Resampler< Interpolator, Transform > Class Template Reference

Public Member Functions

• Resampler (const Interpolator &interp, const Transform &T)
• void resample (const MArray< float, 2 > &In, MArray< float, 2 > &Out)

  resample both axes. the region of interest is given by the size of the Out array.
  

• void resample_wf (const MArray< float, 2 > &In, MArray< float, 2 > &Out, const float w1, const float w2, const float f1, const float f2)

  resample onto a grid of wavelength and f coordinates.
  

• void resample_xy (const MArray< float, 2 > &In, MArray< float, 2 > &Out, const float w1, const float w2, const float f1, const float f2)

  resample from wavelength and f space into pixel space.
  

• void resample_xy_xf (const MArray< float, 2 > &In, MArray< float, 2 > &Out, const float f1, const float f2)

  resample from CCD pixel x,y space to x,f space (rectify only the fiber coordinate).
  

• void resample_xf_xy (const MArray< float, 2 > &In, MArray< float, 2 > &Out, const float f1, const float f2)

  resample from x,f space to x,y space.
  

Protected Attributes

• const Interpolator & interp_
• const Transform & transform_

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Detailed Description

template<typename Interpolator, typename Transform>
class Resampler< Interpolator, Transform >

Generic 2D image resampler class. An image is resampled from one sample grid to another using interpolation to obtain the values on the new coordinate grid. Flux is conserved by evaluating the Jacobian at each new grid point.

It is assumed that the new pixels are of the same order or smaller than the original pixels, i.e. we are essentially interpolating, not rebinning onto larger pixels.

The template parameters are the interpolator kernel to use while resampling and the transform from one coordinate system to the new one. Both forward and backward transforms are possible.

Apart from resampling the whole image, there are the possibilities of resampling only one of the coordinates.

We assume that the relevant coordinate pairs are x,y (CCD pixel coordinates) and w,f (wavelength and f-coordinate; The f-co0rdinate is constant along fibers).

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Constructor & Destructor Documentation

template<typename Interpolator, typename Transform>

Resampler< Interpolator, Transform >::Resampler	(	const Interpolator &	interp,
		const Transform &	T
	)			[inline]

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Member Function Documentation

template<typename Interpolator , typename Transform >

void Resampler< Interpolator, Transform >::resample	(	const MArray< float, 2 > &	In,
		MArray< float, 2 > &	Out
	)			[inline]

References a, Resampler< Interpolator, Transform >::interp_, and Resampler< Interpolator, Transform >::transform_.

Referenced by resample_bicubic(), resample_lanczos(), and resample_sinc().

template<typename Interpolator , typename Transform >

void Resampler< Interpolator, Transform >::resample_wf	(	const MArray< float, 2 > &	In,
		MArray< float, 2 > &	Out,
		const float	w1,
		const float	w2,
		const float	f1,
		const float	f2
	)			[inline]

References a, df, Resampler< Interpolator, Transform >::interp_, and Resampler< Interpolator, Transform >::transform_.

Referenced by distort_bicubic(), distort_lanczos(), distort_sinc(), Extractor::extract_core(), Extractor::extract_core_ac(), and Measure::rectify_to_wf().

template<typename Interpolator , typename Transform >

void Resampler< Interpolator, Transform >::resample_xy	(	const MArray< float, 2 > &	In,
		MArray< float, 2 > &	Out,
		const float	w1,
		const float	w2,
		const float	f1,
		const float	f2
	)			[inline]

References a, df, Resampler< Interpolator, Transform >::interp_, and Resampler< Interpolator, Transform >::transform_.

template<typename Interpolator , typename Transform >

void Resampler< Interpolator, Transform >::resample_xy_xf	(	const MArray< float, 2 > &	In,
		MArray< float, 2 > &	Out,
		const float	f1,
		const float	f2
	)			[inline]

References a, and df.

Referenced by distort_bicubic(), distort_lanczos(), distort_sinc(), Extractor::extract_core_x(), Extractor::extract_core_x_ac(), FiberModel::flat_from_data(), and Measure::rectify_to_xf().

template<typename Interpolator , typename Transform >

void Resampler< Interpolator, Transform >::resample_xf_xy	(	const MArray< float, 2 > &	In,
		MArray< float, 2 > &	Out,
		const float	f1,
		const float	f2
	)			[inline]

References a, and df.

Referenced by FiberModel::flat_from_data().

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Field Documentation

template<typename Interpolator, typename Transform>

const Interpolator& Resampler< Interpolator, Transform >::interp_ [protected]

Referenced by Resampler< Interpolator, Transform >::resample(), Resampler< Interpolator, Transform >::resample_wf(), and Resampler< Interpolator, Transform >::resample_xy().

template<typename Interpolator, typename Transform>

const Transform& Resampler< Interpolator, Transform >::transform_ [protected]

Referenced by Resampler< Interpolator, Transform >::resample(), Resampler< Interpolator, Transform >::resample_wf(), and Resampler< Interpolator, Transform >::resample_xy().