Image processing
3.1 Code reading (1D/2D codes)
SIMATIC MV500
36 Operating Instructions, 05/2019, C79000-G8976-C494-02
3.1.2.3 QR codes
Note
Maximum code dimension/unsupported code types
•
Codes with a maximum code dimension of 89 x 89 can be read.
The following code types are not supported: Micro QR code, Macro QR code.
The recognition process of the optical reader allows reliable and fast reading of printed QR
codes of good quality.
Range of application
● The range of imaging sizes ranges from 5 to 35 pixels per cell. The range is static.
● The codes can have any alignment in the image.
● The code can be printed both dark on a light background and light on a dark background.
● The viewing angle of the optical reader to the surface can be between 70° and 90°.
● The diameter of the cells must be the same size over the entire code field.
● The contrast between cells and the background must be approximately the same over the
entire code field.
● The image background must have a homogeneous brightness, for example no texture
such as stripes.
3.1.2.4 PDF417 codes
Note
Unsupported code types
The following code types are not supported: Truncated PDF417, Macro PDF417, Micro
PDF417.
The recognition process of the optical reader allows reliable and fast reading of printed
PDF417 codes of good quality.
Range of application
● The codes can have any alignment in the image.
● The code can be printed both dark on a light background and light on a dark background.
● Codes with a bar width ≥ 3 pixels and in which the height of a single row of symbols is ≥ 9
pixels can be read.
● The width of the black and white bars must be uniform over the entire code field.
● The viewing angle of the sensor to the surface can be between 70° and 90°.
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