12-05-2014, 06:21 PM
I don't have photogrammetry software. The measurements I make, with my pixel counting software, are all exclusive within each photograph. In all (but one) of my measurements there is either a scale in the actual picture, or something of a known size, at a similar distance from the camera lens, with which to compare.
The problems that I have reported with measurements are when what is purported to be one item appears to be one size in one photo (as measured against other objects a similar distance from the camera lens in that photo) and a different size in another picture (as measured against other objects a similar distance from the camera lens in that picture) No 3d trickery involved.
All along I have assumed that the photographs (such as in NARA) were not made with a fish-eye lens or otherwise deliberately distorted. Perhaps that assumption is naïve.
The problems that I have reported with measurements are when what is purported to be one item appears to be one size in one photo (as measured against other objects a similar distance from the camera lens in that photo) and a different size in another picture (as measured against other objects a similar distance from the camera lens in that picture) No 3d trickery involved.
All along I have assumed that the photographs (such as in NARA) were not made with a fish-eye lens or otherwise deliberately distorted. Perhaps that assumption is naïve.