Rockwell Automation 5370-CVIM2 Module - Manual (Page 406)

Chapter 7
Inspection Tools
7–168
Middle BG Object
The middle background object feature mode enables you to specify an edge
from among the following points along the length of the profile image:
•
The first edge (offset 0.0 ) of the background object nearest to the middle
of the profile window.
•
The midpoint ( Center ) between the first edge and the last edge of the
middle background object.
Direction
The search direction is the direction used to search for an edge along the
length of the profile image. The two available choices are these:
Normal and
Reverse .
When you pick the Direction field ( Feature selection panel) successively,
the selection toggles to the opposite direction. Thus, Normal changes to
Reverse , and vice versa.
When Normal is selected, the edge search begins at the left side of the
profile display (for the X direction) or the top side (for the Y direction).
When Reverse is selected, the search begins at the right side or bottom side.
The choice of search direction should be based upon which one leads most
directly to the specified edge. Normally, the best search direction is the one
in which a false edge is least likely to be encountered.
Offset
The current offset location is identified on the screen by an offset marker (a
red bar symbol) in the profile display. You can change the offset location by
picking the
Offset field successively.
When you pick the Offset field successively, the offset marker moves across
the profile window in the selected search direction. The displayed offset will
be one of these:
•
Fixed –– This refers to the end of the profile image at which the search
begins.
•
Center –– This refers to the midpoint between the first edge and the last
edge.
•
1.0, 2.0, etc. –– This refers to an edge specified by number.
•
1.5. 2.5, etc. –– This refers to a midpoint between two adjacent edges.