Patents by Inventor Lu Chang

Lu Chang 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: 11082566
    Abstract: A chart for calibrating a system of multiple cameras, the chart comprising: a background; an array of dots contrasting the background, wherein the array of dots are arranged in rows and columns, wherein the array of dots comprise a first dot array, and a second dot array, wherein the first dot array fully occupies a first region of evenly spaced dots with a first dot density, the second dot array fully occupies a second region of evenly spaced dots with a second dot density, and wherein the second region is enclosed within the first region; a group of first markers in the first region, a group of second markers in the second region, and a third marker at the center of the chart, wherein each second marker is closer to the third marker than each first marker.
    Type: Grant
    Filed: June 20, 2017
    Date of Patent: August 3, 2021
    Assignee: OmniVision Technologies, Inc.
    Inventors: Shan Xu, Xinting Gao, Bin Chen, Ye Tao, Guansong Liu, Lu Chang
  • Patent number: 10957186
    Abstract: A surveillance system includes an infrared sensor system coupled to output an infrared signal in response to receiving infrared light, and an audio recording system coupled to output an audio signal in response to recording sound. An image sensor is system coupled to output an image signal in response to receiving image light. A controller is coupled to the infrared sensor system, the audio recording system, and the image sensor system. The controller includes logic that when executed by the controller causes the surveillance system to perform operations including receiving the infrared signal from the infrared sensor system, activating the audio recording system to record the sound, and activating the image sensor system to output the image signal.
    Type: Grant
    Filed: November 29, 2018
    Date of Patent: March 23, 2021
    Assignee: OmniVision Technologies, Inc.
    Inventors: Cheng-Lun Hu, Dong Shi, Chung-An Wang, Lu Chang
  • Patent number: 10841558
    Abstract: A multiple camera imaging system comprises a first camera image sensor to obtain a first image of a scene and a second camera image sensor to obtain a second image. The system further comprises an image signal processor (ISP) to produce a first roughly-aligned image from the first image and a second roughly-aligned image from the second image. A feature point in the first roughly-aligned image is identified. A center of a search zone is created, which is a combination of the position of the feature point and an associated disparity value from the first and second roughly-aligned images. The search zone is created within the second roughly-aligned image. Candidate feature points are identified within the search zone, which is much smaller than the entire image. A best-matched feature point pair in the first roughly-aligned image and the second roughly-aligned image is then identified.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: November 17, 2020
    Assignee: OmniVision Technologies, Inc.
    Inventors: Xinting Gao, Wenshou Chen, Shan Xu, Yanfang Huang, Guansong Liu, Lu Chang
  • Publication number: 20200175845
    Abstract: A surveillance system includes an infrared sensor system coupled to output an infrared signal in response to receiving infrared light, and an audio recording system coupled to output an audio signal in response to recording sound. An image sensor is system coupled to output an image signal in response to receiving image light. A controller is coupled to the infrared sensor system, the audio recording system, and the image sensor system. The controller includes logic that when executed by the controller causes the surveillance system to perform operations including receiving the infrared signal from the infrared sensor system, activating the audio recording system to record the sound, and activating the image sensor system to output the image signal.
    Type: Application
    Filed: November 29, 2018
    Publication date: June 4, 2020
    Inventors: Cheng-Lun Hu, Dong Shi, Chung-An Wang, Lu Chang
  • Patent number: 10360662
    Abstract: A multiple camera imaging system, comprising a first camera image sensor configured to obtain a first image of a scene from a first vantage perspective point; a second camera image sensor configured to obtain a second image of the scene from a second vantage perspective point; and an image signal processor (ISP), configured to process the first image and the second image by performing the following steps: producing a first monotone image from the first image, and a second monotone image from the second image; projecting the first monotone image to produce a first one-dimensional profile; and projecting the second monotone image to produce a second one-dimensional profile; extracting a matching information from the first and second one-dimensional profiles by matching the second one-dimensional profile to the first one dimensional profile; using the matching information produce a first processed two-dimensional image, and a second processed two-dimensional image that is aligned with the first processed two-dim
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: July 23, 2019
    Assignee: OmniVision Technologies, Inc.
    Inventors: Xinting Gao, Shan Xu, Shimiao Li, Ying Zhou, Guansong Liu, Lu Chang
  • Publication number: 20190158799
    Abstract: A multiple camera imaging system, comprising: a first camera image sensor configured to obtain a first image of a scene from a first vantage perspective point; a second camera image sensor configured to obtain a second image of the scene from a second vantage perspective point; and an image signal processor (ISP), configured to process the first image and the second image by performing the following steps: producing a first roughly-aligned image from the first image, and a second roughly-aligned image from the second image; using the first and second roughly-aligned images to produce a disparity image; identifying a feature point within the first roughly-aligned image; utilizing the disparity image to create a search zone within the second roughly-aligned image; and identifying a group of candidate feature points within the search zone; identifying within the search zone a best-matched candidate feature point that best matches the feature point within the first roughly-aligned image to form a best-matched fea
    Type: Application
    Filed: November 17, 2017
    Publication date: May 23, 2019
    Inventors: Xinting Gao, Wenshou Chen, Shan Xu, Yanfang Huang, Guansong Liu, Lu Chang
  • Publication number: 20190114739
    Abstract: A multiple camera imaging system, comprising a first camera image sensor configured to obtain a first image of a scene from a first vantage perspective point; a second camera image sensor configured to obtain a second image of the scene from a second vantage perspective point; and an image signal processor (ISP), configured to process the first image and the second image by performing the following steps: producing a first monotone image from the first image, and a second monotone image from the second image; projecting the first monotone image to produce a first one-dimensional profile; and projecting the second monotone image to produce a second one-dimensional profile; extracting a matching information from the first and second one-dimensional profiles by matching the second one-dimensional profile to the first one dimensional profile; using the matching information produce a first processed two-dimensional image, and a second processed two-dimensional image that is aligned with the first processed two-dim
    Type: Application
    Filed: October 16, 2017
    Publication date: April 18, 2019
    Inventors: Xinting Gao, Shan Xu, Shimiao Li, Ying Zhou, Guansong Liu, Lu Chang
  • Publication number: 20180367681
    Abstract: A chart for calibrating a system of multiple cameras, the chart comprising: a background; an array of dots contrasting the background, wherein the array of dots are arranged in rows and columns, wherein the array of dots comprise a first dot array, and a second dot array, wherein the first dot array fully occupies a first region of evenly spaced dots with a first dot density, the second dot array fully occupies a second region of evenly spaced dots with a second dot density, and wherein the second region is enclosed within the first region; a group of first markers in the first region, a group of second markers in the second region, and a third marker at the center of the chart, wherein each second marker is closer to the third marker than each first marker.
    Type: Application
    Filed: June 20, 2017
    Publication date: December 20, 2018
    Inventors: Shan Xu, Xinting Gao, Bin Chen, Ye Tao, Guansong Liu, Lu Chang
  • Patent number: 9332485
    Abstract: An integrated circuit includes a control module and a physical layer device. The control module (i) during each of multiple beacon intervals, operates a mobile device in a sleep mode or a listen mode, and (ii) for each of the beacon intervals, selects a length of the sleep mode or the listen mode such that resulting lengths of the sleep mode or the listen mode vary randomly. The control module partially or fully powers down the mobile device during the sleep mode. The physical layer device (i) wirelessly transmits, while the control module operates the mobile device in an active mode, a signal to discover one or more peers in a peer-to-peer network, and (ii) while the control module is operating the mobile device in the listen mode, receives responses to the signal. The control module determines which of the peers are discoverable based on the responses.
    Type: Grant
    Filed: April 22, 2013
    Date of Patent: May 3, 2016
    Assignee: Marvell International Ltd.
    Inventors: Paul A. Lambert, Lu Chang
  • Patent number: 8937963
    Abstract: A system is provided and includes a buffer, an interface, a processor, and an output device. The interface is configured to receive a packet from a network. The processor is configured to: determine a delay of the network in transmitting the packet; prior to storing the packet in the buffer, determine statistics of the buffer, and an amount the buffer is filled; determine a predetermined delay of the buffer based on the delay of the network, and the statistics; estimate an actual delay of the buffer for the packet based on the amount the buffer is filled; generate an error signal based on the predetermined delay and the actual delay; and based on the error signal, one of compress and expand the packet to change a first length of the packet to a second length. The output device is configured to output the packet based on the second length.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: January 20, 2015
    Assignee: Pico Mobile Networks, Inc.
    Inventors: Madihally J. Narasimha, Lu Chang
  • Patent number: 8918051
    Abstract: A mobile device includes a first interface module, a second interface module, and a control module. The first interface module is configured to interface the mobile device to a first wireless network and to receive data from a transmitting device via the first wireless network. The second interface module is configured to interface the mobile device to a second wireless network. The control module is configured to determine based on the data received when to switch a link to the transmitting device from the first wireless network to the second wireless network. The control module is further configured to transmit a message that informs the transmitting device not to transmit the data to the mobile device via the first wireless network in response to the link being switched to the second wireless network.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: December 23, 2014
    Assignee: Marvell International Ltd.
    Inventors: Lu Chang, Paul A. Lambert
  • Patent number: 8825016
    Abstract: A first device including a transmitter, a receiver, and a processor. The transmitter is configured to wirelessly transmit a query to a second device that is remote from the first device. The query is configured to not generate an alert to a user of the second device in response to the second device receiving the query. The receiver is configured to wirelessly receive data from the second device in response to the query transmitted to the second device. The data indicates whether the second device is (i) busy and cannot currently communicate with the first device or (ii) not busy and can currently communicate with the first device. The processor is configured to determine, based on whether the second device is (i) busy and cannot currently communicate with the first device or (ii) not busy and can currently communicate with the first device, whether to communicate with the second device.
    Type: Grant
    Filed: February 11, 2013
    Date of Patent: September 2, 2014
    Assignee: PICO Mobile Networks, Inc.
    Inventors: Paul Lambert, Lu Chang
  • Patent number: 8428079
    Abstract: An integrated circuit configured to operate in a mobile device includes a discovery generator module. The discovery generator module is configured to generate a corresponding random value for each beacon interval. A discovery control module is configured to determine a duration of time of a given beacon interval in which the mobile device is to operate in at least one of an active mode and a sleep mode. The duration of time is based on the corresponding random value generated for the given beacon interval. A physical layer (PHY) device is configured to wirelessly transmit a discovery request signal during the time the mobile device is operating in the active mode. The mobile device is partially powered down or fully powered down during the time the mobile device is operating in the sleep mode.
    Type: Grant
    Filed: September 21, 2009
    Date of Patent: April 23, 2013
    Assignee: Marvell International, Ltd
    Inventors: Paul A. Lambert, Lu Chang
  • Patent number: 8374584
    Abstract: A first mobile, wireless communication device including a memory and a communication module. The memory is configured to store data associating a first user of the first mobile, wireless communication device with a second user of a second mobile, wireless communication device. The communication module is configured to, based on the data associating the first user of the first mobile, wireless communication device with the second user of the second mobile, wireless communication device, establish a communication link between the first mobile, wireless communication device and the second mobile, wireless communication device. In response to the second user being within a predetermined range of the first user, the first mobile, wireless communication device is configured to automatically receive, via the communication link, notification that the second user is within the predetermined range of the first user.
    Type: Grant
    Filed: June 27, 2011
    Date of Patent: February 12, 2013
    Assignee: PICO Mobile Networks, Inc.
    Inventors: Paul Lambert, Lu Chang
  • Patent number: 8279884
    Abstract: The present invention is a method of correcting packet discontinuities using the steps of: (A) generating a continuous real time data stream from input of media content from a media source comprising packets transmitted by way of a computer packet network to a specific receiving device to establish a transmission portion of an end to end communication, (B) a jitter buffer receiving real time data stream packets from the packet network and temporarily storing at least some of them in the jitter buffer, (C) the jitter buffer operating on multiple fixed length packets to output a first output of a predetermined sequence of said fixed length packets, preferably substantially as they were originally transmitted, (D) a control unit receiving the first output and changing the length of one or more of fixed length packets of the first output to form a second output in response to a detected delay or other discontinuity in the packet sequence, (E) a playout buffer receiving the second output and operating on the stre
    Type: Grant
    Filed: June 18, 2007
    Date of Patent: October 2, 2012
    Assignee: Pico Mobile Networks, Inc.
    Inventors: Madihally J. Narasimha, Lu Chang
  • Patent number: 7970384
    Abstract: The present invention is a phonebook system including a mobile, wireless communications device having a microprocessor and user interface giving the user the capability of inputting, accessing, and modifying communication recipient identities, state data required to establish and/or enhance a communication session between the communications device and one or more recipients, and expanded information data.
    Type: Grant
    Filed: July 24, 2007
    Date of Patent: June 28, 2011
    Assignee: PicoMobile Networks, Inc.
    Inventors: Paul Aerick Lambert, Lu Chang
  • Patent number: 7961756
    Abstract: A communications processor includes a first upper layer module to execute one or more upper layer protocols and a data link layer module to execute a data link layer protocol. A host processor includes a second upper layer module to execute the one or more upper layer protocols. A switching module causes the communications processor to operate in a first state or a second state. The communications processor executes only the data link layer protocol and none of the one or more upper layer protocols when the communications processor operates in the first state, and executes the data link layer protocol and the one or more upper layer protocols when the communications processor operates in the second state. The power saving module prevents the host processor from executing the one or more upper layer protocols executed by the communications processor when the communications processor operates in the second state.
    Type: Grant
    Filed: July 10, 2007
    Date of Patent: June 14, 2011
    Assignee: PicoMobile Networks, Inc.
    Inventors: Paul Aerick Lambert, Lu Chang, Ranjeet Shetye
  • Patent number: 7889686
    Abstract: The present invention is a system of reception or transmission of media data, such as for audio or video streams, so that data communications alternate transmission or reception routes between available communications networks, choosing among parallel or single communications paths a most efficient and/or most reliable path for transmission of media packets.
    Type: Grant
    Filed: June 18, 2007
    Date of Patent: February 15, 2011
    Assignee: Picomobile Networks, Inc.
    Inventors: Lu Chang, Paul Aerick Lambert
  • Patent number: 7266780
    Abstract: A structure and method for entering data into an electronic device (110). A deterministic data input element (130) coupled to the electronic device (110) is operable to accept a user-selected data input. Modulation of a motion of a non-deterministic data input element (140) coupled to the electronic device (11) is operable to select a varying precision of data input choices. A feedback element (120) coupled to one or more of the deterministic data input element (130) and the non-deterministic data input element (140) presents the data input choices to the user. The user enters data into electronic device (110) using one of the deterministic input element (130) and the non-deterministic input element (140) and the feedback element (120) displays a sequence of data choices to the user. The user then navigates a tree of possible data completions in order to select a particular data completion to be entered into the electronic device (110).
    Type: Grant
    Filed: June 30, 2003
    Date of Patent: September 4, 2007
    Assignee: Motorola, Inc.
    Inventors: Carlos McEvilly, Sreeram Balakrishnan, Lu Chang, Jin Guo, Sadik Kapadia, Rudolf Schusteritsch, Charles Yimin Wu
  • Publication number: 20060221935
    Abstract: A method and apparatus for visually representing characteristics of communication processed by a communication device (100) having at least one sensor (104) and a display device (122) are disclosed. When a call is engaged (402), the communication is monitored (404) by the sensor to generate a sensor signal (610). The sensor signal is correlated with an expression code (416) and stored (614) the memory (124) of the communication device (100). A visual representation (502) of an expression code is displayed (428) on the display device (122).
    Type: Application
    Filed: March 31, 2005
    Publication date: October 5, 2006
    Inventors: Daniel Wong, Lu Chang