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For mobile video codecs, the huge energy dissipation for external memorytraffic is a critical challenge under the battery power constraint. Lossyembedded compression (EC), as a solution to this challenge, is considered inthis paper. While previous studies in EC mostly focused on compressionalgorithms at the block level, this work, to the best of our knowledge, is thefirst one that addresses the allocation of video quality and memory traffic atthe frame level. For lossy EC, a main difficulty of its application lies in theerror propagation from quality degradation of reference frames. Instinctively,it is preferred to perform more lossy EC in non-reference frames to minimizethe quality loss. The analysis and experiments in this paper, however, willshow lossy EC should actually be distributed to more frames. Correspondingly,for hierarchical-B GOPs, we developed an efficient allocation that outperformsthe non-reference-only allocation by up to 4.5 dB in PSNR. In comparison, theproposed allocation also delivers more consistent quality between frames byhaving lower PSNR fluctuation.

Frame-level quality and memory traffic allocation for lossy embedded compression in video codec systems