Patents by Inventor Ajay Divakaran

Ajay Divakaran 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).

  • Methods of scene change detection and fade detection for indexing of video sequences
    Patent number: 6449392
    Abstract: This invention relates to methods of abrupt scene change detection and fade detection for indexing of MPEG-2 and MPEG-4 compressed video sequences. Abrupt scene change and fade-detection techniques applied to signals in compressed form have reasonable accuracy and the advantage of high simplicity since they are based on entropy decoding and do not require computationally expensive inverse Discrete Cosine Transformation (DCT).
    Type: Grant
    Filed: January 14, 1999
    Date of Patent: September 10, 2002
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Ajay Divakaran, Huifang Sun, Hiroshi Ito, Tommy C. Poon
  • Method and system for high-level structure analysis and event detection in domain specific videos
    Publication number: 20020018594
    Abstract: A system and method analyzes a compressed video including a sequence of frames. The amount of a dominant feature in each frame of the compressed video is measured. A label is associated with each frame according the measured amount of the dominant feature. Views in the video are identified according to the labels, and the video is segmented into actions according to the views. The video can then be analyzed according to the action to determine significant events in the video.
    Type: Application
    Filed: April 20, 2001
    Publication date: February 14, 2002
    Applicant: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Peng Xu, Shih-Fu Chang, Ajay Divakaran
  • Methods of scene fade detection for indexing of video sequences
    Patent number: 6327390
    Abstract: A method locates scene changes in a sequence of images or frames that have been compressed without first decompressing the sequence. The sequence includes subsequences of P-frames between I-frames. DC residual coefficients including sign information are extracted from the sub-sequences of P-frames. If the number of residual coefficients in the P-frames exceed a predetermined threshold, then a scene change is indicated. Positive coefficients indicate fade-ins, and negative coefficients indicate fade-outs.
    Type: Grant
    Filed: January 14, 1999
    Date of Patent: December 4, 2001
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Huifang Sun, Ajay Divakaran, Hiroshi Ito, Tommy C. Poon