Spectral convolution Box filter
1D Box filter. The Box filter or running mean is a smoothing filter. It is not isotropic and can produce artifacts, when applied repeatedly to the same data.
The Spectral convolution Box filter is used to reduce noise by averaging reflectance values within a defined neighborhood, defined by a kernel with equal weights. The size of the kernel determines the extent of the averaging effect. The filter is not isotropic and can produce artifact, when applied repeatedly to the same data.
Usage:
Start the algorithm from the Processing Toolbox panel.
Select the raster to process and modify the parameterization if necessary, then click run.
Processed image in comparison to the original.
Parameters
- Raster layer [raster]
Raster layer to be filtered.
- Kernel [string]
Python code. See Box1DKernel for information on different parameters. Default:
from astropy.convolution import Box1DKernel kernel = Box1DKernel\(width=5\)
- Normalize kernel [boolean]
Whether to normalize the kernel to have a sum of one. Default: False
- Interpolate no data pixel [boolean]
Whether to interpolate no data pixel. Will result in renormalization of the kernel at each position ignoring pixels with no data values. Default: True
Outputs
- Output raster layer [rasterDestination]
Raster file destination.
Command-line usage
>qgis_process help enmapbox:SpectralConvolutionBoxFilter
:
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Arguments
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raster: Raster layer
Argument type: raster
Acceptable values:
- Path to a raster layer
kernel: Kernel
Default value: from astropy.convolution import Box1DKernel
kernel = Box1DKernel(width=5)
Argument type: string
Acceptable values:
- String value
- field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
- expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
normalize: Normalize kernel
Default value: false
Argument type: boolean
Acceptable values:
- 1 for true/yes
- 0 for false/no
- field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
- expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
interpolate: Interpolate no data pixel
Default value: true
Argument type: boolean
Acceptable values:
- 1 for true/yes
- 0 for false/no
- field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field
- expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression
outputRaster: Output raster layer
Argument type: rasterDestination
Acceptable values:
- Path for new raster layer
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Outputs
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outputRaster: <outputRaster>
Output raster layer