RNiftyReg: buildAffine – R documentation

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buildAffine

Build an affine matrix up from its constituent transformations

Description

This function does the opposite to decomposeAffine, building up an affine matrix from its components. It can be useful for testing, or for rescaling images.

Usage

buildAffine(translation = c(0, 0, 0), scales = c(1, 1, 1), skews = c(0,
  0, 0), angles = c(0, 0, 0), source = NULL, target = NULL,
  anchor = c("none", "origin", "centre", "center"))

Arguments

`translation`	Translations along each axis, in `pixunits` units. May also be a list, such as that produced by `decomposeAffine`, with elements for translation, scales, skews and angles.
`scales`	Scale factors along each axis.
`skews`	Skews in the XY, XZ and YZ planes.
`angles`	Roll, pitch and yaw rotation angles, in radians. If `source` is two-dimensional, a single angle will be interpreted as being in the plane as expected.
`source`	The source image for the transformation (required).
`target`	The target image for the transformation. If `NULL` (the default), it will be equal to `source`, or a rescaled version of it if any of the `scales` are not 1. In the latter case the scales will be reset back to 1 to produce the right effect.
`anchor`	The fixed point for the transformation. Setting this parameter to a value other than `"none"` will override the `translation` parameter, with the final translation set to ensure that the requested point remains in the same place after transformation.

Value

A 4x4 affine matrix representing the composite transformation. Note that NiftyReg affines logically transform backwards, from target to source space, so the matrix may be the inverse of what is expected.

Author(s)

Jon Clayden <code@clayden.org>

buildAffine

Description

Usage

Arguments

Value

Author(s)

See Also

RNiftyReg

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