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Chapter 9 Vision Manager
Note
What is an edge?
Caution
Here the Target window range can have the following shapes.
• Straight line (scan = 0 or 1)
• Rectangle (scan = 0 or 1)
• Sector (scan = 0 or 1)
An edge is a brightness transition in
the specified window, a boundary
between dark grays and light ones.
The DENSO µVision board offers
edge detection based on brightness
levels or on areas. For brightness
levels, there is also a choice of ab-
solute and relative levels for detect-
ing transitions. Specifying absolute
defines transition as crossing the
specified brightness level. Specify-
ing relative defines transition as a
change in brightness or surface big-
ger than the specified threshold.
Position
: Edge detection point
Window Edge
Absolute
Brightness level
Brightness
level
Relative
Brightness
Brightness
Brightness
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