3D Visual Communications

8.2 Error Resilience

In this section we will be discussing error resilience techniques. As we shall see over the rest of this chapter, it is sometimes difficult to make a clear demarcation as to whether a particular technique is an error resilience technique or rather belongs to one of the other types of techniques to be discussed in later sections. For the purpose of keeping an ordered presentation, we will consider error resilience those that introduce certain structure and techniques within the transmitted 3D video bit stream that reduces or limits the negative effects of channel errors on the recovered video.

One approach to provide larger error resilience to an encoded 3D video bit stream is to modify the compression procedure or the resulting compressed bit stream to aid in the recovery from errors or to provide a level of embedded redundancy in the encoding of information. This approach is contrary to the goals for signal compression, which aims at eliminating as much redundancy as possible from the source. Consequently, it is expected that the changes associated with added error resilience would result in the source encoder having less compression efficiency. This may not necessarily be a bad outcome since the measure of quality for 3D video has to be of an end-to-end nature, meaning with this that it has to include both distortion due to compression and distortion introduced in the communication channel. A good error resilience technique should trade a moderate or small ...