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Found 23 results

  1. Photosbykev

    Embedding Rti viewer into Wordpress

    Searching the forums all of the options for viewing rti format images from within WordPress seems to have stalled years ago. I've just got the WebRtiviewer installed on my server and it works well on a static html page. Looking at the source code of the static page there are a number of links to things like spiderGL directories etc and then a simple container script to launch the rti file into the viewer. Has anyone had success porting this html code into a WordPress page? It doesn't look too difficult but I'm failing at the moment lol Regards Kev
  2. We get asked this question a lot, so I thought I'd post it here in the FAQ! The file format specification for PTM is available from the HP website here: http://www.hpl.hp.com/research/ptm/downloads/PtmFormat12.pdf The file Format Specification for the RTI file format was previously posted here in the forums, and I am attaching it here as well. Note that it is marked "draft" because it contemplates a .xmp structure embedded in the file structure, and that part was still under discussion when this document was created. The format for the RTI data is final, and this is what is used by the RTIViewer and other viewers that support this format. Carla rti_format_final-draft.pdf
  3. CHI is delighted to announce that all the recorded talks from our NEH-sponsored symposium at The Met last March -- "Illumination of Material Culture: A Symposium on Computational Photography and Reflectance Transformation Imaging (RTI)" -- are available now from the museum website: https://www.metmuseum.org/about-the-met/conservation-and-scientific-research/projects/rti-symposium/ These talks by worldwide experts share the latest research and use cases in the application of Reflectance Transformation Imaging (RTI) and related topics in computational photography. Enjoy!
  4. As an RTI newbie, I hope I am not violating any forum customs. Please feel free to move this question to a more appropriate location if needed! I have persuaded the Israel Antiquities Authority to produce three RTI images of an ancient artifact that I think has been neglected by scholars. Now that I have the RTI images in hand, I would like to post them on the web in such a way that anyone with a modern browser can view them, but not be able to download the actual RTI files themselves — at least for the time being. In reviewing the existing forum topics, I found the RTI AHRC Project (UK) topic to be promising, but the emphasis there seems to be on expanding analytical features of the viewer being developed, and the topic has been quiescent for over two years. I just noticed a link to CHER-Ob, but haven't determined its relevance yet… Is there a basic web viewer available, or is there another approach I could be taking? R. Peter DeLong independent researcher
  5. Hi, I'm interested in stitching together multiple RTIs of an object. Essentially, this object is very large and the details are lost in a single RTI. I would like to take RTIs of each section and then join them together. Projects I have seen thus far join static images via photogrammetry. I'd like to keep the ability to move the light source in the final product. Does anyone have any experience in this?
  6. Hi everyone, I wanted to share with you an RTI capture system I've devised that uses 3D printed and laser cut parts in addition to some easily acquired bits of hardware. The rig was designed as a sort of alternative to dome-style automatic capture systems for researchers who are not comfortable doing their own wiring or programming, have really low budgets, or work in especially adverse field conditions. It consists of a flashlight attached to a wooden arm, which is connected to a lazy susan bearing. This allows the arm / light to rotate around a stable platform. I recently presented this project as a poster at the annual meeting of the European Society for the Study of Human Evolution in Madrid, Spain. You can download files for 3D printing / laser cutting, assembly instructions, and my poster on the Data Repository for the University of Minnesota. Please let me know if you have any comments or questions! Hopefully some of you may find this useful. -Samantha Porter
  7. TessaT

    RTI Mobile App

    Please feel free to take a look at the below video demonstrating the RTI Mobile App developed for iPad. Feedback is welcome, thank you! http://www.youtube.com/watch?v=F3h908iuFbU&feature=em-upload_owner Tessa and Cornell
  8. We are pleased to announce the next 4 day training class offerings at Cultural Heritage Imaging's studio in San Francisco. Also note that CHI training can come to you! And if you want to be informed about and even influence the dates of future training classes, write to us to get on our interest list. Photogrammetry Training - October 6-9, 2015 This is your last chance in 2015 to learn how to apply photogrammetry, the practice of deriving 3D measurements from overlapping sequences of digital photographs to determine the size, shape, position, and texture of objects. The results are extremely dense and accurate quantitative data with standard digital camera equipment. Recent trainees say this about the class: “Very informative, very technical, useful to people in different industries” “Wonderful, amazing, and full of applicable techniques” “In-depth knowledge sharing that is not available anywhere else” Reflectance Transformation Imaging (RTI) Training- October 13-16 Get hands-on training in Reflectance Transformation Imaging (RTI), a core practice for creating digital representations of objects. You will leave this class able to implement the digital imaging workflow, including steps to capture, process, and view RTI digital representations. Some testimonials from previous trainees: “Extremely informative and incredibly useful” “Well thought-out and thorough: the small class size was a bonus for me” “Instructors were extremely engaging and explained in a way even I could understand!”
  9. Greetings, all! I have been following this forum for some time, but only recently became a member in order to ask the community for a bit of assistance. I am a graduate student studying archaeology at the University of Colorado Boulder, and I'm putting together an interactive museum exhibit that informs the public about the many applications of aerial photogrammetry. As part of the CU Aerospace Engineering School's "Grand Challenge", this exhibit will allow guests to simulate a drone mission over a scale model of the ancient Maya archaeological site of Tikal, Guatemala. Guests will take photos using a remotely operated camera suspended over the model and will be assisted by exhibit staff in processing the data using an automated script written for Agisoft Photoscan. Our team recently set up a crowdfunding page to raise some funds to improve the exhibit and buy promotional materials. I'm not sure if this is the appropriate place to submit a request like this, but any donations to the effort would be much appreciated. Here is the crowdfunding website: http://www.colorado.edu/crowdfunding/?cfpage=project&project_id=11371 Cheers to all of you fine folks for making this forum really useful! Best, Jeff Brzezinski
  10. Here's an interesting paper about the application of multiple techniques for the study of murals and graffiti: http://www.ijcs.uaic.ro/public/IJCS-15-03_Cosentino.pdf Although it's not mentioned in the paper, one of the authors (A. Cosentino) describes an Arduino distance meter to check the position of the speedlight while capturing RTIs of the murals: http://chsopensource.org/reflectance-transformation-imaging-rti-with-arduino/
  11. manumarra

    help for a thesis

    hi, for my thesis project I want to "study" and reproduce, graffiti walls that are on the doorposts of a building, it is very interesting because you can find written from the fifteenth to the twentieth century! I was thinking of using the technique of RTI, but I wanted to ask you what do you think is the fastest method as graffiti are many, is nn have much time. graffiti is still and upright, probably'll use a flash cobra. stumentazione that I need? how many images to capture every vo graffiti? and another thing who I briefly explains the difference between hsh and pmt? thank you very much
  12. Hello, I am totally beginner in the forum and with PTM-RTI. Sorry if I’m writing in the wrong forum. My name is Miriam Luciañez Triviño, I am a Basque Government Pre-doctoral Research Fellow at the University of Seville (Prehistory and Archaeology Department). I have graduate and Master’s degrees in Cultural Heritage Conservation and Restoration, as well as a Master’s degree in Archaeology. My research is focused on the manufacture, use and exchange of ivory objects in Iberian Late Prehistory, and the conservation/ restoration of archaeological ivory. I am interested in use PTM-RTI to study ivory objects with two principal aims: 1. See the condition of the surface before and after the conservation-restoration treatments, and 2. Study the marks on the surface of the objects produced by the tools and the marks of use during the lifespan of the objects. I am really new in the field of the PTM-RTI and I have a doubt about the terminology. Reading the bibliography, I am not able to understand the difference between the terms Polynomial Texture Mapping, Polynomial Texture Map(s) and Reflection Transformation Imaging. Maybe there a very slight difference, but many questions come to my mind like: When happened the change from using PTM to use RTI, are they the same technique? Have PTM and RTI the same mathematical background? Could someone clarify me the current use of these terms, there is a consensus about it? Thank you very much. Miriam
  13. Greg Bearman sent me this reference and I may be the last to know... (!) But this paper - “3D Surface Reconstruction Using Polynomial Texture Mapping” by Mohammed ElFarargy Amr Rizq and Marwa Rahswan http://bit.ly/1k7Xyoe - from the 2013 G. Bebis et al (eds) "Advances in Visual Computing", Lecture Notes in Computer Science (LNCS), Vols. 8033, 8034, 9th International Symposium, ISVC 2013, Rethymnon, Crete, Greece, July 29-31 - SEEMS to offer a reliable pathway towards automated comparison of chronologically separated RTI's for the discovery and tracking of morphological changes in heritage materials and works of art. By generating displacement (height) maps from RTI's by iteratively improving contrast between the surface normal data extracted from the RGB values, the investigators were able to generate TRUE 3D surface models. If calibrated and distortion-corrected images are used to assemble the RTI's, these models are accurate and precise. If I'm reading past the lines correctly, this means that regardless of the alignment (tip, tilt or rotation) of the work in the capture images, the 3D models should have sufficient precision to allow for automated morphological comparison! Any body else working in this? I am hopeful that Greg Williamson and I can run our data sets through the iterative algorithms and check for precision. Thoughts? .
  14. Folks might be interested in this - it includes links to a number of interesting recent projects with RTI. A few have already appeared here in the forums, but there is some new stuff too. Check it out: http://culturalheritageimaging.wordpress.com/2014/06/19/new-work-in-rti-a-report-from-recent-conferences-and-meetings/ Carla
  15. We are thirlled to announce a brand new document for folks working with RTI. A glossary of photographic and technical terms specific to this work. Pick it up on the CHI website in the downloads area. There is also a blog post about it. As always with our projects, it was a collaborative effort. We especially want to thank Tom Malzbender, Yosi R-Poseilov, and Judy Bogart for their efforts on this document. Others chipped in ideas and definitions as well. More complete acknowledgments can be found in the blog post and in the document itself. Enjoy! Carla
  16. We are thrilled to announce the release of RTIViewer 1.1. The new features in this release are the ones most requested by our users. You can read about the new features and download the release (windows and mac versions), user guide and examples on the RTIViewer page. This software is available as free open source software. Cultural Heritage Imaging is a small independent nonprofit organization and we need donations from people like you who use and value these tools in order to keep doing the releases. Please help us by making a donation to support this work. We want to gratefilly acknowledge the efforts of Ron Bourret, Gianpaolo Palma, and Leif Isaksen for the development work that went into this release. Much of the work was performaed as volunteers. We also want to thank Judy Bogart for doing the User Guide updates and descriptions for the new features. We had some beta testers for the release, and we thank them for their time and effort to try things out and report issues. And finally, we thank all the members of the CHI team for the work tooversee the release including setting the requirements for the release, testing it and providing feedback in every phase of development, running the beta testing program, identifying and reviewing the user guide updates, and all the other tasks that go with getting something like this done and out. Enjoy! Carla
  17. We are thrilled to announce the release of RTIViewer 1.1. The new features in this release are the ones most requested by our users. You can read about the new features and download the release (windows and mac versions), user guide and examples on the RTIViewer page. This software is available as free open source software. Cultural Heritage Imaging is a small independent nonprofit organization and we need donations from people like you who use and value these tools in order to keep doing the releases. Please help us by making a donation to support this work. We want to gratefully acknowledge the efforts of Ron Bourret, Gianpaolo Palma, and Leif Isaksen for the development work that went into this release. Much of the work was performaed as volunteers. We also want to thank Judy Bogart for doing the User Guide updates and descriptions for the new features. We had some beta testers for the release, and we thank them for their time and effort to try things out and report issues. And finally, we thank all the members of the CHI team for the work to oversee the release including setting the requirements for the release, testing it and providing feedback in every phase of development, running the beta testing program, identifying and reviewing the user guide updates, and all the other tasks that go with getting something like this done and out. Much of that work was done as volunter labor as well. If you have comments or questions, or want to say nice things about the new release, please post those in the "All Viewers" forum Enjoy! Carla
  18. I want to image this object in our collection here at the Minneapolis Institute of Arts: https://collections.artsmia.org/index.php?page=detail&id=738 It's a low-relief sarcophagus that I think would image well in either RTI or using photogrammetry, but I can't decide which to use. I know the object would be easy for RTI, and I could do it in sections or its entire sides. But I think I'd like to end up with a file that's shareable outside the RTI Viewer, like an OBJ or an STL. I know we're photographing two spheres in RTIs to make our data ready for 3D modeling, but I haven't heard an update on that since I saw the CHI team in DC in 2012. With photogrammetry I would use the advice from the BLM publication and either a trial or the $179 version of PhotoScan. I think that technique would let me take the meshes of each of the object's six sides and make them into a beautiful, shareable object. I'm going to need to figure out PhotoScan in the near future regardless: should this be the object I start with?
  19. We are pleased to announce the release of new RTI materials in Spanish. Muchas Gracias to Ana Nieves and Silvia Manrique for their translation efforts. http://culturalheritageimaging.org/What_We_Offer/Downloads/Spanish/index.html There is also a "convenience URL: culturalheritageimaging.org/espanol which is linked to this page Now available are the Guide to Highlight Image Capture - version 1.1 (i.e. the older version) and the RTiViewer User Guide version 1.0.2. In addition the web page describing RTI, what it is and how it works is available in Spanish, along with links to other Spanish language blogs. We expect more Spanish language materials over time, so tell your Spanish speaking friends to bookmark this page. Want to help with translations? email to info c-h-i.org Carla
  20. John Anderson

    Flickr Forensic RTI Imaging

    Hi, My colleague Tony Kavanagh has set up a Flickr account to share RTI images, and discuss the technique. The site address is https://www.flickr.com/groups/forensicrti/ Tony is our resident comedian, and he's started by posting a humerous RTI-related image. Enjoy! John Anderson.
  21. On the Linked-In discussion group Cultural Heritage Conservation Science. Research and practice’s discussion on 3-D digital imaging and photogrammetry for scientific documentation of heritage sites and collections http://linkd.in/RZMpFj , Greg Bearman wrote the following question: “Does RTI give repeatable and quantitative set of normals good enough for looking for change? If I take an RTI set, rotate the object, let it warp a bit (flexible substrate), what do I get the second time? How do I align the datasets for comparison? what is the system uncertainty? ie if I just take repeated images of the same object without moving anything, how well does the RTI data line up. Second, suppose I take something with some topography but is totally inflexible and cannot distort(make up test object here!) and I do repeated RTI on it in different orientations? Can I make the data all the same? If you are going to use an imaging method to determine changes in an object, the first thing to do is understand what is in inherent noise and uncertainty in the measuring system. It could be some combination of software, camera or inherent issues with the method itself” I wrote back: “Hey Greg - tried sending response earlier last week but I do not see it!? Sorry. I'm on vacation until the 22nd - trying to recover and recharge. It is going well but I wanted to jot down my initial thoughts. One of my interns - Greg Williamson - is working on aberration recognition software that can recognize and highlight changes in condition captured by different H-RTI computational image assemblies - obviously taken at different times, but also with different equipment and with randomly different highlight flash positions. It seems, initally, that normal reflection is normal reflection, regardless of object or flash position and that the software correctly interpolates 3D positions of surface characteristics regardless of the precise position of the flash, because it is accustomed to calculating the highlights both the capture points and everywhere in between! Likewise, we have had promise with photogrammetry when the resolution of the images used to create the mesh and solids are similar. What may turn out to be key is a calibration set that will allow correction of the various lens distortions that would naturally come from different lenses. I know Mark Mudge at Cultural Heritage Imaging has suggested that we begin taking a calibration set before RTI capture, as we had before Photogrammetry. He may be working on incorporating a calibration correction into the highlight RTI Builder that CHI has made available. I'm sending this discussion along to the CHI forum at http://forums.cultur...ageimaging.org/ to see what others might have to add. When I return to work, I'll ask Greg to give this some additional thought.” Forum Members: any thoughts?
  22. caseycameron

    Join the Conversation

    CHI is delighted to make this new free forum available, and we're grateful to the Institute of Museum and Library Services (IMLS) for our 21st Century Museum Professionals grant, as we used a little bit of that funding to get the forums going. When you sign up for this free forum, you are joining the growing community of Reflectance Transformation Imaging (RTI) users all over the world. In recent years, new RTI tools, methods, and uses have emerged, and the list is expanding all the time. Let this forum be your learning center: How are museum conservators, computer scientists, natural scientists, photographers, and other related professional groups using RTI? What problems are they solving? What challenges are you encountering in your own RTI projects? You and your colleagues can use this forum to share your questions, insights, and issues to gain a more complete understanding of the technology and its practical applications. This conversation is for you!
  23. jasonjonesjones

    3D virtual & physical modeling

    The CHI website infers that RTIs can be used for "3D." Obvisouly the calculated surface normals and viewers do relay 3D texture information, but have you ever seen RTI/PTM data used for 3D computer or physical models? For example converting them into a conventional 3D computer model for use in CAD, animation, or other 3D computer software? Thanks, Jason
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