Fast SHVC intra prediction mode decision implementation

Abstract

The Scalable extension of the High Efficiency Video Coding standard (SHVC) combines the large compression efficiency and high visual quality of HEVC with the possibility of encoding several different versions of the same encoded video in a single bitstream. However, this comes at the cost of a high computational complexity. In order to reduce the SHVC encoding time, an intra-prediction mode decision algorithm is proposed. The approach is based on a statistical study on different type video sequences to promote most used intra prediction modes. For each block size, the proposed algorithm defines possible coding modes in the rate-distortion process. The proposed algorithm was validated on two different architectures: first on a mono-core processor and then on a multi-core DSP. The restriction of the intra prediction mode allowed an important reduction of processing time by 78.25% leading to a reduction in the total encoding time by 15.898% on average. About the video quality, a merely 0.043 dB PSNR loss resulting with a 3.404% bit rate increase.