{"id":19001,"date":"2023-01-10T12:33:35","date_gmt":"2023-01-10T07:03:35","guid":{"rendered":"https:\/\/iihs.co.in\/knowledge-gateway\/?p=19001"},"modified":"2023-01-10T12:33:35","modified_gmt":"2023-01-10T07:03:35","slug":"luminance-measurements-using-smartphone-cameras","status":"publish","type":"post","link":"https:\/\/iihs.co.in\/knowledge-gateway\/luminance-measurements-using-smartphone-cameras\/","title":{"rendered":"Luminance Measurements using Smartphone Cameras"},"content":{"rendered":"<div id='full_slider_1'  class='avia-fullwidth-slider main_color avia-shadow   avia-builder-el-0  el_before_av_layout_row  avia-builder-el-first   container_wrap sidebar_right'  ><div  class='avia-slideshow av-av_slideshow_full-256baf843038993bbe2e04682c8b91b9 avia-slideshow-featured av_slideshow_full avia-fade-slider av-slideshow-ui av-control-hidden av-no-slider-navigation av-hide-nav-arrows av-slideshow-manual av-loop-once av-loop-manual-endless av-default-height-applied   avia-slideshow-1' 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data-created_by=\"avia_inline_auto\" id=\"style-css-av-lcpvl3rb-a38e987b49f73a5ec6b6c1cd5afccccc\">\n#top .av-special-heading.av-lcpvl3rb-a38e987b49f73a5ec6b6c1cd5afccccc{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-lcpvl3rb-a38e987b49f73a5ec6b6c1cd5afccccc .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-lcpvl3rb-a38e987b49f73a5ec6b6c1cd5afccccc .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-lcpvl3rb-a38e987b49f73a5ec6b6c1cd5afccccc av-special-heading-h3  avia-builder-el-5  el_before_av_textblock  avia-builder-el-first '><h3 class='av-special-heading-tag'  itemprop=\"headline\"  >Luminance Measurements using Smartphone Cameras<\/h3><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<section  class='av_textblock_section av-lcpvzpql-def5c42098e480e64c51a4af2c58d774 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><span style=\"font-size: 13px; text-transform: none; color: #8a0000;\"><em><a href=\"https:\/\/iihs.co.in\/iihs-people\/team\/amanda-thounaojam\/\" target=\"_blank\" rel=\"noopener\">Amanda Thounaojam<\/a>, <a href=\"https:\/\/iihs.co.in\/iihs-people\/team\/prasad-vaidya\/\" target=\"_blank\" rel=\"noopener\">Prasad Vaidya<\/a>, Mundhe P, Maskarenj M. \u00a0<\/em>| 2022\u00a0<\/span><\/p>\n<\/div><\/section><br \/>\n<section  class='av_textblock_section av-lcpw0mjd-23a3efc0bb2d792c988d27304364ae4d '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p>Abstract<\/p>\n<p>We evaluate the daylight performance visual comfort buildings by measuring light in luminance and illuminance using luminance and lux meter respectively. Detailed measurements of illuminance in a space using these methods on a grid can be time-consuming, while luminance meters to measure luminance values are quite expensive. Recent studies indicate that luminance-based metrics have the best fit to occupant responses in visual comfort surveys. But High Dynamic Range (HDR) techniques can quickly capture a large field of view at a high resolution and can be done with DSLR cameras that are more accessible than luminance meters. This research goes one step further to evaluate the HDR acquisition method using even more accessible smartphone cameras. The method includes calibration of the HDR images using lux meters which are affordable and easily available. A variety of smartphone cameras were evaluated in a wide range of brightness conditions in a scene. The error between the low-cost HDR approach and the conventional approach of HDR imaging is determined and a method for correction factors is proposed. Vignetting corrections for the smartphone camera lens have been demonstrated. A visual comfort survey of a primarily daylit workshop space is done to document as a test case to evaluate the feasibility and accuracy of the low-cost HDR approach. Lux meter for calibration of HDRI images is found to be reasonably accurate (average error of 7%). Of the 6 smartphones studied, the maximum luminance was captured by iPhone 6 and which could only capture 17% of the measured luminance. The fisheye lens used in this study increases the FOV from 68\u00ba (no fisheye) to 136\u00b0 (with fisheye) but the FOV outside 100\u00b0 was not useful due to large vignetting effect.<\/p>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-av_hr-5ea7596238ed9f191e6b5e662093052f\">\n#top .hr.hr-invisible.av-av_hr-5ea7596238ed9f191e6b5e662093052f{\nheight:30px;\n}\n<\/style>\n<div  class='hr av-av_hr-5ea7596238ed9f191e6b5e662093052f hr-invisible  avia-builder-el-8  el_after_av_textblock  el_before_av_social_share '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n<div  class='av-social-sharing-box av-av_social_share-5995610a499585b311e23e1b98b9221f av-social-sharing-box-minimal  avia-builder-el-9  el_after_av_hr  avia-builder-el-last  av-social-sharing-box-fullwidth'><div class=\"av-share-box\"><h5 class='av-share-link-description av-no-toc '>Share this entry<\/h5><ul 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items)\">Economic Development<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/ecosystem\/\" class=\"tag-cloud-link tag-link-152 tag-link-position-12\" style=\"font-size: 15.826086956522pt;\" aria-label=\"Ecosystem (15 items)\">Ecosystem<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/energy\/\" class=\"tag-cloud-link tag-link-160 tag-link-position-13\" style=\"font-size: 11.478260869565pt;\" aria-label=\"Energy (4 items)\">Energy<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/environment-and-climate\/\" class=\"tag-cloud-link tag-link-104 tag-link-position-14\" style=\"font-size: 22pt;\" aria-label=\"Environment and Climate (80 items)\">Environment and Climate<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/equity\/\" class=\"tag-cloud-link tag-link-94 tag-link-position-15\" style=\"font-size: 9.5652173913043pt;\" aria-label=\"Equity (2 items)\">Equity<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/gender\/\" class=\"tag-cloud-link tag-link-110 tag-link-position-16\" style=\"font-size: 11.478260869565pt;\" aria-label=\"Gender (4 items)\">Gender<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/ghs-pop\/\" class=\"tag-cloud-link tag-link-183 tag-link-position-17\" style=\"font-size: 8pt;\" aria-label=\"GHS-POP (1 item)\">GHS-POP<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/governance\/\" class=\"tag-cloud-link tag-link-102 tag-link-position-18\" style=\"font-size: 18pt;\" aria-label=\"Governance (27 items)\">Governance<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/gynecology-and-obstetrics\/\" class=\"tag-cloud-link tag-link-188 tag-link-position-19\" style=\"font-size: 8pt;\" aria-label=\"Gynecology And Obstetrics (1 item)\">Gynecology And Obstetrics<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/health\/\" class=\"tag-cloud-link tag-link-151 tag-link-position-20\" style=\"font-size: 9.5652173913043pt;\" aria-label=\"Health (2 items)\">Health<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/higher-education\/\" class=\"tag-cloud-link tag-link-195 tag-link-position-21\" style=\"font-size: 8pt;\" aria-label=\"higher education (1 item)\">higher education<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/housing\/\" class=\"tag-cloud-link tag-link-13 tag-link-position-22\" style=\"font-size: 18pt;\" aria-label=\"Housing (27 items)\">Housing<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/human-development\/\" class=\"tag-cloud-link tag-link-100 tag-link-position-23\" style=\"font-size: 15.652173913043pt;\" aria-label=\"Human Development (14 items)\">Human Development<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/india\/\" class=\"tag-cloud-link tag-link-182 tag-link-position-24\" style=\"font-size: 8pt;\" aria-label=\"India (1 item)\">India<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/industrial-policy\/\" class=\"tag-cloud-link tag-link-80 tag-link-position-25\" style=\"font-size: 9.5652173913043pt;\" aria-label=\"Industrial Policy (2 items)\">Industrial Policy<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/institutional-structures\/\" class=\"tag-cloud-link tag-link-197 tag-link-position-26\" style=\"font-size: 8pt;\" aria-label=\"institutional structures (1 item)\">institutional structures<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/instructional-design\/\" class=\"tag-cloud-link tag-link-150 tag-link-position-27\" style=\"font-size: 9.5652173913043pt;\" aria-label=\"Instructional Design (2 items)\">Instructional Design<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/ipcc\/\" class=\"tag-cloud-link tag-link-126 tag-link-position-28\" style=\"font-size: 9.5652173913043pt;\" aria-label=\"IPCC (2 items)\">IPCC<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/knowledge\/\" class=\"tag-cloud-link tag-link-143 tag-link-position-29\" style=\"font-size: 10.608695652174pt;\" aria-label=\"Knowledge (3 items)\">Knowledge<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/land\/\" class=\"tag-cloud-link tag-link-108 tag-link-position-30\" style=\"font-size: 19.565217391304pt;\" aria-label=\"Land (42 items)\">Land<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/non-economic-loss\/\" class=\"tag-cloud-link tag-link-194 tag-link-position-31\" style=\"font-size: 8pt;\" aria-label=\"Non-Economic Loss &quot; (1 item)\">Non-Economic Loss &quot;<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/pedagogy\/\" class=\"tag-cloud-link tag-link-196 tag-link-position-32\" style=\"font-size: 8pt;\" aria-label=\"pedagogy (1 item)\">pedagogy<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/planning\/\" class=\"tag-cloud-link tag-link-106 tag-link-position-33\" style=\"font-size: 17.565217391304pt;\" aria-label=\"Planning (24 items)\">Planning<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/policies\/\" class=\"tag-cloud-link tag-link-146 tag-link-position-34\" style=\"font-size: 10.608695652174pt;\" aria-label=\"Policies (3 items)\">Policies<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/population-mapping\/\" class=\"tag-cloud-link tag-link-184 tag-link-position-35\" style=\"font-size: 8pt;\" aria-label=\"population mapping (1 item)\">population mapping<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/poverty-and-inequality\/\" class=\"tag-cloud-link tag-link-101 tag-link-position-36\" style=\"font-size: 17.391304347826pt;\" aria-label=\"Poverty and Inequality (23 items)\">Poverty and Inequality<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/research-communication\/\" class=\"tag-cloud-link tag-link-199 tag-link-position-37\" style=\"font-size: 8pt;\" aria-label=\"Bet365 लाइव क्रिकेट स्ट्रीमिंग Communication (1 item)\">Bet365 लाइव क्रिकेट स्ट्रीमिंग Communication<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/risk\/\" class=\"tag-cloud-link tag-link-97 tag-link-position-38\" style=\"font-size: 16.521739130435pt;\" aria-label=\"Risk (18 items)\">Risk<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/scholarly-publishing\/\" class=\"tag-cloud-link tag-link-130 tag-link-position-39\" style=\"font-size: 9.5652173913043pt;\" aria-label=\"Scholarly Publishing (2 items)\">Scholarly Publishing<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/science-gaps\/\" class=\"tag-cloud-link tag-link-193 tag-link-position-40\" style=\"font-size: 8pt;\" aria-label=\"Science Gaps (1 item)\">Science Gaps<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/sustainability\/\" class=\"tag-cloud-link tag-link-93 tag-link-position-41\" style=\"font-size: 12.782608695652pt;\" aria-label=\"Sustainability (6 items)\">Sustainability<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/transport\/\" class=\"tag-cloud-link tag-link-95 tag-link-position-42\" style=\"font-size: 12.173913043478pt;\" aria-label=\"Transport (5 items)\">Transport<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/urban-equality\/\" class=\"tag-cloud-link tag-link-198 tag-link-position-43\" style=\"font-size: 8pt;\" aria-label=\"urban equality (1 item)\">urban equality<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/urbanisation\/\" class=\"tag-cloud-link tag-link-88 tag-link-position-44\" style=\"font-size: 12.782608695652pt;\" aria-label=\"Urbanisation (6 items)\">Urbanisation<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/water-and-sanitation\/\" class=\"tag-cloud-link tag-link-96 tag-link-position-45\" style=\"font-size: 17.826086956522pt;\" aria-label=\"Water and Sanitation (26 items)\">Water and Sanitation<\/a><\/div>\n<\/div><\/div><\/p>\n<\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p><em>Amanda Thounaojam, Prasad Vaidya, Mundhe P, Maskarenj M.<\/em><\/p>\n<hr\/>\n","protected":false},"author":6,"featured_media":17766,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[71],"tags":[],"class_list":["post-19001","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-paper"],"_links":{"self":[{"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/posts\/19001","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/comments?post=19001"}],"version-history":[{"count":0,"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/posts\/19001\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/media\/17766"}],"wp:attachment":[{"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/media?parent=19001"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/categories?post=19001"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/tags?post=19001"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}