Rockwell Automation 5370-CVIM2 Module - Manual (Page 302)

Chapter 7
Inspection Tools
7–64
Figure 7.53 illustrates the effects on the inspected object that Absolute and
S.Threshold LUTs have when using the Sobel X kernel.
Figure 7.53 Example: Effects of Absolute and S.Threshold LUTs With Sobel X Kernel
Inspected object using
Absolute LUT
Inspected object using
S.Threshold LUT
Sobel Y Kernel –– The coefficients in the Sobel Y kernel are arrayed in a
3x3 matrix, as follows:
2 1
0
–1
0
–2
1
0
–1
Figure 7.54 (page 7–65) uses the inspected object shown in Figure 7.52 (page
7–63) to illustrate the effect of the
Sobel Y kernel.
In Figure 7.54, the Sobel Y kernel causes the gradient on the top side of the
inspected object to appear as a thin horizontal line of light pixels, and the
bottom gradient to appear as a line of dark pixels. The pixels surrounding the
two gradients were converted to medium gray.