Patents by Inventor Antonio Miguel Marques Rodrigues Teixeira Lourenco

Antonio Miguel Marques Rodrigues Teixeira Lourenco 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 for aligning and tracking point regions in images with radial distortion that outputs motion model parameters, distortion calibration, and variation in zoom
    Patent number: 9367928
    Abstract: The present invention relates to a method for matching point regions in images with radial distortion that, given two frames acquired by a camera with radial distortion, estimates the global image distortion and the local transformations undergone by the image regions between frames, with the objective of accurately tracking an aligning these image regions in a sequence of frames, calibrating the radial distortion using only moving image points, or estimating the relative change in focal length in cameras with radial distortion and variable zoom using only moving image points, and that comprises the following steps: extracting local image features; tracking local features; and determining the radial distortion calibration based on a computational efficient procedure that uses the information for all local features being tracked.
    Type: Grant
    Filed: October 7, 2013
    Date of Patent: June 14, 2016
    Assignee: Universidade de Coimbra
    Inventors: Joao Pedro de Almeida Barreto, Antonio Miguel Marques Rodrigues Teixeira Lourenco, Rui Jorge Melo Teixeira
  • Method for Aligning and Tracking Point Regions in Images with Radial Distortion that Outputs Motion Model Parameters, Distortion Calibration, and Variation in Zoom
    Publication number: 20150254872
    Abstract: The present invention relates to a method for matching point regions in images with radial distortion that, given two frames acquired by a camera with radial distortion, estimates the global image distortion and the local transformations undergone by the image regions between frames, with the objective of accurately tracking an aligning these image regions in a sequence of frames, calibrating the radial distortion using only moving image points, or estimating the relative change in focal length in cameras with radial distortion and variable zoom using only moving image points, and that comprises the following steps: extracting local image features; tracking local features; and determining the radial distortion calibration based on a computational efficient procedure that uses the information for all local features being tracked.
    Type: Application
    Filed: October 7, 2013
    Publication date: September 10, 2015
    Inventors: Joao Pedro de Almeida Barreto, Antonio Miguel Marques Rodrigues Teixeira Lourenco, Rui Jorge Melo Teixeira