{"id":28711,"date":"2018-03-09T09:21:31","date_gmt":"2018-03-09T09:21:31","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/hash-methods-in-natural-image-statistics-and-compression\/"},"modified":"2018-03-09T09:21:31","modified_gmt":"2018-03-09T09:21:31","slug":"hash-methods-in-natural-image-statistics-and-compression","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/hash-methods-in-natural-image-statistics-and-compression\/","title":{"rendered":"Hash methods in natural image statistics and compression"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Kostadin Koroutchev <\/strong><\/h2>\n<p>La tesis trata del uso de la funci\u00f3n hash aproximada aplicada en dos \u00e1reas:  por un lado compresi\u00f3n fractal y codebook y por otro estad\u00edstica de im\u00e1genes naturales.  la primera parte de la tesis trata la compresi\u00f3n fractal y codebook. Estas compresiones tambi\u00e9n sirven para comprobar la existencia de la funci\u00f3n hash en norma l_sup. La existencia de la funci\u00f3n hash aplicable a datos multi-dimensionales, que preserve la vecindad, est\u00e1 lejos de ser trivial y la existencia de la misma se debe a la estad\u00edstica espec\u00edfica de los bloques de las im\u00e1genes naturales.  la aceleraci\u00f3n que proporcione el hash es de unas 5 veces superior que los mejores m\u00e9todos de compresi\u00f3n fractal conocidos.  la segunda parte de la tesis utiliza el m\u00e9todo de aceleraci\u00f3n, desarrollado en la primera parte, para hacer estad\u00edstica de 4&#215;4 bloques de la base de im\u00e1genes naturales de van hatearen.  el resultado es que las partes del c\u00f3digo fractal son muy independientes estad\u00edsticamente, con distribuci\u00f3n trivial del brillo y el perfiel de los bloques.  la mayor parte de la informaci\u00f3n est\u00e1 contenida en el contraste, que puede servir como comprobaci\u00f3n estad\u00edstica de la hip\u00f3tesis de marr del a\u00f1o 1981.  a partir de la evidencia emp\u00edrica, se deriva una formula expl\u00edcita para la probabilidad del bloque.  otro resultado consiste en la evidencia de que no existe algoritmo que pueda hacer este tipo de estad\u00edstica con la misma precisi\u00f3n (30db) con mayor tama\u00f1o de los bloques.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Hash methods in natural image statistics and compression<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Hash methods in natural image statistics and compression <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Kostadin Koroutchev <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Aut\u00f3noma de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 17\/02\/2004<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li> Dorronsoro Ibero Jos\u00e9 Ram\u00f3n<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: gustavo Deco <\/li>\n<li>Antonio Turiel Martinez (vocal)<\/li>\n<li> Martinez sanchez Jos\u00e9 Mar\u00eda (vocal)<\/li>\n<li>Luis Manuel Sarro baro (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Kostadin Koroutchev La tesis trata del uso de la funci\u00f3n hash aproximada aplicada en dos \u00e1reas: por [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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