Low complexity Bi-Partition mode selection for 3D video depth intra coding

•We can skip most of Bi-Partition mode full RD-cost value calculation.•We use the Smallest Rough RD Cost Value (SRCV) to speedup the encoder.•More than 34% encoding time saving is achieved under all-intra configuration.•Small encoding time saving is also achieved under random access configuration.•Flexibility is provided to tradeoff between encoding time saving and BD-rate loss.