Rockwell Automation 5370-CVIM2 Module User Manual
Page 306
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Chapter 7
Inspection Tools
7–68
X Edge, Y Edge Kernels
The
X Edge
and
Y Edge
kernels perform directional spatial filtering
functions that sharpen gradients lying along the Y–axis of the image (
X
Edge
) or the X–axis (
Y Edge
). (Note that the effect is similar to that of the
Sobel kernels, except that the
X Edge
’s 5x5 kernel produces a wider
gradient than the
Sobel X
’s 3x3 kernel.) The kernels for these two functions
use the same coefficient values, but these values are arrayed differently in
each kernel.
X Edge Kernel –– The coefficients in the
X Edge
kernel are arrayed in a 5x5
matrix, as follows:
1
1
1
2
2
4
0
–1
–1
–2
–1
0
–2
0
–4
1
2
–1
0
–2
1
1
0
–1
–1
Figure 7.57 illustrates the effect of the
X Edge
kernel on a dark object on a
light background.
Figure 7.57 Example: Effect of X Edge Kernel on Inspected Object
Image tool
Inspected
object