Patents by Inventor Murali Ramaswamy Chari
Murali Ramaswamy Chari 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: 8625902Abstract: In one example, an apparatus includes a processor configured to extract a first set of one or more keypoints from a first set of blurred images of a first octave of a received image, calculate a first set of one or more descriptors for the first set of keypoints, receive a confidence value for a result produced by querying a feature descriptor database with the first set of descriptors, wherein the result comprises information describing an identity of an object in the received image, and extract a second set of one or more keypoints from a second set of blurred images of a second octave of the received image when the confidence value does not exceed a confidence threshold. In this manner, the processor may perform incremental feature descriptor extraction, which may improve computational efficiency of object recognition in digital images.Type: GrantFiled: July 28, 2011Date of Patent: January 7, 2014Assignee: QUALCOMM IncorporatedInventors: Pawan Kumar Baheti, Sundeep Vaddadi, Ashwin Swaminathan, Yuriy Reznik, Onur C. Hamsici, Murali Ramaswamy Chari, John H. Hong, Chong Uk Lee
-
Publication number: 20130335554Abstract: A mobile device compensates for a lack of a time stamp when an image frame is captured by estimating the frame time stamp latency. The mobile device captures images frames and time stamps each frame after the frame time stamp latency. A vision based rotation is determined from a pair of frames. A plurality of inertia based rotations is measured using time stamped signals from an inertial sensor in the mobile device based on different possible delays between time stamping each frame and time stamps on the signals from the inertial sensors. The determined rotations may be about the camera's optical axis. The vision based rotation is compared to the plurality of inertia based rotations to determine an estimated frame time stamp latency, which is used to correct the frame time stamp latency when time stamping subsequently captured frames. A median latency determined using different frame pairs may be used.Type: ApplicationFiled: June 14, 2012Publication date: December 19, 2013Applicant: QUALCOMM IncorporatedInventors: Christopher Brunner, Mahesh Ramachandran, Arvind Ramanandan, Murali Ramaswamy Chari
-
Publication number: 20130335575Abstract: A reference in an unknown environment is generated on the fly for positioning and tracking. The reference is produced in a top down process by capturing an image of a planar object with a predefined geometric shape, detecting edge pixels of the planar object, then detecting a plurality of line segments from the edge pixels. The plurality of line segments may then be used to detect the planar object in the image based on the predefined geometric shape. An initial pose of the camera with respect to the planar object is determined and tracked using the edges of the planar object.Type: ApplicationFiled: June 14, 2012Publication date: December 19, 2013Applicant: QUALCOMM IncorporatedInventors: Yanghai Tsin, Prasun Choudhury, Murali Ramaswamy Chari
-
Publication number: 20130335562Abstract: A mobile device tracks a relative pose between a camera and a target using Vision aided Inertial Navigation System (VINS), that includes a contribution from inertial sensor measurements and a contribution from vision based measurements. When the mobile device detects movement of the target, the contribution from the inertial sensor measurements to track the relative pose between the camera and the target is reduced or eliminated. Movement of the target may be detected by comparing vision only measurements from captured images and inertia based measurements to determine if a discrepancy exists indicating that the target has moved. Additionally or alternatively, movement of the target may be detected using projections of feature vectors extracted from captured images.Type: ApplicationFiled: June 14, 2012Publication date: December 19, 2013Applicant: QUALCOMM IncorporatedInventors: Arvind Ramanandan, Christopher Brunner, Mahesh Ramachandran, Abhishek Tyagi, Daniel Knoblauch, Murali Ramaswamy Chari
-
Patent number: 8605705Abstract: Techniques for multiplexing and transmitting multiple data streams are described. Transmission of the multiple data streams occurs in “super-frames”. Each super-frame has a predetermined time duration and is further divided into multiple (e.g., four) frames. Each data block for each data stream is outer encoded to generate a corresponding code block. Each code block is partitioned into multiple subblocks, and each data packet in each code block is inner encoded and modulated to generate modulation symbols for the packet. The multiple subblocks for each code block are transmitted in the multiple frames of the same super-frame, one subblock per frame. Each data stream is allocated a number of transmission units in each super-frame and is assigned specific transmission units to achieve efficient packing. A wireless device can select and receive individual data streams.Type: GrantFiled: May 21, 2007Date of Patent: December 10, 2013Assignee: QUALCOMM IncorporatedInventors: Rajiv Vijayan, Aamod Khandekar, Fuyun Ling, Gordon Kent Walker, Murali Ramaswamy Chari
-
Patent number: 8509051Abstract: Techniques for multiplexing and transmitting multiple data streams are described. Transmission of the multiple data streams occurs in “super-frames”. Each super-frame has a predetermined time duration and is further divided into multiple (e.g., four) frames. Each data block for each data stream is outer encoded to generate a corresponding code block. Each code block is partitioned into multiple subblocks, and each data packet in each code block is inner encoded and modulated to generate modulation symbols for the packet. The multiple subblocks for each code block are transmitted in the multiple frames of the same super-frame, one subblock per frame. Each data stream is allocated a number of transmission units in each super-frame and is assigned specific transmission units to achieve efficient packing. A wireless device can select and receive individual data streams.Type: GrantFiled: October 31, 2007Date of Patent: August 13, 2013Assignee: QUALCOMM IncorporatedInventors: Fuyun Ling, Murali Ramaswamy Chari, Ashok Mantravadi, Raghuraman Krishnamoorthi
-
Patent number: 8489124Abstract: Methods and apparatus for position location in a wireless network. In an aspect, a method is provided that includes determining whether a symbol to be transmitted is an active symbol, wherein the symbol comprises a plurality of subcarriers, and encoding identification information on a first portion of subcarriers if it is determined that the symbol is the active symbol. The method also includes encoding idle information on a second portion of subcarriers if it is determined that the symbol in not the active symbol. In an aspect, an apparatus includes detector logic configured to decode a plurality of symbols to determine identification information that identifies a plurality of transmitters, and to determine a plurality of channel estimate associated with the plurality of transmitters. The apparatus also includes position determination logic configured to calculate a device position based on the plurality of transmitters and the plurality of channel estimates.Type: GrantFiled: December 18, 2008Date of Patent: July 16, 2013Assignee: Qualcomm IncorporatedInventors: Krishna Kiran Mukkavilli, Fuyun Ling, Gordon Kent Walker, Murali Ramaswamy Chari
-
Publication number: 20130156124Abstract: A system and method for frequency diversity uses interleaving in a wireless communication system utilizing orthogonal frequency division multiplexing (OFDM) with various FFT sizes. Subcarriers of one or more interlaces are interleaved in a bit reversal fashion and the one or more interlaces are interleaved in the bit reversal fashion.Type: ApplicationFiled: February 14, 2013Publication date: June 20, 2013Applicant: Qualcomm IncorporatedInventors: Michael Mao Wang, Murali Ramaswamy Chari, Ashok Mantravadi, Fuyun Ling, Rajiv Vijayan, Raghuraman Krishnamoorthi
-
Patent number: 8433016Abstract: The disclosure is directed to a receiver, and methods therefor, including an automatic gain control circuit with a first digital variable gain amplifier that outputs digital samples based on a modulated wireless signal, an interference canceller configured to filter the digital samples using a least mean squares algorithm to reduce narrowband interference, and a second DVGA configured to amplify the filtered digital samples.Type: GrantFiled: May 14, 2010Date of Patent: April 30, 2013Assignee: Qualcomm IncorporatedInventors: Bojan Vrcelj, Ashok Mantravadi, Fuyun Ling, Linbo Li, Raghuraman Krishnamoorthi, Murali Ramaswamy Chari, Vinay Murthy
-
Patent number: 8311133Abstract: A new channel is added to FLO networks that carries embedded signaling parameter information. The design is such that regardless of the actual values of the signaling parameters conveyed, a receiver will be able to demodulate this new channel. Moreover, the addition of the new channel does not render a FLO network that has been so configured to not be backwards-compatible with existing devices.Type: GrantFiled: August 6, 2007Date of Patent: November 13, 2012Assignee: QUALCOMM IncorporatedInventors: Durk L. van Veen, Ashok Mantravadi, Raghuraman Krishnamoorthi, Murali Ramaswamy Chari, Krishna Kiran Mukkavilli, Fuyun Ling
-
Patent number: 8280368Abstract: The disclosure is directed to a mobile communication device that determines when a performance disruption indicates a loss of synchronization with a broadcast signal and, in response, initiates reacquisition of the signal. Reacquisition techniques may include identifying and decoding only select portions of header information in the broadcast signal. Reacquisition may also be initiated in response to one or more deterministic triggers and during a test mode of operation.Type: GrantFiled: April 4, 2006Date of Patent: October 2, 2012Assignee: Qualcomm IncorporatedInventors: Ashok Mantravadi, Dhinakar Radhakrishnan, Murali Ramaswamy Chari
-
Patent number: 8189539Abstract: A system and method for frequency diversity uses interleaving. Subcarriers of an interlace are interleaved in a bit reversal fashion and the interlaces are interleaved in the bit reversal fashion.Type: GrantFiled: July 29, 2005Date of Patent: May 29, 2012Assignee: QUALCOMM IncorporatedInventors: Michael Mao Wang, Fuyun Ling, Murali Ramaswamy Chari, Rajiv Vijayan
-
Patent number: 8170059Abstract: Systems and methods are provided for processing forward link only (FLO) messages. A device for processing forward link only (FLO) wireless messages comprises receiving a FLO message and processing the FLO message including a header, an 8-bit FLO information block field, a 7-bit FLO count, an RF channel identifier, a transmit mode indicator, an outer code rate, and a stream identifier.Type: GrantFiled: July 27, 2006Date of Patent: May 1, 2012Assignee: Qualcomm IncorporatedInventors: Bruce Collins, Rajeev Krishnamurthi, Shusheel Gautam, Murali Ramaswamy Chari
-
Publication number: 20120027290Abstract: In one example, an apparatus includes a processor configured to extract a first set of one or more keypoints from a first set of blurred images of a first octave of a received image, calculate a first set of one or more descriptors for the first set of keypoints, receive a confidence value for a result produced by querying a feature descriptor database with the first set of descriptors, wherein the result comprises information describing an identity of an object in the received image, and extract a second set of one or more keypoints from a second set of blurred images of a second octave of the received image when the confidence value does not exceed a confidence threshold. In this manner, the processor may perform incremental feature descriptor extraction, which may improve computational efficiency of object recognition in digital images.Type: ApplicationFiled: July 28, 2011Publication date: February 2, 2012Applicant: QUALCOMM INCORPORATEDInventors: Pawan Kumar Baheti, Sundeep Vaddadi, Ashwin Swaminathan, Yuriy Reznik, Onur C. Hamsici, Murali Ramaswamy Chari, John H. Hong, Chong Uk Lee
-
Patent number: 8102756Abstract: A method of acquiring a forward link only (FLO) network in a radio frequency (RF) in a wireless communication environment, includes selecting a RF from a first list; selecting a signal parameter (SP) from a second list; determining if a first parameter is found using the selected RF and SP; and, upon determination that the first parameter is found, enabling the use of the selected RF and SP to communicate in the FLO network. An apparatus for implementing the method is also disclosed.Type: GrantFiled: August 6, 2007Date of Patent: January 24, 2012Assignee: QUALCOMM IncorporatedInventors: Krishna Kiran Mukkavilli, Ashok Mantravadi, Raghuraman Krishnamoorthi, Murali Ramaswamy Chari, Tao Tian
-
Publication number: 20120011142Abstract: A database for object recognition is modified based on feedback information received from a mobile platform. The feedback information includes information with respect to an image of an object captured by the mobile platform. The feedback information, for example, may include the image, features extracted from the image, a confidence level for the features, posterior probabilities of the features belonging to an object in the database, GPS information, and heading orientation information. The feedback information may be used to improve the database pruning, add content to the database or update the database compression efficiency. The information feedback to the server by the mobile platform may be determined based on a search of a portion of the database performed by the mobile platform using features extracted from a captured query image.Type: ApplicationFiled: July 8, 2010Publication date: January 12, 2012Applicant: QUALCOMM IncorporatedInventors: Pawan K. Baheti, Ashwin Swaminathan, Serafin Diaz Spindola, Murali Ramaswamy Chari
-
Patent number: 7948907Abstract: The disclosure is directed to a mobile communication device that may receive wireless broadcast signals from a number of different base stations or transmitters. As the location of the device moves relative to the transmitters, one transmitter will likely be identified as the transmitter broadcast the strongest, or highest quality, signal. When that determination is made, the user of the mobile device is presented the opportunity to switch to receiving that transmitters signal. Based on the user's reply, the device may remain with the current transmitter, even though it does not have the strongest signal, or the device may be configured to acquire and start receiving the new transmitter's signal. The measuring of the quality of a transmitter's signal may be based on a composite score that combines a number of individual measurements made over a predetermined period of time.Type: GrantFiled: January 30, 2006Date of Patent: May 24, 2011Assignee: QUALCOMM IncorporatedInventors: Michael Mao Wang, Ashok Mantravadi, Murali Ramaswamy Chari
-
Publication number: 20100220821Abstract: The disclosure is directed to a receiver, and methods therefor, including an automatic gain control circuit with a first digital variable gain amplifier that outputs digital samples based on a modulated wireless signal, an interference canceller configured to filter the digital samples using a least mean squares algorithm to reduce narrowband interference, and a second DVGA configured to amplify the filtered digital samples.Type: ApplicationFiled: May 14, 2010Publication date: September 2, 2010Applicant: QUALCOMM IncorporatedInventors: BOJAN VRCELJ, Ashok Mantravadi, Fuyun Ling, Linbo Li, Raghuraman Krishnamoorthi, Murali Ramaswamy Chari, Vinay Murthy
-
Publication number: 20100220816Abstract: A wireless communication apparatus in a hierarchically coded modulation system can use error control mechanisms generated during decoding of base layer information to predict a probability of successful demodulation of enhancement layer information. Performance in the demodulation of the base layer correlates to performance in the demodulation of the enhancement layer. The receiver can determine whether to attempt demodulation of temporally correlated enhancement layer data based in part on the predicted probability of success. If the receiver determines not to demodulate the enhancement layer, the receiver can power down the enhancement layer demodulator, or otherwise minimize the power expended in the enhancement layer demodulator.Type: ApplicationFiled: May 11, 2010Publication date: September 2, 2010Applicant: QUALCOMM IncorporatedInventors: Gordon Kent Walker, Rajiv Vijayan, Seong Taek Chung, Murali Ramaswamy Chari, Fuyun Ling
-
Publication number: 20100150131Abstract: In a multicasts wireless telecommunication system providing an aggregation of one or more independent data components as a flow, wherein the OIS is located at the latch point of the beginning of the superframe, and the OIS programming is latched at the superframe boundary, the improvement of deriving signal parameter information from Signaling Parameter Channel (SPC) symbols transmitted in a Forward Link only (FLO) network by deriving a time domain channel estimate by assuming each of the combinations for the signal parameter field in the scrambler seed and picking the signal parameter combination that yields the most energy in the time domain above a threshold value.Type: ApplicationFiled: July 27, 2009Publication date: June 17, 2010Applicant: QUALCOMM INCORPORATEDInventors: Krishna Kiran Mukkavilli, Ashok Mantravadi, Durk L. van Veen, Murali Ramaswamy Chari, Raghuraman Krishnamoorthi, Rajeev Krishnamurthi, Fuyun Ling