Isis::TaylorCameraDistortionMap Class Reference
[Spice, Instruments, and Cameras]

Distort/undistort focal plane coordinates. More...

#include <TaylorCameraDistortionMap.h>

Public Member Functions
	TaylorCameraDistortionMap (Camera *parent, double zDirection=1.0)
	Taylor series camera distortion map constructor.
void	SetDistortion (const int naifIkCode)
	Load distortion coefficients.
	~TaylorCameraDistortionMap ()
	Destructor.
bool	SetFocalPlane (const double dx, const double dy)
	Compute undistorted focal plane x/y.
bool	SetUndistortedFocalPlane (const double ux, const double uy)
	Compute distorted focal plane x/y.
double	FocalPlaneX () const
	Return distorted focal plane x.
double	FocalPlaneY () const
	Return distorted focal plane y.
double	UndistortedFocalPlaneX () const
	Return undistorted focal plane x.
double	UndistortedFocalPlaneY () const
	Return undistorted focal plane y.
double	UndistortedFocalPlaneZ () const
	Return undistorted focal plane z.
Protected Member Functions
void	DistortionFunction (double ux, double uy, double dx, double dy)
	Compute distorted focal plane dx,dy given an undistorted focal plane ux,uy.
void	DistortionFunctionJacobian (double x, double y, double Jxx, double Jxy, double Jyx, double Jyy)
	Jacobian of the distortion function.
Protected Attributes
std::vector< double >	p_odtx
	distortion x coefficients
std::vector< double >	p_odty
	distortion y coefficients
Camera *	p_camera
double	p_focalPlaneX
double	p_focalPlaneY
double	p_undistortedFocalPlaneX
double	p_undistortedFocalPlaneY
double	p_zDirection
std::vector< double >	p_odk

Detailed Description

Distort/undistort focal plane coordinates.

Creates a map for adding/removing optical distortions from the focal plane of a camera. This class describes a non-radial distortion map. The distortion map is a third-order Taylor series expansion of a generic function.

See also:: MdisCamera; CameraDistortionMap

Author:: ????-??-?? Kris Becker

Constructor & Destructor Documentation

Isis::TaylorCameraDistortionMap::TaylorCameraDistortionMap	(	Camera *	parent,
		double	zDirection = `1.0`
	)

Taylor series camera distortion map constructor.

Create a geometric distortion model which is approximated by a third-order Taylor series expansion. This class maps between distorted and undistorted focal plane x/y's. The default mapping is the identity, that is, the focal plane x/y and undistorted focal plane x/y will be identical.

Parameters:

	parent	the parent camera that will use this distortion map
	zDirection	the direction of the focal plane Z-axis (either 1 or -1)

Isis::TaylorCameraDistortionMap::~TaylorCameraDistortionMap ( ) [inline]

Destructor.

Member Function Documentation

void Isis::TaylorCameraDistortionMap::DistortionFunction	(	double	ux,
		double	uy,
		double *	dx,
		double *	dy
	)			`[protected]`

Compute distorted focal plane dx,dy given an undistorted focal plane ux,uy.

This describes the third order Taylor approximation to the distortion model.

Parameters:

	ux	Undistored x
	uy	Undistored y
	dx	Result distorted x
	dy	Result distorted y

References p_odtx, and p_odty.

Referenced by SetFocalPlane(), and SetUndistortedFocalPlane().

void Isis::TaylorCameraDistortionMap::DistortionFunctionJacobian	(	double	x,
		double	y,
		double *	Jxx,
		double *	Jxy,
		double *	Jyx,
		double *	Jyy
	)			`[protected]`

Jacobian of the distortion function.

The Jacobian was computed algebraically from the function described in the DistortionFunction method.

Parameters:

	x
	y
	Jxx
	Jxy
	Jyx
	Jyy

References p_odtx, and p_odty.

Referenced by SetFocalPlane().

double Isis::CameraDistortionMap::FocalPlaneX ( ) const [inline, inherited]

Return distorted focal plane x.

References Isis::CameraDistortionMap::p_focalPlaneX.

Referenced by Isis::LineScanCameraGroundMap::FindFocalPlane(), and Isis::Camera::SetRightAscensionDeclination().

double Isis::CameraDistortionMap::FocalPlaneY ( ) const [inline, inherited]

Return distorted focal plane y.

References Isis::CameraDistortionMap::p_focalPlaneY.

Referenced by Isis::LineScanCameraGroundMap::FindFocalPlane(), and Isis::Camera::SetRightAscensionDeclination().

void Isis::TaylorCameraDistortionMap::SetDistortion ( const int naifIkCode )

Load distortion coefficients.

This method loads the distortion coefficients from the instrument kernel. The coefficients in the NAIF instrument kernel are expected to be in the form of:

 INSxxxxx_OD_T_X = ( xa, xb, xc, xd, xe, xf, xg, xh, xi, xj )
 INSxxxxx_OD_T_Y = ( ya, yb, yc, yd, ye, yf, yg, yh, yi, yj )

 where xxxxx is the instrument code (always a negative number)

These coefficient will be used to convert between focal plane xp,yp to undistorted x,y as follows

[ xp ] = [ xa xb xc xd xe xf xg xh xi xj ] * [ 1 ] [ yp ] [ ya yb yc yd ye yf yg yh yi yj ] [ x ] [ y ] [ x*x ] [ x*y ] [ y*y ] [ x*x*x ] [ x*x*y ] [ x*y*y ] [ y*y*y ]

Parameters:

naifIkCode

Code to search for in instrument kernel

Reimplemented from Isis::CameraDistortionMap.

References Isis::Spice::GetDouble(), Isis::CameraDistortionMap::p_camera, p_odtx, and p_odty.

Referenced by Isis::MdisCamera::MdisCamera().

bool Isis::TaylorCameraDistortionMap::SetFocalPlane	(	const double	dx,
		const double	dy
	)			`[virtual]`

Compute undistorted focal plane x/y.

Compute undistorted focal plane x/y given a distorted focal plane x/y. The undistorted coordinates are solved for using the Newton-Raphson method for root-finding if the SetDistortion method is invoked. After calling this method, you can obtain the undistorted x/y via the UndistortedFocalPlaneX and UndistortedFocalPlaneY methods.

Parameters:

	dx	distorted focal plane x in millimeters
	dy	distorted focal plane y in millimeters

Returns:: if the conversion was successful

See also:: SetDistortion

Reimplemented from Isis::CameraDistortionMap.

References DistortionFunction(), DistortionFunctionJacobian(), Isis::E(), Isis::CameraDistortionMap::p_focalPlaneX, Isis::CameraDistortionMap::p_focalPlaneY, p_odtx, p_odty, Isis::CameraDistortionMap::p_undistortedFocalPlaneX, Isis::CameraDistortionMap::p_undistortedFocalPlaneY, x, and y.

bool Isis::TaylorCameraDistortionMap::SetUndistortedFocalPlane	(	const double	ux,
		const double	uy
	)			`[virtual]`

Compute distorted focal plane x/y.

Compute distorted focal plane x/y given an undistorted focal plane x/y. The distortion model is approximated by a third order Taylor series expansion of a generic function if the SetDistortion method was invoked. After calling this method, you can obtain the distorted x/y via the FocalPlaneX and FocalPlaneY methods

Parameters: