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Everything posted by cdschroer

  1. I responded to Alan off the forums about services available at CHI. We do provide imaging services, just write to us info at c-h-i.org Carla
  2. As far as I know there are no tools to do this. It's trickier than it seems. There is a simple case and a more complex case. In the simple case, with a relatively flat subject like a painting or bas relief - if you overlapped each RTI by about 20% it's theoretically possible and according to some of the graphics researchers I've talked to not that hard. If you have a more complex surface, such as something more sculptural, like petroglyphs going around the edge of a rock face, then it is a much more complex problem. We have shot RTIs of an area of about 2 meters across as a single RTI. The level of detail you get is based on the resolution of your camera. Depending on what you are looking for, it may be sufficient. Sorry I don't have a better answer for you. Carla
  3. It's hard to answer this without understanding more about the subject and about your lighting setup. I'l give some general advice though. The key thing you want to avoid is moving shadows. The matching software in photogrammetry can try to match pixels using shadow lines, and if these are moving around, you may not get a good alignment, or a bunch of stuff may be in the wrong place. We recommend using soft boxes or umbrellas on your lighting (or diffusers, depending on your lights) Then look in terms of what is lit, and whether you have shadowed areas, and how those are affected as you move around the subject. I'll also note that you should plan to do more than one circuit around your subject. Three circuits is kind of a minimum to get enough look angles (redundancy) and more may be required, depending on the size and shape of your subject, how far away you are with what field of view, etc. Good luck! Carla
  4. Hi, This question is really specific to Agisoft Photoscan, and you should post it in their forums: http://www.agisoft.com/forum/ We don't want to replicate that forum, or become a photoscan forum, so we try to stick to more general photogrammetry questions, and issues of good capture methodology, equipment, lighting, etc. While Photoscan does get mentioned here, questions specific to that software should be asked in their forums. Thanks, and good luck! Carla
  5. Thanks! Good to know. I haven't worked on a Windows machine in a while. It's still important to note that you can't have spaces anywhere in the full path to your files, not just your image file names. A quick way to look at that, if you get errors is to open the .lp file which is in the Assembly-files folder. You can see the full path being used, and look for spaces or special characters. Carla
  6. One more thing to check is whether there are spaces anywhere in the file path - not just the filename. You can't use spaces. That means that on a Windows system, you can't use the desktop because it s in a folder called "documents and settings" (with spaces) I can't tell from your description if the files aren't loading into RTIBuilder at all, or whether you can't "execute" the build of the images in the last screen. Please describe exactly what happens, what screen you are on, and whether you get any error messages. Carla
  7. Take a look at our photogrammetry technology page on our website. It covers some basics. We are about to release some additional updates to that page with more tips for how to shoot a good photogrammetry sequence. http://culturalheritageimaging.org/Technologies/Photogrammetry/ We also offer photogrammetry training - the next course is in San Francisco on September 25 - 28, 2017. More info about the class can be found here: http://culturalheritageimaging.org/What_We_Offer/Training/photogram_training/index.html Carla
  8. The viewer works on all platforms that support WebGL and HTML5 enabled browsers. However, to prepare the image data for your server - you have to run a utility over it. That utility only runs on Windows at this time. So, if you want to post RTIs in a way that uses the viewer - you need access to a Windows machine to prep the files. Your users can be on any platform. Carla
  9. Dear Aurélien, Welcome to the community! The source code for the HSHfitter IS included with the source code for the RTIBuilder. If you request that code from CHI, we can provide it to you. (write to info at c-h-i.org with your request) The source code for the ptmfitter belongs to HP and is not available under an open source license. I believe it has been given to some researchers in the past by Tom Malzbender and Dan Gelb (the original authors/inventors) but neither of them is at HP any more. Carla
  10. Hard to say without seeing your setup and the subject. Sometimes a larger sphere and just setting it below the edge will work fine. Sometimes you have to place it on the matte or similar area outside the area you are interested in at the same height. In that case you should set the spheres a bit away from the area you care about to reduce shadowing on the area. And finally, it is possible to get truncated spheres, you want about a 3rd of the sphere removed. We have some that we purchased ages ago. I don't have a link, and they were quite pricey, so we didn't feel we could put them in the kit. You might be able to find a machine shop that could modify some ball bearings for you, if you will be doing a lot of this kind of work. Good luck! Carla
  11. First question - can you open RTiViewer, with no RTI? In other words does it start when you double click on it? If so, the issue may be that you are trying to open an RTI file that is too big for the computer you are opening it on. So, first try starting RTiViewer with no file, then open a small RTI. If those work, then the issue is likely the size of the RTI you are trying to open. There are other discussions of RTIViewer failing with large files on the forums. Carla
  12. A couple of things to note regarding sphere size: 1. While the capture guide and our training talks about the pixels in the diameter of the sphere, RTIBuilder reports the radius - so you need to double it to get the diameter. 2. As you saw, the software will work if you are below the recommended number. The issue is that your light positions aren't as accurate, because you don't have a pixel for each degree on the sphere. For interpretive purposes in the viewer, you wouldn't be able to tell the difference. For some applications where normal accuracy is being quantified, it could make a difference. Carla
  13. There isn't a hard limit that is coded into the software. We are aware that it is more likely to fail on Windows with large files than on Macs. Usually the problem has been in the fitter software, but you are saying you can't open the files in RTIBuilder (RTIBuilder calls the fitters later in the process - see the glossary for definition of fitting) We have a 50MP camera that we use regularly for RTI, and we haven't had problems running the images on our Mac computers. We haven't tried anything at 100MP. I'm guessing that the finished RTIs wouldn't be able to load on most computers, so it might be worth down-sampling to smaller JPEGS and building from there. Carla
  14. I've never seen this error. The message indicates it's trying to run the hshfitter application from where your image files are stored. I'd check the path for the hshfitter in the final "execute screen." There is a place at the top for the hshfitter path. You shouldn't need to set it after installing the rtibuilder software, but if this got changed it could account for the problem. It might be easiest to fix this by reinstalling if the path there looks something like the path you show above. Carla
  15. Sometimes the RTI is not made correctly. This is more likely with the hshfitter on Windows machines. So there is a file, but it's only maybe a few k and not a proper file. So, first check the file size on the RTI that is not loading and see if this could be it. The problem is sometimes caused due to a permissions issue where the fitter can't write the file. The HSH fitter uses a cache while it's calculating, and if it can't write that file (which is in the directory where you installed the RTiBuilder) then it can fail like this. So, please send a bit more info about what machine you are using, and whether the full file was written. A 2nd order HSH from 20MP images would be about 150MB (depending on cropping) Carla
  16. The Mac Sierra issue was addressed in the FAQ forum. I'm adding it here also. The problem is more completely described over in the FAQ area: MacOS X Sierra does remove the run apps from "anywhere" option. Here's an article with a couple of options for how to get around this: http://dispatchist.c...tions-anywhere/ I can't vouch for this site, but one of the options is pretty straightforward. The more permanent fix involving a command line action in a terminal, you might want to do a bit more research on before trying. Carla
  17. Ok - wow, this looks like a problem. MacOS X Sierra does remove the run apps from "anywhere" option. Here's an article with a couple of options for how to get around this: http://dispatchist.com/macos-sierra-gatekeeper-run-applications-anywhere/ I can't vouch for this site, but one of the options is pretty straightforward. The more permanent fix involving a command line action in a terminal, you might want to do a bit more research on before trying. Carla
  18. We have seen the damaged file reported before (though the file is not damaged). Usually going to system preferences and changing the security settings to allow the software "from anywhere" to run will fix the problem. Then you can change the setting back, once RTiBuilder is running. You will need an administrator password to make this change. Carla
  19. The color correction option was an experimental thing, and really was to solve a problem with wildly varying color temperatures in a research dome. We recommend not using any of the advanced options, because they aren't well documented and have known errors. Carla
  20. We are pleased to announce the next photogrammetry training class at Cultural Heritage Imaging in San Francisco for January 30 - February 2. Learn more and register here: http://culturalheritageimaging.org/What_We_Offer/Training/photogram_training/index.html Read blog posts from 2 different attendees about their training experiences during 2016: https://culturalheritageimaging.wordpress.com/2016/02/22/four-days-with-chi-reflections-on-januarys-photogrammetry-training/ http://www.conservationaffair.com/blogreel/everything-is-better-in-3d Hope you can join us this winter! Carla
  21. Great! A couple of CHI folks will be at CAA Atlanta, and we'll look for this. Carla
  22. Eleni - That link seems to be broken - can you check it and submit a corrected one? Thanks - interesting topic! Carla
  23. We use the X-Rite passports and the small color charts (which are no longer made) We also use the Color Card SG (larger, more colors, more expensive) for projects where the color is really important, like our recent project with the Diego Rivera Mural at City College in San Francisco. We can use that for profiling, or for checking our results using the free Delt.ae website. X-rite produces the old Gretag-Macbeth charts (included int he Passport and as a separate large chart) - they bought the rights to them. Carla
  24. Erin - Sorry for the delayed reply - I did not see this post come through. No, I have never seen this error. I've seen RTIBuilder hang and not complete, but not the behavior you describe. Sorry I can't be more helpful. Maybe someone else can chime in. The fact that you are having other problems with RTIBuilder makes me think that your install somehow was modified. Did you try reinstalling the software? I know that's what people say when they can't figure out what is going on. Guilty. Carla
  25. Thanks for sharing Nico - I hope it sparks some discussion, and as you say, it's always good to have a list to start from. One quick note is that it's the cropped sensor cameras (such as the Canon Rebels) that are "more zoomed in" and it is harder to go wide with those cameras. the 6D is a full frame sensor camera, so a 24mm lens acts like a true 24 mm lens. We find that the fixed 24mm lens works well for photogrammetry and is our primary "workhorse" lens. I'll note that Canon makes a less expensive (EF-S mount) one that only works on the APS-C (cropped) sensor cameras. with the 6D you need the EF version. (Which will also work on the cropped sensor cameras). There is one for ~$550, and a much more expensive "L" lens. the $550 is great for photogrammetry. There are other flash options and flash triggering options depending on your budget. The 600EXII gets good reviews (we have older flash units) If you get something less expensive without the built in radio trigger, then you have to trigger it with Pocket wizards (on the high end) or there are less expensive alternatives such as the PaulC Buff Cybersync trigger sets. I haven't used them, so can't speak to the reliability, but we have other gear from them that we are happy with. http://paulcbuff.com/cybersync.php I don't see a ball head on your list. You definitely need that for mounting the camera. Lots of options there at different prices. You will also want a monopod for photogrammetry - and sometimes RTI, for moving a light around in certain scenarios. I see the wonderpole - but that may be unwieldy for photogrammetry captures where you just need to move the camera around in smaller areas. One option is the Mefoto tripod which comes with a ballhead, and also can be converted to a monopod. https://www.bhphotovideo.com/c/search?Ntt=mefoto+tripod&N=0&InitialSearch=yes&sts=ma&typedValue=&Top+Nav-Search= We have only used one of their monopods, and we are happy with it. There are heavier duty tripods, but this series is worth a look because you get a lot for that pricepoint. Also don't forget SD cards,a remote trigger (https://www.bhphotovideo.com/c/product/164276-REG/Canon_2476A001_Remote_Switch_RS_80N3.html ) and an SD card reader. Plus portable USB 3 drives for backups on the road. We like this one: https://www.amazon.com/Seagate-Portable-External-Storage-STDR4000100/dp/B00ZTRXFBA?th=1 But there are lots of other options. Lots of options, and lots of different things you can make to work depending on your subjects, goals and budget. I'd be happy to hear the experience of others on the forums. Carla
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