Reduction of intra-coding time for HEVC based on temporary direction map

Reduction of intra-coding time for HEVC based on temporary direction map

The high-efficiency video coding (HEVC) standard uses 35 intra-prediction modes for 2 N  × 2 N ( N is an integer number ranging from six to two) luma blocks and five modes for chroma blocks. To find the luma block with the minimum rate–distortion, it must perform 11935 different rate–distortion cost...

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Bibliographic Details
Published in:Journal of real-time image processing 2020-06, Vol.17 (3), p.567-579
Main Authors: Heidari, Behnam, Ramezanpour, Mohammadreza
Format: Article
Language:eng
Subjects:
Algorithms
Coding
Coding standards
Complexity
Computer Graphics
Computer Science
Computer simulation
Distortion
Image Processing and Computer Vision
Multimedia Information Systems
Original Research Paper
Pattern Recognition
Performance enhancement
Signal,Image and Speech Processing
Simulation
Video compression
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Summary:The high-efficiency video coding (HEVC) standard uses 35 intra-prediction modes for 2 N  × 2 N ( N is an integer number ranging from six to two) luma blocks and five modes for chroma blocks. To find the luma block with the minimum rate–distortion, it must perform 11935 different rate–distortion cost calculations. Although this approach improves coding efficiency compared to the previous standards such as H.264/AVC, computational complexity is increased significantly. In this paper, an intra-prediction technique has been described to improve the performance of the HEVC standard by minimizing its computational complexity. The proposed algorithm consists of two stages. The first stage, called prediction unit size decision (PUSD) was introduced to decrease evaluation of prediction unit sizes by ~ 38%. The second stage called prediction mode fast decision (PMFD) was developed to minimize the number of modes in the rough mode decision (RMD) stage. The simulation results show that the time complexity is decreased by ~ 47%, while the BD rate is increased by 1.08%, and PSNR is decreased by 0.04 db. Accordingly, the proposed algorithms have a negligible effect on the video quality with great saving in the time complexity.
ISSN:1861-8200
1861-8219