Patents by Inventor Rajesh Chandrasekhar

Rajesh Chandrasekhar 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: 10375582
    Abstract: A mobile device transmits data over a shared spectrum in an uplink channel to a base station in a contention-based access scheme. The mobile device obtains data to be wirelessly transmitted over the shared spectrum in the uplink channel to the base station. The uplink channel is formatted with a frame/subframe structure with a predetermined timing. The mobile device determines whether the shared spectrum is free for transmission according to a listen before transmit procedure. When the shared spectrum is free for transmission, the mobile device contends with other mobile device to gain access to the uplink channel. After gaining access to the uplink channel, the mobile device transmits the data over the shared spectrum in the uplink channel to the base station.
    Type: Grant
    Filed: May 29, 2018
    Date of Patent: August 6, 2019
    Assignee: Cisco Technology, Inc.
    Inventors: Vikram Chandrasekhar, Kedar Shirali, Qing Zhao, Rajesh Pazhyannur
  • Patent number: 6525772
    Abstract: A display system that can be calibrated and re-calibrated with a minimal amount of manual intervention. To accomplish this, one or more cameras are provided to capture an image of the display screen. The resulting captured image is processed to identify any non-desirable characteristics, including visible artifacts such as seams, bands, rings, etc. Once the non-desirable characteristics are identified, an appropriate transformation function is determined. The transformation function is used to pre-warp the input video signal that is provided to the display such that the non-desirable characteristics are reduced or eliminated from the display. The transformation function preferably compensates for spatial non-uniformity, color non-uniformity, luminance non-uniformity, and other visible artifacts.
    Type: Grant
    Filed: June 8, 2001
    Date of Patent: February 25, 2003
    Assignee: Honeywell Inc.
    Inventors: Michael J. Johnson, Chung-Jen Chen, Rajesh Chandrasekhar
  • Publication number: 20020027608
    Abstract: A display system that can be calibrated and re-calibrated with a minimal amount of manual intervention. To accomplish this, one or more cameras are provided to capture an image of the display screen. The resulting captured image is processed to identify any non-desirable characteristics, including visible artifacts such as seams, bands, rings, etc. Once the non-desirable characteristics are identified, an appropriate transformation function is determined. The transformation function is used to pre-warp the input video signal that is provided to the display such that the non-desirable characteristics are reduced or eliminated from the display. The transformation function preferably compensates for spatial non-uniformity, color non-uniformity, luminance non-uniformity, and other visible artifacts.
    Type: Application
    Filed: June 8, 2001
    Publication date: March 7, 2002
    Applicant: Honeywell, Inc.
    Inventors: Michael J. Johnson, Chung-Jen Chen, Rajesh Chandrasekhar
  • Patent number: 6310650
    Abstract: A display system that can be calibrated and re-calibrated with a minimal amount of manual intervention. To accomplish this, one or more cameras are provided to capture an image of the display screen. The resulting captured image is processed to identify any non-desirable characteristics, including visible artifacts such as seams, bands, rings, etc. Once the non-desirable characteristics are identified, an appropriate transformation function is determined. The transformation function is used to pre-warp the input video signal that is provided to the display such that the non-desirable characteristics are reduced or eliminated from the display. The transformation function preferably compensates for spatial non-uniformity, color non-uniformity, luminance non-uniformity, and other visible artifacts.
    Type: Grant
    Filed: September 23, 1998
    Date of Patent: October 30, 2001
    Assignee: Honeywell International Inc.
    Inventors: Michael J. Johnson, Chung-Jen Chen, Rajesh Chandrasekhar
  • Patent number: 6219099
    Abstract: The present invention overcomes many of the disadvantages of the prior art by providing a display that can be calibrated and re-calibrated with a minimal amount of manual intervention. To accomplish this, the present invention provides one or more cameras to capture an image that is projected on a display screen. In one embodiment, the one or more cameras are placed on the same side of the screen as the projectors. In another embodiment, an array of cameras is provided on either or both sides of the screen for capturing a number of adjacent and/or overlapping capture images of the screen. In either of these embodiments, the resulting capture images are processed to identify any non-desirable characteristics including any visible artifacts such as seams, bands, rings, etc. Once the non-desirable characteristics are identified, an appropriate transformation function is determined.
    Type: Grant
    Filed: September 23, 1998
    Date of Patent: April 17, 2001
    Assignee: Honeywell International Inc.
    Inventors: Michael J. Johnson, Chung-Jen Chen, Rajesh Chandrasekhar