{"id":54788,"date":"2020-01-04T00:00:00","date_gmt":"2020-01-03T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/jpeg-algoritm-szhatiya"},"modified":"2020-02-18T14:02:50","modified_gmt":"2020-02-18T11:02:50","slug":"jpeg-algoritm-szhatiya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/administrirovanie\/jpeg-algoritm-szhatiya","title":{"rendered":"JPEG. Algoritmo de compress\u00e3o","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ol\u00e1 novamente! Encontrei este artigo, escrito em maio de 2019. Este \u00e9 um continua\u00e7\u00e3o da s\u00e9rie de artigos sobre WAVE e JPEG, Aqui <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450774\/\">primeiro<\/a><\/noindex>. Esta publica\u00e7\u00e3o incluir\u00e1 informa\u00e7\u00f5es sobre o algoritmo de codifica\u00e7\u00e3o de imagens e sobre o formato em si.<\/p>\n<p><\/p>\n<h3 id=\"schepotku-istorii\">Uma pitada de hist\u00f3ria<\/h3>\n<p><\/p>\n<p>Uma colherada de artigo da Wikip\u00e9dia:<\/p>\n<p><\/p>\n<blockquote><p>JPEG (Joint Photographic Experts Group) \u00e9 um dos formatos gr\u00e1ficos rasterizados mais populares, utilizado para armazenar fotos e imagens semelhantes.<\/p><\/blockquote>\n<p>Esse padr\u00e3o foi desenvolvido pelo Grupo Conjunto de Especialistas em Fotografia ainda em 1991, para compress\u00e3o eficiente de imagens.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3 id=\"kakoy-put-prohodyat-izobrazheniya-ot-syrogo-vida-do-jpeg\">Qual \u00e9 o caminho que as imagens percorrem desde a forma bruta at\u00e9 o JPEG<\/h3>\n<p><\/p>\n<p>Alguns acreditam que as imagens JPEG s\u00e3o dados brutos comprimidos pelo m\u00e9todo Huffman, mas n\u00e3o \u00e9 bem assim. Antes da compress\u00e3o, os dados passam por um longo caminho.<\/p>\n<p><\/p>\n<p>Primeiro, o modelo de cores \u00e9 alterado de RGB para YCbCr. Para isso, existe at\u00e9 mesmo um algoritmo especial \u2014 <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/YCbCr#%D0%9F%D1%80%D0%B5%D0%BE%D0%B1%D1%80%D0%B0%D0%B7%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D1%8F_%D0%BF%D0%BE_%D1%80%D0%B5%D0%BA%D0%BE%D0%BC%D0%B5%D0%BD%D0%B4%D0%B0%D1%86%D0%B8%D0%B8_ITU-R_BT.601\">aqui<\/a><\/noindex>. O Y n\u00e3o \u00e9 tocado, pois \u00e9 respons\u00e1vel pela luminosidade, e sua altera\u00e7\u00e3o ser\u00e1 percebida.<\/p>\n<p><\/p>\n<p>A primeira coisa que se faz com a imagem \u00e9 <strong>\u00abredu\u00e7\u00e3o\u00bb<\/strong> (subsampling). \u00c9 f\u00e1cil de entender: pega-se uma matriz de pixels 2x2, em seguida, pegam-se Cb e Cr \u2014 os valores m\u00e9dios de cada um dos componentes YCbCr desses 4 pixels. Assim, <em>ganhamos 6 bytes<\/em>, em vez de 4 Y, 4 Cb, 4 Cr, recebemos 4 Y e os mesmos Cb e Cr para cada um deles (4 + 4 + 4 = 12; 4 + 1 + 1 = 6; 12 \u2014 6 = 6). Em uma escala mesmo 2x2, uma compress\u00e3o com perda com taxa de compress\u00e3o de 2:1 soa s\u00f3lida. Isso se aplica a toda a imagem. E assim \u2014 reduzimos metade do tamanho. Essa t\u00e9cnica pode ser utilizada gra\u00e7as \u00e0 nossa percep\u00e7\u00e3o de cores. Uma pessoa nota facilmente a diferen\u00e7a de brilho, mas n\u00e3o de cor, se a m\u00e9dia estiver em um pequeno bloco de pixels. A redu\u00e7\u00e3o tamb\u00e9m pode ser feita em linha, 4 pixels na horizontal e na vertical. A primeira op\u00e7\u00e3o \u00e9 a mais utilizada. Se a qualidade da imagem for importante, a redu\u00e7\u00e3o n\u00e3o \u00e9 realizada.<br \/>\nUma ilustra\u00e7\u00e3o clara da subamostragem (Habr n\u00e3o permitiu inserir o gif) \u2014 <noindex><a rel=\"nofollow\" href=\"https:\/\/i.ibb.co\/Rg5Th9H\/150953010617579181.gif\">https:\/\/i.ibb.co\/Rg5Th9H\/150953010617579181.gif<\/a><\/noindex><\/p>\n<p><\/p>\n<h5 id=\"osnovnaya-chast-podgotovki\">A parte principal da prepara\u00e7\u00e3o<\/h5>\n<p>\nDCT<\/p>\n<p>Agora a parte mais dif\u00edcil e necess\u00e1ria. A imagem inteira \u00e9 dividida em blocos de 8x8 (usando preenchimento caso a resolu\u00e7\u00e3o n\u00e3o seja m\u00faltipla do lado do bloco).<\/p>\n<p><\/p>\n<p>Agora, aplica-se <strong>DCT (Transformada Discreta de Cosseno) a cada bloco.<\/strong>. Nesta parte da imagem, tudo o que \u00e9 sup\u00e9rfluo \u00e9 removido. Usando DCT, \u00e9 necess\u00e1rio entender se este bloco (8x8) descreve alguma parte mon\u00f3tona da imagem: c\u00e9u, paredes; ou cont\u00e9m estrutura complexa (cabelos, s\u00edmbolos etc.). \u00c9 l\u00f3gico que 64 pixels semelhantes em cor podem ser descritos por apenas 1, uma vez que o tamanho do bloco j\u00e1 \u00e9 conhecido. A\u00ed est\u00e1 a compress\u00e3o: 64 para 1.<\/p>\n<p><\/p>\n<p>A DCT transforma o bloco em um espectro, e onde os valores mudam abruptamente, o coeficiente se torna positivo, e quanto mais brusca a transi\u00e7\u00e3o, maior ser\u00e1 a sa\u00edda. Onde o coeficiente \u00e9 mais alto, a imagem apresenta transi\u00e7\u00f5es n\u00edtidas em cor e luminosidade; onde \u00e9 mais baixo, mudan\u00e7as suaves nas magnitudes dos componentes YCbCr no bloco.<\/p>\n<p>\nQuantiza\u00e7\u00e3o<\/p>\n<p>Agora s\u00e3o aplicadas as configura\u00e7\u00f5es de compress\u00e3o. Cada um dos coeficientes em cada uma das matrizes 8x8 \u00e9 dividido por um n\u00famero espec\u00edfico. Se a qualidade da imagem ap\u00f3s todas as suas modifica\u00e7\u00f5es n\u00e3o for mais diminu\u00edda, o divisor deve ser um. Se voc\u00ea valoriza mais a mem\u00f3ria ocupada por essa fotografia, o divisor ser\u00e1 maior que 1, e a quociente \u00e9 arredondado. Assim, acontece que ap\u00f3s o arredondamento, frequentemente resulta em muitos zeros.<\/p>\n<p><\/p>\n<p>A quantiza\u00e7\u00e3o \u00e9 feita para permitir uma compress\u00e3o ainda maior. Aqui est\u00e1 como fica com a quantiza\u00e7\u00e3o do gr\u00e1fico y = sin(x):<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"JPEG. Algoritmo de compress\u00e3o\" src=\"\/wp-content\/uploads\/2020\/01\/ab6c205c62133785b19b5f42db109fa6.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>\nCompress\u00e3o<\/p>\n<p>Primeiro, passamos pela matriz em zigue-zague:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"JPEG. Algoritmo de compress\u00e3o\" src=\"\/wp-content\/uploads\/2020\/01\/576a5e65431d38742efe42ead0e3863b.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Obtemos um array unidimensional com n\u00fameros. Vemos que h\u00e1 muitos zeros nele, que podem ser removidos. Para isso, em vez de uma sequ\u00eancia de muitos zeros, escrevemos 1 zero e, depois dele, o n\u00famero que indica a quantidade na sequ\u00eancia. Assim, pode-se reduzir at\u00e9 1\/3 do tamanho total do array. E ent\u00e3o, esse array \u00e9 simplesmente comprimido pelo m\u00e9todo de Huffman e inserido no pr\u00f3prio arquivo.<\/p>\n<p><\/p>\n<h3 id=\"gde-ispolzuetsya\">Onde \u00e9 utilizado<\/h3>\n<p><\/p>\n<p>Em toda parte. Assim como o PNG, o JPEG \u00e9 utilizado em c\u00e2meras fotogr\u00e1ficas, sistemas operacionais (como logotipos de empresas, \u00edcones de aplicativos, miniaturas) e em todas as \u00e1reas onde \u00e9 necess\u00e1rio armazenar imagens de forma eficaz.<\/p>\n<p><\/p>\n<h3 id=\"vyvod\">Sa\u00edda<\/h3>\n<p><\/p>\n<p>Atualmente, o conhecimento sobre JPEG \u00e9 valioso apenas para fins educacionais, pois j\u00e1 est\u00e1 embutido e otimizado em muitos lugares por grandes grupos de pessoas, mas a pedra da ci\u00eancia ainda \u00e9 atraente.<\/p>\n<p>\nFontes<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/YCbCr\">Artigo sobre YCbCr na Wikipedia<\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/JPEG\">Artigo sobre JPEG na Wikipedia<\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/pikabu.ru\/story\/kak_ustroen_format_jpeg_5452388\">Um pouco sobre DCT de um post no Pikabu<\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%94%D0%B8%D1%81%D0%BA%D1%80%D0%B5%D1%82%D0%BD%D0%BE%D0%B5_%D0%BA%D0%BE%D1%81%D0%B8%D0%BD%D1%83%D1%81%D0%BD%D0%BE%D0%B5_%D0%BF%D1%80%D0%B5%D0%BE%D0%B1%D1%80%D0%B0%D0%B7%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D0%B5\">Artigo sobre DCT na Wikipedia<\/a><\/noindex><\/p>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/482728\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418 \u0441\u043d\u043e\u0432\u0430 \u0437\u0434\u0440\u0430\u0432\u0441\u0442\u0432\u0443\u0439\u0442\u0435! \u042f \u043d\u0430\u0448\u0435\u043b \u044d\u0442\u0443 \u0441\u0442\u0430\u0442\u044c\u044e, \u043d\u0430\u043f\u0438\u0441\u0430\u043d\u043d\u0443\u044e \u0435\u0449\u0435 \u043c\u0430\u0435 2019-\u043e\u0433\u043e \u0433\u043e\u0434\u0430. \u042d\u0442\u043e \u2014 \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0435\u043d\u0438\u0435 \u0441\u0435\u0440\u0438\u0438 \u0441\u0442\u0430\u0442\u0435\u0439 \u043e WAVE \u0438 JPEG, \u0412\u043e\u0442 \u043f\u0435\u0440\u0432\u0430\u044f. \u042d\u0442\u0430 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u044f \u0432\u043a\u043b\u044e\u0447\u0438\u0442 \u0432 \u0441\u0435\u0431\u0435 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u043e\u0431 \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u0435 \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0438\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0439 \u0438 \u043e \u0441\u0430\u043c\u043e\u043c \u0444\u043e\u0440\u043c\u0430\u0442\u0435 \u0432 \u0446\u0435\u043b\u043e\u043c. \u0429\u0435\u043f\u043e\u0442\u043a\u0443 \u0438\u0441\u0442\u043e\u0440\u0438\u0438 \u0421\u0442\u043e\u043b\u043e\u0432\u0443\u044e \u043b\u043e\u0436\u043a\u0443 \u0441\u0442\u0430\u0442\u044c\u0438 \u0438\u0437 \u0412\u0438\u043a\u0438\u043f\u0435\u0434\u0438\u0438: JPEG (Joint Photographic Experts Group) \u2014 \u043e\u0434\u0438\u043d \u0438\u0437 \u043f\u043e\u043f\u0443\u043b\u044f\u0440\u043d\u044b\u0445 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-54788","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0418 \u0441\u043d\u043e\u0432\u0430 \u0437\u0434\u0440\u0430\u0432\u0441\u0442\u0432\u0443\u0439\u0442\u0435! 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