Entropy compression. Medical search. Frequent questions

The special structures in XML tend to allow certain improvements over the most naive compression techniques--some lossless document restructuring techniques can serve to improve compression ratios. (gnosis.cx)
I found in my earlier research (see Resources) that a custom XML-specific (lossless) document restructuring can improve subsequent compression. (gnosis.cx)
Internet Engineering Task Force (IETF) Y. Collet Request for Comments: 8878 M. Kucherawy, Ed. Obsoletes: 8478 Facebook Category: Informational February 2021 ISSN: 2070-1721 Zstandard Compression and the 'application/zstd' Media Type Abstract Zstandard, or "zstd" (pronounced "zee standard"), is a lossless data compression mechanism. (ietf.org)
LZ77 and LZ78 are the two lossless data compression algorithms published in papers by Abraham Lempel and Jacob Ziv in 1977 [1] and 1978. (wikipedia.org)
It's a lossless compression. (winxdvd.com)
Development files for libaec (Adaptive Entropy Coding library), a lossless compression library for low entropy data. (rpmfind.net)
But, really, my focus is on developing lossless data compression tools for all sorts of raster data, including both integer data and real-valued surfaces (fields). (mail-archive.com)

Lempel-Ziv style compression algorithms, in particular, take the strongest advantage of documents where recurrent strings occur relatively close together (the dictionary remains intact between occurrences). (gnosis.cx)
Data compression algorithms remove redundant information from a file. (wur.nl)
Besides their academic influence, these algorithms formed the basis of several ubiquitous compression schemes, including GIF and the DEFLATE algorithm used in PNG and ZIP . (wikipedia.org)
LZ77 algorithms achieve compression by replacing repeated occurrences of data with references to a single copy of that data existing earlier in the uncompressed data stream. (wikipedia.org)
90% compression ratio thanks to intraframe and interframe coding algorithms and entropy encoding. (winxdvd.com)
While the algorithms in the Blu-ray industrial standard were developed with the intention of optimizing data compression and error tolerance, they have also created quasi-random arrangement of islands and pits on the final media discs that are nearly optimized for photon management over the solar spectrum, regardless of the information stored on the discs. (nature.com)
Regardless of the media's content, the audio and video compression algorithms convert the data to a high-entropy binary sequence. (nature.com)

Differential Entropy: Definition, Properties. (iitk.ac.in)

The following algorithm can be shown using entropy compression to find such a solution when r is smaller by a constant factor than this bound: Choose a random truth assignment While there exists an unsatisfied clause C, call a recursive subroutine fix with C as its argument. (wikipedia.org)
Numerical results compare well with the limited available entropy estimates from the laborious thermodynamic integration method, while this new algorithm is much faster. (wur.nl)
Compression Algorithm 3.1. (ietf.org)
LZFSE is a Lempel-Ziv style data compression algorithm using Finite State Entropy coding. (nuget.org)
The patent describes a DCT-based image compression algorithm, and would later be a cause of controversy in 2002 (see Patent controversy below). (wikipedia.org)

As a result, isolated systems evolve toward thermodynamic equilibrium , where the entropy is highest. (wikipedia.org)
The differential Shannon entropy of information theory can change under a change of variables (coordinates), but the thermodynamic entropy of a physical system must be invariant under such a change. (researchgate.net)
We show that a canonical change of variables can, indeed, alter the spatial component of the thermodynamic entropy just as it alters the differential Shannon entropy. (researchgate.net)
However, there is also a momentum part of the entropy, which turns out to undergo an equal and opposite change when the coordinates are transformed, so that the total thermodynamic entropy remains invariant. (researchgate.net)
Since entropy is a function of the state, shouldn't the change in entropy for an irreversible adiabatic process between an initial and final equilibrium state be the same as that for a reversible adiabatic process between the same two thermodynamic equilibrium states? (physicsforums.com)

This file contains Huffman entropy encoding routines for progressive JPEG. (visopsys.org)
define JPEG_INTERNALS #include "jinclude.h" #include "jpeglib.h" #include "jchuff.h" /* Declarations shared with jchuff.c */ #ifdef C_PROGRESSIVE_SUPPORTED /* Expanded entropy encoder object for progressive Huffman encoding. (visopsys.org)
libjpeg-turbo is a JPEG image codec that uses processor instructions to accelerate JPEG compression and decompression. (nuget.org)
The JPEG Standards Committee is also looking at standardizing mezzanine video compression. (tvtechnology.com)
JPEG ( / ˈ dʒ eɪ p ɛ ɡ / JAY -peg , short for Joint Photographic Experts Group ) [2] is a commonly used method of lossy compression for digital images , particularly for those images produced by digital photography . (wikipedia.org)
JPEG typically achieves 10:1 compression with little perceptible loss in image quality. (wikipedia.org)
[8] JPEG compression is used in a number of image file formats . (wikipedia.org)

Existing methods combine hyperprior with local context in the entropy estimation function. (paperreading.club)
Specifically, the whole framework is a compression module, consisting of a unified auto-encoder which produces identically distributed latents for all frames, and a spatiotemporal entropy estimation model to minimize the entropy of these latents. (paperswithcode.com)

In recent deep image compression neural networks, the entropy model plays a critical role in estimating the prior distribution of deep image encodings. (paperreading.club)

compression ratio of static, adaptive Huffman encoding. (rebol.org)
Huffman) compression scheme with a separate pass through the data to replace all occurrences of ['^/' some '^-'] with '^/' and a single decimal digit that indicates how many tabs followed the linebreak (including 0, of course). (rebol.org)
FSE Compression of Huffman Weights 4.2.1.3. (ietf.org)
Data Compression: Block to variable length codes, Shannon Fano code, Huffman code, variable to fixed length coding Tunstal code, variable to variable length codes/ arithmetic code. (iitk.ac.in)

Using wavelet compression and a line-based entropy encoding, LLVC accomplishes low latency with line-based encapsulation. (tvtechnology.com)
returns default values for denoising or compression for the critically sampled discrete wavelet or wavelet packet transform. (mathworks.com)
input arguments to return the default global compression threshold for a wavelet packet transform. (mathworks.com)
Entropy type when denoising or compressing with wavelet packets, returned as a character vector. (mathworks.com)

not attempt to calculate entropies of subsections. (rebol.org)

utility, restructuring prior to compression can range anywhere from a very slight decrease in compression ratio to a bit better than a 10% improvement. (gnosis.cx)
This measure gives a bound on the data compression ratio that can be achieved. (wikipedia.org)
If the video compression ratio doesn't make you happen or the output quality is distorted, you can consider to resize your video using other iMovie alternatives. (winxdvd.com)
A preset dictionary can be used to improve the compression ratio. (go.dev)

Walraven, EF & Leermakers, FAM 2020, ' Entropy estimates of a hard sphere system by data compression of Monte Carlo simulation data ', Soft Matter , vol. 16, no. 15, pp. 3740-3745. (wur.nl)

Entropy is a scientific concept that is most commonly associated with a state of disorder, randomness, or uncertainty. (wikipedia.org)

Incidentally, with the addition of LZMA for high-resolution SRTM elevation data, compression rates are running about 1.9 bits per sample (more or less, depending on the terrain). (mail-archive.com)
data.bin [ 912 B/s] # ent data.bin Entropy = 7.998261 bits per byte. (digi.com)

We look at how basic theoretical ideas from data compression, such as the notions of entropy, mutual information, and complexity have been used for analyzing biological sequences in order to discover hidden patterns, infer phylogenetic relationships between organisms and study viral populations. (researchgate.net)
A measure analogous to information entropy is developed for individual sequences (as opposed to probabilistic ensembles). (wikipedia.org)

Data compression at its base is concerned with how information is organized in data. (researchgate.net)
Understanding this organization can lead to efficient ways of representing the information and hence data compression. (researchgate.net)
In this paper we review the ways in which ideas and approaches fundamental to the theory and practice of data compression have been used in the area of bioinformatics. (researchgate.net)
Introduction Zstandard, or "zstd" (pronounced "zee standard"), is a data compression mechanism, akin to gzip [RFC1952]. (ietf.org)
The structure in which this data is held is called a sliding window , which is why LZ77 is sometimes called sliding-window compression . (wikipedia.org)
I'm going to try to resist the temptation to get carried away by a discussion of cartography on this data compression mailing list (well, I'm going to try). (mail-archive.com)
In data compression, it is a measure of the amount of non-redundant and non-compressible data in an object (the amount that is not similar). (pcmag.com)
Additional topics may include data compression, filter design, and feature detection. (mit.edu)
data compression resource for everyone. (compression.ru)

In mathematics and theoretical computer science, entropy compression is an information theoretic method for proving that a random process terminates, originally used by Robin Moser to prove an algorithmic version of the Lovász local lemma. (wikipedia.org)

We present a novel analytical method to calculate conformational entropy of ideal cross-linking polymers from the configuration integral by employing a Mayer series expansion. (researchgate.net)

Before you can learn about the different compressors and compression methods, we first have to introduce you to the two basic principles for the compression of gas. (atlascopco.com)

There are different compression formats, but an old format is gzip. (lemire.me)

Estimating rényi entropy of discrete distributions. (dagstuhl.de)

uncompressed: Describes an arbitrary set of bytes in their original form, prior to being subjected to compression. (ietf.org)

Entropy is central to the second law of thermodynamics , which states that the entropy of an isolated system left to spontaneous evolution cannot decrease with time. (wikipedia.org)
0, and the entropy change for our spontaneous thermal equilibration process is positive. (physicsforums.com)

If we try to apply those same tricks to German, REBOL source code, or MP3 files, they will simply fail to help (at best) and can significantly degrade the compression (at worst). (rebol.org)
Instead, an entropy model is used to estimate the spatiotemporal redundancy in a latent space rather than pixel level, which significantly reduces the complexity of the framework. (paperswithcode.com)
password entropy, making dictionary attacks significantly easier to mount. (ietf.org)

Here, we apply this technique to estimate the entropy from Monte Carlo simulations of the hard sphere system. (wur.nl)

Typically, mezzanine compression ratios are from 2:1 to 8:1. (tvtechnology.com)

Larger sizes may slightly improve compression, but * 1000 is already well into the realm of overkill. (visopsys.org)

This module provides insight into this important topic plus the compression and error-control coding schemes used in communication systems. (postgraduatesearch.com)

The name "entropy compression" was given to this method in a blog posting by Terence Tao and has since been used for it by other researchers. (wikipedia.org)
Since the discovery of the entropy compression method, it has also been used to achieve stronger bounds for some problems than would be given by the Lovász local lemma. (wikipedia.org)
The maximum entropy method is a theoretically sound approach to construct an analytical form for the probability density function (pdf) given a sample of random events. (researchgate.net)

The key point is that an optimization hack that improves compression for a specific situations usually loses for others. (rebol.org)

The framework of dominant learned video compression methods is usually composed of motion prediction modules as well as motion vector and residual image compression modules, suffering from its complex structure and error propagation problem. (paperswithcode.com)

In this work, we propose a novel Global Reference Model for image compression to effectively leverage both the local and the global context information, leading to an enhanced compression rate. (paperreading.club)

It targets similar compression rates at higher compression and decompression speed compared to deflate using zlib. (nuget.org)

What are the two basic principles of compression? (atlascopco.com)
There are two generic principles for the compression of air (or gas): Positive displacement compression and dynamic compression. (atlascopco.com)

Recently, it has been suggested to use this technique to find the entropy from a simulation of a physical system. (wur.nl)

Inspired by the success of learned image compression through simplifying the framework with a single deep neural network, it is natural to expect a better performance in video compression via a simple yet appropriate framework. (paperswithcode.com)
Separating an image into cartoon and texture components comes useful in image processing applications, such as image compression, image segmentation, image inpainting. (arxiv.org)
The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image quality . (wikipedia.org)

The extent to which a file size is reduced is a measure of the entropy. (wur.nl)
Austrian physicist Ludwig Boltzmann explained entropy as the measure of the number of possible microscopic arrangements or states of individual atoms and molecules of a system that comply with the macroscopic condition of the system. (wikipedia.org)

Clearly this would increase compression for my REBOL code, but in most other cases (such as Carl's recommendation for using 4 spaces for each indentation instead of a tab) it would actually hurt the compression rate. (rebol.org)

Optimum compression would reduce the size of this 291808 byte file by 0 percent. (digi.com)

This paper extends its author's earlier research into compression of XML documents. (gnosis.cx)

PACIFIC PALISADES, CALIF.- For this month's blog, I thought we'd go over mezzanine video compression. (tvtechnology.com)
Mezzanine compression is defined as a level of video compression that reduces the video bitrate (bandwidth) so it can fit into professional videotape or storage devices while not being too aggressive, thus retaining the overall quality of the video. (tvtechnology.com)
Various digital video tape formats used mezzanine compression: D5-HD (4:1), HD CAM (2:1), DVC Pro (5:1), HD CAM SR (3:1), DigiBetacam (8:1). (tvtechnology.com)
Low Latency Video Compression, or LLVC, by Sony, has been document in SMPTE RDD34. (tvtechnology.com)
NDI's compression and SDK supports multiple video and audio streams transported over IP networks. (tvtechnology.com)
While compression opens up bandwidth, there are also choices in terms of the amount of compression/bandwidth, bit depth (10-bit or higher) and the format of the video (4:2:0, 4:2:2, 4:4:4, HD, UHD-I or II). (tvtechnology.com)
Well, mezzanine compression has proven to be workable for storage of video. (tvtechnology.com)
But will mezzanine video compression be acceptable for live video streaming inside a video production? (tvtechnology.com)

PX9 is a lightweight gfx & map compression library, intended to replace PX8 . (lexaloffle.com)

This difference is puzzling, because the Shannon and Gibbs entropies have the same functional form. (researchgate.net)

Other companies cited as patent holders include AT&T (two patents) and Canon Inc. [1] Absent from the list is U.S. Patent 4,698,672 , filed by Compression Labs ' Wen-Hsiung Chen and Daniel J. Klenke in October 1986. (wikipedia.org)

We specially collect and write materials popularly explaining main points of various compression methods functioning. (compression.ru)

How do you determine the change in entropy for a closed system that is subjected to an irreversible process? (physicsforums.com)
My objective in this article is to offer my cookbook recipe for determining the change in entropy for an irreversible process on a closed system, and then to provide a few examples of how this recipe can be applied. (physicsforums.com)
NDI's compression is designed to work in software and is the basis for Newtek's Tricaster production system. (tvtechnology.com)

We furthermore show how one may correctly write the change in total entropy for an isothermal physical process in any set of spatial coordinates. (researchgate.net)
If I have an irreversible adiabatic process, shouldn't the change in entropy be zero since q/T is zero? (physicsforums.com)
Plus, there is an infinite number of reversible process paths that can take you from the initial state to the final state, and they will all give exactly the same value for the change in entropy. (physicsforums.com)
This will be your change of entropy S. That is, ##\Delta S=\int\frac{dq_{rev}}{T}##, where the subscript rev refers to the reversible path. (physicsforums.com)
This will be the change of entropy. (physicsforums.com)

Choose a high compression codec HEVC as output codec. (winxdvd.com)

It could be very desirable to have one mezzanine compression standard, but is this necessary for adoption? (tvtechnology.com)

Anatomy7

Diseases14

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Analytical, Diagnostic and Therapeutic Techniques and Equipment29

Phenomena and Processes18

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