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عمومی::
معکوس مقیاس عکس
PSR = Photo Scale Reciprocal.
(ds times PSR is actual ground length of shadow.)
PSR = Photo scale reciprocal.
PSR = Photograph scale reciprocal.
To determine dimensions which are limited to length and height on such an object, it is only necessary to determine the scale of the photo at the point where the object is imaged, and to multiply the reciprocal of this scale (PSR) times the image dimension.
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