{"id":7608,"date":"2011-10-25T09:53:10","date_gmt":"2011-10-25T07:53:10","guid":{"rendered":"https:\/\/www.adimec.com\/?p=7608"},"modified":"2018-07-27T17:13:09","modified_gmt":"2018-07-27T15:13:09","slug":"how-to-measure-the-fixed-pattern-noise-in-dark-or-dsnu-repost-from-harvest-imaging","status":"publish","type":"post","link":"https:\/\/www.adimec.com\/ja\/how-to-measure-the-fixed-pattern-noise-in-dark-or-dsnu-repost-from-harvest-imaging\/","title":{"rendered":"How to Measure the Fixed-Pattern Noise in Dark or DSNU: Repost from Harvest Imaging"},"content":{"rendered":"<p>Last week, we wrote about the differences between the camera and the image sensor and\u00a0<a title=\"what camera manufacturers can do to improve image quality\" href=\"http:\/\/info.adimec.com\/blogposts\/bid\/70086\/Image-Sensors-vs-Cameras-how-does-camera-technology-make-a-better-picture\" target=\"_blank\" rel=\"noopener\">what camera manufacturers can do to improve image quality<\/a>.\u00a0 We have also talked about\u00a0<a title=\"compensating for artifacts in the sensor\" href=\"http:\/\/info.adimec.com\/blogposts\/bid\/43199\/Flat-field-correction-improves-machine-vision-camera-uniformity\" target=\"_blank\" rel=\"noopener\">compensating for artifacts in the sensor<\/a>.\u00a0\u00a0<a title=\"Fixed-pattern noise\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fixed-pattern_noise\" target=\"_blank\" rel=\"noopener\">Fixed-pattern noise<\/a>\u00a0is one such sensor imperfection which refers to the non-uniformity between pixels.\u00a0 It can be described by two parameters\u00a0<strong>DSNU<\/strong>\u00a0(dark signal non-uniformity) and\u00a0<strong>PRNU<\/strong>\u00a0(photo response non-uniformity).<\/p>\n<p>&nbsp;<\/p>\n<p><a title=\"Albert Theuwissen\" href=\"http:\/\/www.harvestimaging.com\/bio.php\" target=\"_blank\" rel=\"noopener\">Albert Theuwissen<\/a>\u00a0of\u00a0<a title=\"Harvest Imaging\" href=\"http:\/\/www.harvestimaging.com\/\" target=\"_blank\" rel=\"noopener\">Harvest Imaging<\/a>\u00a0has prepared some excellent blogs on how to measure Fixed Pattern Noise in Dark or DSNU in order to properly do the analysis yourself if you choose.\u00a0 It may also give you an appreciation for what is understood and corrected with in-camera flat field correction.<\/p>\n<p>How to Measure the Fixed-Pattern Noise in Dark or DSNU (1):\u00a0\u00a0<a title=\"http:\/\/harvestimaging.com\/blog\/?p=814\" href=\"http:\/\/harvestimaging.com\/blog\/?p=814\" target=\"_blank\" rel=\"noopener\">http:\/\/harvestimaging.com\/blog\/?p=814<\/a><\/p>\n<p>How to Measure the Fixed-Pattern Noise in Dark or DSNU (2):\u00a0\u00a0<a title=\"http:\/\/harvestimaging.com\/blog\/?p=838\" href=\"http:\/\/harvestimaging.com\/blog\/?p=838\" target=\"_blank\" rel=\"noopener\">http:\/\/harvestimaging.com\/blog\/?p=838<\/a><\/p>\n<p>And another good reference:<\/p>\n<p>How to Measure the Average Dark Signal:\u00a0\u00a0<a title=\"http:\/\/harvestimaging.com\/blog\/?p=795\" href=\"http:\/\/harvestimaging.com\/blog\/?p=795\" target=\"_blank\" rel=\"noopener\">http:\/\/harvestimaging.com\/blog\/?p=795<\/a><\/p>\n<p>&nbsp;<\/p>\n<p>We look forward to more great blogs like this in Albert\u2019s How to Measure series.<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/www.adimec.com\/machine-vision-camera-comparison-epaper-landing-page\/\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" id=\"img-1319551977795\" class=\"alignnone\" src=\"\/\/cdn2.hubspot.net\/hub\/20421\/file-13402917-png\/images\/how-to-compare-cameras1.png\" alt=\"describe the image\" width=\"700\" height=\"128\" border=\"0\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Last week, we wrote about the differences between the camera and the image sensor and\u00a0what camera manufacturer&hellip;<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-7608","post","type-post","status-publish","format-standard","hentry","category-uncategorized","category-1","description-off"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3 - 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