{"id":1896,"date":"2017-10-13T22:44:50","date_gmt":"2017-10-13T20:44:50","guid":{"rendered":"https:\/\/www.adimec.com\/in-field-calibrations-for-optimal-machine-vision-image-accuracy\/"},"modified":"2018-07-30T11:45:46","modified_gmt":"2018-07-30T09:45:46","slug":"in-field-calibrations-for-optimal-machine-vision-image-accuracy","status":"publish","type":"post","link":"https:\/\/www.adimec.com\/ja\/in-field-calibrations-for-optimal-machine-vision-image-accuracy\/","title":{"rendered":"In-Field Calibrations for Optimal Machine Vision Image Accuracy"},"content":{"rendered":"<div class=\"hs-migrated-cms-post\">\n<p><a href=\"http:\/\/info.adimec.com\/blogposts\/bid\/43199\/Flat-field-correction-improves-machine-vision-camera-uniformity\" title=\"Flat Field Correction (FFC)\" target=\"_blank\">Flat Field Correction (FFC)<\/a>&nbsp;processing can be used to minimize or even remove artifacts to improve the image uniformity.&nbsp; The purpose of flat field correction is to ensure image uniformity regardless of exposure.<\/p>\n<p><!--more--><\/p>\n<p>There are two components to FFC:<\/p>\n<ul>\n<li>Local FFC \u2013 calibration done at the camera manufacturer to compensate for sensor imperfections<\/li>\n<li>Global FFC \u2013 in-field calibrations to address issues in the image acquisition set-up process, such as non-uniformity of lighting source(s) and optics used in setup.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><b>Local FFC<\/b><\/p>\n<p>Local flat field correction can be done as a general offset for the whole image, or on a per pixel basis for better accuracy.&nbsp; For example in the <a href=\"https:\/\/www.adimec.com\/\" title=\"Adimec\" target=\"_blank\">Adimec<\/a> <a href=\"https:\/\/www.adimec.com\/cameras\/machine-vision-cameras\/\" title=\"QUARTZ\" target=\"_blank\">QUARTZ<\/a> series, we apply several corrections including the pixel based FFC while maintaining 4 Megapixels at 180 fps.&nbsp; Because this is done inside the camera, 12 bits rather than 10 bits are used for <a href=\"http:\/\/info.adimec.com\/blogposts\/bid\/70923\/Advantages-of-in-camera-image-processing-How-camera-technology-makes-a-better-picture-part-2\" title=\"image processing for better accuracy.\" target=\"_blank\">image processing for better accuracy.<\/a><\/p>\n<p>&nbsp;<\/p>\n<p><b>Global FFC<\/b><\/p>\n<p>Some machine vision cameras contain algorithms for in-field FFC through storage of multiple calibration setups so the camera can switch instantly during operation between different lighting-optics, optical filters and other setups. &nbsp;<\/p>\n<p>We recently <a href=\"https:\/\/www.adimec.com\/en\/Service_Menu\/News?listciid=3434\" title=\"upgraded the QUARTZ series\" target=\"_blank\">upgraded the QUARTZ series<\/a> to allow for the storage of even more flat field correction sets (40 sets for 4 Megapixels).&nbsp; This feature is especially beneficial when the lenses or lighting is changed within measurements.<\/p>\n<p>&nbsp;<\/p>\n<table border=\"0\">\n<tbody>\n<tr>\n<td>\n<h4><img decoding=\"async\" id=\"img-1349943018463\" src=\"\/\/cdn2.hubspot.net\/hub\/20421\/file-13402840-gif\/images\/ffc-off.gif\" border=\"0\" alt=\"describe the image\" \/><\/h4>\n<h4><strong>Figure 1.&nbsp; Image from a CMOS camera without Flat&nbsp;<\/strong><strong>field correction<\/strong><\/h4>\n<\/td>\n<td>\n<h4><a href=\"https:\/\/www.adimec.com\/cameras\/machine-vision-cameras\/quartz-series\/\" target=\"_blank\"><img decoding=\"async\" id=\"img-1349942724642\" src=\"\/\/cdn2.hubspot.net\/hub\/20421\/file-13402844-gif\/images\/ffc-on.gif\" border=\"0\" alt=\"describe the image\" \/><\/a><\/h4>\n<h4><strong>Figure 2.&nbsp; Image from a CMOS camera with Flat field correction<\/strong><\/h4>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Other developments to the QUARTZ series are:<\/p>\n<ul>\n<li>Improved frame-to-frame stability by a factor of 2.5 to correct for image sensor variations.<\/li>\n<li>More Flat Field Correction sets to support <a href=\"\/\/cdn2.hubspot.net\/hub\/20421\/file-13404176-pdf\/docs\/adimec_true_accurate_imaging.pdf\" title=\"True Accurate Imaging\" target=\"_blank\">True Accurate Imaging<\/a>\u00ae<\/li>\n<li>Reduced power consumption by about 2.5W for stable camera operation.<\/li>\n<li>More efficient implementation of the dual <a href=\"https:\/\/www.adimec.com\/resources\/technology\/coaxpress\/\" title=\"CoaXPress\" target=\"_blank\">CoaXPress<\/a> interface<\/li>\n<li>Support for higher resolution image sensors (e.g. 8 MP and greater)<\/li>\n<li>More flexibility for customization options<\/li>\n<\/ul>\n<p>As image sensors are becoming more power-hungry because of increased resolution, datarates, and therefore more complex blemish corrections, <a href=\"https:\/\/www.adimec.com\/\" title=\"Adimec\" target=\"_blank\">Adimec<\/a> will continue to improve its camera platforms to deliver to the customer the high performance cameras they have come to expect from Adimec.<\/p>\n<p>At the <a href=\"https:\/\/www.messe-stuttgart.de\/\" title=\"Vision International Trade Fair for Machine Vision\" target=\"_blank\">Vision International Trade Fair for Machine Vision<\/a> in Stuttgart, Germany November 6-8, 2012, we will exhibit the <a href=\"https:\/\/www.adimec.com\/en\/Service_Menu\/News?listciid=3434\" title=\"upgraded QUARTZ series\" target=\"_blank\">upgraded QUARTZ series<\/a>.&nbsp; In Booth number 1G68, we will demonstrate the <a href=\"https:\/\/www.adimec.com\/en\/Service_Menu\/Industrial_camera_products\/High_performance_cameras_for_the_machine_vision_applications\/QUARTZ_series_High_speed_CMOS_global_shutter_cameras\/Q-12A65\" title=\"Q-12A65\" target=\"_blank\">Q-12A65<\/a>, which is a 12 Megapixel camera with 66 fps over Camera Link using the latest <a href=\"http:\/\/www.cmosis.com\" title=\"CMOSIS\" target=\"_blank\">CMOSIS<\/a> CMV12000 sensor.<\/p>\n<p>&nbsp;<\/p>\n<p>Related Blogs:<\/p>\n<p><a href=\"http:\/\/info.adimec.com\/blogposts\/bid\/43199\/Flat-field-correction-improves-machine-vision-camera-uniformity\" title=\"Flat field correction improves machine vision camera uniformity\" target=\"_blank\">Flat field correction improves machine vision camera uniformity<\/a><\/p>\n<p><a href=\"http:\/\/info.adimec.com\/blogposts\/bid\/70923\/Advantages-of-in-camera-image-processing-How-camera-technology-makes-a-better-picture-part-2\" title=\"Advantages of in camera image processing: &nbsp;How camera technology makes a better picture\" target=\"_blank\">Advantages of in camera image processing: &nbsp;How camera technology makes a better picture<\/a><\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/www.adimec.com\/cameras\/machine-vision-cameras\/quartz-series\/\" target=\"_blank\"><img decoding=\"async\" id=\"img-1349945925053\" src=\"\/\/cdn2.hubspot.net\/hub\/20421\/file-13402149-png\/images\/banner-psd-4mpx-q-series-cx.png\" border=\"0\" alt=\"describe the image\" \/><\/a>&nbsp;<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Flat Field Correction (FFC)&nbsp;processing can be used to minimize or even remove artifacts to improve the im&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-1896","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 v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>In-Field Calibrations for Optimal Machine Vision Image Accuracy - Adimec JA<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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