Defish

“Defish” - barrel and pincushion distortion correction filter
defish (v1.1) MT for Avisynth 2.5
(c) David Horman, 2010
Multithreaded version (c) 2011 Andrey “Efenstor” Pivovarov

This filter can be used to correct (or induce) barrel and pincushion
distortion.

USAGE

The filter takes the following parameters (in addition to the input clip):

[unnamed]
Input clip. Must be RGB32 and have even width/height.
fov
useful range: -180.0 - 180.0
default: 0
The horizontal field of view, in degrees. Positive values will
correct barrel distortion (induce pincushioning). Negative values
should correct pincushion distortion (induce barreling), but note
that this may currently be implemented incorrectly.
scale
```
  range: 0.0 - infinity
```
default: 1.0
An adjustment parameter which scales the image after correction.
aspect
range: 0.0 - infinity
default: 1.0
The pixel aspect ratio of the input clip.
direction
values: “x”, “y”
This parameter restricts the correction to either horizontal or
vertical only.
scaling
values: “fitx”, “fity”, “fitxy”
This parameter automatically scales the image to fill the image
horizontally, vertically, or both. The “scale” parameter above is
still effective.

The default behaviour when using fov is to scale the image such
that the central area stays at the original scale.

This parameter is not effective when using the polynomial values
below.

a,b,c

  sensible range: 0.0 - 1.0
  Parameters for correcting distortion polynomially. These are only
  effective when fov=0 (which is the default value).
  a+b+c must be less than or equal to 1.0 when pin=true.

pin
boolean
Set this to true to correct pincushion distortion, and false to
correct barrel distortion - this may seem the wrong way around but
it was chosen to match the behaviour of the similar parameter of
V.C. Mohan’s DeBarrel filter.

threads

  range: 0 - infinity
  0 (default) sets the number of processing threads to the number of
  autodetected CPU's/cores.

Defish

Links

USAGE