Rockwell Automation 5370-CVIM2 Module - Manual (Page 170)

5 Chapter Chapter 6
Reference Tools
6–11
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Filter –– This field provides access to the selection of one of the ten
levels of “noise” filtering for the workpiece image. This field is active
only when the binary imaging mode is selected.
•
Width –– This field provides access to the selection of one of the five
preset reference line widths.
•
P&P Gage –– The button provides access to the “pick and
place” function for the current axis (the X–axis, in this case).
•
Threshold –– The button provides access to the threshold–
setting function, which enables you to modify the edge detection
parameters.
•
Feature –– The button provides access to the selection of the
group of reference points (“mode”), the specified reference point
(“offset”), and the search direction.
•
Done –– The button saves the currently selected configuration
settings for this axis, then exits the axis configuration panel and returns to
the reference line edit panel.
Mode Selection
When configuring each reference line axis, you must select an edge detection
mode that is appropriate for the particular workpiece image. Here is a
description of each imaging mode:
•
Binary mode –– The binary edge detection mode thresholds pixels in the
image to two states, white and black. The thresholded (or binary) image is
displayed in a region that directly surrounds the reference line in a box
called the “area of interest.” (This box serves as a visual aid for setting the
binary threshold, which is described in Chapter 8 under the Gaging Tools:
Binary Threshold Procedures heading.)
The binary imaging mode is most appropriate when the inspected
workpiece has a sharp black–and–white contrast with its background,
such as when it is backlighted.
•
Gray scale mode –– The gray scale edge detection mode detects edges
by looking for points at which the image brightness changes substantially
over a short distance. (Gray scale threshold procedures are described in
Chapter 8 under the Gaging Tools: Gray Scale Threshold Procedures
heading.)
The gray scale edge detection mode is most appropriate when the image
cannot be easily segmented using a binary threshold.
Shape Selection
This selection is inactive (shaded type) since it does not apply to reference
line tools. It is active only for the configuration of line gages.