{"id":9322,"date":"2017-03-31T13:38:06","date_gmt":"2017-03-31T04:38:06","guid":{"rendered":"http:\/\/www.lp-research.com\/?p=9322"},"modified":"2020-05-06T14:10:39","modified_gmt":"2020-05-06T05:10:39","slug":"optical-inertial-sensor-fusion","status":"publish","type":"post","link":"https:\/\/www.lp-research.com\/ja\/optical-inertial-sensor-fusion\/","title":{"rendered":"Optical-Inertial Sensor Fusion"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_column_text]Optical position tracking and inertial orientation tracking are well established measurement methods. Each of these methods has its specific advantages and disadvantages. In this post we show an opto-inertial sensor fusion algorithm that joins the capabilities of both to create a capable system for position and orientation tracking.<\/p>\n<p>[\/vc_column_text]<header class=\"thememount-heading-wrapper thememount-heading-wrapper-align-left\"><div class=\"thememount-heading-wrapper-inner\"><h3 class=\"thememount-heading-align-left\"><span>How It Works<\/span><\/h3><\/div><\/header>[vc_column_text]The reliability of position and orientation data provided by an optical tracking system (outside-in or inside-out) can for some applications be compromised by occlusions and slow system reaction times. In such cases it makes sense to combine optical tracking data with information from an inertial measurement unit located on the device. Our optical-intertial sensor fusion algorithm implements this functionality for integration with an existing tracking system or for the development of a novel system for a specific application case.[\/vc_column_text][vc_single_image image=&#8221;9105&#8243; img_size=&#8221;large&#8221; alignment=&#8221;center&#8221;][vc_column_text]The graphs below show two examples of how the signal from an optical positioning system can be improved using inertial measurements. Slow camera framerates or occasional drop-outs are compensated by information from the integrated inertial measurement unit, improving the overall tracking performance.[\/vc_column_text][vc_single_image image=&#8221;9142&#8243; img_size=&#8221;large&#8221; alignment=&#8221;center&#8221;]<header class=\"thememount-heading-wrapper thememount-heading-wrapper-align-left\"><div class=\"thememount-heading-wrapper-inner\"><h3 class=\"thememount-heading-align-left\"><span>Combination of Several Optical Trackers<\/span><\/h3><\/div><\/header>[vc_column_text]<\/p>\n<p>For a demonstration, we combined three <a href=\"http:\/\/nexonar.com\" target=\"_blank\" rel=\"noopener noreferrer\"><u>NEXONAR IR trackers<\/u><\/a> and an <a href=\"https:\/\/www.lp-research.com\/lpms-b2\/\"><u>LPMS-B2 IMU<\/u><\/a>, mounted together as a hand controller. The system allows position and orientation tracking of the controller with high reliability and accuracy. It combines the strong aspects of outside-in IR tracking with inertial tracking, improving the system&#8217;s reaction time and robustness against occlusions.<\/p>\n<p>[\/vc_column_text][vc_video link=&#8221;https:\/\/vimeo.com\/185318670&#8243;]<header class=\"thememount-heading-wrapper thememount-heading-wrapper-align-left\"><div class=\"thememount-heading-wrapper-inner\"><h3 class=\"thememount-heading-align-left\"><span>Optical-Inertial Tracking in VR<\/span><\/h3><\/div><\/header>[vc_column_text css=&#8221;.vc_custom_1491187691349{padding-bottom: 20px !important;}&#8221;]The tracking of virtual reality (VR) headsets is one important area of application for this method. To keep the user immersed in a virtual environment, high quality head tracking is essential. Using opto-inertial tracking technology, outside-in tracking as well as inside-out camera-only tracking can be significantly improved.[\/vc_column_text][vc_single_image image=&#8221;9106&#8243; img_size=&#8221;large&#8221; alignment=&#8221;center&#8221;][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_column_text]Optical position tracking and inertial orien [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[49,45],"tags":[57,55,13,52],"class_list":["post-9322","post","type-post","status-publish","format-standard","hentry","category-projects","category-use-cases","tag-lpms-b","tag-nexonar","tag-sensor-fusion","tag-virtual-reality"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.1 (Yoast SEO v24.9) - 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