基于下采样和全相位DCT内插的WDCT-JPEG块编码  

Block coding of WDCT-JPEG based on down-sampling and all phase DCT

作　　者：庞茜[1] 侯正信[1] 杨爱萍[1] 薄双双[1] 

机构地区：[1]天津大学电子信息工程学院,天津300072

出　　处：《计算机工程与应用》2012年第4期155-157,共3页Computer Engineering and Applications

基　　金：国家自然科学基金(No.61002027)

摘　　要：卷曲离散余弦变换(WDCT)通过频率卷曲使变换后的信号能量分布更适合于图像压缩编码。为了提高低比特率图像压缩编码性能,在WDCT中引入基于下采样和全相位延拓DCT内插编码框架。实验结果表明,不论是峰值信噪比还是主观效果,提出的基于下采样和全相位DCT内插的WDCT-JPEG算法在低比特率下编码性能显著提高,方块效应明显减少。With the frequency warping, the Warped Discrete Cosine Transform（WDCT） makes the signal energy distribution more suit- able for image coding. In order to improve the coding performance in the low bit-rate, this paper presents a code frame based on down sampling and All Phase DCT （APDCT） interposition. Experimental results show that, no matter for PSNR or subjective result, the proposed method obviously improves the performance of image coding in low bit-rate, and reduces the block effects significantly.

关 键 词：卷曲离散余弦变换 低比特率 下采样 全相位DCT内插 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]