Abstract
Variable length (VLC) is used in a large variety of lossless compression applications. A specially designed VLC, called universal variable length code (UVLC), is utilized in the latest video standard H.26L under development. In this work we propose a new method under the name alternating coding (ALT coding) and apply it to the UVLC. The ALT coded UVLC yields the same high efficiency as the original UVLC, but ALT also enables immediate decoding, immediate detection and location in a UVLC packet. It improves the resiliency and robustness of the UVLC packet by applying an error speculation. Results show that the ALT coded UVLC packet always outperforms the original UVLC packet in terms of resiliency and robustness. Moreover, the simple pattern of ALT coded UVLC can greatly simplify the UVLC decoder architecture and therefore enables small, fast, and low-power decoder design.
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