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: 10063863Abstract: 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: March 11, 2016Date of Patent: August 28, 2018Assignee: Microsoft Technology Licensing, LLCInventors: Chih-Lung Lin, Shankar Regunathan, Sridhar Srinivasan
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Publication number: 20180184124Abstract: 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: November 10, 2017Publication date: June 28, 2018Applicant: Microsoft Technology Licensing, LLCInventors: Sridhar Srinivasan, Shankar Regunathan
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Patent number: 9892175Abstract: A mechanism for providing a preview of a data set. The search system finds a data set relevant to the search query. For any given data set, the search system extracts only a sample of elements from the data set. The sample of elements provided to the requestor includes elements for which there is a match on the search query, and elements that have no hit, but are proximate to an element that has a hit. The user obtains a view constructed of the sample of elements provided by the search system. The user is also provided with navigation controls that correspond to the most search-relevant portions of the view. Controls associated with those portion(s) may then be selected to thereby move the preview of the data set so that the portion or corresponding hit for that portion is in view.Type: GrantFiled: June 19, 2017Date of Patent: February 13, 2018Assignee: Microsoft Technology Licensing, LLCInventors: Cheryl Couris, Jason Walken Falk, Drew Voegele, Jean-Sebastien Brunner, Konstantin Zoryn, Roman Kogan, Francesco Lunetta, Shankar Gopalakrishnan, Miguel Llopis, Shankar Regunathan
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Patent number: 9866871Abstract: Various new and non-obvious apparatus and methods for using frame caching to improve packet loss recovery are disclosed. One of the disclosed embodiments is a method for using periodical and synchronized frame caching within an encoder and its corresponding decoder. When the decoder discovers packet loss, it informs the encoder which then generates a frame based on one of the shared frames stored at both the encoder and the decoder. When the decoder receives this generated frame it can decode it using its locally cached frame.Type: GrantFiled: January 17, 2014Date of Patent: January 9, 2018Assignee: Microsoft Technology Licensing, LLCInventors: Chih-Lung Lin, Minghui Xia, Pohsiang Hsu, Shankar Regunathan, Thomas W. Holcomb
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Patent number: 9843822Abstract: 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: May 9, 2016Date of Patent: December 12, 2017Assignee: Microsoft Technology Licensing, LLCInventors: Sridhar Srinivasan, Shankar Regunathan
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Patent number: 9817100Abstract: An array of microphones placed on a mobile robot provides multiple channels of audio signals. A received set of audio signals is called an audio segment, which is divided into multiple frames. A phase analysis is performed on a frame of the signals from each pair of microphones. If both microphones are in an active state during the frame, a candidate angle is generated for each such pair of microphones. The result is a list of candidate angles for the frame. This list is processed to select a final candidate angle for the frame. The list of candidate angles is tracked over time to assist in the process of selecting the final candidate angle for an audio segment.Type: GrantFiled: August 19, 2016Date of Patent: November 14, 2017Assignee: Microsoft Technology Licensing, LLCInventors: Shankar Regunathan, Kazuhito Koishida, Harshavardhana Narayana Kikkeri
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Publication number: 20170286501Abstract: A mechanism for providing a preview of a data set. The search system finds a data set relevant to the search query. For any given data set, the search system extracts only a sample of elements from the data set. The sample of elements provided to the requestor includes elements for which there is a match on the search query, and elements that have no hit, but are proximate to an element that has a hit. The user obtains a view constructed of the sample of elements provided by the search system. The user is also provided with navigation controls that correspond to the most search-relevant portions of the view. Controls associated with those portion(s) may then be selected to thereby move the preview of the data set so that the portion or corresponding hit for that portion is in view.Type: ApplicationFiled: June 19, 2017Publication date: October 5, 2017Inventors: Cheryl Couris, Jason Walken Falk, Drew Voegele, Jean-Sebastien Brunner, Konstantin Zoryn, Roman Kogan, Francesco Lunetta, Shankar Gopalakrishnan, Miguel Llopis, Shankar Regunathan
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Patent number: 9710526Abstract: A mechanism for providing a preview of a data set. The search system finds a data set relevant to the search query. For any given data set, the search system extracts only a sample of elements from the data set. The sample of elements provided to the requestor includes elements for which there is a match on the search query, and elements that have no hit, but are proximate to an element that has a hit. The user obtains a view constructed of the sample of elements provided by the search system. The user is also provided with navigation controls that correspond to the most search-relevant portions of the view. Controls associated with those portion(s) may then be selected to thereby move the preview of the data set so that the portion or corresponding hit for that portion is in view.Type: GrantFiled: June 25, 2014Date of Patent: July 18, 2017Assignee: Microsoft Technology Licensing, LLCInventors: Cheryl Couris, Jason Walken Falk, Drew Voegele, Jean-Sebastien Brunner, Konstantin Zoryn, Roman Kogan, Francesco Lunetta, Shankar Gopalakrishnan, Miguel Llopis, Shankar Regunathan
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Publication number: 20170127085Abstract: Techniques and tools for conversion operations between modules in a scalable video encoding tool or scalable video decoding tool are described. For example, given reconstructed base layer video in a low resolution format (e.g., 4:2:0 video with 8 bits per sample) an encoding tool and decoding tool adaptively filter the reconstructed base layer video and upsample its sample values to a higher sample depth (e.g., 10 bits per sample). The tools also adaptively scale chroma samples to a higher chroma sampling rate (e.g., 4:2:2). The adaptive filtering and chroma scaling help reduce energy in inter-layer residual video by making the reconstructed base layer video closer to input video, which typically makes compression of the inter-layer residual video more efficient. The encoding tool also remaps sample values of the inter-layer residual video to adjust dynamic range before encoding, and the decoding tool performs inverse remapping after decoding.Type: ApplicationFiled: January 12, 2017Publication date: May 4, 2017Applicant: Microsoft Technology Licensing, LLCInventors: Shijun Sun, Shankar Regunathan, Chengjie Tu, Chih-Lung Lin
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Publication number: 20170111640Abstract: 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: December 27, 2016Publication date: April 20, 2017Applicant: Microsoft Technology Licensing, LLCInventors: Shankar Regunathan, Shijun Sun, Chengjie Tu, Chih-Lung Lin
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Publication number: 20170052245Abstract: An array of microphones placed on a mobile robot provides multiple channels of audio signals. A received set of audio signals is called an audio segment, which is divided into multiple frames. A phase analysis is performed on a frame of the signals from each pair of microphones. If both microphones are in an active state during the frame, a candidate angle is generated for each such pair of microphones. The result is a list of candidate angles for the frame. This list is processed to select a final candidate angle for the frame. The list of candidate angles is tracked over time to assist in the process of selecting the final candidate angle for an audio segment.Type: ApplicationFiled: August 19, 2016Publication date: February 23, 2017Inventors: Shankar Regunathan, Kazuhito Koishida, Harshavardhana Narayana Kikkeri
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Patent number: 9571840Abstract: 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: June 17, 2014Date of Patent: February 14, 2017Assignee: Microsoft Technology Licensing, LLCInventors: Shankar Regunathan, Shijun Sun, Chengjie Tu, Chih-Lung Lin
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Patent number: 9571856Abstract: Techniques and tools for conversion operations between modules in a scalable video encoding tool or scalable video decoding tool are described. For example, given reconstructed base layer video in a low resolution format (e.g., 4:2:0 video with 8 bits per sample) an encoding tool and decoding tool adaptively filter the reconstructed base layer video and upsample its sample values to a higher sample depth (e.g., 10 bits per sample). The tools also adaptively scale chroma samples to a higher chroma sampling rate (e.g., 4:2:2). The adaptive filtering and chroma scaling help reduce energy in inter-layer residual video by making the reconstructed base layer video closer to input video, which typically makes compression of the inter-layer residual video more efficient. The encoding tool also remaps sample values of the inter-layer residual video to adjust dynamic range before encoding, and the decoding tool performs inverse remapping after decoding.Type: GrantFiled: August 25, 2008Date of Patent: February 14, 2017Assignee: Microsoft Technology Licensing, LLCInventors: Shijun Sun, Shankar Regunathan, Chengjie Tu, Chih-Lung Lin
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Publication number: 20160366445Abstract: Various new and non-obvious apparatus and methods for using frame caching to improve packet loss recovery are disclosed. One of the disclosed embodiments is a method for using periodical and synchronized frame caching within an encoder and its corresponding decoder. When the decoder discovers packet loss, it informs the encoder which then generates a frame based on one of the shared frames stored at both the encoder and the decoder. When the decoder receives this generated frame it can decode it using its locally cached frame.Type: ApplicationFiled: April 11, 2016Publication date: December 15, 2016Applicant: Microsoft Technology Licensing, LLCInventors: Chih-Lung Lin, Minghui Xia, Pohsiang Hsu, Shankar Regunathan, Thomas W. Holcomb
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Publication number: 20160323601Abstract: 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: May 9, 2016Publication date: November 3, 2016Applicant: Microsoft Technology Licensing, LLCInventors: Sridhar Srinivasan, Shankar Regunathan
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Patent number: 9435873Abstract: An array of microphones placed on a mobile robot provides multiple channels of audio signals. A received set of audio signals is called an audio segment, which is divided into multiple frames. A phase analysis is performed on a frame of the signals from each pair of microphones. If both microphones are in an active state during the frame, a candidate angle is generated for each such pair of microphones. The result is a list of candidate angles for the frame. This list is processed to select a final candidate angle for the frame. The list of candidate angles is tracked over time to assist in the process of selecting the final candidate angle for an audio segment.Type: GrantFiled: July 14, 2011Date of Patent: September 6, 2016Assignee: Microsoft Technology Licensing, LLCInventors: Shankar Regunathan, Kazuhito Koishida, Harshavardhana Narayana Kikkeri
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Patent number: 9398314Abstract: Architecture for enhancing the compression (e.g., luma, chroma) of a video signal and improving the perceptual quality of the video compression schemes. The architecture operates to reshape the normal multimodal energy distribution of the input video signal to a new energy distribution. In the context of luma, the algorithm maps the black and white (or contrast) information of a picture to a new energy distribution. For example, the contrast can be enhanced in the middle range of the luma spectrum, thereby improving the contrast between a light foreground object and a dark background. At the same time, the algorithm reduces the bit-rate requirements at a particular quantization step size. The algorithm can be utilized also in post-processing to improve the quality of decoded video.Type: GrantFiled: February 5, 2008Date of Patent: July 19, 2016Assignee: Microsoft Technology Licensing, LLCInventors: Walid Ali, Shankar Regunathan, Guo-Wei Shieh, Bruce Lin, Bharath Siravara, Ce Wang
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Publication number: 20160198164Abstract: 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: March 11, 2016Publication date: July 7, 2016Applicant: Microsoft Technology Licensing, LLCInventors: Chih-Lung Lin, Shankar Regunathan, Sridhar Srinivasan
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Patent number: 9363536Abstract: 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: August 13, 2012Date of Patent: June 7, 2016Assignee: Microsoft Technology Licensing, LLCInventors: Sridhar Srinivasan, Shankar Regunathan
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Patent number: 9313509Abstract: 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 14, 2010Date of Patent: April 12, 2016Assignee: Microsoft Technology Licensing, LLCInventors: Chih-Lung Lin, Shankar Regunathan, Sridhar Srinivasan