components.interp.filtergenerator
- class FilterGenerator(config={}, **kwds)[source]
Bases:
Component
Classic filter generator component.
Create a filter from a Hamming windowed sinc function. The cut frequency is set to the “Nyquist limit” (half the sampling frequency) of the input or output sampling frequency, whichever is the lower. This cut frequency can be adjusted with the
xcut
andycut
configuration.Connecting a
FilterGenerator
component’soutput
to aResize
component’sfilter
input allows the filter to be updated (while the components are running) by changing theFilterGenerator
config:filgen = FilterGenerator(xup=2, xaperture=16) resize = Resize(xup=2) filgen.connect('output', resize.filter) ... start(..., filgen, resize, ...) ... filgen.set_config({'xaperture': 8}) ...
If you don’t need to change the configuration after creating the
Resize
component then it’s simpler to use aFilterGeneratorCore
to create a fixed filter.2-dimensional filters can be produced by setting both
xaperture
andyaperture
, but it is usually more efficient to use twoResize
components to process the two dimensions independently.Config:
xup
int
Horizontal up-conversion factor.
xdown
int
Horizontal down-conversion factor.
xaperture
int
Horizontal filter aperture.
xcut
int
Adjust horizontal cut frequency. Default is 100%.
yup
int
Vertical up-conversion factor.
ydown
int
Vertical down-conversion factor.
yaperture
int
Vertical filter aperture.
ycut
int
Adjust vertical cut frequency. Default is 100%.
- classmethod core(x_up=1, x_down=1, x_ap=1, x_cut=100, y_up=1, y_down=1, y_ap=1, y_cut=100)[source]
Classic filter generator core.
Alternative to the
FilterGenerator
component that can be used to make a non-reconfigurable resizer:resize = Resize(xup=2) resize.filter(FilterGenerator.core(xup=2, xaperture=16)) ... start(..., resize, ...) ...
- Parameters:
x_up (int) – Horizontal up-conversion factor.
x_down (int) – Horizontal down-conversion factor.
x_ap (int) – Horizontal filter aperture.
x_cut (int) – Horizontal cut frequency adjustment.
y_up (int) – Vertical up-conversion factor.
y_down (int) – Vertical down-conversion factor.
y_ap (int) – Vertical filter aperture.
y_cut (int) – Vertical cut frequency adjustment.
- Returns:
A
Frame
object containing the filter.
Comments or questions? Please email jim@jim-easterbrook.me.uk.