fotograph objects behind glass

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Felix De Lille

• October 24, 2016 21:17

Hi,

I have some objects behind glass which are difficult to get right.
I heared (from a photographer) i can use a circular polarisation filter which would filter out the reflections. Is that correct? Then what can i do?

I read that horizontally rotating the camera just creates panoramic images and isn't usefull but i began rotating vertically (frog perspective/birds eye views) because my straight views weren't enough for this small room (example_positions2.JPG).

Greetings
Felix

• 504KK_NN2.jpghttps://www.capturingreality.com/forum/download/file.php?id=5042097281imageFile jpg
  KK_NN2.jpg
• 505example_positions2.JPGhttps://www.capturingreality.com/forum/download/file.php?id=5052097281imageFile jpg
  example_positions2.JPG
• 506example_positions3.JPGhttps://www.capturingreality.com/forum/download/file.php?id=5062097281imageFile jpg
  example_positions3.JPG

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  Thomas Van Damme

  • October 25, 2016 07:14

  Hi Felix,
  
  There's a good guide for photogrammetry called "Photogrammetry in Paleontology" (http://www.jpaleontologicaltechniques.o ... 12_Jul.pdf - essentially all tips and tricks in this guide can be transferred to whatever discipline, so not really limited to Paleontology). The author uses PhotoScan for processing, but a lot of this info is relevant for any photogrammetry suite.
  
  On page 6 there's a nice comparison between images taken behind glass without a polarisation filter vs with a polarisation filter. Polarisation filter definitely works, just buy one (they're cheap) and play around.
  
  Concerning "rotating horizontally" - you're allowed to rotate the camera any angle you choose (horizontally, vertically, diagonally, whatever), just don't "pan" the camera like you would for a panorama, but instead make sure you move between each shot. From what I can tell from the camera positions in the screenshots you moved between each shot so that's perfectly fine.
  
  Cheers,
  
  Tom

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  Felix De Lille

  • October 25, 2016 15:54

  Hi Thomas,
  
  Thanks, ok i will probably buy one. The doc also states difusing the light.
  I read somewhere you can move the camera against the glass and put some coating over the camera to block the light from hitting the glass.
  
  Greetings

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