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19th February 2010, 23:40 | #1 | Link |
Formerly davidh*****
Join Date: Jan 2004
Posts: 2,496
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"Defish", barrel and pincushion distortion correction filter
Updated 2010/02/21 - version 1.1
Download: defish It's taken me several years since my first post on this subject, but I've finally written a usable fisheye distortion correction plugin: It uses spline16 interpolation. Code:
defish (v1.1) for Avisynth 2.5 (c) David Horman, 2010 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. Last edited by wonkey_monkey; 16th March 2015 at 22:55. |
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