losslessimagezipalgorithm
所属分类：压缩解压
开发工具：Visual C++
文件大小：124KB
下载次数：18
上传日期：2011-05-03 00:30:49
上 传 者：
岚熙
说明： 图像无损压缩算法代码全集,适合做图像无损压缩研究的入门人员收藏研究.
(AR002
Contains a complete archiver by Haruhiko Okumura. The archiver uses
an LZ engine whose output is compressed with static Huffman. The
file is chopped into pieces which all get their own independent
set of Huffman tree s. ARJ 2.41, ZIP 2.0 and PKZIP 2.04g use
essentially the same method. ZOO and LHA even use excactly the
same method.
LZW
The famous Lempel Ziv Welch compressor. This version by Kent Williams.
COMP
Arithmetic compression written by Mark R. Nelson. Published in
Dr Dobbs february 1991. Contains a basic arithmetic compressor
and a higher order arithmetic compressor.
ASH
A "brother" of the higher order compressor from Nelson written by
Charles Ashford. Ingenious program which makes use of the very limited
memory of the PC and still can process large files. One price to pay,
it is VERY slow. The tigthest compressor in the Dr Dobbs compression
contest.
FIN
Finish submission to the Dr Dobbs contest w)
文件列表:
losslessimagezipalgorithm\sfalic-03-src\bigendian.c (3549, 2004-10-09)
losslessimagezipalgorithm\sfalic-03-src\bigendian.h (3084, 2004-10-03)
losslessimagezipalgorithm\sfalic-03-src\bppmask.h (657, 2004-05-23)
losslessimagezipalgorithm\sfalic-03-src\cdf.c (9284, 2005-02-17)
losslessimagezipalgorithm\sfalic-03-src\cdfcmdline.c (6010, 2005-02-17)
losslessimagezipalgorithm\sfalic-03-src\cdfcmdline.h (200, 2004-01-04)
losslessimagezipalgorithm\sfalic-03-src\cdfpred.c (20910, 2004-11-08)
losslessimagezipalgorithm\sfalic-03-src\cdfpred.h (1114, 2004-11-07)
losslessimagezipalgorithm\sfalic-03-src\cdfstat.c (18128, 2005-02-17)
losslessimagezipalgorithm\sfalic-03-src\cdfstat.h (2334, 2005-02-17)
losslessimagezipalgorithm\sfalic-03-src\cdftypes.h (484, 2004-10-15)
losslessimagezipalgorithm\sfalic-03-src\ceillog2.h (295, 2004-02-13)
losslessimagezipalgorithm\sfalic-03-src\cfamily.c (5376, 2005-02-17)
losslessimagezipalgorithm\sfalic-03-src\cfamily.h (1346, 2005-02-17)
losslessimagezipalgorithm\sfalic-03-src\clalloc.c (1479, 2004-09-22)
losslessimagezipalgorithm\sfalic-03-src\clalloc.h (772, 2004-09-23)
losslessimagezipalgorithm\sfalic-03-src\encodecodeword.h (3707, 2004-10-03)
losslessimagezipalgorithm\sfalic-03-src\exitit.c (377, 2004-04-17)
losslessimagezipalgorithm\sfalic-03-src\exitit.h (305, 2005-02-17)
losslessimagezipalgorithm\sfalic-03-src\headers.c (2206, 2005-02-17)
losslessimagezipalgorithm\sfalic-03-src\headers.h (699, 2004-01-04)
losslessimagezipalgorithm\sfalic-03-src\str.h (136, 2004-05-23)
losslessimagezipalgorithm\sfalic-03-src\tabrand.c (4351, 2005-02-17)
losslessimagezipalgorithm\sfalic-03-src\tabrand.h (674, 2005-02-17)
losslessimagezipalgorithm\sfalic-03-src\taskparams.c (2248, 2005-02-17)
losslessimagezipalgorithm\sfalic-03-src\taskparams.h (2698, 2005-02-17)
losslessimagezipalgorithm\无损压缩算法集\ar002\ar.c (9965, 1992-10-18)
losslessimagezipalgorithm\无损压缩算法集\ar002\ar.h (1974, 1990-08-15)
losslessimagezipalgorithm\无损压缩算法集\ar002\decode.c (1118, 1992-10-18)
losslessimagezipalgorithm\无损压缩算法集\ar002\encode.c (8018, 1992-10-18)
losslessimagezipalgorithm\无损压缩算法集\ar002\huf.c (7105, 1992-10-18)
losslessimagezipalgorithm\无损压缩算法集\ar002\io.c (2365, 1992-10-18)
losslessimagezipalgorithm\无损压缩算法集\ar002\makefile (748, 1992-10-18)
losslessimagezipalgorithm\无损压缩算法集\ar002\maketbl.c (1525, 1992-10-18)
losslessimagezipalgorithm\无损压缩算法集\ar002\maketree.c (2630, 1992-10-18)
losslessimagezipalgorithm\无损压缩算法集\ash\arith.c (7788, 1992-01-15)
losslessimagezipalgorithm\无损压缩算法集\ash\arith.h (565, 1992-01-15)
losslessimagezipalgorithm\无损压缩算法集\ash\comp.h (1180, 1992-01-15)
losslessimagezipalgorithm\无损压缩算法集\ash\compress.c (3478, 1992-01-15)
... ...
1. The problem was caused by an overflow in the arithmetic coder
due to long strings of repeated characters. This has been
fixed.
2. The program now tests for repeated strings and bypasses the
scan procedure. This has improved the performance significantly
for the slowest files.
3. I have included all the source files and executables. Most of
the changes are in MODEL.C. I have made some minor changes to
some of the other routines, such as correcting spelling mistakes.
4. I have checked the underflow situation at end of file, and I am
still convinced that my method works. The version of the
arithetic coding algorithm published in the CACM presents random
bits to the decoder at end of file, so that the final value output
by the coder must include enough bits to allow the final symbol
to be resolved no matter what follows. This means outputting the
underflow bits plus two more to ensure the input value is bracketed
by the high and low limits.
I get around this problem by returning zeroes after the decoder
detects end of file.
Thank you for the chance to fix the problems.
Charles.
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