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| -rw-r--r-- | docs/filters.rst | 20 |
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diff --git a/docs/filters.rst b/docs/filters.rst index 96a40ea..d962b31 100644 --- a/docs/filters.rst +++ b/docs/filters.rst @@ -801,6 +801,26 @@ Frequency filtering Theta parameter of Faris-Byer filter. +Stripe filtering +---------------- + +.. gobj:class:: filter-stripes + + Filter vertical stripes. The input and output are in 2D frequency domain. + The filter multiplies horizontal frequencies (for frequency ky=0) with a + Gaussian profile centered at 0 frequency. + + Example usage:: + + $ ufo-launch read path=sino.tif ! fft dimensions=2 ! filter-stripes sigma=1 ! ifft dimensions=2 ! write filename=sino-filtered.tif + + .. gobj:prop:: sigma:float + + Filter strength, which is the sigma of the gaussian. Small values, e.g. + 1e-7 cause only the zero frequency to remain in the signal, i.e. + stronger filtering. + + 1D stripe filtering ------------------- |