Patents by Inventor Tim Ka Lung WONG

Tim Ka Lung WONG 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).

  • Halo reduction in frame-rate-conversion using hybrid bi-directional motion vectors for occlusion/disocclusion detection
    Patent number: 9148622
    Abstract: A frame-rate converter reduces halo artifacts along edges of moving objects. Halo artifacts occur on interpolated frames where a moving object covers and uncovers pixels along its edges. Motion estimation among three original frames produces hybrid direction motion vectors that are bi-directional for background and objects, but are unidirectional for covered and uncovered regions, since motion vectors with large matching errors are deleted. Covered regions in the interpolated frame are detected as intersecting only a forward but no backward hybrid motion vector. Bi-directional motion estimation from the hybrid motion vectors of two original frames produces refined motion vectors for the interpolated frame. Refined motion vectors in the covered regions are deleted and replaced with hybrid motion vectors from the original frames. Hybrid motion vectors from the original frames are assigned to the critical covered regions rather than using interpolated vectors in the covered regions, reducing halo artifacts.
    Type: Grant
    Filed: December 29, 2011
    Date of Patent: September 29, 2015
    Assignee: Hong Kong Applied Science and Technology Research Institute Company, Limited
    Inventors: Xuejiao Liu, King Hung Chiu, Peng Luo, Tim Ka Lung Wong
  • Halo Reduction in Frame-Rate-Conversion Using Hybrid Bi-Directional Motion Vectors for Occlusion/Disocclusion Detection
    Publication number: 20130170551
    Abstract: A frame-rate converter reduces halo artifacts along edges of moving objects. Halo artifacts occur on interpolated frames where a moving object covers and uncovers pixels along its edges. Motion estimation among three original frames produces hybrid direction motion vectors that are bi-directional for background and objects, but are unidirectional for covered and uncovered regions, since motion vectors with large matching errors are deleted. Covered regions in the interpolated frame are detected as intersecting only a forward but no backward hybrid motion vector. Bi-directional motion estimation from the hybrid motion vectors of two original frames produces refined motion vectors for the interpolated frame. Refined motion vectors in the covered regions are deleted and replaced with hybrid motion vectors from the original frames. Hybrid motion vectors from the original frames are assigned to the critical covered regions rather than using interpolated vectors in the covered regions, reducing halo artifacts.
    Type: Application
    Filed: December 29, 2011
    Publication date: July 4, 2013
    Applicant: Hong Kong Applied Science & Technology Research Institute Company Limited
    Inventors: Xuejiao LIU, King Hung CHIU, Peng LUO, Tim Ka Lung WONG