Rockwell Automation 5370-CVIM2 Module - Manual (Page 304)

Chapter 7
Inspection Tools
7–66
Laplace Kernel
The Laplace kernel performs nondirectional spatial filtering functions that
sharpen gradients lying along both the X–axis and the Y–axis of the image.
The coefficients in the Laplace kernel are arrayed in a 3x3 matrix, as
follows:
–1 0
–1
0
4
–1
0
–1
0
Figure 7.55 illustrates the effect of the Laplace kernel on a dark inspected
object on a light background.
Figure 7.55 Example: Effect of Laplace Kernel on Object in Image
Image tool
Inspected
object
In Figure 7.55, the Laplace kernel causes the gradients on the all sides of the
inspected object to appear as a very thin line of light pixels, while the pixels
surrounding the gradients were converted to medium gray.