Package skyview.geometry.distorter
Class SIP
- java.lang.Object
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- skyview.geometry.Transformer
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- skyview.geometry.Distorter
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- skyview.geometry.distorter.SIP
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- All Implemented Interfaces:
java.io.Serializable
,Component
public class SIP extends Distorter
Implement the SIP convention for distorting a standard projection. The SIP distortion as defined in the FITS headers takes place after the CD matrix has been applied to the data which makes it happen later than the other distorters. The applyBeforeScaling method is defined to return false for this scaler. Note that although the CD matrix is applied, the CRPIX offset is not. In principle it would be possible to adjust the coefficients so that the distortion took place before the scaling but we have chosen to mimic the approach used in the SIP definition.- See Also:
- Serialized Form
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Nested Class Summary
Nested Classes Modifier and Type Class Description class
SIP.SIPinverse
Create the inverse distorter for the main class here.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
applyBeforeScaling()
java.lang.String
getDescription()
What does this object do?java.lang.String
getName()
A name for this objectDistorter
inverse()
Get the inverse of the transformation.boolean
isInverse(Transformer trans)
Is another transformer the inverse of this one? True only if it was created as the inverse of this transformation.static void
main(java.lang.String[] args)
void
transform(double[] in, double[] out)
Calculate the distorted (actual pixel) coordinates given the standard coordinates.-
Methods inherited from class skyview.geometry.Distorter
getInputDimension, getOutputDimension, jacobian
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Methods inherited from class skyview.geometry.Transformer
transform, transform
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Constructor Detail
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SIP
public SIP(nom.tam.fits.Header h)
Create a distorter from a FITS header. We will look for A_ORDER, B_ORDER, A_n_m and B_n_m keywords. If AP_ORDER and BP_ORDER are found and the SIPNumericInversion setting is not found, then we will also look for AP_n_m and BP_n_m for the inverse distortion.
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SIP
public SIP(double[][] distortx, double[][] distorty, double[][] undistortx, double[][] undistorty)
Explicitly set the coefficients for the distorter. We infer the order from the input arrays. If the undistort's arguments are given we assume that the user wishes to use the inverse distortion. If null then we use numerical inversion of the distortion.
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Method Detail
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getName
public java.lang.String getName()
Description copied from class:Distorter
A name for this object
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getDescription
public java.lang.String getDescription()
Description copied from class:Distorter
What does this object do?- Specified by:
getDescription
in interfaceComponent
- Specified by:
getDescription
in classDistorter
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inverse
public Distorter inverse()
Description copied from class:Transformer
Get the inverse of the transformation. If the order matters, then the inverse is to be applied after the original transformation. This is primarily an issue with Converters.
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applyBeforeScaling
public boolean applyBeforeScaling()
- Overrides:
applyBeforeScaling
in classDistorter
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transform
public void transform(double[] in, double[] out)
Calculate the distorted (actual pixel) coordinates given the standard coordinates. Note that the coefficients only give the distortion, so we need to add in the inputs. Note that primary transformations defined in SIP go the other way. Given an actual pixel location, they give the a sky position in the undistorted plane.- Specified by:
transform
in classTransformer
- Parameters:
in
- The input vector.out
- The output vector, it may be the same as the input vector if the dimensionalities are the same. All transformers are expected to work with aliased inputs and output.
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isInverse
public boolean isInverse(Transformer trans)
Is another transformer the inverse of this one? True only if it was created as the inverse of this transformation.- Specified by:
isInverse
in classTransformer
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main
public static void main(java.lang.String[] args)
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