{"id":1908,"date":"2024-12-22T23:46:00","date_gmt":"2024-12-22T14:46:00","guid":{"rendered":"http:\/\/chino.local\/?post_type=project&#038;p=1908"},"modified":"2024-12-24T09:01:50","modified_gmt":"2024-12-24T00:01:50","slug":"rapid-and-accurate-time-synchronization-using-led-and-general-purpose-video-camera","status":"publish","type":"project","link":"https:\/\/c-mng.cwh.hokudai.ac.jp\/iis-lab.ist\/Root\/en\/project\/rapid-and-accurate-time-synchronization-using-led-and-general-purpose-video-camera","title":{"rendered":"Rapid and Accurate Time Synchronization using LED and General Purpose Video Camera"},"content":{"rendered":"\n<div class=\"is-layout-flex wp-container-3 wp-block-columns\">\n<div class=\"is-layout-flow wp-block-column\" style=\"flex-basis:66.66%\">\n<p>LED illuminations are showing signs of wider acceptance in our society. By using a general purpouse video camera, such as a smartphone built-in camera, we propose a rapid and accurate timesynchronization technique. Optimally modulated illumination as a function of camera exposure time is investigated through theoretical analyses and its mathematical representation is derived. Experiments in real environments with a single LED and 60 fps camera show that the proposed technique can achieve time synchronization to within a 26.3 \u03bc s error at the 90th percentile using only four frames (a measurement time of 0.067 s). Comparative experiments with computer simulations prove that the proposed technique using optimally modulated illumination to camera exposure time needs less CPU time than that using nonoptimally modulated illumination. Applications utilizing features of the proposed technique, such as high-speed visible light communication (VLC), illegal photography detection, indoor localizaion, multi-camera synchronization for motion capture are being implemented.<\/p>\n<\/div>\n\n\n\n<div class=\"is-layout-flow wp-block-column\" style=\"flex-basis:33.33%\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/c-mng.cwh.hokudai.ac.jp\/iis-lab.ist\/Root\/wp-content\/uploads\/2024\/12\/ranging-timesync.jpg\" alt=\"\" class=\"wp-image-4948\" width=\"291\" height=\"387\"\/><\/figure><\/div><\/div>\n<\/div>\n","protected":false},"featured_media":663,"parent":0,"template":"","meta":{"_locale":"en_US","_original_post":"http:\/\/chino.local\/?post_type=project&p=662","vkexunit_cta_each_option":""},"project_category":[32],"acf":[],"_links":{"self":[{"href":"https:\/\/c-mng.cwh.hokudai.ac.jp\/iis-lab.ist\/Root\/wp-json\/wp\/v2\/project\/1908"}],"collection":[{"href":"https:\/\/c-mng.cwh.hokudai.ac.jp\/iis-lab.ist\/Root\/wp-json\/wp\/v2\/project"}],"about":[{"href":"https:\/\/c-mng.cwh.hokudai.ac.jp\/iis-lab.ist\/Root\/wp-json\/wp\/v2\/types\/project"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/c-mng.cwh.hokudai.ac.jp\/iis-lab.ist\/Root\/wp-json\/"}],"wp:attachment":[{"href":"https:\/\/c-mng.cwh.hokudai.ac.jp\/iis-lab.ist\/Root\/wp-json\/wp\/v2\/media?parent=1908"}],"wp:term":[{"taxonomy":"project_category","embeddable":true,"href":"https:\/\/c-mng.cwh.hokudai.ac.jp\/iis-lab.ist\/Root\/wp-json\/wp\/v2\/project_category?post=1908"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}