Apply guided filter for edge-preserving smoothing, dehazing and so on.

The filter accepts the following options:

radius

Set the box radius in pixels. Allowed range is 1 to 20. Default is 3.

eps

Set regularization parameter (with square). Allowed range is 0 to 1. Default is 0.01.

mode

Set filter mode. Can be basic or fast. Default is basic.

sub

Set subsampling ratio for fast mode. Range is 2 to 64. Default is 4. No subsampling occurs in basic mode.

guidance

Set guidance mode. Can be off or on. Default is off. If off, single input is required. If on, two inputs of the same resolution and pixel format are required. The second input serves as the guidance.

planes

Set planes to filter. Default is first only.