Options For Image Acquisition And Image Processing - Siemens SIMATIC MV540 H Operating Instructions Manual

It allows a quantitative measurement of the print quality and allows the testing of printed 2D
codes based on a quality standard. Here, the important fact is that the printing of a data
matrix code on paper is a high-quality process.
White paper is printed with black ink to achieve a high contrast. With this background, the
threshold values for grading in the ISO/IEC 16022 standard are very restrictive because the
marking quality is so high.
Less exacting requirements are neither suitable nor useful in the printing industry. The AIM
standard identifies the following typical errors:
● Blocked ink jets
● Too much or too little ink
● Inconsistent application of the ink
● Inadequate contrast due to a combination of ink color and background color
3.3

Options for image acquisition and image processing

Image acquisition options
The image acquisition options of the optical reader were developed for a wide range of
applications.
There are three different ways of controlling image acquisition and processing:
● Individual trigger
● Auto-trigger
● Scan
Architecture of the internal processing sequence
The principle underlying the processing performed by the optical reader is a buffered
processing method in three steps:
● Image acquisition (including recording buffer)
● Decoding (including result buffer)
● Result output
Between each processing step, the optical reader has a buffer and you can configure the
size of the buffer depending on the application.
This allows the ideal throughput to be achieved in every processing step, resulting in the
maximum overall throughput for the optical reader and flexible application.
SIMATIC MV500
Operating Instructions, 06/2018, C79000-G8976-C494-01
3.3 Options for image acquisition and image processing
Image processing
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