change wall paper

实现哈夫曼的编码和译码，适用于各种图像格式。-Realize Huffman encoding and decoding for a variety of image formats.

【文本与二值图像的游程】1. 文本游程压缩的原理 对重复字段采用3符号标识法：(1) 重复提示符,比如@,#等；(2) 游程长度参数或重复次数,若用一个字节表示,最大长度可为255个重复字；(3) 重复字符。以上三部分合称为重复因子。可见要获得压缩效益，重复字符应在3个以上。2. 图像游程压缩的原理 对于二值图像，原始数据为零一矩阵，压缩时逐行处理该矩阵：(1) 连续n个1，表示为+n；(2) 连续n个0，表示为-n。-text and binary image-- an outbound trip. Yu Cheng text compression principle on repeated field using three symbols logo Act : (a) repeat prompt, such as @,#, etc.; (2) Run-length parameters, or the number of repeat, if using a byte, the largest the length of 255 to repeat the word; (3) repeat characters. More than three as part of a repeat factor. Visibility to gain compression efficiency, duplication of characters in three more. 2. Run-image compression for the principle of two binary images, a zero original data matrix, progressive compression deal with the matrix : (1) n a row, n; (2) consecutive n 0, expressed as-n.

jpeg2000算法实现-JPEG2000 algorithm

这是BAC(二值算数编码) 这是我自己提供的 主要是可是可适应性的编码功能 -This is the BAC (Binary Arithmetic Coding) This is my own but is mainly provided by the encoding function can be adaptive

压缩/解压缩类源码-compression/decompression source category

实现Huffman编码统计压缩算法，并对自定义文件进行压缩和解压。实现了vc界面，不错的程序。-achieve statistical compression algorithm, as well as from the definition files for compression and decompression. To achieve the vc interface, good procedures.

lz77算法原代码，压缩比率20 ~90 .-lz77 algorithm for the original code, compression ratio 20 ~ 90 .

How to programm c++ language ?

h261协议的h261编码码,lib_261.h里面提供了详细的接口和说明.-agreement h261 coding yards inside lib_261.h provided a detailed interface and annotations.

计算表达式的值。直接输入表达式，得到计算结果，非常好用。-Calculation of expression value. Enter the expression directly, the calculation results, very easy to use.