Rockwell-automation 5370-CVIM2 Module User Manual download pdf (Page 450)

100

101

Chapter

Chapter 8

Thresholds, Filters, and Morphology

8–11

Low threshold –– Any part of that image whose gray–scale brightness value

is lower than the low threshold value will appear white in the window. For

example, if the low threshold is 140, any part of the image whose brightness

value is lower than 140 will appear white in the window.

The interactive result of the two threshold settings is this: Any part of the

window image whose brightness value is between the high and low threshold

values will appear black in the window. (In the examples above, this would

apply to brightness values from 140 to 190.)

Dynamic Threshold Function

The dynamic threshold function can provide real–time threshold adjustments

to window tools and image tools that are configured for binary image

processing operations. This function involves using the results from a math

formula to adjust the high and/or low threshold values dynamically, during

run operations.

Specifically, when the “High” (or “Low”) box in the Thresh/Filter panel is

picked, as shown in Figure 8.8, a formula–entry keyboard appears, and the

appropriate formula can be entered at that point (by default, the current value

in the box will appear initially in the formula–entry field).

Figure 8.8 Example: Formula Entry Keyboard For Dynamic Threshold Function

Figure 8.9 (page 8–12) illustrates using the dynamic threshold function to

maintain the “Low” threshold setting, under varying light conditions, for a

window tool that is configured to count pixels.

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Rockwell-automation 5370-CVIM2 Module User Manual Page 450

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