## net.aerith.misao.image Class PSFComparer

java.lang.Object
|
+--net.aerith.misao.image.PSFComparer


public class PSFComparer
extends java.lang.Object

The PSFComparer is a class to compare two point spread functions.

The method calculateProportionTo calculates the proportion k which minimizes the amount of square of residuals:

     \sigma_{x} { f(x,y) - k * p(x,y) } ^ 2

where f(x,y) means the specified PSF, and p(x,y) means the base PSF.

The k is calculated as:

          \sigma_{x} { f(x,y) * p(x,y) }
k = --------------------------------
\sigma_{x} p(x,y) ^ 2

in the least square method.

 Field Summary protected  PSF base_psf           The base PSF. protected  double essential_radius           The radius from the center not to reject. protected  double rejected_ratio           The ratio of pixels to be rejected to calculate the proportion. protected  java.util.Vector rejected_scopes           The list of sight scopes to be rejected.

 Constructor Summary PSFComparer(PSF base_psf)           Constructs a PSFComparer.

 Method Summary  void addRejectedSightScope(SightScope scope)           Adds a sight scope to reject pixels within.  double calculateProportionTo(PSF psf)           Calculates the proportion to the specified PSF from the base PSF.  void setEssentialRadius(double radius)           Sets the radius from the center not to reject.  void setRejectedRatio(double ratio)           Sets the ratio of pixels to be rejected to calculate the proportion.

 Methods inherited from class java.lang.Object , clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, toString, wait, wait, wait

 Field Detail

### base_psf

protected PSF base_psf
The base PSF.

### rejected_ratio

protected double rejected_ratio
The ratio of pixels to be rejected to calculate the proportion.

protected double essential_radius
The radius from the center not to reject. When negative, every pixel can be rejected.

### rejected_scopes

protected java.util.Vector rejected_scopes
The list of sight scopes to be rejected.
 Constructor Detail

### PSFComparer

public PSFComparer(PSF base_psf)
Constructs a PSFComparer.
Parameters:
base_psf - the base PSF.
 Method Detail

### setRejectedRatio

public void setRejectedRatio(double ratio)
Sets the ratio of pixels to be rejected to calculate the proportion.
Parameters:
ratio - the ratio of pixels to be rejected to calculate the proportion.

public void setEssentialRadius(double radius)
Sets the radius from the center not to reject. When negative, every pixel can be rejected.
Parameters:
radius - the radius from the center not to reject.

public void addRejectedSightScope(SightScope scope)
Adds a sight scope to reject pixels within. Note that the sight scope must be expressed as 0 degree is in the direction of x axis, 90 degree is in the direction of y axis.
Parameters:
scope - a sight scope to reject pixels within.

### calculateProportionTo

public double calculateProportionTo(PSF psf)
Calculates the proportion to the specified PSF from the base PSF.
Parameters:
psf - the PSF.
Returns:
the proportion to the specified PSF from the base PSF.