A novel adaptive quantization method for video coding

作者：Xiang, Guoqing; Jia, Huizhu^*; Yang, Mingyuan; Li, Yuan; Xie, Xiaodong

来源：Multimedia Tools and Applications, 2018, 77(12): 14817-14840.

DOI：10.1007/s11042-017-5064-4

• Inter-frame dependency
• Adaptive quantization
• QP offset
• SSIM
• Subjective quality

In this paper, we propose a novel AQ (Adaptive Quantization) algorithm to improve the subjective coding performance. Firstly, the factors affecting a suitable adaptive quantization method are carefully analyzed. Two important conclusions are drawn to guide designing a suitable AQ method. Secondly, based on the drawn analysis, a novel SATD (Sum of the Transformed Difference) based temporal adaptive quantization method is proposed. The proposed method fully considers the temporal characteristics, which can produce more visual-friendly QP (quantization parameter) offset distribution. Experiments are performed on x264 and HM16.0, respectively. With SSIM (Structure Similarity) as the metric, more than 21.07% BD-Rate (Bjontegaard-Delta Rate) saving can be achieved on x264, and on HM16.0, 8.07% and 7.99% BD-Rate savings can be obtained for LDP (Low-Delay-main-P) and LDB (Low-Delay-main-B) configurations, respectively, which is better than the state-of-the-art methods.

• 出版日期2018-6
• 单位北京大学