Rockwell-automation 5370-CVIM2 Module User Manual download pdf (Page 429)

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Chapter

Chapter 7

Inspection Tools

7–191

The Width box enables the selection of one of several sub–gage widths. The

default width setting is 1 pixel, but a wider setting may be necessary if a

particular edge is somewhat uneven. In that case, a wider setting has the

effect of smoothing an uneven edge by calculating its average location across

the width of the gage.

The kernel setting determines the number of consecutive pixels over which

the brightness change is evaluated. At a given point, the brightness change is

evaluated over a distance equal to two times the kernel setting, plus one.

The kernel setting is 3 by default. This means that an edge will be detected

whenever a “rising” or “falling” brightness change occurs (as determined by

the Thresholds settings) within three consecutive pixels along the length of

the gage. A higher setting may be necessary to detect an edge where the

brightness change is more gradual.

The kernel value can be adjusted by sliding the cursor up or down, or by

clicking the “box” containing the kernel value. In that case, the calculator

pad will appear, and a value between 1 and 16 can be entered.

For more detailed information about kernels, refer to the Threshold and

Kernel Settings section on page 8–6.

When you pick the Threshold field in the multiple gages tool edit panel, the

Gage Threshold panel appears, as shown in Figure 7.153.

Figure 7.153 Gage Threshold Panel

Threshold Functions

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Rockwell-automation 5370-CVIM2 Module User Manual Page 429

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