Image processing
4.1 Reading code (1D and 2D codes)
SIMATIC MV420 / SIMATIC MV440
34 Operating Instructions, 04/2013, A5E02371045-06
4.1.2.2 Performance characteristics when reading qualitatively good data matrix codes
Note
Changing to time-saving image acquisition with half resolution
If the cells are larger than 10 pixels, change to time-saving image acquisition at half
resolution. This change is also useful at high object speeds.
The "standard" recognition processes of the reader allow reliable and fast reading of printed
data matrix codes of good quality.
Range of application
● In this mode, the read rates achieved are higher than those when reading complex
codes.
● The range of image sizes is from 1.5 to 35 pixels per cell. The range is static.
● The cells do not overlap or only slightly, nor are the majority isolated.
● The distortions are minimal, for example due to installation of the reader at an angle.
● There are no or only a few foreign objects in the area of the code.
● There are no interference patterns (grooves, granularity) in the area of the code.
● Fluctuations in contrast are slight.
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