{"id":3821,"date":"2015-06-09T09:13:49","date_gmt":"2015-06-09T15:13:49","guid":{"rendered":"http:\/\/apps.lib.ua.edu\/blogs\/digitalservices\/?p=3404"},"modified":"2015-06-09T09:13:49","modified_gmt":"2015-06-09T15:13:49","slug":"3d-digitization-project-round-two","status":"publish","type":"post","link":"https:\/\/apps.lib.ua.edu\/blogs\/coolathoole\/2015\/06\/09\/3d-digitization-project-round-two\/","title":{"rendered":"3D Digitization Project, round two"},"content":{"rendered":"

It’s been some time since we updated you<\/a> on Jeremiah’s 3D digitization project. It’s been through one round of prototype and testing, and now it’s in a second phase. We thought we’d talk about where we are and show off an early 3D printing test.<\/p>\n

The Old Process<\/h2>\n

The first version of the process — using our Canon EOS 6D plus custom hardware and software — was successful in exactly the way you want an exploratory project\u00a0to be: it worked well enough to confirm proof of concept and provide feedback to guide further\u00a0development.<\/p>\n

The old process had two main drawbacks. First of all, it wasn’t entirely automatic. One still needed to manually capture the item, using the custom lighting rig and aperture mask (pictured below) to facilitate an incremental shift of perspective over dozens of photos.<\/p>\n

\"photo05\"<\/a><\/p>\n

It was also necessary to use Photoshop for parts of the process: for\u00a0visual assessment \u00a0— checking to make sure the greenscreen process went as expected\u00a0— and to\u00a0create the final composite image. Only then could that composite “height map” be compiled with the “texture map” in his software to create the 3D image.<\/p>\n

Secondly, there\u00a0was a concern with the resulting 3D manifestations.\u00a0Since the process used exposure\u00a0to determine depth, highlights from shiny objects or changes in color\u00a0across the surface of an item might be interpreted as changes in lightness and darkness — therefore, in exposure —\u00a0creating anomalies in depth in the finished product.<\/p>\n

The New Process<\/h2>\n

The second phase of the project involved trying a different version of the same compositing\u00a0system. It\u00a0meant building on previous work but also rethinking some aspects of the process.<\/p>\n

First, the automation problem. Jeremiah discovered that a particular digital camera, the Canon PowerShot, is highly hack-able, lending itself to being manipulated by computer programs. Here’s the used model he\u00a0bought, in all its hot\u00a0pink glory. \ud83d\ude42<\/p>\n

\"3d-dig-camera-setup1\"<\/a><\/p>\n

With a computer script\u00a0telling\u00a0the camera what to do, it can automatically capture the necessary range of images needed for the compositing process, no human intervention required. Here it is in action, mounted on a camera stand and aimed at a test environment.<\/p>\n

\"3d-dig-camera-setup2\"<\/a><\/p>\n

The process now depends\u00a0on sharpness to determine depth, rather than light, a much more reliable method that admits a greater range of objects with various textures and colors. This also\u00a0takes away the need for the\u00a0special lighting and\u00a0aperture hardware.<\/p>\n

Even better, it\u00a0allows for automated compositing, with his Ruby program doing the interpreting work based on contrast from pixel to pixel. No more wrangling in Photoshop — in fact, no Photoshop at all!<\/p>\n

A Test\u00a0Product<\/h2>\n

One of the desired outcomes from the project is not just a web-displayable 3D object, but also a computer file that will allow you to 3D print that object. Jeremiah recently took one of his earlier test files to be\u00a0printed. The object he captured is\u00a0pictured here for reference, with lighting from multiple angles so you can get a sense of its contours.<\/p>\n

\"cameo-composite\"<\/a><\/p>\n

Captured and reproduced, it came out\u00a0like this (evenly lit on the left, lit from an angle on the right).<\/p>\n

\"printed-cameo-composite\"<\/a><\/p>\n

You’ll notice two things: it’s rough, and it’s backwards. The backwardness is probably fixable; a tweak to the software should make it possible to reverse things. The roughness will probably take some more complex adjustments to the software.\u00a0The 3D printer we used couldn’t really deal with the fineness of detail in\u00a0his STL\u00a0file. It’s like\u00a0using a Sharpie marker to fill out a form designed for\u00a0a\u00a0ballpoint pen — it’ll work, but it’ll be messy.<\/p>\n

Jeremiah assures me there’s still a ways to go with the new process. Hopefully, one of those output files will be ready for print testing soon. We’ll keep you posted.<\/p>\n","protected":false},"excerpt":{"rendered":"

It’s been some time since we updated you on Jeremiah’s 3D digitization project. It’s been through one round of prototype and testing, and now it’s in a second phase. We thought we’d talk about where we are and show off … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":426,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11813],"tags":[11812],"class_list":["post-3821","post","type-post","status-publish","format-standard","hentry","category-projects","tag-3d"],"yoast_head":"\n3D Digitization Project, round two - What's Cool at Hoole<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/apps.lib.ua.edu\/blogs\/coolathoole\/2015\/06\/09\/3d-digitization-project-round-two\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"3D Digitization Project, round two - What's Cool at Hoole\" \/>\n<meta property=\"og:description\" content=\"It’s been some time since we updated you on Jeremiah’s 3D digitization project. 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