Edge detection in petrographic images

The automatic detection of mineral grain boundaries in images obtained from a polarized‐light microscope requires special techniques. Observations in both plane‐ and cross‐polarized light may be necessary and the section must be rotated relative to the plane of polarization of the microscope to see all the grain boundaries. In computer‐based microscopy this can be accomplished by the sequential accumulation of individual images captured from one microscope field of view with different polarizer orientations.

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