Abstract
Compressed video is very sensitive to channel errors. A few bit losses can stop the entire decoding process. Therefore, protecting compressed video is always necessary for reliable visual communications. Utilizing unequal error protection schemes that assign different protection levels to the different elements in a compressed video stream is an efficient and effective way to combat channel errors. Three such schemes, based on Wyner-Ziv coding, are described herein. These schemes independently provide different protection levels to motion information and the transform coefficients produced by an H.264/AVC encoder. One method adapts the protection levels to the content of each frame, while another utilizes feedback regarding the latest channel packet loss rate to adjust the protection levels. All three methods demonstrate superior error resilience to using equal error protection in the face of packet losses.
Highlights
Channel errors can result in serious loss of decoded video quality
We improve the performance of our unequal error protection technique by adapting the parity data rates for protecting the video information to the content of each frame
Unequal error protection using Pseudo Wyner-Zive coding (UEPWZ), motion information and the transform coefficients are provided fixed albeit different protection levels for the entire video sequence
Summary
Channel errors can result in serious loss of decoded video quality. Error resilience approaches employing Wyner-Ziv lossy coding theory [2] have been developed and have resulted in improvement in the visual quality of the decoded frames [3,4,5,6,7,8,9,10,11,12,13]. Other works applied distributed source coding onto error resilience include [14,15,16,17]. In 1976, Wyner and Ziv proved that when the side information is only known to the decoder, the minimum required source coding rate will be greater or equal to the rate when the side information is available at both encoder and decoder (see Figure 1). It was shown that RWZ(D) ≥ RX|Y (D) [2], where RWZ(D) is the data rate used when the side information is only available to the decoder and RX|Y (D) represents the data rate required when the side information is available at both the encoder and the decoder
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