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Measurement of the power of a data compression algorithm
Data compression ratio, also known as compression power, is a measurement of the relative reduction in size of data representation produced by a data
Data_compression_ratio
Combustion chamber capacity ratio
The compression ratio is the ratio between the maximum and minimum volume during the compression stage of the power cycle in a piston or Wankel engine
Compression_ratio
Compact encoding of digital data
In information theory, data compression, source coding, or bit-rate reduction is the process of encoding information using fewer bits than the original
Data_compression
Data compression approach allowing perfect reconstruction of the original data
Lossless compression is a class of data compression that allows the original data to be perfectly reconstructed from the compressed data with no loss
Lossless_compression
Metric used to measure signal quality
published a variant for varying frame delays. Czekanowski distance Data compression ratio Perceptual Evaluation of Video Quality (PEVQ) Structural similarity
Peak_signal-to-noise_ratio
Type of data compression
technology, lossy compression, or irreversible compression, is the class of data compression methods that uses inexact approximations and partial data discarding
Lossy_compression
Lossless data compression algorithms
LZ77 and LZ78 are the two lossless data compression algorithms published in papers by Abraham Lempel and Jacob Ziv in 1977 and 1978. They are also known
LZ77_and_LZ78
Lossless compression algorithm
a good trade-off between speed and compression ratio. Typically, it has a smaller (i.e., worse) compression ratio than the similar LZO algorithm, which
LZ4_(compression_algorithm)
Type of GIS data format
convert SDC data to a geodatabase. ArcGIS Pro does not support the SDC format at all. Compression ratios range from 8x to 20x depending on the data source
Smart_Data_Compression
Lossless compression algorithm
Deflate (stylized as DEFLATE, and also called Flate) is a lossless data compression algorithm that uses a combination of LZ77 and Huffman coding. It was
Deflate
Reduction of image size to save storage and transmission costs
Image compression is a type of data compression applied to digital images, to reduce their cost for storage or transmission. Algorithms may take advantage
Image_compression
Lossy audio compression format
widespread acceptance for PC and Internet applications. MP2 has a lower data compression ratio than MP3, but is also less computationally intensive. MPEG-1 Audio
MPEG-1_Audio_Layer_II
Set of standards for multimedia file and streaming formats
– a video compression standard that doubles the data compression ratio compared to H.264/MPEG-4 AVC Part 3: 3D Audio – an audio compression standard for
MPEG-H
Performance metric for lossless compression
fictional tech start-up working on a data compression algorithm. It compares both required time and compression ratio of measured applications, with those
Weissman_score
Standardized means of organizing and storing digital images
it features a high data compression ratio, based on a subset of the HEVC video compression standard, including lossless compression. In addition, it supports
Image_file_format
Digital audio format
speech-coding algorithm with auditory masking that achieved a significant data compression ratio for its time. IEEE's refereed Journal on Selected Areas in Communications
MP3
Audio signal processing operation
perceived effect. A limiter is a compressor with a high ratio and, generally, a short attack time. Compression is used to improve performance and clarity in public
Dynamic_range_compression
Universal lossless data compression algorithm
best on data with repeated patterns, so the initial parts of a message see little compression. As the message grows, however, the compression ratio tends
Lempel–Ziv–Welch
Topics referred to by the same term
forces Compression member, a structural element such as a column Compressibility, susceptibility to compression Gas compression Compression ratio, of a
Compression
Methods of compressing data tailored specifically for genomic data
typically the case in genomic sequence data). The compression ratio of currently available genomic data compression tools ranges between 65-fold and 1,200-fold
Compression of genomic sequencing data
Compression_of_genomic_sequencing_data
Data format and compression library
zlib (/ˈziːlɪb/ or "zeta-lib", /ˈziːtəˌlɪb/) is a data format and a lossless data compression software library created by Jean-Loup Gailly and Mark Adler
Zlib
Measure of material deformation perpendicular to loading
Poisson's ratio is near 0.5. For open-cell polymer foams, Poisson's ratio is near zero, since the cells tend to collapse in compression. Many typical
Poisson's_ratio
Algorithms for compressing in-memory data
memory compression (also referred to as RAM compression and memory compression) is a memory management technique that utilizes data compression to reduce
Virtual_memory_compression
Technique to compress data
not always optimal among all compression methods – it is replaced with arithmetic coding if a better compression ratio is required. In 1951, David A
Huffman_coding
Maximum rate of data transfer
DCT compression significantly reduces the amount of memory and bandwidth required for digital signals, capable of achieving a data compression ratio of
Bandwidth_(computing)
Fast data compression and decompression library written in C++ by Google
mode. The compression ratio is 20–100% lower than gzip. Snappy is widely used in Google projects like Bigtable, MapReduce and in compressing data for Google's
Snappy_(compression)
Type of prefix code
In data compression, a universal code for integers is a prefix code that maps the positive integers onto binary codewords, with the additional property
Universal code (data compression)
Universal_code_(data_compression)
Lossless compression algorithm
is tunable with compression levels ranging from negative 7 (fastest) to 22 (slowest in compression speed, but best compression ratio). Starting from version
Zstd
Video of higher resolution than original television
DCT compression significantly reduced the amount of memory and bandwidth required for digital video, capable of achieving a data compression ratio of around
High-definition_video
Lossless compression algorithm
data compression algorithm developed by Jyrki Alakuijala and Zoltán Szabadka. It uses a combination of the general-purpose LZ77 lossless compression algorithm
Brotli
Lossless data compression method
Golomb coding is a lossless data compression method using a family of data compression codes invented by Solomon W. Golomb in the 1960s. Alphabets following
Golomb_coding
Capability that can be built into web servers and web clients
HTTP compression is a capability that can be built into web servers and web clients to improve transfer speed and bandwidth utilization. HTTP data is compressed
HTTP_compression
Topics referred to by the same term
in data compression: Universal code (data compression), a fixed prefix code that, for any probability mass function, has a data compression ratio within
Universal_coding
Electronic moving image
century, digital video has become the dominant form, enabling efficient compression, storage, editing, and distribution across broadcast television, physical
Video
Lossless compression algorithm
dictionary compression scheme somewhat similar to the LZ77 algorithm published by Abraham Lempel and Jacob Ziv in 1977 and features a high compression ratio (generally
LZMA
Revelation of secrets to unauthorized parties
leakage is the leakage of secret information via data compression, by using variations in data compression ratio to reveal correlations between known (or deliberately
Information_leakage
HTTPS security vulernability
CRIME (Compression Ratio Info-leak Made Easy) is a security vulnerability in HTTPS and SPDY protocols that utilize compression, which can leak the content
CRIME
Computer format for digital audio
lossy compression. The data can be a raw bitstream in an audio coding format, but it is usually embedded in a container format or an audio data format
Audio_file_format
Lossless data compression scheme
lossless data compression method that attempts to approach the lower bound declared by Shannon's source coding theorem, which states that any lossless data compression
Entropy_coding
Class of video frames processed in a distinct way by a compression algorithm
different advantages and disadvantages, centered mainly around amount of data compression. These different algorithms for video frames are called picture types
Video compression picture types
Video_compression_picture_types
Loss of quality between copies
is the loss of quality between subsequent copies or transcodes of data. Compression, as well as up-scaling (with images) or up-sampling (with sound and
Generation_loss
Open-source file archiver
similarities throughout the data using a stacked combination of filters. These can consist of pre-processors, compression algorithms, and encryption filters
7-Zip
Means of compressing an executable file
Executable compression is any means of compressing an executable file and combining the compressed data with decompression code into a single executable
Executable_compression
Series of data compression archivers
lossless data compression archivers that have gone through collaborative development to top rankings on several benchmarks measuring compression ratio (although
PAQ
Measurement of power meeting specifications
This real time compression algorithm, performed independent of the sampling, prevents data gaps and has a typical 1000:1 compression ratio. A typical function
Electric_power_quality
Data compression algorithm
balance between compression ratio and compression speed, without affecting the speed of decompression LZO supports overlapping compression and in-place decompression
Lempel–Ziv–Oberhumer
Malicious archive file designed to disrupt the program or system reading it
zip file inside another zip file, it is possible to overcome the compression ratio limit of deflate (1032:1). A famous example of a recursive zip bomb
Zip_bomb
American aircraft engine
compression ratio 7.00:1. Same as E3D but with conical mounts. O-320-A3A 150 hp (112 kW) at 2,700 rpm, Minimum fuel grade 80/87 avgas, compression ratio
Lycoming_O-320
Technique used in signal processing and data compression
achieving high quality at high data compression ratios. However, blocky compression artifacts can appear when heavy DCT compression is applied. The DCT was first
Discrete_cosine_transform
Binary XML format
used. Nevertheless, even in schemaless mode, EXI delivers better data compression ratios than Fast Infoset while being more efficient in both processing
Efficient_XML_Interchange
Open-source software for compressing video games
program includes an option to skip compressing files with a poor data compression ratio, such as files already compressed via another method. CompactGUI
CompactGUI
Lossy compression method for reducing the size of digital images
lossless data formats). In April 2024, Google introduced Jpegli, a new JPEG coding library that offers enhanced capabilities and a 35% compression ratio improvement
JPEG
Security vulnerability against HTTPS
and TLS compression combined. BREACH is an instance of the CRIME attack against HTTP compression—the use of gzip or DEFLATE data compression algorithms
BREACH
File format and file compression program
gzip-compatible files, using an internal DEFLATE implementation with better compression ratios than gzip itself—at the cost of more processor time compared to the
Gzip
Data processing technique to eliminate duplicate copies of repeating data
to the saved copy for deduplication ratio of roughly 100 to 1. Deduplication is often paired with data compression for additional storage saving: Deduplication
Data_deduplication
Aircraft engines manufactured by Continental Motors
80/87 avgas, compression ratio 6.0:1. Uses a TCM 639230A3 or 6006 fuel injector. Same as IO-360-A except for reduced compression ratio and rated power
Continental_IO-360
IANA. Compression-only formats should often be denoted by the media type of the decompressed data, with a content coding indicating the compression format
List_of_archive_formats
Form of entropy encoding used in data compression
Arithmetic coding (AC) is a form of entropy coding used in lossless data compression. Normally, a string of characters is represented using a fixed number
Arithmetic_coding
Image file format with multiple editions
ISBN 978-0-201-60443-6 Pennebaker, William B. and Joan L. Mitchell: JPEG still image data compression standard; 3rd edition, 1993, Springer ISBN 978-0-442-01272-4 Hamilton
JPEG_File_Interchange_Format
TV resolution standard
DCT compression significantly reduces the amount of bandwidth required for a digital TV signal. By 1991, it had achieved data compression ratios from
High-definition_television
3Dc (FourCC : ATI2), also known as DXN, BC5, or Block Compression 5 is a lossy data compression algorithm for normal maps invented and first implemented
3Dc
Motor vehicle
1/min 62.7 kW (84.1 hp) Max. torque 215 N⋅m (159 lb⋅ft) /1300 1/min 227 N⋅m (167 lb⋅ft) /1600 1/min (no data) Compression ratio 6.7:1 16:1 (no data)
Sisu_KB-124
Video compression format, succeeds H.264/MPEG-4 AVC
data compression ratio of up to 1000:1. Depending on the application requirements, HEVC encoders can trade off computational complexity, compression rate
High_Efficiency_Video_Coding
Data storage technologies that use magnetic tape
vendors claiming 2.6:1 or 3:1. The ratio actually obtained depends on the nature of the data so the compression ratio cannot be relied upon when specifying
Magnetic-tape_data_storage
Reduction in gain due to nonlinearity
Gain compression is a reduction in differential or slope gain caused by nonlinearity of the transfer function of an amplifying device for large-signal
Gain_compression
Process by which soils decrease in volume
proportionality (change in void ratio per order of magnitude change in effective stress) is known as the compression index, given the symbol λ {\displaystyle
Soil_consolidation
Computer graphics algorithm
over the space/quality tradeoff inherent in any lossy compression scheme. With ASTC, the ratio between adjacent bit rates is of the order of 25%, making
Adaptive scalable texture compression
Adaptive_scalable_texture_compression
Russian software engineer (born 1972)
of data compression and file management. In 1993, Roshal developed the RAR (Roshal Archive) file format, designed to offer higher compression ratios compared
Eugene_Roshal
File format
2000 but with a focus on speed over compression ratio.[citation needed] PGF can operate at higher compression ratios without taking more encoding/decoding
Progressive_Graphics_File
Magnetic tape storage format
compression ratio) Up to 10.0 GB on one 112 m data cartridge (assuming 2:1 compression ratio) 1994—EXB-8505XL Half-height form factor 500 kB/s data transfer
Data8
{\displaystyle b_{u}=k+1} bits. Then relative space saving s (see Data compression ratio) of the encoding can be defined as s = 1 − b e b u = 1 − p k + (
Truncated_binary_encoding
Form of lossless data compression
lossless data compression in which runs of data (consecutive occurrences of the same data value) are stored as a single occurrence of that data value and
Run-length_encoding
Compression method for digital images
file downloads fractal compression becomes more competitive. At common compression ratios, up to about 50:1, fractal compression provides similar results
Fractal_compression
Image compression algorithm
faster than the original lossless JPEG codec and achieves a similar compression ratio. It was invented by Paul G. Howard and Jeffrey S. Vitter of the Department
FELICS
Lossless data compression algorithm
Dynamic Markov compression (DMC) is a lossless data compression algorithm developed by Gordon Cormack and Nigel Horspool. It uses predictive arithmetic
Dynamic_Markov_compression
Data compression technique
Prediction by partial matching (PPM) is an adaptive statistical data compression technique based on context modeling and prediction. PPM models use a set
Prediction by partial matching
Prediction_by_partial_matching
Audio cassette format developed by Sony
gigabytes per tape. Due to overhead and variable data compression ratios, the actual amount of data stored could be significantly below a gigabyte. Digital
NT_(cassette)
Techniques for lossy compression of neural networks
The SqueezeNet paper reported that Deep Compression achieved a compression ratio of 35 on AlexNet, and a ratio of ~10 on SqueezeNets. Zhou, Luping (2019)
Model_compression
Lossless data compression software
from 2016 shows that xz has the highest compression ratio among lz4, zstd, and zlib, and the slowest compression/decompression. The author of lzip claims
XZ_Utils
American 1940s aircraft engine
Baseline engine model, producing 175 hp (130 kW) at 2300 rpm, with a compression ratio of 6.25:1, a dry weight of 347 lb (157 kg) and fitted with a Marvel
Lycoming_O-435
Data compression improvement algorithm
data compression in DCT-based encoding methods. It is used to optimize residual DCT coefficients after motion estimation in lossy video compression encoders
Trellis_quantization
Message encoded with more bits than needed
maximum possible data compression ratio, when expressed as the percentage by which a file size can be decreased. (When expressed as a ratio of original file
Redundancy (information theory)
Redundancy_(information_theory)
Height/width proportion of an image
35 mm original silent film ratio, today commonly known in TV and video as 1.33:1. Also standard ratio for MPEG-2 video compression. This format is still used
Aspect_ratio_(image)
Mathematical technique used in data compression and analysis
Wavelet compression is a form of data compression well suited for image compression (sometimes also video compression and audio compression). Notable
Wavelet_transform
File format and file compression program
a single file using the bzip2 file format. libbzip2 is a lossless data compression software library used by the bzip2 program. bzip2 is not a file archiver
Bzip2
Video compression method for HDMI and DisplayPort links
on 1 August 2014. The DSC standard supports up to a 3∶1 compression ratio (reducing the data stream to 8 bits per pixel) with constant or variable bit
Display_Stream_Compression
Relationship between two numbers of the same kind
technological areas where ratio comparisons are important, such as aspect ratios (imaging), compression ratios (engines or data storage), etc. Weisstein
Ratio
Digital video coder/decoder
efficient data compression. Different codecs use different chroma subsampling ratios as appropriate to their compression needs. Video compression schemes
Video_codec
Lossless data compression format
squish.dll) together with a command-line tool. SQUISH trades speed for compression ratio: on a 315 MB combined standard-corpus benchmark it produces smaller
SQUISH
File archiver and data compression utility
achieve a very high compression ratio. It has ten levels of compression, from very weak to maximum. However, at higher compression levels, the time required
KGB_Archiver
HTTP Server, Apache v2.0 and later. It is based on Deflate lossless data compression algorithm that uses a combination of the LZ77 algorithm and Huffman
Mod_deflate
In data compression and the theory of formal languages, the smallest grammar problem is the problem of finding the smallest context-free grammar that generates
Smallest_grammar_problem
Texture compression algorithm
image data. All convert a 4×4 block of pixels to a 64-bit or 128-bit quantity, resulting in compression ratios of 6:1 with 24-bit RGB input data or 4:1
S3_Texture_Compression
Technique used to encode voices in telephony
quantization step, to allow further reduction of the required data bandwidth for a given signal-to-noise ratio. Typically, the adaptation to signal statistics in
Adaptive differential pulse-code modulation
Adaptive_differential_pulse-code_modulation
Engine series from Toyota
intake and exhaust camshafts. Very high compression-moderated Atkinson cycle engine. Longer stroke to bore ratio (under-square design). Change of port end
Toyota_Dynamic_Force_engine
Compression shell command based on the LZW compression algorithm
decompression, and has a significantly lower compression ratio. 1.8 MiB of memory is used to compress the Hutter Prize data, slightly more than gzip at its slowest
Compress_(software)
Series of tape drives and data storage media formats by IBM
uncompressed. IBM advertising suggested an expected typical 3:1 data compression ratio. The IBM 3570 product line included three types of tape systems:
IBM_Magstar_MP_3570
Loseless compression algorithm
LZFSE (Lempel–Ziv Finite State Entropy) is an open source lossless data compression algorithm created by Apple Inc. It was released with a simpler algorithm
LZFSE
Family of archive file formats used by 7-Zip
architecture that allows any compression, conversion, or encryption method to be stacked. High compression ratios (depending on the compression method used). AES-256
7z
Magnetic tape data storage technology
for data sharing and safe-keeping, like LTFS, WORM, encryption and data compression. Half-inch (12.65 mm) wide magnetic tape has been used for data storage
Linear_Tape-Open
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