So far an efficient coding scheme for ultra high resolution (8K) video under a low bit-rate condition has not yet been
proposed. Within H.264 coding framework, highly efficient coding is realized due to the optimal control for the
macroblock (MB) coding mode decision. However, coding modes available in H.264 coding are not necessarily
appropriate for 8K full resolution coding under the considerably low bit-rate condition, and satisfactory coding
performance cannot be achieved within H.264. In this paper, we propose to define the extended coding mode from the
analytical result of R-D performance by conventional coding modes. From coding experiments, it was confirmed that the
maximum coding gain reached 0.18dB at the target bit-rate assumed in this study.
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