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Found 32 results

  1. Hello, I am new here. When I use RTIBuilder and put the images, then i get ''Highlight Denitions Not detected'', when I pass the last phase I have this error ''Improper call to JPEG library in state 200''. I have all my photos in JPG and i can't get the model to put this in RTIViewer. I checked all my photos and there are not have spaces in the names or folder. Is so important this job for my thesis. Sorry for my english, I speak spanish Thank you so much!
  2. We recently discovered that the PTM software is no longer available from the HPLabs website. We have placed both the Mac and Windows versions of the PTMFitter in a dropbox along with the license file from HP. You can get the software from here: https://www.dropbox.com/sh/jfsy0lhxu6zv4i4/AADJpq6E_GJmNw_s5C8r94CVa?dl=0 Also - many papers on PTM and RTI are by Tom Malzbender - and you can find them on his personal website: https://sites.google.com/site/tommalzbender/
  3. Hi there, I'm starting an imaging program at a maritime museum. I know from speaking to colleagues that many maritime collections are not well recorded. I'm hoping to use an RTI/Photogrammetry method to record these works, and create 3D models of them for study. Because time is a major factor, I hope to optimize my image capture through automation. I will have a smallish studio, a 50mp Canon 5DS, and an excellent computer (which I'm building, optimized for photogrammetry which should support RTI). Jorge Cano at the Factum Foundation has proposed a method using just four lights (15 degrees at NSEW) to capture up to 50nm resolution. The four images are put into Adobe Substance Maker to obtain a heightmap and that is brought into GIS software for stitching and precise height/normal mapping. Whether I use Cano's method or RTI, I would like to build a folding dome capable of imaging at least an 8in x 8in section of each artwork. (I will be visiting multiple museums, so portability is important.) I will probably build my own dome, to which I will attach lights, and which will allow me to mount my camera at the center. I need guidance on what lights to use (strobe, flash, LED, etc.) and how to trigger the lights sequentially in sync with the camera's shutter. There are a lot of references to Arduino boards, custom PCBs, etc. A company called RTI-Dome in France has a fully automated system for image capture and filing. Custom Imaging also has an automated system. I don't know whether either of these can fire LEDs strong enough for larger scale objects. Any help/direction would be much appreciated. Nick Raposo americanmarineart.com
  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. Hello, I am interested in RTI and I have started to use the method involving 2 spheres. However in some case, there are physical difficulties for taking photos. I would like to know if I create a 3D model (with an Artec Scanner by example), is there any applications to convert 3D model to RTI ? My 3D model is of course of a surface. Regards Bremard Nicolas
  6. Hi all, Recently we have released to the public our Photogrammetry&RTI project that we have been working for over 2 years. We were inspired by some of your posts here with the dome approach and we decided that we should share with you our results. Our aim was to create a cheap, affordable photogrammetric modeling as well as RTI imaging device, that anyone can create and does not cost thousands of euros. Because of that, we needed multiple cameras, led lights and a step motor, which allowed us to rotate an object placed on the rotating table and take photos around it. As our device heart we used RaspberryPi 4 and 4 ArduCAM cameras. We were aiming at small objects, artifacts which are not bigger than 100-120mm. In the first iteration of our device we have used a small (32cm in diameter) dome (an aluminum bowl from IKEA….) with 40 led lights and 4 cameras. This version was successfully tested on Cyprus about 2 years ago where we gathered extremely valuable experience. In the second iteration we decided to leave the bowl approach and create a spider-like shape, with 10 arms for the led strips (12 leds on each) and 1 seperate arm for the cameras. It is much more mobile than the previous version as we can disassemble it and because of that it is easier to work with. Because in the first iteration we noticed that depth field was an issue, we decided to go with higher resolution cameras that have motorized focus, so we can use focus stacking method to increase our depth field. For the led strips we used flexible pcb which we connected together with FPC cables. We are controlling them through our shield that goes on the top of the raspberry pi 4. Below I am sending 2 links to my LinkedIn posts as I can not upload images here. https://www.linkedin.com/posts/marcin-k%C5%82%C4%99bowski-458bb5146_photogrammetry-rti-textured-activity-6766022368184860672-n2MF https://www.linkedin.com/posts/marcin-k%C5%82%C4%99bowski-458bb5146_photogrammetry-rti-ptm-activity-6766744323838013440-z9yn Thanks for inspiration guys and let us know what you think about our device. I am sure we will share some results as we will start testing and creating more RTI images for the objects. Marcin
  7. Hello, I would like to integrate the rtibuild in a script. Is it possible to call rtibuilder from command line and passing image folder and lp file as arguments ? Thank you Nicolas
  8. Hi! I am working with a student who has downloaded RTI builder on her computer and continues to get an error message: "To open "RTibuilder-v2.0.2" you need to install the legacy Java SE 6 runtime." She can click 'ok' or 'more info.' Clicking 'more info' leads us to the Java website but when she tries to download the selected Java she can't install as it says "Java for macOS 2017-001 can't be installed on this disk because a newer version of this package is already installed." We tried completely uninstalling and reinstalling the newest version of Java and completely uninstalling and reinstalling RTI builder. We got the same errors. RTI viewer downloads and runs fine. She has an early 2015 macbook running OS 10.15.17. Any help greatly appreciated! Thank you! Jackie
  9. I was wondering if anyone here had any experience with how to use RTI's to make a to scale drawing of an object, particular drawings of artifacts that can be used in publications. Any advice or tips would be greatly appreciated!
  10. 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
  11. On Windows 10 pro computer with 16 gig ram, Intel CPU i7 processor, .rti files made with RTI Builder do not open in RTI Viewer. The files begin to open, but when the progress bar is about 20% finished, RTI Viewer returns an error "[filepath] is invalid Internal format unknown" Created .RTI files are not tiny, between 50 and 100 mbytes in size. RTI File is created without indication of error. Same problem on 2 different computers. Running as admin and running in Win7 compatibility mode does not help.
  12. 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
  13. 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!
  14. 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?
  15. 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
  16. 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
  17. 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!”
  18. 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
  19. 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/
  20. 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
  21. 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
  22. 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? .
  23. 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
  24. 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
  25. 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
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