Lifting-based directional DCT-like transform for image coding

被引：0

作者：

Xu, Hao ^{[1
]}

Xu, Jizheng ^{[2
]}

Wu, Feng ^{[2
]}

机构：

[1] Univ Sci & Technol China, Dept Elect Engn & Informat Sci, Hefei 230026, Peoples R China

[2] Microsoft Res Asia, Internet Media Grp, Beijing, Peoples R China

来源：

2007 IEEE INTERNATIONAL CONFERENCE ON IMAGE PROCESSING, VOLS 1-7 | 2007年

关键词：

directional transform; DCT;

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Traditional 2D DCT implemented by separable 1D transform in horizontal and vertical directions does not take image orientation features in a local window into account. To improve it, we propose to introduce directional primary operations to the lifting-based DCT and thereby derive a new directional DCT-like transform. A JPEG-wise image coding scheme is also proposed to evaluate the performance of the proposed directional DCT-like transform. In this scheme, each 8x8 block can be transformed along different direction in order to better adapt to local orientation properties of image. The experimental results show that the performance of the proposed directional DCT can dramatically outperform the conventional DCT up to 2dB even without modifying entropy coding.

引用

页码：1313 / +

页数：2