tool uses a VLC table with DC differentials for DC coefficients above the small quantization step sizes. The FLCs for DC differentials have lengths that vary depending on quantization step size.Type: GrantFiled: April 26, 2022Date of Patent: June 6, 2023Assignee: Microsoft Technology Licensing, LLCInventors: Chih-Lung Lin, Shankar Regunathan, Sridhar Srinivasan
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Patent number: 11671608Abstract: Techniques and tools are described for decoding jointly coded information. For example, a decoder decodes a variable length code [“VLC”] signaled at macroblock level that jointly represents a transform type signal level, transform type, and subblock pattern. The decoder decodes one or more VLCs signaled at block level, each jointly representing a transform type and subblock pattern. The decoder may select between multiple VLC tables for the VLCs signaled macroblock level and/or block level.Type: GrantFiled: April 26, 2022Date of Patent: June 6, 2023Assignee: Microsoft Technology Licensing, LLCInventors: Thomas W. Holcomb, Chih-Lung Lin, Shankar Regunathan, Sridhar Srinivasan
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Patent number: 11638018Abstract: Techniques and tools are described for decoding jointly coded information. For example, a decoder decodes a variable length code [“VLC”] signaled at macroblock level that jointly represents a transform type signal level, transform type, and subblock pattern. The decoder decodes one or more VLCs signaled at block level, each jointly representing a transform type and subblock pattern. The decoder may select between multiple VLC tables for the VLCs signaled macroblock level and/or block level.Type: GrantFiled: April 26, 2022Date of Patent: April 25, 2023Assignee: Microsoft Technology Licensing, LLCInventors: Thomas W. Holcomb, Chih-Lung Lin, Shankar Regunathan, Sridhar Srinivasan
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Publication number: 20230055524Abstract: Techniques and tools for encoding enhancement layer video with quantization that varies spatially and/or between color channels are presented, along with corresponding decoding techniques and tools. For example, an encoding tool determines whether quantization varies spatially over a picture, and the tool also determines whether quantization varies between color channels in the picture. The tool signals quantization parameters for macroblocks in the picture in an encoded bit stream. In some implementations, to signal the quantization parameters, the tool predicts the quantization parameters, and the quantization parameters are signaled with reference to the predicted quantization parameters. A decoding tool receives the encoded bit stream, predicts the quantization parameters, and uses the signaled information to determine the quantization parameters for the macroblocks of the enhancement layer video. The decoding tool performs inverse quantization that can vary spatially and/or between color channels.Type: ApplicationFiled: November 4, 2022Publication date: February 23, 2023Applicant: Microsoft Technology Licensing, LLCInventors: Shankar Regunathan, Shijun Sun, Chengjie Tu, Chih-Lung Lin
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Patent number: 11575913Abstract: Described tools and techniques relate to signaling for DC coefficients at small quantization step sizes. The techniques and tools can be used in combination or independently. For example, a tool such as a video encoder or decoder processes a VLC that indicates a DC differential for a DC coefficient, a FLC that indicates a value refinement for the DC differential, and a third code that indicates the sign for the DC differential. Even with the small quantization step sizes, the tool uses a VLC table with DC differentials for DC coefficients above the small quantization step sizes. The FLCs for DC differentials have lengths that vary depending on quantization step size.Type: GrantFiled: June 15, 2021Date of Patent: February 7, 2023Assignee: Microsoft Technology Licensing, LLCInventors: Chih-Lung Lin, Shankar Regunathan, Sridhar Srinivasan
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Patent number: 11528481Abstract: Techniques and tools for encoding enhancement layer video with quantization that varies spatially and/or between color channels are presented, along with corresponding decoding techniques and tools. For example, an encoding tool determines whether quantization varies spatially over a picture, and the tool also determines whether quantization varies between color channels in the picture. The tool signals quantization parameters for macroblocks in the picture in an encoded bit stream. In some implementations, to signal the quantization parameters, the tool predicts the quantization parameters, and the quantization parameters are signaled with reference to the predicted quantization parameters. A decoding tool receives the encoded bit stream, predicts the quantization parameters, and uses the signaled information to determine the quantization parameters for the macroblocks of the enhancement layer video. The decoding tool performs inverse quantization that can vary spatially and/or between color channels.Type: GrantFiled: August 17, 2021Date of Patent: December 13, 2022Assignee: Microsoft Technology Licensing, LLCInventors: Shankar Regunathan, Shijun Sun, Chengjie Tu, Chih-Lung Lin
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Patent number: 11451794Abstract: Techniques and tools for performing fading compensation in video processing applications are described. For example, during encoding, a video encoder performs fading compensation using fading parameters comprising a scaling parameter and a shifting parameter on one or more reference images. During decoding, a video decoder performs corresponding fading compensation on the one or more reference images.Type: GrantFiled: July 7, 2021Date of Patent: September 20, 2022Assignee: Microsoft Technology Licensing, LLCInventors: Sridhar Srinivasan, Shankar Regunathan
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Patent number: 11451793Abstract: Techniques and tools for performing fading compensation in video processing applications are described. For example, during encoding, a video encoder performs fading compensation using fading parameters comprising a scaling parameter and a shifting parameter on one or more reference images. During decoding, a video decoder performs corresponding fading compensation on the one or more reference images.Type: GrantFiled: July 7, 2021Date of Patent: September 20, 2022Assignee: Microsoft Technology Licensing, LLCInventors: Sridhar Srinivasan, Shankar Regunathan
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Publication number: 20220264121Abstract: Described tools and techniques relate to signaling for DC coefficients at small quantization step sizes. The techniques and tools can be used in combination or independently. For example, a tool such as a video encoder or decoder processes a VLC that indicates a DC differential for a DC coefficient, a FLC that indicates a value refinement for the DC differential, and a third code that indicates the sign for the DC differential. Even with the small quantization step sizes, the tool uses a VLC table with DC differentials for DC coefficients above the small quantization step sizes. The FLCs for DC differentials have lengths that vary depending on quantization step size.Type: ApplicationFiled: April 26, 2022Publication date: August 18, 2022Applicant: Microsoft Technology Licensing, LLCInventors: Chih-Lung Lin, Shankar Regunathan, Sridhar Srinivasan
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Publication number: 20220256171Abstract: Techniques and tools are described for decoding jointly coded information. For example, a decoder decodes a variable length code [“VLC”] signaled at macroblock level that jointly represents a transform type signal level, transform type, and subblock pattern. The decoder decodes one or more VLCs signaled at block level, each jointly representing a transform type and subblock pattern. The decoder may select between multiple VLC tables for the VLCs signaled macroblock level and/or block level.Type: ApplicationFiled: April 26, 2022Publication date: August 11, 2022Applicant: Microsoft Technology Licensing, LLCInventors: Thomas W. Holcomb, Chih-Lung Lin, Shankar Regunathan, Sridhar Srinivasan
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Publication number: 20220256170Abstract: Techniques and tools are described for decoding jointly coded information. For example, a decoder decodes a variable length code [“VLC”] signaled at macroblock level that jointly represents a transform type signal level, transform type, and subblock pattern. The decoder decodes one or more VLCs signaled at block level, each jointly representing a transform type and subblock pattern. The decoder may select between multiple VLC tables for the VLCs signaled macroblock level and/or block level.Type: ApplicationFiled: April 26, 2022Publication date: August 11, 2022Applicant: Microsoft Technology Licensing, LLCInventors: Thomas W. Holcomb, Chih-Lung Lin, Shankar Regunathan, Sridhar Srinivasan
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Publication number: 20220256172Abstract: Described tools and techniques relate to signaling for DC coefficients at small quantization step sizes. The techniques and tools can be used in combination or independently. For example, a tool such as a video encoder or decoder processes a VLC that indicates a DC differential for a DC coefficient, a FLC that indicates a value refinement for the DC differential, and a third code that indicates the sign for the DC differential. Even with the small quantization step sizes, the tool uses a VLC table with DC differentials for DC coefficients above the small quantization step sizes. The FLCs for DC differentials have lengths that vary depending on quantization step size.Type: ApplicationFiled: April 26, 2022Publication date: August 11, 2022Applicant: Microsoft Technology Licensing, LLCInventors: Chih-Lung Lin, Shankar Regunathan, Sridhar Srinivasan
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Patent number: 11356678Abstract: Techniques and tools are described for decoding jointly coded information. For example, a decoder decodes a variable length code [“VLC”] signaled at macroblock level that jointly represents a transform type signal level, transform type, and subblock pattern. The decoder decodes one or more VLCs signaled at block level, each jointly representing a transform type and subblock pattern. The decoder may select between multiple VLC tables for the VLCs signaled macroblock level and/or block level.Type: GrantFiled: February 17, 2021Date of Patent: June 7, 2022Assignee: Microsoft Technology Licensing, LLCInventors: Thomas W. Holcomb, Chih-Lung Lin, Shankar Regunathan, Sridhar Srinivasan
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Publication number: 20210377535Abstract: Techniques and tools for encoding enhancement layer video with quantization that varies spatially and/or between color channels are presented, along with corresponding decoding techniques and tools. For example, an encoding tool determines whether quantization varies spatially over a picture, and the tool also determines whether quantization varies between color channels in the picture. The tool signals quantization parameters for macroblocks in the picture in an encoded bit stream. In some implementations, to signal the quantization parameters, the tool predicts the quantization parameters, and the quantization parameters are signaled with reference to the predicted quantization parameters. A decoding tool receives the encoded bit stream, predicts the quantization parameters, and uses the signaled information to determine the quantization parameters for the macroblocks of the enhancement layer video. The decoding tool performs inverse quantization that can vary spatially and/or between color channels.Type: ApplicationFiled: August 17, 2021Publication date: December 2, 2021Applicant: Microsoft Technology Licensing, LLCInventors: Shankar Regunathan, Shijun Sun, Chengjie Tu, Chih-Lung Lin
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Publication number: 20210337213Abstract: Techniques and tools for performing fading compensation in video processing applications are described. For example, during encoding, a video encoder performs fading compensation using fading parameters comprising a scaling parameter and a shifting parameter on one or more reference images. During decoding, a video decoder performs corresponding fading compensation on the one or more reference images.Type: ApplicationFiled: July 7, 2021Publication date: October 28, 2021Applicant: Microsoft Technology Licensing, LLCInventors: Sridhar Srinivasan, Shankar Regunathan
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Publication number: 20210337212Abstract: Techniques and tools for performing fading compensation in video processing applications are described. For example, during encoding, a video encoder performs fading compensation using fading parameters comprising a scaling parameter and a shifting parameter on one or more reference images. During decoding, a video decoder performs corresponding fading compensation on the one or more reference images.Type: ApplicationFiled: July 7, 2021Publication date: October 28, 2021Applicant: Microsoft Technology Licensing, LLCInventors: Sridhar Srinivasan, Shankar Regunathan
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Publication number: 20210329269Abstract: Described tools and techniques relate to signaling for DC coefficients at small quantization step sizes. The techniques and tools can be used in combination or independently. For example, a tool such as a video encoder or decoder processes a VLC that indicates a DC differential for a DC coefficient, a FLC that indicates a value refinement for the DC differential, and a third code that indicates the sign for the DC differential. Even with the small quantization step sizes, the tool uses a VLC table with DC differentials for DC coefficients above the small quantization step sizes. The FLCs for DC differentials have lengths that vary depending on quantization step size.Type: ApplicationFiled: June 15, 2021Publication date: October 21, 2021Applicant: Microsoft Technology Licensing, LLCInventors: Chih-Lung Lin, Shankar Regunathan, Sridhar Srinivasan
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Patent number: 11122268Abstract: Techniques and tools for encoding enhancement layer video with quantization that varies spatially and/or between color channels are presented, along with corresponding decoding techniques and tools. For example, an encoding tool determines whether quantization varies spatially over a picture, and the tool also determines whether quantization varies between color channels in the picture. The tool signals quantization parameters for macroblocks in the picture in an encoded bit stream. In some implementations, to signal the quantization parameters, the tool predicts the quantization parameters, and the quantization parameters are signaled with reference to the predicted quantization parameters. A decoding tool receives the encoded bit stream, predicts the quantization parameters, and uses the signaled information to determine the quantization parameters for the macroblocks of the enhancement layer video. The decoding tool performs inverse quantization that can vary spatially and/or between color channels.Type: GrantFiled: April 15, 2019Date of Patent: September 14, 2021Assignee: Microsoft Technology Licensing, LLCInventors: Shankar Regunathan, Shijun Sun, Chengjie Tu, Chih-Lung Lin