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Found 7 results

  1. 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
  2. Hello everybody, I'm new on this forum. I'm student in master's degree of photography in France. I'm actually doing my master's thesis and my subject deals with light calibration procedure for RTI acquisition with dome. To further develop my project, I need to analyse and potentially to modify PTM or/and HSH Fitter. I've ever downloaded the RTI builder and RTI viewer source code but the fitters aren't include with. Before implementing a solution myself i would know if some source code for fitters are available somewhere in any langage ? I've also discovered a new model for reflectance interpolation in a french thesis in metrology : https://tel.archives-ouvertes.fr/tel-01357821/documentthis model is called Discrete Modal Decomposition (DMD). Somebody have ever heard speaking of this modele before or of others models than those used in traditional RTI Builder (Ptm, SH, HSH) ? Thanks in advance for your answer and thanks to the Chi's team for the work they provide, this website and the forum is a gold mine for student and people interested in computational imaging for the cultural heritage domain, like me. Aurélien Vila
  3. Can you comment on the strengths of each of the fitters (PTM or HSH)? The hope is to have a better idea of when to use each. Thank you, Jason
  4. 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
  5. 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
  6. 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
  7. Taylor

    Re-focusing PTM files

    A while back, Tom Malzbender of HP gave a Google Tech Talk in which he discussed many applications of PTMs and RTIs, among which is the ability to re-focus images. He demonstrated an example using only six images of a subject taken using different focus settings (see 50:20 in this video): I was wondering if others have tried this using the PTMViewer, and could anyone describe the technique for processing and viewing the images? I'd like to take macro RTIs of an object with a lot of relief, and it would be very useful to be able to interactively refocus the images to see details, since the depth of field of the macro images is very thin. Could this capability be built into the new RTIViewer?
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