Synthetic Aperture / Measuring Opening - REA VeriCube Operating Manual

10 Synthetic aperture / measuring opening

Under aperture or opening we normally understand the diaphragm opening of a
camera lens. In this context, this is not the case. The diaphragm opening of the lens
of the REA VeriCube has a fixed presetting from the plant, which achieves the best
compromise between the maximum possible depth of field and the minimum possible
diffraction effects.
The synthetic aperture simulates the spot of light of a laser scanner. This takes place
through mathematical filtering of the recorded measurement image. Depending on
the aperture used in the code testing, the measurement results can vary. The
synthetic aperture is always automatically set to 80% of the module width of the
tested 2D matrix codes.
Alternatively, the synthetic aperture can also be set manually
The synthetic aperture forms an optical filter from the picture processing view, which
causes certain blurring. This makes sense for suppressing the smaller and up to the
smallest distortions in the picture, which are not relevant for verification.
The symbols, which show many distortions, can disrupt the automatic determination
of the synthetic aperture. When this is the case, the measurement results oscillate or
there are invalid measurements. In this case, a manual determination of the
synthetic aperture is recommended (under the condition that the symbols always
have the same module size).
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REA VeriCube Operating Manual Version 2.16 – 11/2020 Page 62 of 119