Patents by Inventor Wai Shing Yiu

Wai Shing Yiu 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).

  • Systems and methods for triggering an out of focus alert
    Patent number: 8902366
    Abstract: In order to trigger an out of focus alert when the focus level of a video frame meets a focus criteria, a method is performed including the operations of: receiving a video frame, partitioning the video frame into a plurality of blocks, calculating an array of discrete cosign transformation (DCT) coefficients for at least one of the plurality of blocks using a DCT, classifying each of the at least one of the plurality of blocks based on the array of DCT coefficients for that block, calculating a focus level of the video frame from the block classifications, and triggering an out of focus alert if the focus level meets a focus criteria.
    Type: Grant
    Filed: December 31, 2012
    Date of Patent: December 2, 2014
    Assignee: Verint Systems Inc.
    Inventors: Fuk Sang Mak, Hing Yip Chung, Tao Luo, Wai Shing Yiu, Chi Kin Lee, Shiu Hang Tsang
  • Systems and methods for triggering an out of focus alert
    Patent number: 8345162
    Abstract: In order to trigger an out of focus alert when the focus level of a video frame meets a focus criteria, a method is performed including the operations of: receiving a video frame, partitioning the video frame into a plurality of blocks, calculating an array of discrete cosine transformation (DCT) coefficients for at least one of the plurality of blocks using a DCT, classifying each of the at least one of the plurality of blocks based on the array of DCT coefficients for that block, calculating a focus level of the video frame from the block classifications, and triggering an out of focus alert if the focus level meets a focus criteria.
    Type: Grant
    Filed: November 9, 2007
    Date of Patent: January 1, 2013
    Assignee: Verint Systems Inc.
    Inventors: Fuk Sang Mak, Hing Yip Chung, Tao Luo, Wai Shing Yiu, Chi Kin Lee, Shiu Hang Tsang
  • SYSTEMS AND METHODS FOR TRIGGERING AN OUT OF FOCUS ALERT
    Publication number: 20090033796
    Abstract: In order to trigger an out of focus alert when the focus level of a video frame meets a focus criteria, a method is performed including the operations of: receiving a video frame, partitioning the video frame into a plurality of blocks, calculating an array of discrete cosign transformation (DCT) coefficients for at least one of the plurality of blocks using a DCT, classifying each of the at least one of the plurality of blocks based on the array of DCT coefficients for that block, calculating a focus level of the video frame from the block classifications, and triggering an out of focus alert if the focus level meets a focus criteria.
    Type: Application
    Filed: November 9, 2007
    Publication date: February 5, 2009
    Inventors: Fuk Sang Mak, Hing Yip Chung, Tao Luo, Wai Shing Yiu, Chi Kin Lee, Shiu Hang Tsang