The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 16, 2001
Filed:
Jan. 08, 1999
Ravi Krishnamurthy, Plainsboro, NJ (US);
Sriram Sethuraman, Hightstown, NJ (US);
Other;
Abstract
Frames in a video sequence are divided into two or more regions and a specified number of macroblocks are selected in each region for intra-coding. Depending on the particular implementation, for one or more of the regions, the intra-macroblocks are selected randomly, while at least one other region is dividing into a specified number of slices with the least-recently intra-coded macroblock in each slice selected for intra-coding. When an error is detected at the decoder, the decoder discards data in the corresponding packet and applies a concealment strategy that involves using motion-compensated data if the motion vectors were accurately decoded; otherwise, using non-motion-compensated reference data for the macroblocks affected by the discarding of data. The refresh strategy of the present invention can be used to provide the resulting encoded bitstream with resilience to transmission errors, while maintaining an acceptable degree of video compression.