Patents by Inventor Gopi Lakshminarayanan

Gopi Lakshminarayanan 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).

  • Patent number: 10930223
    Abstract: Methods are disclosed for ambient light-adaptive display management. Given an input image, image metadata, an ambient-light signal, and parameters characterizing a target display, a processor generates an ambient-light adjustment function which maps input luminance values in a reference viewing environment to output luminance values in a target viewing environment, wherein the target viewing environment is determined based on the ambient-light signal. The ambient-light adjustment function is applied to the input image and the input metadata to generate a virtual image and new metadata. A tone-mapping function based on the new metadata and target display parameters is applied to the virtual image to generate an output image. The parameters for the target display are computed based on the ambient-light signal, global dimming metadata, and the luminance characteristics of the target display.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: February 23, 2021
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Jaclyn Anne Pytlarz, Robin Atkins, Gopi Lakshminarayanan, Hariharan Ganapathy Kathirvelu
  • Publication number: 20190304379
    Abstract: Methods are disclosed for ambient light-adaptive display management. Given an input image, image metadata, an ambient-light signal, and parameters characterizing a target display, a processor generates an ambient-light adjustment function which maps input luminance values in a reference viewing environment to output luminance values in a target viewing environment, wherein the target viewing environment is determined based on the ambient-light signal. The ambient-light adjustment function is applied to the input image and the input metadata to generate a virtual image and new metadata. A tone-mapping function based on the new metadata and target display parameters is applied to the virtual image to generate an output image. The parameters for the target display are computed based on the ambient-light signal, global dimming metadata, and the luminance characteristics of the target display.
    Type: Application
    Filed: December 20, 2017
    Publication date: October 3, 2019
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Jaclyn Anne Pytlarz, Robin Atkins, Gopi Lakshminarayanan, Hariharan Ganapathy Kathirvelu
  • Patent number: 10165251
    Abstract: Stereoscopic video data and corresponding depth map data for stereoscopic and auto-stereoscopic displays are coded using a coded base layer and one or more coded enhancement layers. Given a 3D input picture and corresponding input depth map data, a side-by-side and a top-and-bottom picture are generated based on the input picture. Using an encoder, the side-by-side picture is coded to generate a coded base layer Using the encoder and a texture reference processing unit (RPU), the top-and-bottom picture is encoded to generate a first enhancement layer, wherein the first enhancement layer is coded based on the base layer stream, and using the encoder and a depth-map RPU, depth data for the side-by-side picture are encoded to generate a second enhancement layer, wherein the second enhancement layer is coded based on to the base layer. Alternative single, dual, and multi-layer depth map delivery systems are also presented.
    Type: Grant
    Filed: June 12, 2013
    Date of Patent: December 25, 2018
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Gopi Lakshminarayanan, Samir Hulyalkar, Tao Chen, Klaas Heinrich Schueuer, Amit Gulati, Hariharan Ganapathy, Philipp Kraetzer
  • Patent number: 10097820
    Abstract: A high resolution 3D image may be encoded into a first multiplexed image frame and a second multiplexed image frame in a base layer (BL) video signal and an enhancement layer (EL) video signal. The first multiplexed image frame may comprise horizontal high resolution image data for both eyes, while the second multiplexed image frame may comprise vertical high resolution image data for both eyes. Encoded symmetric-resolution image data for the 3D image may be distributed to a wide variety of devices for 3D image processing and rendering. A recipient device may reconstruct reduced resolution 3D image from one of the first multiplexed image frame or the second multiplexed image frame. A recipient device may also reconstruct high resolution 3D image by combining high resolution image data from both of the first multiplexed image frame and the second multiplexed image frame.
    Type: Grant
    Filed: September 27, 2012
    Date of Patent: October 9, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Tao Chen, Hariharan Ganapathy, I, Samir N. Hulyalkar, Gopi Lakshminarayanan, Peng Yin, Taoran Lu, Walter J. Husak
  • Publication number: 20160029012
    Abstract: The present invention relates to a method and system for generating and retargeting a three-dimensiona video signal for use on a target three-dimensional display device, wherein the three-dimensional video signal comprises three-dimensional video data suitable for driving a multi-view display device and reference disparity mapping data, the reference disparity mapping data indicative of a disparity mapping for the three-dimensional video data for a reference three-dimensional display device and wherein a target disparity mapping is derived based on the reference disparity mapping and characteristics of the reference three-dimensional display device and corresponding characteristics of the target three-dimensional display device, the resulting target disparity mapping is used for retargeting the three-dimensional video data using the target disparity mapping data into a target three-dimensional video data.
    Type: Application
    Filed: April 4, 2014
    Publication date: January 28, 2016
    Inventors: WILHELMUS HENDRIKUS ALFONSUS BRULS, WIEBE DE HAAN, BART KROON, PATRICK LUC ELS VANDEWALLE, GOPI LAKSHMINARAYANAN
  • Publication number: 20150201178
    Abstract: Stereoscopic video data and corresponding depth map data for stereoscopic and auto-stereoscopic displays are coded using a coded base layer and one or more coded enhancement layers. Given a 3D input picture and corresponding input depth map data, a side-by-side and a top-and-bottom picture are generated based on the input picture. Using an encoder, the side-by-side picture is coded to generate a coded base layer Using the encoder and a texture reference processing unit (RPU), the top-and-bottom picture is encoded to generate a first enhancement layer, wherein the first enhancement layer is coded based on the base layer stream, and using the encoder and a depth-map RPU, depth data for the side-by-side picture are encoded to generate a second enhancement layer, wherein the second enhancement layer is coded based on to the base layer. Alternative single, dual, and multi-layer depth map delivery systems are also presented.
    Type: Application
    Filed: June 12, 2013
    Publication date: July 16, 2015
    Applicants: Dolby Laboratories Licensing Corporation, DOLBY INTERNATIONAL AB
    Inventors: Gopi Lakshminarayanan, Samir Hulyalkar, Tao Chen, Klaas Heinrich Schueuer, Amit Gulati, Hariharan Ganapathy, Philipp Kraetzer
  • Patent number: 9049445
    Abstract: Given an input progressive sequence, a video encoder creates a dual-layer stream that combines a backwards-compatible interlaced video stream layer with an enhancement layer to reconstruct full-resolution progressive video. Given two consecutive frames in the input progressive sequence, vertical processing generates a top field-bottom field (TFBF) frame in a base layer (BL) TFBF sequence, and horizontal processing generates a side-by-side (SBS) frame in an enhancement layer (EL) SBS video sequence. The BL TFBF and the EL SBS sequences are compressed together to create a coded, backwards compatible output stream.
    Type: Grant
    Filed: December 13, 2012
    Date of Patent: June 2, 2015
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Tao Chen, Hariharan Ganapathy-Kathirvelu, Samir N. Hulyalkar, Gopi Lakshminarayanan
  • Patent number: 8923403
    Abstract: 3D Images may be encoded into reduced resolution image data in a base layer and enhancement layer (EL) image data in one or more enhancement layers. Different types of data compositions may be used in the EL image data. The different types of data compositions may include unfiltered full resolution image data for one or both of left eye and right eye perspectives, or unfiltered full resolution image data for a color channel, e.g., luminance channel, or unfiltered full resolution image data for selected portions of image frames, or fallback data compositions. Based on deciding factors including bitrate requirements and bandwidth constraints, different types of data compositions may be alternatively used by an upstream device to deliver the best possible 3D image data to a wide variety of downstream devices. The upstream device may inform a downstream device of specific types of data compositions with EL image data descriptors.
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: December 30, 2014
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Tao Chen, Samir N. Hulyalkar, Gopi Lakshminarayanan
  • Publication number: 20140376612
    Abstract: Given an input progressive sequence, a video encoder creates a dual-layer stream that combines a backwards-compatible interlaced video stream layer with an enhancement layer to reconstruct full-resolution progressive video. Given two consecutive frames in the input progressive sequence, vertical processing generates a top field-bottom field (TFBF) frame in a base layer (BL) TFBF sequence, and horizontal processing generates a side-by-side (SBS) frame in an enhancement layer (EL) SBS video sequence. The BL TFBF and the EL SBS sequences are compressed together to create a coded, backwards compatible output stream.
    Type: Application
    Filed: December 13, 2012
    Publication date: December 25, 2014
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Tao Chen, Hariharan Ganapathy-Kathirvelu, Samir Hulyalkar, Gopi Lakshminarayanan
  • Publication number: 20140355693
    Abstract: 3D Images may be encoded into reduced resolution image data in a base layer and enhancement layer (EL) image data in one or more enhancement layers. Different types of data compositions may be used in the EL image data. The different types of data compositions may include unfiltered full resolution image data for one or both of left eye and right eye perspectives, or unfiltered full resolution image data for a color channel, e.g., luminance channel, or unfiltered full resolution image data for selected portions of image frames, or fallback data compositions. Based on deciding factors including bitrate requirements and bandwidth constraints, different types of data compositions may be alternatively used by an upstream device to deliver the best possible 3D image data to a wide variety of downstream devices. The upstream device may inform a downstream device of specific types of data compositions with EL image data descriptors.
    Type: Application
    Filed: September 26, 2012
    Publication date: December 4, 2014
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Tao Chen, Samir N. Hulyalkar, Gopi Lakshminarayanan
  • Publication number: 20140286397
    Abstract: A high resolution 3D image may be encoded into a first multiplexed image frame and a second multiplexed image frame in a base layer (BL) video signal and an enhancement layer (EL) video signal. The first multiplexed image frame may comprise horizontal high resolution image data for both eyes, while the second multiplexed image frame may comprise vertical high resolution image data for both eyes. Encoded symmetric-resolution image data for the 3D image may be distributed to a wide variety of devices for 3D image processing and rendering. A recipient device may reconstruct reduced resolution 3D image from one of the first multiplexed image frame or the second multiplexed image frame. A recipient device may also reconstruct high resolution 3D image by combining high resolution image data from both of the first multiplexed image frame and the second multiplexed image frame.
    Type: Application
    Filed: September 27, 2012
    Publication date: September 25, 2014
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Tao Chen, Hariharan Ganapathy, I, Samir N. Hulyalkar, Gopi Lakshminarayanan, Peng Yin, Taoran Lu, Walter J. Husak
  • Patent number: 8533515
    Abstract: A method for synchronizing secure clocks in a system without using any external clock, a system configured to perform the method, and a computer medium storing system code. Each secure clock is adjustable subject to a set of predetermined adjustment constraints. The intersection of the adjustment constraints of all the clocks is a limit intersection. The clocks may be synchronized to an average adjusted time of the secure clocks (if the average adjusted time is within the limit intersection) or to a substitute average adjusted time within the limit intersection if the average adjusted time is outside the limit intersection. Synchronization can occur in response to a request to adjust at least one of the clocks by a proposed clock adjustment value or to synchronize at least one of them without otherwise adjusting them.
    Type: Grant
    Filed: February 16, 2010
    Date of Patent: September 10, 2013
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Gopi Lakshminarayanan, Dossym Nurmukhanov, Sergio Martinez
  • Publication number: 20110302443
    Abstract: A method for synchronizing secure clocks in a system without using any external clock, a system configured to perform the method, and a computer medium storing system code. Each secure clock is adjustable subject to a set of predetermined adjustment constraints. The intersection of the adjustment constraints of all the clocks is a limit intersection. The clocks may be synchronized to an average adjusted time of the secure clocks (if the average adjusted time is within the limit intersection) or to a substitute average adjusted time within the limit intersection if the average adjusted time is outside the limit intersection. Synchronization can occur in response to a request to adjust at least one of the clocks by a proposed clock adjustment value or to synchronize at least one of them without otherwise adjusting them.
    Type: Application
    Filed: February 16, 2010
    Publication date: December 8, 2011
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Gopi Lakshminarayanan, Dossym Nurmukhanov, Sergio Martinez
  • Patent number: 7400653
    Abstract: A playback system in a digital cinema network synchronizes the presentation of visual and aural content by deriving timing information for packets of information that are conveyed in video and audio data streams, examining the timing information to determine if any misalignment between the two data streams is likely to be perceptible and, if the misalignment is deemed to be perceptible, introducing delays into one or both data streams to correct the misalignment. If the audio data stream precedes the video data stream, the audio data stream is delayed by an integer number of audio sample periods. If the video data stream precedes the audio data stream, the video data stream is delayed by an integer number of video frames and the audio data stream is delayed by an integer number of audio sample periods.
    Type: Grant
    Filed: June 18, 2004
    Date of Patent: July 15, 2008
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Trevor Davies, John David Couling, Gopi Lakshminarayanan, Martin John Richards
  • Publication number: 20060020690
    Abstract: The installation, maintenance and administration of digital cinema playback systems is facilitated by devices within the playback systems having operator-actuated controls that are used to specify a unique identifier for each playback system in a digital cinema complex. The identifier for a system is used to establish a set of network addresses for that playback system from which device addresses are assigned automatically. Subsequent communication between devices within a playback system use the assigned device addresses. These communications are used to alter the operation of devices, and for devices to publish the existence of and the need for specified services.
    Type: Application
    Filed: June 17, 2004
    Publication date: January 26, 2006
    Inventors: Martin Richards, Makarand Karanjkar, Douglas Mandell, Dean Bullock, Pierre-Anthony Lemieux, Gopi Lakshminarayanan
  • Publication number: 20050281255
    Abstract: A playback system in a digital cinema network synchronizes the presentation of visual and aural content by deriving timing information for packets of information that are conveyed in video and audio data streams, examining the timing information to determine if any misalignment between the two data streams is likely to be perceptible and, if the misalignment is deemed to be perceptible, introducing delays into one or both data streams to correct the misalignment. If the audio data stream precedes the video data stream, the audio data stream is delayed by an integer number of audio sample periods. If the video data stream precedes the audio data stream, the video data stream is delayed by an integer number of video frames and the audio data stream is delayed by an integer number of audio sample periods.
    Type: Application
    Filed: June 18, 2004
    Publication date: December 22, 2005
    Inventors: Trevor Davies, John Couling, Gopi Lakshminarayanan, Martin Richards