Tool Name	Laplacian Filter
Tool ID	2
Library ID	grid_filter
Version	1.0
Author(s)	A.Ringeler (c) 2003, O.Conrad (c) 2008

Description

The Laplacian filter is a high-pass filter operator that is commonly used for edge detection. Also referred to as Laplacian of Gaussian (LoG) or Marr-Hildreth-Operator.
The kernel can be defined by search radius and weighting function adjustment or be chosen from predefined standards.

Standard kernel 1 (3x3):

0	-1	0
-1	4	-1
0	-1	0

Standard kernel 2 (3x3):

-1	-1	-1
-1	8	-1
-1	-1	-1

Standard kernel 3 (3x3):

-1	-2	-1
-2	12	-2
-1	-2	-1

Parameters

Name	Type	Identifier	Description	Constraints
Input
Grid	grid, input	INPUT
Output
Filtered Grid	grid, output, optional	RESULT
Options
Method	choice	METHOD		Available Choices: [0] standard kernel 1 [1] standard kernel 2 [2] Standard kernel 3 [3] user defined kernel Default: 3
Kernel Radius	integer number	KERNEL_RADIUS		Minimum: 1 Default: 2
Standard Deviation	floating point number	SIGMA	The standard deviation as percentage of the kernel radius.	Minimum: 1.000000 Default: 30.000000