LowPassKernel Task
This task returns a low pass kernel of a specified size, for use with convolution filtering. ENVI’s low pass filter contains the same weights in each kernel element. The default kernel size is 3x3.
Example
; Start the application
e = ENVI(/HEADLESS)
; Get the task from the catalog of ENVITasks
Task = ENVITask('LowPassKernel')
; Define outputs
Task.KERNEL_SIZE = [3,5]
; Run the task
Task.Execute
; Print the resulting 3x5 kernel
print, Task.OUTPUT_KERNEL
IDL prints:
0.0666667 0.0666667 0.0666667
0.0666667 0.0666667 0.0666667
0.0666667 0.0666667 0.0666667
0.0666667 0.0666667 0.0666667
0.0666667 0.0666667 0.0666667
Syntax
Result = ENVITask('LowPassKernel')
Input properties (Set, Get): 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:
This task also contains the following properties:
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 kernel size is [3,3].
OUTPUT_KERNEL
This is the low pass kernel output.
Version History
|
ENVI 5.3 |
Introduced |
API Version
4.2
See Also
ENVITask, DirectionalFilter Task, DirectionalKernel Task, GaussianHighPassKernel Task, GaussianHighPassFilter Task, GaussianLowPassKernel Task, GaussianLowPassFilter Task, HighPassFilter Task, HighPassKernel Task, LaplacianFilter Task, LaplacianKernel Task, LowPassFilter Task, MedianFilter Task, RasterConvolution Task, SobelFilter Task, RobertsFilter Task