Then discusses conventional encoding and efficient encoding using special sparse parity check matrix in encoding algorithm , and expatiates the principle of message passing and spa which has the best performance in decoding algorithm 在编码算法里详细讨论了传统的编码算法以及使用特殊形式奇偶校验矩阵的快速编码算法。在译码算法里介绍了mp算法集的基本原理和译码性能最好的和乘积译码算法。
In chapter 5 , we discuss where to embed the watermark based on the mpeg ' s encoding algorithm , the differences between mpeg system and static image are considered , we also discuss how to mesure the qulity of a kind of watermarking method 在第五章中,首先根据mpeg文件格式及其编解码算法的特点提出了在视频中嵌入水印的位置,比较了它和静态水印技术的异同点。给出了一种衡量mpeg视频水印技术的方法。
Through anatomizing ezw coding algorithm and taking the effects of human being ’ s vision characteristics on quality of reconstituting image . a improved zeretrees algorithm are put forward . at last a new image compression encoding algorithm based on wavelet transform and vector quantization is put forward . the experiment show , in very low bit rate , using the proposed algorithm , the reconstructed image is superior to that of ezw in both of perception and psnr 最后,在小波树的基础上,通过对矢量量化的研究,本文提出了一种基于四叉树结构新的小波树矢量量化压缩编码算法,实验证明,在较高压缩比的情况下,使用此方法得到的重构图象质量(视觉效果和峰值信噪比)比通常的小波压缩算法有了较大的提高。
The focus is placed on the investigation of the standard of the encoding algorithm for mpeg audio layer iii , and the analysis of the major four modules in the compression algorithm , including encoding of subband filter bank , psychoacoustics model , quantification and huffman coding , frame packing 重点研究了mpeg音频第层编码的算法标准。详细分析了压缩算法中的四个主要功能模块:子带滤波器组编码,心理声学模型,比特流量化与霍夫曼编码,帧数据流格式化。
With this method , the compressed bit - streams , which are encoded by dct - based encoding algorithm , can be processed directly to locate the character - regions in the images , just a very small amount of decoding is required so , the amount of data which want to process is smaller , the processing speed is faster and the demand of computer memory is less 文献中将此模型用在以dct为编码基础压缩数据上,效果较好。本文将其算法中的能量定义利用块间的信息重新定义,并且采用自适应动态阈值对原算法进行改进。对比实验结果表明,改进的方法对图像字符定位比原方法准确率更高,漏检情况有一定程度的降低,取得了较好的效果。