Zahra Mirian - Islamic Azad University Mobarakeh BranchDepartment of Computer Engineering, Mobarakeh Branch, Islamic Azad University, Isfahan, Iran
Mohammadreza Ramezanpour - Islamic Azad University Mobarakeh BrDepartment of Computer Engineering, Mobarakeh Branch, Islamic Azad University, Isfahan, Irananch

High Efficiency Video Coding (HEVC) is considered the last standard for video compression with about ۵۰% additional compression compared to the previous standard i.e. H۲۶۴/AVC, while maintaining image quality. The significant increase in performance of this standard has been achieved with high computational complexity. In this standard, the intra prediction unit is one of the parts that although it greatly improves performance, it significantly increases its computational complexity due to the increase in the number of prediction modes. In this paper, a method has been proposed to reduce the number of intra prediction modes in HEVC by which the computational complexity of compression at this stage can be reduced as much as possible. The proposed method determines the predominant mode of ۴ × ۴ blocks, and the details in each larger block, and accordingly, by applying the appropriate filters and selecting the most likely mode, the number of candidate modes to select the best mode is reduced. The simulation results showed that on average the proposed method can reduce the compression time by ۴۵% while increasing the bit rate by ۰.۶۹%.

HEVC, Intra prediction, Computational complexity, prediction block