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COMPRESSION
Compression may refer to: Physical science *Compression (physics), size reduction due to forces *Compression member, a structural element such as a column *Compressibility, susceptibility to compression *Gas compression *Compression ratio, of a combustion engine *Compression (geology) *Compression or compressive strength Information science *Data compression, reducing the data required for information *Audio compression (data), reducing the data required for audio *Bandwidth compression *Compression artifact, defect in data due to compression *Image compression, of digital images *Video compression *One-way compression function, a cryptographic primitive *Dynamic range compression, reducing audio dynamic range Medicine *Brain compression, a medical condition * Compression bandage *Pressing on the lower abdominal area in an intravenous pyelogram *Cold compression therapy, for minor injuries Other *Amplifier gain compression, due to nonlinearity *Compression (dance), several techn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Video Compression
In information theory, data compression, source coding, or bit-rate reduction is the process of encoding information using fewer bits than the original representation. Any particular compression is either lossy or lossless. Lossless compression reduces bits by identifying and eliminating statistical redundancy. No information is lost in lossless compression. Lossy compression reduces bits by removing unnecessary or less important information. Typically, a device that performs data compression is referred to as an encoder, and one that performs the reversal of the process (decompression) as a decoder. The process of reducing the size of a data file is often referred to as data compression. In the context of data transmission, it is called source coding; encoding done at the source of the data before it is stored or transmitted. Source coding should not be confused with channel coding, for error detection and correction or line coding, the means for mapping data onto a signal. C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Data Compression
In information theory, data compression, source coding, or bit-rate reduction is the process of encoding information using fewer bits than the original representation. Any particular compression is either lossy or lossless. Lossless compression reduces bits by identifying and eliminating statistical redundancy. No information is lost in lossless compression. Lossy compression reduces bits by removing unnecessary or less important information. Typically, a device that performs data compression is referred to as an encoder, and one that performs the reversal of the process (decompression) as a decoder. The process of reducing the size of a data file is often referred to as data compression. In the context of data transmission, it is called source coding; encoding done at the source of the data before it is stored or transmitted. Source coding should not be confused with channel coding, for error detection and correction or line coding, the means for mapping data onto a signal. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Image Compression
Image compression is a type of data compression applied to digital images, to reduce their cost for storage or transmission. Algorithms may take advantage of visual perception and the statistical properties of image data to provide superior results compared with generic data compression methods which are used for other digital data. Lossy and lossless image compression Image compression may be lossy or lossless. Lossless compression is preferred for archival purposes and often for medical imaging, technical drawings, clip art, or comics. Lossy compression methods, especially when used at low bit rates, introduce compression artifacts. Lossy methods are especially suitable for natural images such as photographs in applications where minor (sometimes imperceptible) loss of fidelity is acceptable to achieve a substantial reduction in bit rate. Lossy compression that produces negligible differences may be called visually lossless. Methods for lossy compression: * Transfor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compression (physics)
In mechanics, compression is the application of balanced inward ("pushing") forces to different points on a material or structure, that is, forces with no net sum or torque directed so as to reduce its size in one or more directions.Ferdinand Pierre Beer, Elwood Russell Johnston, John T. DeWolf (1992), "Mechanics of Materials". (Book) McGraw-Hill Professional, It is contrasted with tension or traction, the application of balanced outward ("pulling") forces; and with shearing forces, directed so as to displace layers of the material parallel to each other. The compressive strength of materials and structures is an important engineering consideration. In uniaxial compression, the forces are directed along one direction only, so that they act towards decreasing the object's length along that direction. The compressive forces may also be applied in multiple directions; for example inwards along the edges of a plate or all over the side surface of a cylinder, so as to reduce it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compression Bandage
A bandage is a piece of material used either to support a medical device such as a dressing or splint, or on its own to provide support to or to restrict the movement of a part of the body. When used with a dressing, the dressing is applied directly on a wound, and a bandage used to hold the dressing in place. Other bandages are used without dressings, such as elastic bandages that are used to reduce swelling or provide support to a sprained ankle. Tight bandages can be used to slow blood flow to an extremity, such as when a leg or arm is bleeding heavily. Bandages are available in a wide range of types, from generic cloth strips to specialized shaped bandages designed for a specific limb or part of the body. Bandages can often be improvised as the situation demands, using clothing, blankets or other material. In American English, the word ''bandage'' is often used to indicate a small gauze dressing attached to an adhesive bandage. Types Gauze bandage (common gauze roller ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compressor (other)
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A compressor is a mechanical device that increases the pressure of a gas by reducing its volume. Compressor may also refer to: * A device that performs Compression (other) * Compressor (audio signal processor), for dynamic range compression * Compressor (software), a video and audio media compression and encoding application See also * * * Compression (other) * Compaction (other) * Decompression (other) * Expansion (other) * Kompressor (other) * Compressor Hot Springs, a place in California, U.S. * Supercharger * Turbocharger In an internal combustion engine, a turbocharger (often called a turbo) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake gas, forcing more air into the engine in order to pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compression Garment
Compression garments are pieces of clothing that fit tightly around the skin. In medical contexts, compression garments provide support for people who have to stand for long periods or have poor circulation. These come in varying degrees of compression, and higher degree compression sleeves, such as sleeves that provide compression of 20–30 mmHg or higher, typically require a doctor's prescription. Compression garments worn on the legs can help prevent deep vein thrombosis and reduce swelling, especially while traveling. Compression can also be used for post surgeries, to help with the healing process. Garment usage varies per patient but can be worn up to a year. There is also second stage compression garments, that are every day wear. In sports, form-fitting compression sportswear, usually made of spandex, is commonly worn by athletes and in exercise to prevent chafing and rashes. Maternity wear A bellyband, wrap, or abdominal binder is a compression garment which resemb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compress
compress is a Unix shell compression program based on the LZW compression algorithm. Compared to more modern compression utilities such as gzip and bzip2, compress performs faster and with less memory usage, at the cost of a significantly lower compression ratio. The uncompress utility will restore files to their original state after they have been compressed using the ''compress'' utility. If no files are specified, the standard input will be uncompressed to the standard output. In the upcoming POSIX and Single Unix Specification revision, it is planned that DEFLATE algorithm used in gzip format be supported in those utilities. Description of program Files compressed by ''compress'' are typically given the extension ".Z" (modeled after the earlier pack program which used the extension ".z"). Most ''tar'' programs will pipe their data through ''compress'' when given the command line option "-Z". (The ''tar'' program in its own does not compress; it just stores multipl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compaction (other)
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Compaction may refer to: * Soil compaction, for mechanically induced compaction near the ground surface * Compaction of ceramic powders * Compaction (geology), part of the process of lithification involving mechanical dewatering of a sediment by progressive loading under several km of geomaterial * Waste compaction, related to garbage * Cold compaction, powder compaction at low temperatures * Data compaction, related to computers ** Curve-fitting compaction * Compactor, a device that performs compaction * Compaction a cellular differentiation process in the early embryo See also * Compact (other) * Compactification (other) * Impaction (other) Impaction may refer to: *Impaction (animals), blockage of the digestive tract of animals *Fecal impaction, the presence of a solid, immobile bulk of human feces that can develop in the rectum * Dental impaction, the failure of teeth fully to erupt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compression (phonetics)
In phonology, syncope (; from grc, , , cutting up) is the loss of one or more sounds from the interior of a word, especially the loss of an unstressed vowel. It is found in both synchronic and diachronic analyses of languages. Its opposite, whereby sounds are added, is epenthesis. Synchronic analysis Synchronic analysis studies linguistic phenomena at one moment of a language's history, usually the present, in contrast to diachronic analysis, which studies a language's states and the patterns of change across a historical timeframe. In modern languages, syncope occurs in inflection, poetry, and informal speech. Inflections In languages such as Irish and Hebrew, the process of inflection can cause syncope: * In some verbs : (to play) should become * (I play). However, the addition of the causes syncope and the second-last syllable vowel is lost so becomes . : (katav), (he) wrote, becomes (katvu), (they) wrote, when the third-person plural ending (-u) is added. * I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compression (functional Analysis)
In functional analysis, the compression of a linear operator ''T'' on a Hilbert space to a subspace ''K'' is the operator :P_K T \vert_K : K \rightarrow K , where P_K : H \rightarrow K is the orthogonal projection onto ''K''. This is a natural way to obtain an operator on ''K'' from an operator on the whole Hilbert space. If ''K'' is an invariant subspace for ''T'', then the compression of ''T'' to ''K'' is the restricted operator ''K→K'' sending ''k'' to ''Tk''. More generally, for a linear operator ''T'' on a Hilbert space H and an isometry ''V'' on a subspace W of H, define the compression of ''T'' to W by :T_W = V^*TV : W \rightarrow W, where V^* is the adjoint of ''V''. If ''T'' is a self-adjoint operator, then the compression T_W is also self-adjoint. When ''V'' is replaced by the inclusion map I: W \to H, V^* = I^*=P_K : H \to W, and we acquire the special definition above. See also * Dilation Dilation (or dilatation) may refer to: Physiology or medicine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compression (dance)
This is a list of dance terms that are not names of dances or types of dances. See List of dances and List of dance style categories for those. This glossary lists terms used in various types of ballroom partner dances, leaving out terms of highly evolved or specialized dance forms, such as ballet, tap dancing, and square dancing, which have their own elaborate terminology. See also: * Glossary of ballet terms * Glossary of dance moves Abbreviations *3T – Three Ts *CBL – Cross-body lead *CBM – Contra body movement *CBMP – Contra body movement position *COG – Center of gravity *CPB – Center point of balance *CPP – Counter promenade position *DC – Diagonally to center *DW – Diagonally to wall *IDSF – International DanceSport Federation *IDTA – International Dance Teachers Association *ISTD – Imperial Society of Teachers of Dancing *J&J – Jack and Jill *LOD – Line of dance *MPM – Measures per minute *NFR – No foot rise *OP – ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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