STEREOMICROSCOPE PHOTOGRAMMETRY FOR THE MEASUREMENT OF SMALL OBJECTS

H. L. Mitchell; R. G. Chadwick; J. F. McCabe

doi:10.1111/j.1477-9730.1989.tb00680.x

STEREOMICROSCOPE PHOTOGRAMMETRY FOR THE MEASUREMENT OF SMALL OBJECTS

H. L. Mitchell, R. G. Chadwick, J. F. McCabe

Dentistry

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

A stereoscopic microscope has been used in combination with the body of a 35 mm camera to obtain stereophotographs, at scales up to 6:1, of objects only a few millimetres in size. Subsequent stereocomparator observations have been used to deduce height differences on the objects 10 a precision, for the mean of five sets of readings, of ±0.01 mm for closely spaced points. Using more widely separated points, the precision was estimated to be ± 0.05 mm. Depths were computed using × parallaxes after a number of parameters were fixed by calibration. The large convergence angle of the microscope axes was a crucial parameter; rotations about the camera axis were found to be significant variables.

Original language	English
Pages (from-to)	289-299
Number of pages	11
Journal	The Photogrammetric Record
Volume	13
Issue number	74
DOIs	https://doi.org/10.1111/j.1477-9730.1989.tb00680.x
Publication status	Published - Oct 1989

ASJC Scopus subject areas

Engineering (miscellaneous)
Computer Science Applications
Computers in Earth Sciences
Earth and Planetary Sciences (miscellaneous)

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10.1111/j.1477-9730.1989.tb00680.x

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abstract = "A stereoscopic microscope has been used in combination with the body of a 35 mm camera to obtain stereophotographs, at scales up to 6:1, of objects only a few millimetres in size. Subsequent stereocomparator observations have been used to deduce height differences on the objects 10 a precision, for the mean of five sets of readings, of ±0.01 mm for closely spaced points. Using more widely separated points, the precision was estimated to be ± 0.05 mm. Depths were computed using × parallaxes after a number of parameters were fixed by calibration. The large convergence angle of the microscope axes was a crucial parameter; rotations about the camera axis were found to be significant variables.",

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AU - Chadwick, R. G.

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AB - A stereoscopic microscope has been used in combination with the body of a 35 mm camera to obtain stereophotographs, at scales up to 6:1, of objects only a few millimetres in size. Subsequent stereocomparator observations have been used to deduce height differences on the objects 10 a precision, for the mean of five sets of readings, of ±0.01 mm for closely spaced points. Using more widely separated points, the precision was estimated to be ± 0.05 mm. Depths were computed using × parallaxes after a number of parameters were fixed by calibration. The large convergence angle of the microscope axes was a crucial parameter; rotations about the camera axis were found to be significant variables.

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STEREOMICROSCOPE PHOTOGRAMMETRY FOR THE MEASUREMENT OF SMALL OBJECTS

Abstract

ASJC Scopus subject areas

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