lossless compression


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lossless compression

A compression technique that decompresses data back to its original form without any loss. The decompressed file and the original are identical. All compression methods used to compress text, databases and other business data are lossless. For example, the ZIP archiving technology (PKZIP, WinZip, etc.) is the most widely used lossless method (see ZIP file).

Lossless Audio
Although compression methods used for audio and video are generally "lossy" and discard bits deemed unnecessary, there are lossless methods used to compress digital music files. FLAC, Apple Lossless (ALAC) and WMA Lossless are examples of lossless compression music formats. For example, they compress a music CD to less than its original size, but the resulting file is nowhere near as small as MP3 and AAC. However, no bits (no frequencies) are discarded. See lossy compression, high-resolution audio, Apple Lossless, WMA Lossless, FLAC and codec examples.


References in periodicals archive ?
Previously, in determining whether to apply lossless compression to data based on the identification of duplication in that data, it was necessary to read the data twice, both before and after the duplication identification was executed on the FPGA, increasing overhead and preventing the system from delivering sufficient performance.
As a result, only lossless compression allows for reconstructing the original image perfectly.
The entropy coding stage is a lossless compression strategy.
A hybrid lossless compression scheme for efficient delivery of medical image data over the internet.
These innovative and high- performance modems combine DVB-S2, Adaptive Coding and Modulation (ACM), K4 GZIP lossless compression, redundancy and DoubleTalk Carrier-in-Carrier technologies and provide efficiencies and throughput that benefit even the most demanding point-to-point and backhaul links.
Specifically, the groups will evaluate cost-effective compression proposals and techniques that deliver visually lossless compression while substantially reducing display interface bandwidth.
How can you achieve lossless compression in your own writing?
Lossless compression algorithms generate compressed data in such a form so that the original input data can be later retrieved with no distortion.
1 includes new features such as: a client-side console which allows the user to fine-tune the image compression level according to network conditions and client device capabilities and to monitor the actual bandwidth usage and frame rate; a new server side component that provides diagnostic information; a high performance lossless compression algorithm that has been implemented for such applications requiring pixel-perfect remotisation; a mechanism which limits the number of frames sent on the network has been introduced which reduces bandwidth utilization on LAN and WAN environments; and the new version of DCV ensures confidentiality by encrypting the image stream using the standard AES algorithm (128 or 256-bit keys).
For lossless compression, we proposed an integer multiresolution transformation, similar to the wavelet transform, which we called S+P transform.
Currently the format of choice for lossless compression on the web is PNG, however Google claims that they can get an average of 45% reduction in size compared to PNG.
With JPEG 2000 compression, service providers can achieve visually and mathematically lossless compression to preserve video quality; transport streams offer the control and monitoring capabilities broadcasters are used to; and protection switching provides redundancy to ensure SLAs are adhered to.