{"id":512,"date":"2020-12-13T17:55:15","date_gmt":"2020-12-13T17:55:15","guid":{"rendered":"http:\/\/med-space.org\/youssef-zaz-master\/?page_id=512"},"modified":"2020-12-13T18:09:27","modified_gmt":"2020-12-13T18:09:27","slug":"outils-mesure","status":"publish","type":"page","link":"https:\/\/yzaz.net\/master\/outils-mesure\/","title":{"rendered":"Outils de mesure et d&#8217;\u00e9valuation"},"content":{"rendered":"<p>Pour \u00e9valuer la qualit\u00e9 d\u2019un traitement comme par exemple la compression avec perte ou la mesure de la d\u00e9gradation de l&#8217;image , on utilise:<br \/>\nl&#8217;Erreur Quadratique Moyenne (<em>Mean Square Error<\/em>)<\/p>\n<div><span class=\"katex-eq\" data-katex-display=\"false\">\n\nMSE=\\frac{1}{N} *\\sum\\limits _{i,j}(( I( i,j) -I&#039;( i,j\\ ))^{2}\n\n<\/span><\/div>\n<p>Le Rapport Signal\/Bruit (<em>Signal to Noise Ratio<\/em>)<\/p>\n<div><span class=\"katex-eq\" data-katex-display=\"false\">\n\nSNR=10log_{10}\\left(\\frac{V}{MSE}\\right) \\ \\ \\ \\ \\ \\ \\ avec\\ \\ \\ \\ \\ \\ V=\\frac{1}{N}\\sum _{i,j} I( i,j)^{2}\n\n<\/span><\/div>\n<p>Le Rapport Signal sur Bruit de cr\u00eate (Peak Signal To Noise Ratio)<\/p>\n<div><span class=\"katex-eq\" data-katex-display=\"false\">\n\nPSNR=10log_{10}\\left(\\frac{max( I)^{2}}{MSE}\\right)\n\n<\/span><\/div>\n<p>PSNR est dans l&#8217;intervale [30, 40]db pour des images de bonne qualit\u00e9.<\/p>\n","protected":false},"excerpt":{"rendered":"<div class=\"mh-excerpt\"><p>Pour \u00e9valuer la qualit\u00e9 d\u2019un traitement comme par exemple la compression avec perte ou la mesure de la d\u00e9gradation de l&#8217;image , on utilise: l&#8217;Erreur <a class=\"mh-excerpt-more\" href=\"https:\/\/yzaz.net\/master\/outils-mesure\/\" title=\"Outils de mesure et d&#8217;\u00e9valuation\">[&#8230;]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":32,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"_links":{"self":[{"href":"https:\/\/yzaz.net\/master\/wp-json\/wp\/v2\/pages\/512"}],"collection":[{"href":"https:\/\/yzaz.net\/master\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/yzaz.net\/master\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/yzaz.net\/master\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yzaz.net\/master\/wp-json\/wp\/v2\/comments?post=512"}],"version-history":[{"count":1,"href":"https:\/\/yzaz.net\/master\/wp-json\/wp\/v2\/pages\/512\/revisions"}],"predecessor-version":[{"id":513,"href":"https:\/\/yzaz.net\/master\/wp-json\/wp\/v2\/pages\/512\/revisions\/513"}],"wp:attachment":[{"href":"https:\/\/yzaz.net\/master\/wp-json\/wp\/v2\/media?parent=512"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}