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cheis

photogrammetry of objects behind glass

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I was wondering if anyone had any success doing photogrammetry on an object that is behind glass.  I'm planning on doing some tests with polarizing filters to try to remove the reflections, but I was curious if anyone else had tried this before. 

-Crystal Heis

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It depends a bit on the distance between the glass and the object.  I've used a step-up ring with some felt attached to prevent damage to the glass, and then photograph the object with the lens pressed against the glass. This avoids the reflections from the glass. Reflections from the back of the case can be removed by masking the images.  If you need more distance from the glass you can make up a black velvet "cone" to block out reflections from the front of the case... but not always practical either.

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