Error detection using a maximum distance among four block-motion-vectors in a macroblock in a corrupted MPEG-4 bitstream
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 2, 2004
Grant Date -
Sep 19, 2002
app pub date -
Mar 14, 2001
filing date -
Mar 14, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Errors are detected in a motion-picture-experts group (MPEG) bitstream that has been corrupted by wireless transmission. Some 16.times.16 pixel macroblocks are divided into four smaller 8.times.8 blocks. A motion vector is encoded for each block. The Euclid distance is generated for each possible pair of the four motion vectors, and the maximum of these distances is compared to a threshold distance. When the maximum distance among the motion vectors in a macroblock exceeds the threshold, a bitstream error is signaled and error concealment is triggered. Since the four blocks within a macroblock usually stay close to each other in adjacent video frames, large jumps in the relative location of one block usually indicate a bitstream error. Squares of the distances can be generated and compared to reduce the computational load by eliminating square-root operations.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully