In this study, we describe possibilities of adding encryption to the compression features of Huffman algorithm. The encryption ciphers used are Polyalphabetic substitution cipher (public key) and Stream cipher (private key). The former encodes by representing two or more ciphertext in the substitution...
Huffman codes are being widely used as a very efficeint technique for compressing data. To achieve high compressing ratio, some properties of encoding and decoding for canonical Huffman tree are disscussed. A study and accomplishment of the Huffman algorithm based on condensed Huffman table are stud...
This paper presents the development of lossless compression, the principle of Huffman, optimize and realize the Huffman algorithm, which made the ratio of data compression more effective. The results of the experiment prove this method is validity....
编码器: 包括 Huffman 编码和Shannon-Fano 编码。 3、编码加密 经典加密: 如 Caesar、Vigenere、Hill 编码器。 声音编码: 如 NYSIIS、Soundex、Feistel。 现代加密: 如 Blowfish。 4、图算法 最小生成树: Prim 算法和Kruskal 算法。 搜索: 包括广度优先搜索(BFS)和深度优先搜索(DFS)。 最短路径: Dijkstra、Flo...
HuffDecode: HuffDecode recursively decodes the binary code in, by traversing the Huffman compression tree pointed by root. current stores the current node of the traversing algorithm. out stores the current decoded string. HuffEncode: HuffEncode encodes the string in by applying the mapping defined ...
Research on data compression technology based on Huffman algorithm Describes meaning of data compression, basic principles of data compression and Huffman coding algorithm, and discusses the types of data compression and data... SJ Yao 被引量: 0发表: 2012年 Research and Realization of ECG Data Los...
In this letter, we propose a generic and efficient algorithm that can construct both asymmetrical and symmetrical reversible variable-length codes (RVLCs). Starting from a given Huffman code, the construction is based on two developed codeword selection mechanisms, for the symmetrical case and the ...
Then, based on the dictionary data, the Huffman algorithm implementation procedure is started, during which a code is determined for each index coded in the first stage, with a length inversely proportional to the frequency of its occurrence. This means that symbols and their concatenations, ...
We also generated fire perimeters using the FIRED algorithm (https://www.github.com/earthlab/firedpy) for fire events in North America and South America from May 2017 to July 2020 (https://scholar.colorado.edu/concern/datasets/d217qq78g). Source data are provided with this paper....
简介(Introduction) 给定 $n$ 个权值作为个叶子结点,构造一棵二叉树,若该树的带权路径长度(WPL)达到最小,称这样的二叉树为最优二叉树,也称为哈夫曼树 (Huffman Tree)。 哈夫曼树是带权路径长度最短的树,权值较大的节点离根较近。 描述(Description) 初始化: