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Vision Sensor SBSI/SBSC-EN, 8062650 - 1607b - 13/09/2016
Vision Sensor Manual
Fig. 142: Detector 2D Code, tab Quality
Settings in tab Quality
Parameters Functions
Quality
param.
Quality parameters are additional information for rating the printing quality of the code.
There are two different standards: AIM DPM-1-2006 and ISO/IEC 15415. Quality
parameters are eight single parameters, the definition of the respective elements is as
follows:
Q1 Overall quality
Q2 Contrast
Q3 Modulation
Q4 Fixed pattern damage
Q5 Decode
Q6 Axial non-uniformity
Q7 Grid non-uniformity
Q8 Unused error correction
Q9 Mean light
The overall quality is the minimum of all individual grades.
The contrast is the range between the minimal and the maximal pixel intensity in the data
code domain, and a strong contrast results in a good grading.
The modulation indicates how strong the amplitudes of the data code modules are. Big
amplitudes make the assignment of the modules to black or white more certain,
resulting in a high modulation grade.
The fixed pattern of both ECC200 and QR Code is of high importance for detecting and
decoding the codes. Degradation or damage of the fixed pattern, or the respective quiet
zones, is assessed with the fixed pattern damage quality.
The decode quality always takes the grade 4, meaning that the code could be decoded.
Naturally, codes which cannot be decoded cannot be assessed concerning print quality
either.
Originally, data codes have squared modules, i.e. the width and height of the modules are
the same. Due to a potentially oblique view of the camera onto the data code or a
defective fabrication of the data code itself, the width to height ratio can be distorted.
This deterioration results in a degraded axial non-uniformity.
If apart from an affine distortion the data code is subject to perspective or any other
distortions too this degrades the grid non-uniformity.
Summary of Contents for SBSC-EN
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