{"id":344,"date":"2013-02-01T20:17:31","date_gmt":"2013-02-01T20:17:31","guid":{"rendered":"http:\/\/memetechnology.wordpress.com\/?p=2504"},"modified":"2013-02-01T20:17:31","modified_gmt":"2013-02-01T20:17:31","slug":"so-what-exactly-is-rti-anyway-updated","status":"publish","type":"post","link":"https:\/\/generic.wordpress.soton.ac.uk\/archaeology\/2013\/02\/01\/so-what-exactly-is-rti-anyway-updated\/","title":{"rendered":"So what exactly is RTI anyway? (Updated)"},"content":{"rendered":"<p>Remember that bit at the\u00a0beginning of <a title=\"IMDB\" href=\"http:\/\/www.imdb.com\/title\/tt0119116\/\"><em>The Fifth Element<\/em><\/a>, when the professor is trying to read the ancient pictograms and the sleepy boy keeps letting the mirror drop? Turns out what that professor needed was RTI.<\/p>\n<p>I spent a fun day today working alongside volunteer guides at <a title=\"Cathedral Website\" href=\"http:\/\/winchester-cathedral.org.uk\/\">Winchester Cathedral<\/a>. But we were not giving tours. We were taking pictures of\u00a0graffiti. But with some of these scratches in stone and wood hundreds of years old, they could be difficult to read. That&#8217;s where RTI comes in. <a title=\"James' profile at Southampton\" href=\"http:\/\/acrg.soton.ac.uk\/people\/james-miles\/\">James Miles<\/a>, whose PhD work involves a lot of different ways of recording data about Winchester Cathedral asked for volunteers to help capture data about the graffiti using RTI\u00a0methodology.<\/p>\n<p>RTI stands for Reflectance Transformation Imaging. It involves a camera, a flashgun, a shiny black or red sphere (snooker or billiard balls are good), and a piece of string. Lets say you wanted to look at graffiti like this:<\/p>\n<p><a href=\"http:\/\/memetechnology.files.wordpress.com\/2013\/02\/img_3563.jpg\"><img class=\"alignnone size-medium wp-image-2505\" alt=\"IMG_3563\" src=\"http:\/\/memetechnology.files.wordpress.com\/2013\/02\/img_3563.jpg?w=224&#038;h=300\" width=\"224\" height=\"300\" \/><\/a><\/p>\n<p>This is your object. What you are doing to do is light it from a variety of different angles and take a photo of it each time. You&#8217;ll want no less that 24 different angles\/photos, and the more you have the better the results &#8211; until you get to about 80.<\/p>\n<p>In the end, you&#8217;ll import all these photos into a bit of software, which will create a composite image, within which you can virtually &#8220;move&#8221; the light source around to get the very best angle for which part of the image you are looking at. You can manipulate the image in other ways too, which will (in this case) make the graffiti more readable. But to do all that the software needs to know exactly where you lit the object from in each photo, and that&#8217;s where the billiard ball comes in. So first of all, lets mount the billiard ball on a tripod near the object and of course position the camera so that it frames both what you want to photograph <em>and<\/em> the sphere:<\/p>\n<p><a href=\"http:\/\/memetechnology.files.wordpress.com\/2013\/02\/img_3567.jpg\"><img class=\"alignnone size-medium wp-image-2506\" alt=\"IMG_3567\" src=\"http:\/\/memetechnology.files.wordpress.com\/2013\/02\/img_3567.jpg?w=224&#038;h=300\" width=\"224\" height=\"300\" \/><\/a><\/p>\n<p>From now on, none of these three can move. The object has of course been there for hundreds of years, but its your responsibility not to knock either tripod (as I knocked the one with the sphere, the first time I tried this). To make it easy on the computer you&#8217;ll be using later, the flash has got to be the same distance from the centre of the object in every photo you take. This is where the string comes in. Use a length of string three times the width of the object to measure the distance of the flash from the object each time you reposition it. This way you are creating virtual dome of lights around the object.<\/p>\n<p><a href=\"http:\/\/memetechnology.files.wordpress.com\/2013\/02\/img_3572.jpg\"><img class=\"alignnone size-medium wp-image-2507\" alt=\"IMG_3572\" src=\"http:\/\/memetechnology.files.wordpress.com\/2013\/02\/img_3572.jpg?w=224&#038;h=300\" width=\"224\" height=\"300\" \/><\/a><\/p>\n<p>At this point you&#8217;ll want to take a few experimental snaps to get an optimum combination of \u00a0flash-power, shutter speed and f-stop. The camera is, of course, in fully manual mode, you don&#8217;t want it changing things after you&#8217;ve set it up.<\/p>\n<p>Happy with your set up you&#8217;ll start taking photos. But you don&#8217;t want to touch the camera, so it&#8217;s best you use one of those remote control doo-dads that triggers both flash and camera. Our team included one to hold the flash one to hold the other end of the string, these two also have to concentrate on avoiding camera, ball and tripods, so we had a third volunteer to trigger the camera from a safe distance (when the string is safely out of the way), and in this case a fourth to hold a white piece of paper behind the ball, which would otherwise be lost in shadow:<\/p>\n<p><a href=\"http:\/\/memetechnology.files.wordpress.com\/2013\/02\/img_3571.jpg\"><img class=\"alignnone size-medium wp-image-2508\" alt=\"IMG_3571\" src=\"http:\/\/memetechnology.files.wordpress.com\/2013\/02\/img_3571.jpg?w=224&#038;h=300\" width=\"224\" height=\"300\" \/><\/a> <a href=\"http:\/\/memetechnology.files.wordpress.com\/2013\/02\/img_3574.jpg\"><img class=\"alignnone size-medium wp-image-2509\" alt=\"IMG_3574\" src=\"http:\/\/memetechnology.files.wordpress.com\/2013\/02\/img_3574.jpg?w=224&#038;h=300\" width=\"224\" height=\"300\" \/><\/a><\/p>\n<p>Each time you shoot, move the flash methodically around the object. Most of us decided this meant starting at the top, and moving the flash down a few degrees each time, then starting another vertical column a few degrees round to the right. We had to take care not to light the object from any position where ball, camera or tripod would cast a shadow on the object. And remember, move either ball or camera, and you have to start again&#8230;<\/p>\n<p>Next its back to the computer. Here&#8217;s trainer, Hembo, showing us how to process the data:<br \/>\n<a href=\"http:\/\/memetechnology.files.wordpress.com\/2013\/02\/img_3583.jpg\"><img class=\"alignnone size-medium wp-image-2510\" alt=\"IMG_3583\" src=\"http:\/\/memetechnology.files.wordpress.com\/2013\/02\/img_3583.jpg?w=300&#038;h=224\" width=\"300\" height=\"224\" \/><\/a><\/p>\n<p>This is where the billiard ball comes in. The first stage of creating the image is to show the computer where to look for the ball. The software identifies the ball in each picture, and pinpoints where on the ball&#8217;s surface the flash is reflected. Then for each pixel in that picture (and here I might be oversimplifying what was explained) the software &#8220;deletes&#8221; any light that isn&#8217;t coming from exactly the same direction. Then, with some clever maths, it puts all the data left from all the pictures together in a file that you can manipulate in another bit of software (the viewer). Here&#8217;s that being demonstrated:<\/p>\n<p><a href=\"http:\/\/memetechnology.files.wordpress.com\/2013\/02\/img_3582.jpg\"><img class=\"alignnone size-medium wp-image-2511\" alt=\"IMG_3582\" src=\"http:\/\/memetechnology.files.wordpress.com\/2013\/02\/img_3582.jpg?w=224&#038;h=300\" width=\"224\" height=\"300\" \/><\/a><\/p>\n<p>So, <em>that&#8217;s<\/em> what RTI is.<\/p>\n<p>Some of the\u00a0manipulated\u00a0images from the graffiti that we recorded will be online <del>soon. And when they are, I&#8217;ll post a link<\/del>. UPDATE: here&#8217;s <a title=\"Southampton University Archaeology blog\" href=\"http:\/\/acrg.soton.ac.uk\/blog\/2716\/\">the link<\/a>, scroll down and click on the pictures: they&#8217;ll reveal the enhanced version. I was involved in Hembo&#8217;s group.<\/p>\n<br \/>  <a rel=\"nofollow\" href=\"http:\/\/feeds.wordpress.com\/1.0\/gocomments\/memetechnology.wordpress.com\/2504\/\"><img alt=\"\" border=\"0\" src=\"http:\/\/feeds.wordpress.com\/1.0\/comments\/memetechnology.wordpress.com\/2504\/\" \/><\/a> <img alt=\"\" border=\"0\" src=\"http:\/\/stats.wordpress.com\/b.gif?host=memetechnology.wordpress.com&#038;blog=43249545&amp;%23038;post=2504&amp;%23038;subd=memetechnology&amp;%23038;ref=&amp;%23038;feed=1\" width=\"1\" height=\"1\" \/>","protected":false},"excerpt":{"rendered":"<p>Remember that bit at the\u00a0beginning of The Fifth Element, when the professor is trying to read the ancient pictograms and the sleepy boy keeps letting the mirror drop? Turns out what that professor needed was RTI. I spent a fun &#8230; <a href=\"http:\/\/memetechnology.wordpress.com\/2013\/02\/01\/so-what-exactly-is-rti-anyway\/\">Continue reading <span>&#8594;<\/span><\/a><img loading=\"lazy\" decoding=\"async\" alt=\"\" border=\"0\" src=\"http:\/\/stats.wordpress.com\/b.gif?host=memetechnology.wordpress.com&amp;blog=43249545&amp;post=2504&amp;subd=memetechnology&amp;ref=&amp;feed=1\" width=\"1\" height=\"1\" \/><\/p>\n","protected":false},"author":337,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[128],"class_list":["post-344","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-blog","column","threecol"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>So what exactly is RTI anyway? (Updated) - Archaeology Blogs<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/generic.wordpress.soton.ac.uk\/archaeology\/2013\/02\/01\/so-what-exactly-is-rti-anyway-updated\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"So what exactly is RTI anyway? (Updated) - Archaeology Blogs\" \/>\n<meta property=\"og:description\" content=\"Remember that bit at the\u00a0beginning of The Fifth Element, when the professor is trying to read the ancient pictograms and the sleepy boy keeps letting the mirror drop? Turns out what that professor needed was RTI. I spent a fun &#8230; Continue reading &#8594;\" \/>\n<meta property=\"og:url\" content=\"http:\/\/generic.wordpress.soton.ac.uk\/archaeology\/2013\/02\/01\/so-what-exactly-is-rti-anyway-updated\/\" \/>\n<meta property=\"og:site_name\" content=\"Archaeology Blogs\" \/>\n<meta property=\"article:published_time\" content=\"2013-02-01T20:17:31+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/memetechnology.files.wordpress.com\/2013\/02\/img_3563.jpg?w=224&#038;h=300\" \/>\n<meta name=\"author\" content=\"Matthew Tyler-Jones\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Matthew Tyler-Jones\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"http:\\\/\\\/generic.wordpress.soton.ac.uk\\\/archaeology\\\/2013\\\/02\\\/01\\\/so-what-exactly-is-rti-anyway-updated\\\/#article\",\"isPartOf\":{\"@id\":\"http:\\\/\\\/generic.wordpress.soton.ac.uk\\\/archaeology\\\/2013\\\/02\\\/01\\\/so-what-exactly-is-rti-anyway-updated\\\/\"},\"author\":{\"name\":\"Matthew Tyler-Jones\",\"@id\":\"https:\\\/\\\/generic.wordpress.soton.ac.uk\\\/archaeology\\\/#\\\/schema\\\/person\\\/a61d3a83f159c463727cd087c1ce643e\"},\"headline\":\"So what exactly is RTI anyway? 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(Updated)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/generic.wordpress.soton.ac.uk\\\/archaeology\\\/#website\",\"url\":\"https:\\\/\\\/generic.wordpress.soton.ac.uk\\\/archaeology\\\/\",\"name\":\"Archaeology Blogs\",\"description\":\"Archaeology Blogs\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/generic.wordpress.soton.ac.uk\\\/archaeology\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/generic.wordpress.soton.ac.uk\\\/archaeology\\\/#\\\/schema\\\/person\\\/a61d3a83f159c463727cd087c1ce643e\",\"name\":\"Matthew Tyler-Jones\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/b05de4152c16b059324bcceb7e15c65ec426d00af787220dcbb922248b71de61?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/b05de4152c16b059324bcceb7e15c65ec426d00af787220dcbb922248b71de61?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/b05de4152c16b059324bcceb7e15c65ec426d00af787220dcbb922248b71de61?s=96&d=mm&r=g\",\"caption\":\"Matthew Tyler-Jones\"},\"description\":\"I came to cultural heritage via five years working at Midland Bank when I left school. In my free time, I volunteered as a costumed interpreter at Kentwell Hall and, with re-enactment societies, at various medieval sites around the UK and France. When, one evening, a few of us said \u201cwe could make a business out of this\u201d I left my job at the bank to go to college, first to get an Art Foundation and then to Manchester Polytechnic to join an innovative course called Design for Communications Media. I specialised in Educational Media Design, with the intention of applying what I was learning to cultural heritage. During my vacations and upon graduation I worked for the nascent company my friends had started, Past Pleasures, creating immersive living history festivals at Lancaster and Tunbridge Wells, as well as projects including: an exhibition for the centenary of the Commonwealth Institute; a design for a metafictional Sherlock Holmes exhibition in Croydon; and, a game that combined real-time investment advice from 300 year-old characters at the Bank of England Museum with a digital simulation, tracking the players\u2019 investment portfolio from the founding of the bank to its tercentenary. In 1996 I helped found JMD&amp;Co, and for two years I also lectured on Heritage Tourism and Visitor Management and Interpretation modules for a Portsmouth University validated HND\\\/degree course at Farnborough Technical College. Subsequently, I enrolled in the new Distance Learning delivered Masters\u2019 degree in Museum Studies at Leicester University, where I became interested in the social use of space, particularly Bill Hillier\u2019s \u201cspace syntax,\u201d and the increasing futility of cultural heritage sites trying to tell doggedly linear stories in three-dimensional spaces. Although my dissertation explored models for mapping interpretation, and particularly learning styles, onto spaces, a satisfactory reconciliation of linear story and three-dimensional space eluded me. After graduation, I decided my time in the \u201csmall business\u201d end of cultural heritage was over for a while, and I left JMD&amp;Co to join a cultural institution, the National Trust, as a Regional Community, Learning and Volunteering Manager. I brought the first National Trust iPad into use at Batemans, where, combined with a wax cylinder record player, and the help of renowned folk singer, Jon Boden, we\u2019ve returned Rudyard Kipling\u2019s voice back into his old home. However, one of the innovations which I am most proud of is the National Trust\u2019s virtual tours. Working with a small company, and a range of disabled stakeholders, we created a touch-screen based human computer interface that could also, if required, be controlled with other input devices, and allowed visitors with a variety of disabilities to fully enjoy the virtual tour. The teams\u2019 achievement was recognised with a Jodi Award for Excellence in accessible digital media in 2008.\",\"sameAs\":[\"http:\\\/\\\/memetechnology.wordpress.com\\\/\"],\"url\":\"https:\\\/\\\/generic.wordpress.soton.ac.uk\\\/archaeology\\\/author\\\/matthew-tyler-jones\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"So what exactly is RTI anyway? (Updated) - Archaeology Blogs","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"http:\/\/generic.wordpress.soton.ac.uk\/archaeology\/2013\/02\/01\/so-what-exactly-is-rti-anyway-updated\/","og_locale":"en_US","og_type":"article","og_title":"So what exactly is RTI anyway? 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(Updated)"}]},{"@type":"WebSite","@id":"https:\/\/generic.wordpress.soton.ac.uk\/archaeology\/#website","url":"https:\/\/generic.wordpress.soton.ac.uk\/archaeology\/","name":"Archaeology Blogs","description":"Archaeology Blogs","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/generic.wordpress.soton.ac.uk\/archaeology\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/generic.wordpress.soton.ac.uk\/archaeology\/#\/schema\/person\/a61d3a83f159c463727cd087c1ce643e","name":"Matthew Tyler-Jones","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/b05de4152c16b059324bcceb7e15c65ec426d00af787220dcbb922248b71de61?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/b05de4152c16b059324bcceb7e15c65ec426d00af787220dcbb922248b71de61?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/b05de4152c16b059324bcceb7e15c65ec426d00af787220dcbb922248b71de61?s=96&d=mm&r=g","caption":"Matthew Tyler-Jones"},"description":"I came to cultural heritage via five years working at Midland Bank when I left school. In my free time, I volunteered as a costumed interpreter at Kentwell Hall and, with re-enactment societies, at various medieval sites around the UK and France. When, one evening, a few of us said \u201cwe could make a business out of this\u201d I left my job at the bank to go to college, first to get an Art Foundation and then to Manchester Polytechnic to join an innovative course called Design for Communications Media. I specialised in Educational Media Design, with the intention of applying what I was learning to cultural heritage. During my vacations and upon graduation I worked for the nascent company my friends had started, Past Pleasures, creating immersive living history festivals at Lancaster and Tunbridge Wells, as well as projects including: an exhibition for the centenary of the Commonwealth Institute; a design for a metafictional Sherlock Holmes exhibition in Croydon; and, a game that combined real-time investment advice from 300 year-old characters at the Bank of England Museum with a digital simulation, tracking the players\u2019 investment portfolio from the founding of the bank to its tercentenary. In 1996 I helped found JMD&amp;Co, and for two years I also lectured on Heritage Tourism and Visitor Management and Interpretation modules for a Portsmouth University validated HND\/degree course at Farnborough Technical College. Subsequently, I enrolled in the new Distance Learning delivered Masters\u2019 degree in Museum Studies at Leicester University, where I became interested in the social use of space, particularly Bill Hillier\u2019s \u201cspace syntax,\u201d and the increasing futility of cultural heritage sites trying to tell doggedly linear stories in three-dimensional spaces. Although my dissertation explored models for mapping interpretation, and particularly learning styles, onto spaces, a satisfactory reconciliation of linear story and three-dimensional space eluded me. After graduation, I decided my time in the \u201csmall business\u201d end of cultural heritage was over for a while, and I left JMD&amp;Co to join a cultural institution, the National Trust, as a Regional Community, Learning and Volunteering Manager. I brought the first National Trust iPad into use at Batemans, where, combined with a wax cylinder record player, and the help of renowned folk singer, Jon Boden, we\u2019ve returned Rudyard Kipling\u2019s voice back into his old home. However, one of the innovations which I am most proud of is the National Trust\u2019s virtual tours. Working with a small company, and a range of disabled stakeholders, we created a touch-screen based human computer interface that could also, if required, be controlled with other input devices, and allowed visitors with a variety of disabilities to fully enjoy the virtual tour. The teams\u2019 achievement was recognised with a Jodi Award for Excellence in accessible digital media in 2008.","sameAs":["http:\/\/memetechnology.wordpress.com\/"],"url":"https:\/\/generic.wordpress.soton.ac.uk\/archaeology\/author\/matthew-tyler-jones\/"}]}},"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/generic.wordpress.soton.ac.uk\/archaeology\/wp-json\/wp\/v2\/posts\/344","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/generic.wordpress.soton.ac.uk\/archaeology\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/generic.wordpress.soton.ac.uk\/archaeology\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/generic.wordpress.soton.ac.uk\/archaeology\/wp-json\/wp\/v2\/users\/337"}],"replies":[{"embeddable":true,"href":"https:\/\/generic.wordpress.soton.ac.uk\/archaeology\/wp-json\/wp\/v2\/comments?post=344"}],"version-history":[{"count":0,"href":"https:\/\/generic.wordpress.soton.ac.uk\/archaeology\/wp-json\/wp\/v2\/posts\/344\/revisions"}],"wp:attachment":[{"href":"https:\/\/generic.wordpress.soton.ac.uk\/archaeology\/wp-json\/wp\/v2\/media?parent=344"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/generic.wordpress.soton.ac.uk\/archaeology\/wp-json\/wp\/v2\/categories?post=344"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/generic.wordpress.soton.ac.uk\/archaeology\/wp-json\/wp\/v2\/tags?post=344"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}