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
-1.32893 -0.422618 0.483689
-0.906308 0.000000 0.906308
-0.483689 0.422618 1.32893
-0.483689 0.422618 1.32893
Syntax
Result = ENVITask('DirectionalKernel')
Input parameters (Set, Get): ANGLE, 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.
Input Parameters
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 Parameters
OUTPUT_KERNEL
This is the directional kernel output.
Methods
Properties
Version History
|
ENVI 5.3 |
Introduced |
See Also
ENVITask, DirectionalFilter Task, GaussianHighPassFilter Task, GaussianHighPassKernel Task, GaussianLowPassKernel Task, GaussianLowPassFilter Task, HighPassFilter Task, HighPassKernel Task, LaplacianFilter Task, LaplacianKernel Task, LowPassFilter Task, LowPassKernel Task, MedianFilter Task, RasterConvolution Task, SobelFilter Task, RobertsFilter Task