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Everything posted by leszekp

  1. I had the same issue with Windows Defender on one of my computers. You'll need to set an exception/exclusion for this file: https://support.microsoft.com/en-us/help/4028485/windows-10-add-an-exclusion-to-windows-defender-antivirus
  2. I've been using a Yuneec Typhoon H hexacopter (12 MP fixed focus camera) for recording archaeological sites, and have gotten excellent results. I expect that the Inspire 2 would do at least as well, if not better. For high accuracy, you will need to have ground control points measured with high accuracy (Total station, RTKGPS, or equivalent).
  3. Take a photograph of the sphere,and load it into Photoshop. Use the Ruler tool to measure the diameter in pixels (you may need to right-click on the ruler and select "Pixels" as the scale).
  4. You might try shooting at a slightly higher ISO (up to 400); you'll get faster shutter speeds to reduce the blur, and the added noise is likely to be small. You might also try processing the dense cloud at UltraHigh to get better resolution for your models. Using a camera pole can get you higher camera elevations, for more angles. With a faster shutter, you can try holding the camera pole obliquely to get good angles above the scene without disturbing the area.
  5. Got an email today from Ashira at the Met. Videos of the presentations from last March's RTI symposium are now online. https://www.metmuseum.org/about-the-met/conservation-and-scientific-research/projects/rti-symposium
  6. This is the kind of error that pops up if the proper input variables have not been passed to the PTMfitter program. You might try running RTIBuilder as an admin (right-click on the program icon, and choose Run as Administrator); this has fixed similar problems for me.
  7. Idiotically, you can't set exclusions in Defender.
  8. I have Windows Defender as my antivirus on my laptop, and today it decided that RTIBuilder is a dangerous virus and deleted it from my computer. Heuristic virus diagnoses are very annoying. If you have Windows Defender, be on the lookout for this. Main computer has BitDefender, which has no problem with RTIBuilder; will probably disable Windows Defender and install BitDefender to resolve this problem.
  9. Do you have Java installed on your system? RTIBuilder needs Java to run.
  10. That used to be the case, but the Desktop is no longer in "Documents and Settings"; it's now in Users\<yourusername>\Desktop.
  11. Couple of quick suggestions: 1. Make sure there are no spaces in your file paths. 2. Make sure the pictures have a lower-case "jpg" extension, not "JPG"
  12. Take a look at this site for answers and ideas: https://hackaday.io/project/11951-affordable-reflectance-transformation-imaging-dome And these three blog posts on building a dome using the plans from the site above: http://labs.dash.umn.edu/aisos/an-introduction-to-automated-rti/ http://labs.dash.umn.edu/aisos/building-an-automated-rti-dome/ http://labs.dash.umn.edu/aisos/building-an-automatic-rti-dome-wrapping-it-up/
  13. Thanks, Carla. Will stick to regular color correction (custom white balance and color checker card) if necessary.
  14. I haven't been using the color correction option for the hshfitter, since it's not that critical for my main interest (lithic tools). Thought I'd give it a try - checked the Advanced Options box, selected a gray card image (jpg), and tried processing an RTI data set. I got the following error message: "Number of files found given prefix : 48 Light positions on file (0) does not match the number of files for viewpoint (48) Problem while reading command line arguments" If I process with Advanced Options unchecked, it works fine. This is on a Windows 10 system, lots of RAM and processing power. I tried using color correction with hshfitter directly in the command line, but that was unsuccessful as well. In the latter case, I probably wasn't structuring the command correctly - the syntax and examples you get when you type "hshfitter" on the command line were difficult for me to understand, and I couldn't find any other documentation.
  15. Pretty cool! Will have to give it a try.
  16. Agisoft has a page with recommended hardware specs: http://www.agisoft.com/downloads/system-requirements/
  17. I've started a Hackaday page on how to build an RTI dome like the ones I've used for this work on lithic artifacts. It can drive 3W/1A LEDs, so should be able to light up a dome at least a meter in diameter (maybe even bigger, depending on how long an exposure time you're willing to tolerate). Still in the early stages, but I've got a fairly complete parts list up, along with some background on the design; instructions should start going up shortly. Comments and suggestions welcome. Open Hardware license, Creative Commons on the instructions, software when released will be under GPL v. 2.0.
  18. Somebody else can jump in and correct me if I'm wrong, but I believe the 2-4x distance rule-of-thumb is a minimum distance, not an absolute requirement. The further away the light is, the larger the area of relatively uniform lighting, which is a good thing for RTI.
  19. Thank you! I guess this makes sense, but the lack of documentation doesn't make this intuitively obvious. So I have multiple components, and I'd like to merge them using manually-added image control points. Is this possible with the current version? The help file says yes, but I'll be damned if I can figure it out how to add a control point.
  20. Well, that was entertaining. Ran a large set of photos (about 2000), took about 30 hours for full processing. got a decent looking model, saved the project. When I reloaded it, the mesh, texture and the photo alignments were gone, even though there's a large set of data files associated with the project. Fortunately, I had exported a mesh and an orthophoto, but I'm not going to waste any more time on this program again until it's in better shape.
  21. Reality Capture (RC) is from the team that developed CMPMVS, an excellent multi-view reconstruction program (still available in an earlier version for non-commercial use - works well with VisualSfM as the front-end for photo alignment). Available as a free beta through 1/31/16 at their website. Played with RC a bit - interface takes some getting used to, help file isn't quite complete yet. Models I've generated are comparable to or slightly inferior to those of Photoscan, but this may improve as I climb the learning curve. Seems as though Photoscan is better at photo alignment than RC. Works with laser scans as well. One big thing in RC's favor is that it's fast, at least several times faster than Photoscan. Says it supports distributed computing, but no info yet on how to get that to work. Edit: Requires an nVidia graphics card wtih CUDA capability.
  22. I use CHDK with my dome RTI system to automatically fire the shutter via the USB connector. Unfortunately, it does nothing for the lens creep issue. I've tried the RAW option in CHDK, but it doesn't use the built-in lens distortion correction capabilities of the camera, and the result is so heavily geometrically flawed that it's pretty much unusable/uncorrectable. Photoshop/Lightroom don't support RAW from CHDK.
  23. I own two fairly recent Canon point-and-shoot models, and both digitally process images to compensate for most of the lens distortion at different zoom levels. One of them also shoots raw, and Lightroom has a profile that corrects for the distortion as well. But both also have a problem with lens creep, where the image shifts as you take successive photos, even though the lens is stable. I have to shoot about 20 dummy shots to eliminate this effect, but then the image is stable unless the lens zoom is changed again.
  24. Don't know if anyone else saw this, but one of this year's MacArthur Foundation fellowship winners, Dimitri Nakassis, uses RTI prominently in his work. https://www.macfound.org/fellows/940/
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