(to be updated soon)
Handling packet loss or delay
in the mobile and/or Internet environment is usually a challenging problem
for multimedia transmission. Using connection-oriented protocol such as
TCP may introduce intolerable time delay in re-transmission. Using datagram-oriented
protocols such as UDP may cause partial representation in case of packet
loss. In this project, we propose a new method of using our self-authentication-and-recovery
images (SARI) to do the error detection and concealment in the UDP environment.
SARI uses a unique watermarking technique for image feature extraction
and embedding. For wireless video, the lost information in a SARI image
can be approximately recovered based on the embedded watermark, which
includes the content-based authentication information and recovery information.
Images or video frames are watermarked in a priori such that no additional
mechanism is needed in the networking or the encoding process. Because
the recovery is not based on adjacent blocks, the proposed method can
recover the corrupted area even though the information loss happen in
large areas or high variant areas. Our experiments show the advantages
of such technique in both transmission time saving and broad application
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Last updated: June 12, 2002.