DirectionalKernel Task

This task returns a directional kernel for use with convolution filtering.

Example

; Start the application

e = ENVI(/HEADLESS)

; Get the task from the catalog of ENVITasks

Task = ENVITask('DirectionalKernel')

; Define kernel size

Task.KERNEL_SIZE = [3,5]

; Define the angle in degrees

Task.ANGLE = 25.0

; Run the task

Task.Execute

; Print the resulting kernel

print, Task.OUTPUT_KERNEL

IDL prints:

-1.32893 -0.422618 0.483689

-0.906308 0.000000 0.906308

-0.483689 0.422618 1.32893

Syntax

Result = ENVITask('DirectionalKernel')

Input properties (Set, Get): ANGLE, KERNEL_SIZE

Output properties (Get only): OUTPUT_KERNEL

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

Methods

This task inherits the following methods from ENVITask:

Properties

This task inherits the following properties from ENVITask:

COMMUTE_ON_DOWNSAMPLE

ANGLE (required)

Specify the angle in degrees. The default value is 0.

KERNEL_SIZE (optional)

Specify a two-element array [n,m] as the kernel size, where n is the number of columns and m is the number of rows. The default value is [3,3].

OUTPUT_KERNEL

This is the directional kernel output.

Version History

ENVI 5.3

Introduced

API Version

4.2