{"id":9949,"date":"2017-11-07T21:26:01","date_gmt":"2017-11-07T21:26:01","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/qsi583-quelques-annees-apres\/"},"modified":"2025-06-08T22:45:29","modified_gmt":"2025-06-08T20:45:29","slug":"qsi583-quelques-annees-apres","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/qsi583-quelques-annees-apres\/","title":{"rendered":"QSI583, quelques ann\u00e9es apr\u00e8s"},"content":{"rendered":"

Test rapide de ma QSI583, apr\u00e8s quelques ann\u00e9es.<\/p>\n

Une image de bias, \u00e0 laquelle on retire la moyenne d’un grand nombre de bias, ce qui nous donne une image ne devant contenir que du bruit.
\nUn offset aura \u00e9t\u00e9 appliqu\u00e9 \u00e0 l’image pendant le calcul, pour s’assurer qu’aucun pixel n’ait une valeur n\u00e9gative.<\/p>\n

On applique une FFT, pour voir si cette image de bruit contient des fr\u00e9quences particuli\u00e8res r\u00e9siduelles, repr\u00e9sentative de par exemple banding ou tout autre r\u00e9sidu.<\/p>\n

La FFT de l’image ne donne qu’un point central, montrant qu’il n’y a que du bruit dans l’image, sans pattern r\u00e9siduel.
\n\"\"<\/a><\/p>\n

Un screen stretch de cette FFT montre effectivement un fond uniforme sans concentration particuli\u00e8re, sauf toujours le point central. Il n\u2019y a vraiment que du bruit.
\nExcellent, QSI, m\u00eame apr\u00e8s des ann\u00e9es.
\n\"\"<\/a><\/p>\n

Alexandre<\/p>\n\n\n

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\n Veuillez voter<\/span>\n <\/div>\n <\/div>\n","protected":false},"excerpt":{"rendered":"

Test rapide de ma QSI583, apr\u00e8s quelques ann\u00e9es. Une image de bias, \u00e0 laquelle on retire la moyenne d’un grand nombre de bias, ce qui nous donne une image ne devant contenir que du bruit. Un offset aura \u00e9t\u00e9 appliqu\u00e9 \u00e0 l’image pendant le calcul, pour s’assurer qu’aucun pixel n’ait une valeur n\u00e9gative. On applique […]<\/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-9949","post","type-post","status-publish","format-standard","hentry","category-astrobricolage"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/9949","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=9949"}],"version-history":[{"count":1,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/9949\/revisions"}],"predecessor-version":[{"id":11734,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/9949\/revisions\/11734"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=9949"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=9949"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=9949"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}