Image processing
4.1 Reading code (1D and 2D codes)
SIMATIC MV420 / SIMATIC MV440
Operating Instructions, 04/2013, A5E02371045-06
39
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 height of 25 pixels and height/length ratio ≥ 0.15 are read.
● The viewing angle of the sensor to the surface can be between 80° and 90°.
● The codes must not be printed on a curved surface.
● The quiet zone around the code must be undisturbed.
● Code and background must have a homogeneous brightness.
● The following limit values for the bar width must not be exceeded:
– Code 39: 8 pixels
– Code128: 12 pixels
– Int. 2/5: 5 pixels
– EAN 13/UPC-A/UPC-E/EAN 8: 12 pixels
– Code 93: 14 pixels
– Codabar: 9 pixels
Range of applications for "low" codes
For special applications in the printing industry, optimization is available for 1D codes with
extremely low bar heights. This can be activated in the options on the "Speedup" tab.
The range of applications for 1D codes (see "Range of applications") is to be limited with the
following supplementary conditions:
● Bar height must be > 20 pixels.
● Bar height must be > twice the minimum bar width (1x width).
● The codes must be parallel to the axis (horizontal or vertical): Tolerance < ±5°.
● The print quality must be extremely good.
● The minimum quiet zone must be > 5.5 x the minimum bar width (1x width).
See also
Options (Page 207)
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