Color Image Compression Based on Directional All Phase Biorthogonal Transform
Chunxiao Zhang, Chengyou Wang, Baochen Jiang · International Journal of Multimedia and Ubiquitous Engineering · 2015
There are images in which some directional edges other than the vertical or horizontal ones dominate.So the conventional discrete cosine transform (DCT) may not be the best choice for them.Directional DCT framework is able to provide a better coding performance for image blocks that contain directional edges.In addition, the all phase biorthogonal transform (APBT) algorithm can improve the performance of compression.In the light of directional DCT and APBT, directional APBT is proposed and applied to color image coding.Experimental results show that this framework can indeed improve the compression performance of color image remarkably.