COMPRESSIon

压缩(COMPRESSIon)：压缩是制作数字电影的一个重要感念。视频和音频在数字化过程中都可以通过电脑进行压缩。当声音和画面被压缩后，他们可以更高效的得到CPU的处理并减少视频及音频文件占用的硬盘空间。压缩也是视频在网络上传播的关键，必须将文件大小压缩至带宽允许的程度才可以被用户下载。

zlib is designed to be a free, general-purpose, legally unencumbered -- that is, not covered by any

zlib is designed to be a free, general-purpose, legally unencumbered -- that is, not covered by any patents -- lossless data-COMPRESSIon library for use on virtually any computer hardware and operating system. The zlib data format is itself portable across

标签： general-purpose unencumbered designed covered

上传时间： 2014-01-13

上传用户：hfmm633
包含了对于灰度图像的8种jpeg无损压缩的预测方法

包含了对于灰度图像的8种jpeg无损压缩的预测方法，这是用来学习jpeg loseless COMPRESSIon的非常好的例子。idc.h为头文件, image_size.c和readimage.c用来读取目标文件的大小和每个像素的灰度值, jpegll_enc.c和jpegll_dec.c为编码和解码文件。

标签： jpeg 灰度图像无损压缩预测方法

上传时间： 2016-04-22

上传用户：love1314
I ve written some many years ago dynamic Huffman algorithm to compress and decompress data. It is ma

I ve written some many years ago dynamic Huffman algorithm to compress and decompress data. It is mainly targeted to data with some symbols occuring more often than the rest (e.g. having some data file consisted of 3 different symbols and their total number of occurence in that file s1(1000), s2(200), s3(30) so the total length of file is 1000+200+30=1230 bytes, it will be encoded assigning one bit to s1 and 2 bits to s2, s3 so the encoded length will be 1*1000+2*(200+30)=1460 bits=182 bytes). In the best case the file consisted of just one symbol will be encoded with COMPRESSIon ratio as 1:8. Huffman coding is used in image COMPRESSIon, however in JPEG2000 arithmetic codec is imployed.

标签： decompress algorithm compress Huffman

上传时间： 2016-05-16

上传用户：aysyzxzm
EZW Embedded Zero-tree Wavelets Encoding,video codecs from the EZW family which use a 3D version of

EZW Embedded Zero-tree Wavelets Encoding,video codecs from the EZW family which use a 3D version of EZW or SPIHT algorithms showed better performance than the MPEG-2 COMPRESSIon algorithm. These algorithms have many advantages inherent for wavelet based schemes and EZW-like coders. Their most important advantages are good COMPRESSIon performance and scalability.

标签： EZW Zero-tree Embedded Wavelets

上传时间： 2013-12-20

上传用户：wsf950131
These three articles involves the combination of wavelet and MCTF. MCTF means motion-compensated-tim

These three articles involves the combination of wavelet and MCTF. MCTF means motion-compensated-time-filter. It makes wavelet transform more popular because of the high COMPRESSIon efficiency.

标签： motion-compensated-tim MCTF combination articles

上传时间： 2013-11-25

上传用户：cc1015285075
A few short years ago, the applications for video were somewhat confined—analog was used for broad

A few short years ago, the applications for video were somewhat confined—analog was used for broadcast and cable television, VCRs, set-top boxes, televisions and camcorders. Since then, there has been a tremendous and rapid conversion to digital video, mostly based on the MPEG-2 video COMPRESSIon standard. Today, in addition to the legacy DV, MPEG-1 and MPEG-2 audio and video com- pression standards, there are three new high- performance video COMPRESSIon standards. These new video codecs offer much higher video COMPRESSIon for a given level of video quality.

标签： applications for confined somewhat

上传时间： 2016-10-29

上传用户：bjgaofei
MPEG-2 has 7 distinct parts as well. The first part is the Systems section which defines the contain

MPEG-2 has 7 distinct parts as well. The first part is the Systems section which defines the container format and the Transport Streams that are designed to carry the digital video and audio over ATSC and DVB. The Program Stream defines the container format for lossy COMPRESSIon on optical disks, DVDs and SVCDs.

标签： the distinct Systems defines

上传时间： 2014-07-02

上传用户：奇奇奔奔
H.264/AVC, the result of the collaboration between the ISO/IEC Moving Picture Experts Group and the

H.264/AVC, the result of the collaboration between the ISO/IEC Moving Picture Experts Group and the ITU-T Video Coding Experts Group, is the latest standard for video coding. The goals of this standardization effort were enhanced COMPRESSIon efficiency, network friendly video representation for interactive (video telephony) and non-interactive applications (broadcast, streaming, storage, video on demand). H.264/AVC provides gains in COMPRESSIon efficiency of up to 50％ over a wide range of bit rates and video resolutions compared to previous standards. Compared to previous standards, the decoder complexity is about four times that of MPEG-2 and two times that of MPEG-4 Visual Simple Profile. This paper provides an overview of the new tools, features and complexity of H.264/AVC.

标签： the collaboration between Experts

上传时间： 2013-12-30

上传用户：dongbaobao
200-MHz ARM920T Processor • 16-kbyte Instruction Cache • 16-kbyte Data Cache •

200-MHz ARM920T Processor • 16-kbyte Instruction Cache • 16-kbyte Data Cache • Linux® , Microsoft® Windows® CE-enabled MMU • 100-MHz System Bus • MaverickCrunch™ Math Engine • Floating Point, Integer, and Signal Processing Instructions • Optimized for digital music COMPRESSIon and deCOMPRESSIon algorithms. • Hardware interlocks allow in-line coding. • MaverickKey™ IDs • 32-bit Unique ID can be used for DRM-compliant 128-bit random ID. • Integrated Peripheral Interfaces • 32-bit SDRAM Interface

标签： 8226 Cache kbyte Instruction

上传时间： 2017-04-08

上传用户：comua
The purpose of this study is to compare between the to methods which is JPEG and JPEG2000 that are u

The purpose of this study is to compare between the to methods which is JPEG and JPEG2000 that are using in lossless image COMPRESSIon .

标签： JPEG purpose compare between

上传时间： 2014-01-15

上传用户：cccole0605