标题：Windowed all phase biorthogonal transform and its application in JPEG-Like image compression
作者：Fu, Qiming ;Zhou, Xiao ;Wang, Chengyou ;Jiang, Baochen
作者机构：[Fu, Qiming ;Zhou, Xiao ;Wang, Chengyou ;Jiang, Baochen ] School of Mechanical, Electrical and Information Engineering, Shandong University, Weihai; 2 更多
来源：Journal of Communications
关键词：Discrete cosine transform (DCT); Generalized pattern search algorithm (GPSA); Image compression; JPEG algorithm; Windowed all phase biorthogonal transform (WAPBT); Windowed all phase digital filter (APDF)
摘要：This paper proposes new concepts of the windowed all phase biorthogonal transform (WAPBT), which is inspired by the all phase biorthogonal transform (APBT). In the light of windowed all phase digital filter theory, windowed all phase biorthogonal transforms is proposed. The matrices of WAPBT based on DFT, WHT, DCT and IDCT are deduced, which can be used in image compression instead of the conventional DCT, and the image compression scheme proposed in this paper is called WAPBT-based JPEG (WAPBT-JPEG). With optimal window sequence of WAPBT for image compression obtained by using generalized pattern search algorithm (GPSA), the peak signal to noise ratio (PSNR) and visual quality of the reconstructed images using the WAPBT-JPEG is outgoing DCT-based JPEG (DCT-JPEG) and APBT-based JPEG (APBT-JPEG) approximately at all bit rates. What is more, by comparison with DCT-JPEG, the advantage of proposed scheme is that the quantization table is simplified and the transform coefficients can be quantized uniformly. Therefore, the computing time becomes shorter and the hardware implementation is easier. © 2015 Journal of Communications.