中文摘要：

双正交变换为基于块的低复杂度变换,而且与传统的离散余弦变换相比,一定程度上减小了变换后图像的块效应,因而被采纳入联合图像专家组织JPEG（Joint Photographic Expert Group）最新制定的静态图像编码标准JPEG XR中。为了能够改善其无法实现码流长度控制的缺陷,文章深入研究了JPEG XR的编码技术,提出了一种针对固定压缩比的编码算法。主要思路是通过对双正交变换后的系数进行嵌入式位平面编码,取代了原先的量化步骤,使得压缩码流长度可以精确控制。

英文摘要：

Low-complexity block-based Lapped Biorthogonal Transform which can effectively reduce blocking effect is applied in Joint Photographic Expert Group＇s newest standard for static image coding,whose most admirable advantage is the convenience of being implemented in hardware and its low complexity in both memory-occupying and time-consuming.To avoid its weakness in the disability of compression rate control,a resolution was given,after deeply researching into this new algorithm,the Bit Plate Encoding was used to substitute the original quantization process to achieve accurate rate-controlling.