  The reference frame memory accesses in inter prediction result in high DRAM
bandwidth requirement and power consumption. This problem is more intensive by
the adoption of intra block copy (IBC), a new coding tool in the screen content
coding (SCC) extension to High Efficiency Video Coding (HEVC). In this paper,
we propose a lossless recompression scheme that compresses the reference blocks
in intra prediction, i.e., intra block copy, before storing them into DRAM to
alleviate this problem. The proposal performs pixel-wise texture analysis with
an edge-based adaptive prediction method yet no signaling for direction in
bitstreams, thus achieves a high gain for compression. Experimental results
demonstrate that the proposed scheme shows a 72% data reduction rate on
average, which solves the memory bandwidth problem.
