Patents by Inventor Hong-Chang Chang

Hong-Chang 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).

  • Video stabilization method
    Patent number: 7440008
    Abstract: A video stabilization method. First, optical flows between successive frames are calculated. The camera motion is then estimated by fitting the computed optical flow field to a simplified affine motion model with a trimmed least square method. Then, the computed camera motions are smoothed to reduce the motion vibrations by using a regularization method. Finally, all frames of the video are transformed based on the original and smoothed motions to obtain a stabilized video.
    Type: Grant
    Filed: June 15, 2004
    Date of Patent: October 21, 2008
    Assignee: Corel TW Corp.
    Inventors: Shang-Hong Lai, Hong-Chang Chang, Kuang-Rong Lu
  • Video stabilization method
    Publication number: 20050275727
    Abstract: A video stabilization method. First, optical flows between successive frames are calculated. The camera motion is then estimated by fitting the computed optical flow field to a simplified affine motion model with a trimmed least square method. Then, the computed camera motions are smoothed to reduce the motion vibrations by using a regularization method. Finally, all frames of the video are transformed based on the original and smoothed motions to obtain a stabilized video.
    Type: Application
    Filed: June 15, 2004
    Publication date: December 15, 2005
    Inventors: Shang-Hong Lai, Hong-Chang Chang, Kuang-Rong Lu