{"id":9038,"date":"2010-06-17T18:45:37","date_gmt":"2010-06-17T18:45:37","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/denoising-sur-m42\/"},"modified":"2025-06-08T22:47:44","modified_gmt":"2025-06-08T20:47:44","slug":"denoising-sur-m42","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/denoising-sur-m42\/","title":{"rendered":"Denoising sur M42"},"content":{"rendered":"<p>Rebonjour,<\/p>\n<p>Toujours dans la cat\u00e9gorie bricolage informatique, voici le r\u00e9sultat d&rsquo;essais de denoising.<\/p>\n<p>Il s&rsquo;agit d&rsquo;une image faite sur base de ~15 captures  \u00e0 1min sur M42 au coucher (du jour et de M42) r\u00e9alis\u00e9es lors d&rsquo;essais au d\u00e9but du printemps.<br \/>\nL&rsquo;image de base a \u00e9t\u00e9 stretch\u00e9e pour d\u00e9br\u00fbler le coeur et laisser de la place aux faibles parties de l&rsquo;objet.<br \/>\nLe bruit domine.<\/p>\n<p>J&rsquo;ai essay\u00e9 quelques tools de denoising. Ils sont g\u00e9n\u00e9ralement efficaces pour enlever le bruit, mais ils ont comme inconv\u00e9nient majeur de r\u00e9duire les d\u00e9tails. Je dirai que leur utilit\u00e9 majeure est de r\u00e9duire le bruit pour des photos classiques faites dans des conditions photographiques donn\u00e9es \u2013 ISOxxx &#8211; qui laissent un bruit relativement uniforme sur toute image 8 bits.<br \/>\nPour les images astro, le bruit est pr\u00e9dominant sur les parties faiblement photonis\u00e9es. Ensuite les images sont moyennement \u00e0 fortement stretch\u00e9es. Ces outils de denoising se montrent peu convaincants. Leur fonction de sharpening associ\u00e9e se montre de faible utilit\u00e9. Il faut dire qu&rsquo;apr\u00e8s un solide filtrage de denoising&#8230;. <\/p>\n<p>J&rsquo;en suis cependant rest\u00e9 \u00e0 Neat Image qui pr\u00e9sente les atouts suivants:<br \/>\n &#8211; Auto profiling efficace du bruit<br \/>\n &#8211; Un (certain) profiling en fonction de la luminosit\u00e9, ce qui est un atout en astro<br \/>\n &#8211; Une possibilit\u00e9 d&rsquo;ajuster des param\u00e8tres dans trois gammes de fr\u00e9quence du bruit. Cette fonctionnalit\u00e9 est disponible aussi pour le sharpening et offre un plus ind\u00e9niable vis \u00e0 vis des softwares concurrents.<\/p>\n<p>Voici quelques r\u00e9sultats.<br \/>\nAlxandre.<\/p>\n<p>Image de base:<br \/>\n<a href=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/13_20100617-20100406_S01_T01_._c.jpg\" data-lbwps-width=\"2350\" data-lbwps-height=\"1567\" data-lbwps-srcsmall=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/13_20100617-20100406_S01_T01_._c-300x200.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium\" src=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/13_20100617-20100406_S01_T01_._c-300x200.jpg\" alt=\"\" width=\"300\" height=\"200\" \/><\/a><\/p>\n<p>Pure Image:<br \/>\n<a href=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/13_20100617-20100406_S01_T02_01PI_._c.jpg\" data-lbwps-width=\"2347\" data-lbwps-height=\"1546\" data-lbwps-srcsmall=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/13_20100617-20100406_S01_T02_01PI_._c-300x198.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium\" src=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/13_20100617-20100406_S01_T02_01PI_._c-300x198.jpg\" alt=\"\" width=\"300\" height=\"198\" \/><\/a><\/p>\n<p>Noise Ware:<br \/>\n<a href=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/13_20100617-20100406_S01_T02_02NW_._c.jpg\" data-lbwps-width=\"2354\" data-lbwps-height=\"1566\" data-lbwps-srcsmall=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/13_20100617-20100406_S01_T02_02NW_._c-300x200.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium\" src=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/13_20100617-20100406_S01_T02_02NW_._c-300x200.jpg\" alt=\"\" width=\"300\" height=\"200\" \/><\/a><\/p>\n<p>Neat Image:<br \/>\n<a href=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/13_20100617-20100406_S01_T02_03NI_._c.jpg\" data-lbwps-width=\"2350\" data-lbwps-height=\"1567\" data-lbwps-srcsmall=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/13_20100617-20100406_S01_T02_03NI_._c-300x200.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium\" src=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/13_20100617-20100406_S01_T02_03NI_._c-300x200.jpg\" alt=\"\" width=\"300\" height=\"200\" \/><\/a><\/p>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;9038&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;0&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;0&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;10&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Veuillez voter&quot;,&quot;legend&quot;:&quot;0\\\/10 - (0 vote)&quot;,&quot;size&quot;:&quot;18&quot;,&quot;title&quot;:&quot;Denoising sur M42&quot;,&quot;width&quot;:&quot;0&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"6\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"7\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"8\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"9\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"10\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 0px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 14.4px;\">\n            <span class=\"kksr-muted\">Veuillez voter<\/span>\n    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Rebonjour, Toujours dans la cat\u00e9gorie bricolage informatique, voici le r\u00e9sultat d&rsquo;essais de denoising. Il s&rsquo;agit d&rsquo;une image faite sur base de ~15 captures \u00e0 1min sur M42 au coucher (du jour et de M42) r\u00e9alis\u00e9es lors d&rsquo;essais au d\u00e9but du printemps. L&rsquo;image de base a \u00e9t\u00e9 stretch\u00e9e pour d\u00e9br\u00fbler le coeur et laisser de la [&hellip;]<\/p>\n","protected":false},"author":16,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[3],"tags":[],"class_list":["post-9038","post","type-post","status-publish","format-standard","hentry","category-astrobricolage"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/9038","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/users\/16"}],"replies":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/comments?post=9038"}],"version-history":[{"count":1,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/9038\/revisions"}],"predecessor-version":[{"id":12644,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/9038\/revisions\/12644"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=9038"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=9038"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=9038"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}