Patents by Inventor Sreejith Markkassery

Sreejith Markkassery 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).

  • Method and apparatus for calibrating the extrinsic parameter of an image sensor
    Patent number: 11393126
    Abstract: A method for calibrating one or more extrinsic parameters of an image sensor includes selecting a first set of parallel feature edges appearing in an image frame captured by the image sensor and determining reference vanishing points for the first set of parallel feature edges. Selecting a second set of parallel feature edges and projecting a plurality of points from the second set parallel feature edges onto the projection reference frame of the image sensor. The method determines the second set of parallel feature edges, second vanishing points located on the projection reference frame and reduces any deviation in location of the second vanishing points from the reference vanishing points until the deviation is within acceptable predefined limits by recursively: modifying the pre-existing projection matrix, projecting a plurality of points from the second set parallel feature edges onto the projection reference frame and determining the second vanishing points after projecting.
    Type: Grant
    Filed: December 17, 2019
    Date of Patent: July 19, 2022
    Assignee: CONTINENTAL AUTOMOTIVE GMBH
    Inventor: Sreejith Markkassery
  • METHOD AND APPARATUS FOR CALIBRATING THE EXTRINSIC PARAMETER OF AN IMAGE SENSOR
    Publication number: 20200193641
    Abstract: A method for calibrating one or more extrinsic parameters of an image sensor includes selecting a first set of parallel feature edges appearing in an image frame captured by the image sensor and determining reference vanishing points for the first set of parallel feature edges. Selecting a second set of parallel feature edges and projecting a plurality of points from the second set parallel feature edges onto the projection reference frame of the image sensor. The method determines the second set of parallel feature edges, second vanishing points located on the projection reference frame and reduces any deviation in location of the second vanishing points from the reference vanishing points until the deviation is within acceptable predefined limits by recursively: modifying the pre-existing projection matrix, projecting a plurality of points from the second set parallel feature edges onto the projection reference frame and determining the second vanishing points after projecting.
    Type: Application
    Filed: December 17, 2019
    Publication date: June 18, 2020
    Inventor: Sreejith Markkassery