{"id":1347,"date":"2020-05-30T00:12:54","date_gmt":"2020-05-30T00:12:54","guid":{"rendered":"http:\/\/mp4gain.com\/mp4gain\/?p=1347"},"modified":"2020-05-30T00:12:54","modified_gmt":"2020-05-30T00:12:54","slug":"data-compression-lossless-and-lossy","status":"publish","type":"post","link":"https:\/\/mp4gain.com\/mp4gain\/data-compression-lossless-and-lossy\/","title":{"rendered":"Data compression: lossless and lossy"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mp4gain.com\/mp4gain\/data-compression-lossless-and-lossy\/#Data_compression_lossless_and_lossy\" >Data compression: lossless and lossy<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mp4gain.com\/mp4gain\/data-compression-lossless-and-lossy\/#Compression_techniques_fall_into_two_main_categories\" >Compression techniques fall into two main categories:<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mp4gain.com\/mp4gain\/data-compression-lossless-and-lossy\/#lossless_compression_lossless\" >lossless compression (lossless):<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mp4gain.com\/mp4gain\/data-compression-lossless-and-lossy\/#lossy_compression_loss\" >lossy compression (loss)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mp4gain.com\/mp4gain\/data-compression-lossless-and-lossy\/#Lossless_compression_algorithms\" >Lossless compression algorithms<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mp4gain.com\/mp4gain\/data-compression-lossless-and-lossy\/#statistical_compression\" >statistical compression;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mp4gain.com\/mp4gain\/data-compression-lossless-and-lossy\/#replacement_compression\" >replacement compression<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"Data_compression_lossless_and_lossy\"><\/span>Data compression: lossless and lossy<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In computer science and telecommunications, the term data compression (data compression) will indicate the data processing techniques that allow the reduction of the quantity of bits necessary for the representation of the information in digital form. In practice, for example, data compression makes it possible to reduce the number of bits required for the transmission of a video transmission, allowing it to be viewed on the Internet even in the presence of a connection that is not fast enough.<\/p>\n<p><a href=\"http:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2020\/05\/resolution.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1324\" src=\"http:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2020\/05\/resolution.png\" alt=\"losseless compression\" width=\"679\" height=\"275\" srcset=\"https:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2020\/05\/resolution.png 679w, https:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2020\/05\/resolution-300x122.png 300w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px\" \/><\/a><\/p>\n<p>For files, data compression allows you to reduce the size (number of bits) of the file &#8211; this is advantageous because it reduces the space occupied by the file on disk and allows you to transfer the file more quickly (for example, by email).<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Compression_techniques_fall_into_two_main_categories\"><\/span>Compression techniques fall into two main categories:<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"lossless_compression_lossless\"><\/span>lossless compression (lossless):<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>in this case it is possible to rebuild the file from the compressed without loss of information;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"lossy_compression_loss\"><\/span>lossy compression (loss)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>compression occurs to the detriment of information quality, for example, through loss of image definition or sound quality of an audio file; in this case it is not possible to rebuild the file from the compressed file before compression.<\/p>\n<p><a href=\"http:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2020\/05\/how-mp3-works.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1215\" src=\"http:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2020\/05\/how-mp3-works.gif\" alt=\"how mp3 works\" width=\"400\" height=\"300\" \/><\/a><a href=\"http:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2020\/05\/resolution.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1324\" src=\"http:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2020\/05\/resolution.png\" alt=\"losseless compression\" width=\"679\" height=\"275\" srcset=\"https:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2020\/05\/resolution.png 679w, https:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2020\/05\/resolution-300x122.png 300w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px\" \/><\/a><\/p>\n<p>The two techniques are used in different areas. As already mentioned, lossy compression is often applied to images, sounds and videos as it enables significant reductions to be made from the original data, at the price of an often negligible loss in quality. In addition, lossy techniques can be applied during data transmission (runtime), that is, it is not necessary to know all the data to be compressed to apply them: this is obviously an advantage in the transmission of transmissions over the Internet . Among the best known lossless algorithms, we mention jpeg for images and mp3 for audio and mpeg for videos.<\/p>\n<p>In contrast, lossless compression is used when you want to compress text documents, programs, databases, circuit diagrams, etc. and in any case where the loss of the original data is not accepted. The lossless compression category includes .zip and .rar formats, often used to compress files and file folders.<\/p>\n<p>Later we will discuss lossy compression techniques, talking about multimedia formats. Here, instead, we want to deepen the understanding of lossless compression.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Lossless_compression_algorithms\"><\/span>Lossless compression algorithms<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Lossless compression techniques (algorithms) can be divided into two main categories:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"statistical_compression\"><\/span>statistical compression;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h3><span class=\"ez-toc-section\" id=\"replacement_compression\"><\/span>\nreplacement compression<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>.<br \/>\nStatistical compression is based on the input study to be compressed. Statistical studies are carried out on the input format to obtain a good compression. For example, in a text file to compress, the relative frequency of each character is studied and then the shortest code is associated with the character present several times in the text; vice versa, characters present with low frequency are associated with a longer code. Codes like Huffman&#8217;s are part of this class, which we will discuss in the next lesson.<\/p>\n<p>As for substitution compression, this is based on the idea of \u200b\u200breplacing, in a file, all occurrences of repeated strings with pointers to previous copies of the same string. Compression is due to the fact that the length of a pointer is usually less than the length of the string being replaced. As a result, the higher the repetitions of string occurrences in the file to be compressed, the greater the degree of compression achieved.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Data compression: lossless and lossy In computer science and telecommunications, the term data compression (data compression) will indicate the data processing techniques that allow the reduction of the quantity of bits necessary for the representation of the information in digital form. In practice, for example, data compression makes it possible to reduce the number of &hellip; <a href=\"https:\/\/mp4gain.com\/mp4gain\/data-compression-lossless-and-lossy\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Data compression: lossless and lossy&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[33192,33193,33195,33199,33194,33224,33251,33197,33196,33261,33271,33222,27741,33316,33317,33354,33211,33189,33188,33186,6611,33191,33270,33187,33190,33185,33203,33201,33204,33200,33207,33202,33205,33206,33209,33213,33210,33212,33214,33208,33215,33180,33219,33184,33216,33217,33218,33226,33229,33227,33228,33225,33181,33223,27795,33182,33230,33234,33233,33232,33231,27796,27742,33236,33240,33241,33235,33237,33238,33246,33248,33244,33243,33247,33245,33257,33253,33295,33254,33249,33258,33256,33183,33292,33255,33252,33262,33260,33264,33263,33268,33269,33274,33273,33275,33272,33286,33280,33250,33294,33282,33281,33285,33283,33284,33287,33291,33290,33289,33288,33297,33300,33301,33299,33298,33296,33303,33302,33310,33312,33309,33308,33311,33306,33307,33305,33313,33314,33279,33320,33319,33321,33322,33318,33323,33325,33324,33326,33328,33330,33329,33327,33332,33333,33331,33334,33336,33339,33340,33337,33338,33221,33335,33342,33344,33341,33343,33220,33353,33347,33349,33350,33348,33267,33242,33239,33278,33345,33346,33266,33265,33277,33276,33351,33352,33315,33304,33259,33198,33293],"class_list":["post-1347","post","type-post","status-publish","format-standard","hentry","category-audio-video","tag-a-lossy-compression-algorithm","tag-a-lossy-compression-is","tag-a-standard-for-lossy-compression-of-video-and-audio","tag-definition-of-a-lossy-compression","tag-describe-a-lossy-compression","tag-explanation-of-lossy-compression","tag-h-264-compression-lossy","tag-jpeg-is-a-lossy-compression","tag-jpeg-is-a-lossy-compression-technique","tag-jpeg-lossy-compression","tag-kelebihan-lossy-compression","tag-lossless-vs-lossy-data-compression","tag-lossy-and-lossless-compression","tag-lossy-and-lossless-compression-ques10","tag-lossy-and-lossless-compression-quizlet","tag-lossy-and-lossless-compression-video","tag-lossy-compression-choose-three","tag-lossy-compression-adalah","tag-lossy-compression-advantages","tag-lossy-compression-advantages-and-disadvantages","tag-lossy-compression-algorithms","tag-lossy-compression-algorithms-in-multimedia","tag-lossy-compression-also-known-as","tag-lossy-compression-and-lossless-compression","tag-lossy-compression-application","tag-lossy-compression-audio","tag-lossy-compression-bbc","tag-lossy-compression-bbc-bitesize","tag-lossy-compression-benchmark","tag-lossy-compression-benefits","tag-lossy-compression-best","tag-lossy-compression-bitesize","tag-lossy-compression-bitrate","tag-lossy-compression-bits","tag-lossy-compression-can-be-used-for-quizlet","tag-lossy-compression-ccna","tag-lossy-compression-characteristics","tag-lossy-compression-code-org","tag-lossy-compression-codecs","tag-lossy-compression-computer-science","tag-lossy-compression-computer-science-definition","tag-lossy-compression-definition","tag-lossy-compression-definition-bbc-bitesize","tag-lossy-compression-definition-computer","tag-lossy-compression-definition-computer-science","tag-lossy-compression-disadvantages","tag-lossy-compression-disadvantages-is-it-may","tag-lossy-compression-easy-explanation","tag-lossy-compression-effect","tag-lossy-compression-en-espanol","tag-lossy-compression-encryption","tag-lossy-compression-example-text","tag-lossy-compression-examples","tag-lossy-compression-explained","tag-lossy-compression-file-formats","tag-lossy-compression-file-types","tag-lossy-compression-files","tag-lossy-compression-for-embedded-computer-vision-systems","tag-lossy-compression-for-images","tag-lossy-compression-for-photographs-and-video","tag-lossy-compression-for-video","tag-lossy-compression-format","tag-lossy-compression-formats","tag-lossy-compression-gcse","tag-lossy-compression-generation-loss","tag-lossy-compression-german","tag-lossy-compression-gif","tag-lossy-compression-github","tag-lossy-compression-graphic","tag-lossy-compression-h-264","tag-lossy-compression-handbrake","tag-lossy-compression-how-does-it-work","tag-lossy-compression-how-it-works","tag-lossy-compression-how-to-use","tag-lossy-compression-html","tag-lossy-compression-image-formats","tag-lossy-compression-images","tag-lossy-compression-in-computer-network","tag-lossy-compression-in-digital-image-processing","tag-lossy-compression-in-hindi","tag-lossy-compression-in-image-processing","tag-lossy-compression-is","tag-lossy-compression-is-a-compression-technology","tag-lossy-compression-is-not-suitable-for-executable-files","tag-lossy-compression-is-used-for","tag-lossy-compression-is-used-to-quizlet","tag-lossy-compression-javascript","tag-lossy-compression-jpeg","tag-lossy-compression-jpeg-quality","tag-lossy-compression-js","tag-lossy-compression-knee","tag-lossy-compression-ks3","tag-lossy-compression-level","tag-lossy-compression-level-citrix","tag-lossy-compression-limits","tag-lossy-compression-linux","tag-lossy-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