FIELD: instrument making.
SUBSTANCE: according to the proposed method, two images of the object are shaped in series by means of an objective lens for further digital processing consisting in shaping of a differential image and its threshold processing. A parallel flat plate is installed at a convergent optical beam at shaping of the first focused images of objects and background in the objective lens of optical path. At formation of the second defocused image and background at a convergent optic beam there installed is a parallel flat plate with the thickness different from that of the first one. Differential image is shaped by subtraction of the second image from the first one.
EFFECT: providing maximum signal-noise ratio and excluding the influence of geometrical noises.
1 dwg
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