# Distort options page 1

 Affine Distort the image linearly by moving a list of at least 3 or more sets of control points Row title = affine.png ``` ``` Affine projection Linearly distort an image using the given Affine Matrix of 6 pre-calculated coefficients Row title = No image availableMore information to follow. ``` ``` Arc Arc the image (variation of polar mapping) over the angle given around a circle. Row title = arc.png ``` ``` Barrel Given the four coefficients (A,B,C,D) as defined by Helmut Dersch, perform a barrel or pin-cushion distortion appropriate to correct radial lens distortions. Row title = barrel.png ``` ``` Barrel Inverse This is very similar to 'Barrel' with the same set of arguments, and argument handling. However it uses the inverse of the radial polynomial. Row title = No image availableMore information to follow. ``` ``` Bilinear forward Bilinear Distortion, given a minimum of 4 sets of coordinate pairs, or 16 values. Row title = bilinearforward.png ``` ``` Bilinear reverse Bilinear Distortion, given a minimum of 4 sets of coordinate pairs, or 16 values. Row title = bilinearreverse.png ``` ```( Reversing the Bilinear forward effect. ) DePolar Uses the same arguments and meanings as a 'Polar' distortion but generates the reverse Polar to Cartesian distortion. Row title = depolar.png ``` ```( Opposite effect to polar. ) Perspective Perspective distort the images, using a list of 4 or more sets of control points. Row title = perspective.png ``` ```( The later control points are in a different order to the earlier versions. ) PerspectiveProjection Do a 'Perspective' distortion biased on a set of 8 pre-calculated coefficients. Row title = No image availableMore information to follow. ``` ``` Polar Like 'Arc' but do a complete Cartesian to Polar mapping of the image. Row title = polar.png ``` ``` Scale rotate translate Distort image by first scaling and rotating about a given 'center', before translating that 'center' to the new location, in that order. Row title = srt.png ``` ```( Also known as SRT ) Shepards Distort the given list control points (any number) using an Inverse Squared Distance Interpolation Method. Row title = shepards.png ``` ```