Rockwell Automation 5370-CVIM2 Module - Manual (Page 59)

Chapter 3
Image Acquisition Parameters
3–20
Figure 3.12 Calibrate Panel With Computed and Absolute Modes Selected
All parameter fields are shown in their initial state.
Note that in the Computed calibration mode the Scale field is inactive
(shaded type), indicating that you cannot enter values into this field. It is for
display only in the
Computed mode. All of the other fields and buttons are
active.
In the Absolute calibration mode, only the Cal.Mode and Scale fields are
active, indicating that in this mode you can only enter a scale value or change
the calibration mode.
Selecting Gaging Mode (Computed Mode Only)
Each of the calibrate gages can be configured to operate in either the binary
gaging mode or the gray scale gaging mode, according to the requirements of
the application.
•
Binary mode –– The binary gaging mode uses binarization thresholds to
display and process pixels in two states, white and black. The only pixels
displayed in binary are those that directly surround the gage in a box
called the “area of interest.”
The binary gaging 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 gaging mode detects edges and
objects using the rate of change of the gray scale values of the pixels
examined by the gage.
Gray scale is appropriate when you need greater precision in linear
measurements.