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Automatika : journal for control, measurement, electronics, computing and communications, Vol. 57 No. 4, 2016.

Original scientific paper

https://doi.org/10.7305/automatika.2017.12.1600

Improved Adaptive Transform for Residue in H.264/AVC Lossless Video Coding

Xianfeng Ou ; College of Information & Communication Engineering, Hunan Institute of Science & Technology, Xueyuan Road, Yueyang, Hunan, China
Long Yang ; Shenzhen Intellifusion Technologies Co., Ltd Shangbu road NO.1003, Futian district, Shenzhen, China
Guoyun Zhang ; College of Information & Communication Engineering, Hunan Institute of Science & Technology, Xueyuan Road, Yueyang, Hunan, China
Longyuan Guo ; College of Information & Communication Engineering, Hunan Institute of Science & Technology, Xueyuan Road, Yueyang, Hunan, China
Jianhui Wu ; College of Information & Communication Engineering, Hunan Institute of Science & Technology, Xueyuan Road, Yueyang, Hunan, China
Bing Tu ; College of Information & Communication Engineering, Hunan Institute of Science & Technology, Xueyuan Road, Yueyang, Hunan, China

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Abstract

The H.264/AVC was designed mainly for lossy video coding, the lossless coding of H.264 use bypass mode for DCT and quantization. Although sample-by-sample DPCM improves performance of coding, the benefit is limited in intra. In this paper, a new adaptive transform is proposed based on the character of 4x block residual coefficient's distribution, which can be used both in intra and inter coding. The greatest strength of the proposed transform is the decorrelation without inflation versus dynamic range of input matrix. Due to the random distribution of residual coefficients, a specific transform is hard to play a positive impact on them. Therefore, several transforms of different directions will be implemented simultaneously, and the most efficient one will be determined by a proposed mechanism. Then, by means of statistic method, a new scan order is designed for CAVLC entropy encoder, cooperating with corresponding transform. The simulation results show that based on the fast algorithm of proposed method, the bit saving achieves about 7.41% bit saving in intra coding and 10.47% in inter, compared with H.264-LS.

Keywords

H.264/AVC; lossless video coding; adaptive transform; residual coefficient’s distribution

Hrčak ID:

196271

URI

https://hrcak.srce.hr/196271

Publication date:

19.1.2018.

Article data in other languages: croatian

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