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Conventional scalable video coders are typically based on single-quality video coding techniques. However, additional issues arise when designing a scalable system. For example, the design of a single-quality system is typically motivated by the desire to minimize the perceived distortion. However, in a recursive scalable system, the coded video is not only viewed, but is also used to form a prediction for the higher levels of video. Therefore, the coding artifacts introduced in the lower levels propagate to the higher levels, reducing the coding efficiency of the entire system. |
