HighPassKernel Task

This task returns a high pass kernel of a specified size for use with convolution filtering. ENVI’s high pass kernel consists of a high central value, surrounded by negative weights. The default kernel size is 3x3.

Example

; Start the application

e = ENVI()

; Get the task from the catalog of ENVITasks

Task = ENVITask('HighPassKernel')

; Define outputs

Task.KERNEL_SIZE = [3,5]

; Run the task

Task.Execute

; Print the resulting 3x5 kernel

print, Task.OUTPUT_KERNEL

IDL prints:

-1.00000     -1.00000     -1.00000

-1.00000     -1.00000     -1.00000

-1.00000      14.0000     -1.00000

  -1.00000     -1.00000     -1.00000

  -1.00000     -1.00000     -1.00000

Syntax

Result = ENVITask('LowPassKernel')

Input parameters (Set, Get): KERNEL_SIZE

Output parameters (Get only): OUTPUT_KERNEL

Parameters marked as "Set" are those that you can set to specific values. You can also retrieve their current values any time. Parameters marked as "Get" are those whose values you can retrieve but not set.