Decoder-side intra mode derivation for block-based video coding
Xiaoyu Xiu, Yuwen He, Yan Ye · 2016
This paper proposes a decoder-side intra mode derivation algorithm for block-based video coding. Instead of explicitly coding intra mode, the algorithm derives intra mode at both encoder and decoder using a template-based method. Based on rate-distortion optimization, the encoder locally determines whether intra mode derivation or intra mode explicit coding is used. Further, as no intra mode is coded, the proposed algorithm is able to more accurately capture the direction of edges in natural videos by increasing the granularity of directional intra predictions with no signaling overhead increase. To verify the effectiveness, the proposed algorithm is implemented on the Joint Exploration Model 2.0 platform. Experimental results show that an average Bjentegaard delta rate saving of 0.9% is achieved by the proposed algorithm.