一种基于块位长的小波嵌入零块编码算法(结合工程)

提出一种基于块位长的小波嵌入零块编码算法，该算法通过以下几项措施来减少编码过程的内存占用，同时提高编码的工作效率：（1）LLn子带单独编码；（2）提出位长定义，建立块位长位图；（3）通过位长位图代替排序、细化链表，节省内存占用；（4）通过位长位图的树结构来快速搜索重要块，克服重复扫描，加快编码速度。软件测试及硬件实现结果表明，该算法在保持高信噪比的同时，有效地减少了编码过程的内存占用，提高了编码速度。

A Wavelet Embedded Block Coding Method Based on Block Bit-length

A wavelet embedded block coding method based on block bit-length is brought forward in this article. The memory occupancy can be reduced through four measures which adopted in the arithmetic in the process of coding and coding efficiency can be increasingly improved, respectively. The four measures mentioned above are: (1)LLn sub-band separate coding; (2)establish block bit-length chart in terms of bit-length, the bit-length is defined by the author; (3)save the space of memory by employing bit-length chart instead of using lists in the process of delicating and ranking; (4)swift search key blocks according to the construction of bit-length chart to overcome repeat scan and increase the coding speed. According to the experimental results, the arithmetic can reduce memory occupancy in the process of coding and increase the coding speed effectively, meanwhile, it can keep the high quality of PSNR.