Adaptive Accordion Transformation based video compression method on HEVC

• Main Author: 紀宏勳
• Other Authors: 蔡文錦
• Format: Others
• Language: en_US
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/78850759570996940425

碩士 === 國立交通大學 === 資訊科學與工程研究所 === 104 === Fast processing speed and high compression ratio are always expected for video coding, especially for dealing with the increase of video resolutions and the demand of high quality. However, it is hard to compromise between each other since high compression ratio usually requires high coding complexities. Ouni et al. proposed a novel method called accordion-based (ACC) coding in which multiple video frames are combined into an accordion-like representation for compression and it can achieve high compression ratio with low coding complexity. Its coding efficiency is close to H.264/AVC for low-motion video at high bit-rates. However, it may no longer have benefit when applying the ACC to HEVC because HEVC has much better coding efficiency than H.264/AVC. Besides, it is not likely that all the frames in a video sequence are low-motion and thus suitable for ACC coding. To cope with these problems, in this thesis we propose an adaptive method which dynamically switches between accordion-based coding and traditional HEVC coding according to the characteristics of video frames. The experiment result shows that the proposed method can achieve up to 21.1% of total bit-rate saving and 58.6% of encoding time saving, compared to HEVC.