Patents by Inventor Tzu-Shan Chang

Tzu-Shan 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).

  • Image processing method applicable to images captured by wide-angle zoomable lens
    Patent number: 9218650
    Abstract: An image processing method applicable to images captured by a wide-angle zoomable lens is provided. Said method comprising steps of: A. utilizing the wide-angle zoomable lens to photograph a calibration pattern under a predetermined focal length to obtain a distorted image corresponding to the calibration pattern; B. calculating a distortion parameter for the wide-angle zoomable lens at the predetermined focal length; C. utilizing the wide-angle zoomable lens to photograph an object under another focal length to obtain another distorted image corresponding thereto; D. calculating a new distortion parameter by using the distortion parameter obtained from Step B and a multiple relation between said another focal length and the predetermined focal length; and E. using the new distortion parameter to perform distortion correction on said anther distorted image corresponding to the object. The present invention can perform distortion correction for real-time images captured by the wide-angle zoomable lens.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: December 22, 2015
    Assignee: NATIONAL TSING HUA UNIVERSITY
    Inventors: Shang-Hong Lai, Tung-Ying Lee, Tzu-Shan Chang
  • IMAGE PROCESSING METHOD APPLICABLE TO IMAGES CAPTURED BY WIDE-ANGLE ZOOMABLE LENS
    Publication number: 20140307128
    Abstract: An image processing method applicable to images captured by a wide-angle zoomable lens is provided. Said method comprising steps of: A. utilizing the wide-angle zoomable lens to photograph a calibration pattern under a predetermined focal length to obtain a distorted image corresponding to the calibration pattern; B. calculating a distortion parameter for the wide-angle zoomable lens at the predetermined focal length; C. utilizing the wide-angle zoomable lens to photograph an object under another focal length to obtain another distorted image corresponding thereto; D. calculating a new distortion parameter by using the distortion parameter obtained from Step B and a multiple relation between said another focal length and the predetermined focal length; and E. using the new distortion parameter to perform distortion correction on said anther distorted image corresponding to the object. The present invention can perform distortion correction for real-time images captured by the wide-angle zoomable lens.
    Type: Application
    Filed: June 11, 2013
    Publication date: October 16, 2014
    Inventors: Shang-Hong LAI, Tung-Ying Lee, Tzu-Shan Chang