Description: LZW压缩算法简介
作者:宋成
描述:一篇关于LZW压缩算法简介的文章，通俗易懂，值得一看！
备注:该文章整理自软件报1998年合订本上册。
LZW压缩算法是一种新颖的压缩方法，由Lemple-Ziv-Welch 三人共同创造，用他们的名字命名。它采用了一种先进的串表压缩不，将每个第一次出现的串放在一个串表中，用一个数字来表示串，压缩文件只存贮数字，则不存贮串，从而使图象文件的压缩效率得到较大的提高。奇妙的是，不管是在压缩还是在解压缩的过程中都能正确的建立这个串表，压缩或解压缩完成后，这个串表又被丢弃。
-LZW compression algorithm brief Authors : Song Description : one on the LZW compression algorithm brief article, accessibly, an eye-catcher! Note : The article reported software collated since 1998 on the consolidated list. LZW compression algorithm is a new compression method by Lemple - Ziv-Welch, the three work together to create and use their names. It adopted a series of advanced non-compressed form, each of the first series on a string form, with a string of figures to show that compressed files only digital storage, not storing strings, thus the document image compression efficiency significantly. Magically, whether it is in compression or decompression process can correct the establishment of this series table Compression or decompress after the completion of the series table also Platform: |
Size: 4861 |
Author:邓海波 |
Hits:
Description: RC5－CTS模式加密解密算法C++程序实现。
解压之后运行main.dsw.在VC++下面打开，执行之后根据显示首先输入密钥（随便输入不超过16字节的字符串），之后提示输入需要加密的plaintext文件,输入plaintext1.txt，这个文件在压缩包里已经存在，(注意一定要写清楚文件类型名，是个文本文件)，然后根据提示输入加密文件名，可随便输入一个文件名，但是别忘记了类型名.txt，如ciphertext1.txt。因为不输入类型名将来无法打开。之后输入解密之后的文件名，可输入decrypted.txt
结束。
之后打开生成的ciphertext1.txt和decrypted.txt，还有原来的明文文件plaintext1.txt,可以看出decrypted.txt和plaintext1.txt内容一致。ciphertext1.txt由plaintext1.txt加密得到，而decrypted.txt由ciphertext1.txt解密得到-RC5 - CTS mode encryption and decryption algorithm C program. After running main.dsw decompression. The VC Below opened, after the implementation of the first to suggest that the importation of key (casual importing more than 16 byte string), followed by the need to import suggest encrypted plaintext documents, the importation of plaintext1.txt, this document compression bag already exists. (Note that certain types of documents to write clearly, is the text document), then prompted to input encrypted file name, could easily enter a file name, but not forget the type name. txt, as ciphertext1.txt. Because we do not import the type who could not open the future. After following the importation of declassified documents, and can import decrypted.txt end. After opening generated ciphertext1.tx Platform: |
Size: 10983 |
Author:郭佳 |
Hits:
Description: 字符串的压缩与解压，输入一字符串文件，压缩后得一文件，在经解压得原文件。大家一起分享。-string compression and decompression, the importation of a string, in a compressed file, after decompression in the original document. To share with everyone. Platform: |
Size: 65013 |
Author:东方旭 |
Hits:
Description: 利用Java实现zip压缩/解压缩。randomData()函数随机生成50个double数据,并放在doc字符串变量中 openFile()函数读取ZIP压缩文件 saveFile()函数将随机生成的数据存到ZIP格式的压缩文件中。-use Java zip compression/decompression. RandomData () function randomly generated 50 double data and on the doc string variable openFile () function to read ZIP compressed files saveFile () function to generate random data onto the compressed ZIP format documents. Platform: |
Size: 2048 |
Author:潘振瑶 |
Hits:
Description: 字符串的压缩与解压，输入一字符串文件，压缩后得一文件，在经解压得原文件。大家一起分享。-string compression and decompression, the importation of a string, in a compressed file, after decompression in the original document. To share with everyone. Platform: |
Size: 64512 |
Author:东方旭 |
Hits:
Description: 基于LSB的图像中数据加密隐藏算法程序
图像的组成无非是一些字符串或者一些字节组成的字符串，然而，每一个字节数据位的重要度并不是一样的，两个相邻字节往往只有低位是不一样的。例如：00100110和00100111代表了两个不同渐变度的红色，但是就人眼是分辨不出来的。最低有效位LSB算法，就是利用这一点，达到图像压缩，或者数字水印的功能。 -LSB of the image-based data encryption to hide the image composition algorithm procedure is nothing more than some number of bytes or string composed of string, however, one byte for each data bit is not an important degree of the same, and two adjacent words section, usually only low level is not the same. For example: 00100110 and 00100111 represent the gradient of two different degrees of red, but on the human eye is not out to tell. Least significant bit LSB algorithm, is to take advantage of this point, to achieve image compression, or digital watermark feature. Platform: |
Size: 248832 |
Author:aaa |
Hits:
Description: Codes".
Huffman coding uses a specific method for choosing the representation for each symbol, resulting in a prefix code (sometimes called "prefix-free codes") (that is, the bit string representing some particular symbol is never a prefix of the bit string representing any other symbol) that expresses the most common characters using shorter strings of bits than are used for less common source symbols. Huffman was able to design the most efficient compression method of this type: no other mapping of individual source symbols to unique strings of bits will produce a smaller average output size when the actual symbol frequencies agree with those used to create the code. A method was later found to do this in linear time if input probabilities (also known as weights) are sorted.-Codes".
Huffman coding uses a specific method for choosing the representation for each symbol, resulting in a prefix code (sometimes called "prefix-free codes") (that is, the bit string representing some particular symbol is never a prefix of the bit string representing any other symbol) that expresses the most common characters using shorter strings of bits than are used for less common source symbols. Huffman was able to design the most efficient compression method of this type: no other mapping of individual source symbols to unique strings of bits will produce a smaller average output size when the actual symbol frequencies agree with those used to create the code. A method was later found to do this in linear time if input probabilities (also known as weights) are sorted.
Platform: |
Size: 1024 |
Author:muhammad |
Hits:
Description: 字符串压缩源代码，用户字符串的加密解密，有需要的朋友拿去吧。-String compression source code, user string encryption and decryption, there is need of a friend take it. Platform: |
Size: 189440 |
Author:静水深流 |
Hits:
Description: 将给定的字符串，按照规格压缩，输出压缩后的字符串。压缩规格为：相同字符连续，则压缩为“字符+数字个数”，如”aaaa”压缩为”a4”-Given string, in accordance with specifications compression, the compressed output string. Compression standard is: the same character continuously, then the compression is " the number of characters+ numbers" such as " aaaa" compressed " a4" Platform: |
Size: 1024 |
Author:康悦 |
Hits:
Description: 本程序支持两项功能：（1）支持鼠标拖入并播放Flash文件，支持文件类型判断，窗口大小可任意缩放；（2）支持zlib压缩与解压缩功能，实现字符串的压缩与解压缩。
本工程本意是支持播放压缩的Flash文件，目前只实现了基本的前两步。-This program supports two functions: (1) support mouse drag and play a Flash file, supported file types to determine the window size can be any scaling (2) support the zlib compression and decompression functions for string compression and decompression. This project is intended to support the broadcast compressed Flash files, currently only the first two steps to achieve the basic. Platform: |
Size: 122880 |
Author:Fedork |
Hits:
Description: 本文主要介绍CCITT v.42bis建议的压缩算法的主要特点，以及实现该算法的数据结构，形成新串的方法，动态维护字典的方法和指针编码，并给出V.42bis建立的模拟结果。V.42压缩可以用于SNDCP子层分组数据部分的压缩。-This paper describes the main features recommended by the CCITT v.42bis compression algorithm, and the data structure of the algorithm, to form a new string method, the dynamic maintenance of the dictionary and the pointer encoding, and gives the V.42bis established simulation results. V.42 compression can be used for part of the SNDCP sublayer packet data compression. Platform: |
Size: 358400 |
Author:曾秀姗 |
Hits:
Description: 这个库用于压缩程序中的字符串，如果程序对于数据长度比较敏感，此程序可以压缩其中的字符串从而减少传输的数据的长度-This library is used in a string compression program, if the program for the data length is sensitive, this procedure where the string can be compressed to reduce the length of the data transmitted Platform: |
Size: 8192 |
Author:xuming |
Hits:
Description: 通过键盘输入一串小写字母(a~z)组成的字符串。请编写一个字符串压缩程序，
将字符串中连续出席的重复字母进行压缩，并输出压缩后的字符串。
压缩规则：
1. 仅压缩连续重复出现的字符。比如字符串"abcbc"由于无连续重复字符，压缩后的字符串还是"abcbc".
2. 压缩字段的格式为"字符重复的次数+字符"。例如：字符串"xxxyyyyyyz"压缩后就成为"3x6yz"-Through the keyboard input string lowercase letters (a ~ z) consisting of the string. Please write a string compression program,
The presence of a continuous string of letters repeated compression, and outputs the compressed string.
Compression rules:
1 continuous compression only recurring characters. Such as the string "abcbc" because without continuous repeating characters, compressed string or "abcbc".
2 compression format field "character of repetitions+ character." For example: the string "xxxyyyyyyz" compression after a "3x6yz" Platform: |
Size: 1024 |
Author:丽丽 |
Hits:
Description: lzss,实现了字符串压缩 解压实现，只是在奥村的LZSS.c上稍稍修改-Implemented LZSS, the string compression decompression, just in the village of LZSS. C on modified slightly Platform: |
Size: 455680 |
Author:gjt |
Hits:
Search - string compression