ABB PickMaster Twin - PowerPac, Руководство по применению

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4.3.9.2 Configuring a geometric model with PatMax
Introduction to the geometric model PatMax
PatMax is a pattern location search technology. This tool measures:
• Position of the pattern.
• Size relative to the originally trained pattern.
• Angle relative to the originally trained pattern.
PatMax differs from other pattern location technologies as it is not based on pixel
grid representations that cannot be efficiently and accurately rotated or scaled.
Instead,
PatMax uses a feature based representation that can be transformed
quickly and accurately for pattern matching.
When creating a pattern the following things should be considered.
• Select a representative pattern with consistent features. Reduce needless
features and image noise. Train only important features. If necessary, export
the image and use an external program to erase noise.
• Larger patterns will provide greater accuracy because they contain more
boundary points to resolve at run-time.
• High frequency features are more significant at the outer edges of the pattern.
Models can be classified with the function Inspection I . A model can either be
defined as accepted or rejected, see Item Properties on page 102 .
To increase the contrast in images where parts have similar grayscale tone, it is
possible to use color filtering. See
Using color vision on page 289 .
There are several parameters that can be adjusted to make an efficient model. The
configuration is done in the
PatMax Model Configuration dialog and the result is
displayed in the PatMax Image and the PatMax Result dialogs:
Illustration PatMax Model Configuration
xx1900000557
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246 Application manual - PickMaster® Twin - PowerPac
3HAC064218-001 Revision: B
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4 Working with PickMaster PowerPac
4.3.9.2 Configuring a geometric model with PatMax