{"id":273,"date":"2019-09-17T13:06:24","date_gmt":"2019-09-17T13:06:24","guid":{"rendered":"http:\/\/winkoms.eu\/?p=273"},"modified":"2026-10-04T07:54:48","modified_gmt":"2026-10-04T07:54:48","slug":"quina-resolucio-ha-de-tenir-la-camera-digital-del-meu-microscopi","status":"publish","type":"post","link":"https:\/\/winkoms.eu\/ca\/quina-resolucio-ha-de-tenir-la-camera-digital-del-meu-microscopi\/","title":{"rendered":"Quina resoluci\u00f3 ha de tenir la c\u00e0mera digital del meu microscopi?"},"content":{"rendered":"<h6>Font original: <a href=\"http:\/\/www.microscopiaoberta.com\/?p=184&amp;lang=ca\" target=\"_blank\" rel=\"noopener noreferrer\">http:\/\/www.microscopiaoberta.com\/?p=184&amp;lang=ca<\/a><\/h6>\n<hr \/>\n<p><img decoding=\"async\" class=\"alignnone wp-image-264 size-full\" src=\"http:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/DetallFusetY.jpg\" alt=\"\" width=\"1921\" height=\"1225\" srcset=\"https:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/DetallFusetY.jpg 1921w, https:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/DetallFusetY-300x191.jpg 300w, https:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/DetallFusetY-768x490.jpg 768w, https:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/DetallFusetY-1024x653.jpg 1024w\" sizes=\"(max-width: 1921px) 100vw, 1921px\" \/><\/p>\n<p>\u00c9s un cl\u00e0ssic que els nostres clients ens preguntin per c\u00e0meres digitals de \u201cquan m\u00e9s Megap\u00edxels millor\u201d per\u00f2 la realitat \u00e9s que <strong><em>El poder separador\u00a0( A.K.A.\u00a0resoluci\u00f3)\u00a0d\u2019un microscopi\u00a0NO la d\u00f3na la c\u00e0mera\u00a0sin\u00f3\u00a0l\u2019objectiu\u00a0del microscopi<\/em><\/strong><\/p>\n<p>En el mercat existeixen c\u00e0meres de microscopi des de 1 fins a 32 Megap\u00edxels , essent habituals els 5 i 10 Megap\u00edxels, per\u00f2 si el poder separador\/resoluci\u00f3 no la dona la c\u00e0mera llavors <em>quants p\u00edxels s\u00f3n els necessaris per treballar amb microsc\u00f2pia?<\/em><\/p>\n<p><strong>Primer punt \u2013 El poder Separador (A.K.A. Resoluci\u00f3 ) d\u2019un microscopi<\/strong><\/p>\n<p>Per determinar \u00a0p\u00edxels necessitem abans cal que coneguem el\u00a0<strong>poder separador<\/strong>\u00a0dels nostres\u00a0microscopis.<\/p>\n<p>Aquest par\u00e0metre ve determinat principalment por l\u2019Apertura Num\u00e8rica dels nostres objectius i est\u00e0 definit per la seg\u00fcent formula simplificada:<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-524 size-full\" src=\"http:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/image001.png\" alt=\"\" width=\"952\" height=\"567\" srcset=\"https:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/image001.png 952w, https:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/image001-300x179.png 300w, https:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/image001-768x457.png 768w\" sizes=\"(max-width: 952px) 100vw, 952px\" \/><\/p>\n<div style=\"background:#f5f9fc;border-left:4px solid #1a7ba8;padding:12px 18px;margin:14px 0;font-size:0.95em;\"><strong>Nota de l&#8217;editor (2026):<\/strong> 0,61&middot;&lambda;\/NA &eacute;s el <strong>criteri de Rayleigh<\/strong> (dos punts incoherents, caiguda d&#8217;intensitat ~26%) &mdash; el criteri operatiu correcte per a una c&agrave;mera. Difereix del l&iacute;mit de difracci&oacute; d&#8217;Abbe d = &lambda;\/(2&middot;NA) (el l&iacute;mit d&#8217;informaci&oacute;, basat en capturar el primer ordre difractat) per un factor 1,22 (el primer zero de J&#8321;\/&pi;). El l&iacute;mit te&ograve;ric d&#8217;informaci&oacute; &eacute;s, per tant, un ~20% m&eacute;s fi que el valor de Rayleigh usat aqu&iacute;.<\/div>\n<p><strong>Segon punt \u2013 Teorema de Nyquist<\/strong><\/p>\n<p>Tenim ja la resoluci\u00f3 dels nostres objectius, per\u00f2, com es tradueix ara en p\u00edxels?<\/p>\n<p>Per aix\u00f2, utilitzem el Teorema de Nyquist que ens determinar\u00e0 la mida de p\u00edxel ideal per a cadascun dels nostres objectius. Una formula per calcular la mida de\u00a0<strong>p\u00edxel\u00a0IDEAL<\/strong>\u00a0en microsc\u00f2pia \u00e9s:<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-530 size-full\" src=\"http:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/image003.png\" alt=\"\" width=\"940\" height=\"694\" srcset=\"https:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/image003.png 940w, https:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/image003-300x221.png 300w, https:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/image003-768x567.png 768w\" sizes=\"(max-width: 940px) 100vw, 940px\" \/><\/p>\n<div style=\"background:#f5f9fc;border-left:4px solid #1a7ba8;padding:12px 18px;margin:14px 0;font-size:0.95em;\"><strong>Nota de l&#8217;editor (2026):<\/strong> el teorema de Nyquist s&#8217;aplica estrictament a la <strong>freq&uuml;&egrave;ncia de tall &ograve;ptica<\/strong> f<sub>c<\/sub> = 2&middot;NA\/&lambda; (il&middot;luminaci&oacute; incoherent), no al criteri de Rayleigh. El Nyquist estricte exigeix p &le; M&middot;&lambda;\/(4&middot;NA); la f&oacute;rmula de dalt (p = 0,61&middot;&lambda;&middot;M\/(2&middot;NA)) &eacute;s 1,22&times; m&eacute;s laxa &mdash; una regla pr&agrave;ctica conservadora (coincideix amb el pixel calculator de Nikon MicroscopyU), no el teorema en si. Mai recomana submostrejar. A m&eacute;s, complir Nyquist nom&eacute;s garanteix que la informaci&oacute; <em>pot<\/em> transferir-se, no que sigui totalment utilitzable: prop de f<sub>N<\/sub> la MTF &ograve;ptica ja ha caigut, i la MTF del propi p&iacute;xel quadrat val sinc(p&middot;f) = 0,637 en la seva pr&ograve;pia freq&uuml;&egrave;ncia de Nyquist. A la pr&agrave;ctica, 2,5&ndash;3 p&iacute;xels per element resolt &eacute;s un objectiu m&eacute;s segur que 2.<\/div>\n<table style=\"border-collapse:collapse;width:100%;margin:10px 0;font-size:0.9em;\">\n<thead>\n<tr style=\"background:#eef4f8;\">\n<th style=\"border:1px solid #ccd;padding:6px;\">M<\/th>\n<th style=\"border:1px solid #ccd;padding:6px;\">NA<\/th>\n<th style=\"border:1px solid #ccd;padding:6px;\">p ideal, article (&micro;m)<\/th>\n<th style=\"border:1px solid #ccd;padding:6px;\">p Nyquist estricte (&micro;m)<\/th>\n<th style=\"border:1px solid #ccd;padding:6px;\">ratio<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #ccd;padding:6px;\">10<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">0,25<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">6,77<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">5,55<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">1,22<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ccd;padding:6px;\">20<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">0,40<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">8,46<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">6,94<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">1,22<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ccd;padding:6px;\">40<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">0,65<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">10,42<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">8,54<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">1,22<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ccd;padding:6px;\">63<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">0,85<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">12,55<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">10,28<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">1,22<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ccd;padding:6px;\">100<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">1,25<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">13,54<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">11,10<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">1,22<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p><strong>Tercer punt \u2013 Mida Sensor C\u00e0mera<\/strong><\/p>\n<div style=\"background:#fdf2f0;border-left:4px solid #c0392b;padding:14px 20px;margin:16px 0;font-size:0.95em;\"><strong>&#9888; Correcci&oacute; (afegida el 2026):<\/strong> les designacions 1&quot;, 1\/2&quot;, 1\/3&quot;&hellip; s&oacute;n etiquetes &ograve;ptiques hist&ograve;riques heretades dels tubs vidicon &mdash; <strong>no<\/strong> s&oacute;n mesures f&iacute;siques. Si es calcula la mida del sensor com la diagonal literal (25,4 mm per a &quot;1 polzada&quot;), el resultat de megap&iacute;xels m&agrave;xims surt inflat un factor ~2&ndash;2,5&times;:<\/p>\n<table style=\"border-collapse:collapse;width:100%;margin:10px 0;font-size:0.9em;\">\n<thead>\n<tr style=\"background:#f6e7e4;\">\n<th style=\"border:1px solid #ccd;padding:6px;\">Format<\/th>\n<th style=\"border:1px solid #ccd;padding:6px;\">Diagonal literal<\/th>\n<th style=\"border:1px solid #ccd;padding:6px;\">Dimensions reals<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #ccd;padding:6px;\">1&quot;<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">25,4 mm<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">12,8 &times; 9,6 mm (diagonal &asymp; 16 mm)<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ccd;padding:6px;\">1\/2&quot;<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">12,7 mm<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">6,4 &times; 4,8 mm<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ccd;padding:6px;\">1\/3&quot;<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">8,47 mm<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">4,8 &times; 3,6 mm<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ccd;padding:6px;\">1\/2.5&quot;<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">10,16 mm<\/td>\n<td style=\"border:1px solid #ccd;padding:6px;\">5,76 &times; 4,32 mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Cal utilitzar sempre les dimensions f&iacute;siques reals del sensor concret de la c&agrave;mera, no l&#8217;etiqueta en polzades, a l&#8217;hora de calcular els megap&iacute;xels necessaris.<\/p><\/div>\n<p>Ara ja sabem quines dimensions cal que tinguin els nostres p\u00edxels per a resoldre amb m\u00e0xim detall les imatges dels nostres microscopis per\u00f2 ens falta traduir la mida de 1 p\u00edxel a les resolucions que utilitzem amb les nostres c\u00e0meres.<\/p>\n<p>La f\u00f3rmula m\u00e9s simple \u00e9s:<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-533 size-full\" src=\"http:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/image005.png\" alt=\"\" width=\"922\" height=\"617\" srcset=\"https:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/image005.png 922w, https:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/image005-300x201.png 300w, https:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/image005-768x514.png 768w\" sizes=\"(max-width: 922px) 100vw, 922px\" \/><\/p>\n<p>La forma m\u00e9s simple \u00e9s:<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-533 size-full\" src=\"http:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/image005.png\" alt=\"\" width=\"922\" height=\"617\" srcset=\"https:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/image005.png 922w, https:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/image005-300x201.png 300w, https:\/\/winkoms.eu\/wp-content\/uploads\/2019\/09\/image005-768x514.png 768w\" sizes=\"(max-width: 922px) 100vw, 922px\" \/><\/p>\n<p>IMPORTANT! Per sobre del valor MegaP\u00edxels obtingut estarem sobre mostrejant l\u2019imatge i no obtindrem m\u00e9s informaci\u00f3. Per sota del valor perdem informaci\u00f3 i no \u00e9s recomanable en absolut.<\/p>\n<div style=\"background:#f5f9fc;border-left:4px solid #1a7ba8;padding:12px 18px;margin:14px 0;font-size:0.95em;\"><strong>Nota de l&#8217;editor (2026):<\/strong> el sobremostreig no fa perdre informaci&oacute;, i no &eacute;s nom&eacute;s malbaratament &mdash; guanya robustesa de mostreig, apropa les freq&uuml;&egrave;ncies al tall &ograve;ptic, i millora el demosaicing Bayer. Els sensors de microsc&ograve;pia moderns sobremostregen deliberadament. El que costa el sobremostreig &eacute;s relaci&oacute; senyal\/soroll per p&iacute;xel i mida de fitxer, no resoluci&oacute;. Un objectiu pr&agrave;ctic &eacute;s triar un sensor amb un p&iacute;xel entre el Nyquist estricte i ~1,5&times; aquest valor.<\/div>\n","protected":false},"excerpt":{"rendered":"<p>El poder separador\u00a0(A.K.A.\u00a0resoluci\u00f3)\u00a0d\u2019un microscopi\u00a0no la d\u00f3na la c\u00e0mera\u00a0sin\u00f3\u00a0l\u2019objectiu\u00a0del microscopi<\/p>\n","protected":false},"author":1,"featured_media":264,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rs_blank_template":"","rs_page_bg_color":"","slide_template_v7":"","footnotes":""},"categories":[7],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Quina resoluci\u00f3 ha de tenir la c\u00e0mera digital del meu microscopi? - Winkoms<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/winkoms.eu\/ca\/quina-resolucio-ha-de-tenir-la-camera-digital-del-meu-microscopi\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Quina resoluci\u00f3 ha de tenir la c\u00e0mera digital del meu microscopi? 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