#include <itkLevenbergMarquardtOptimizer.h>
Inheritance diagram for itk::LevenbergMarquardtOptimizer:
Definition at line 31 of file itkLevenbergMarquardtOptimizer.h.
typedef ReceptorMemberCommand< Self > itk::MultipleValuedNonLinearVnlOptimizer::CommandType [protected, inherited] |
Command observer that will interact with the ITK-VNL cost-function adaptor in order to generate iteration events. This will allow to overcome the limitation of VNL optimizers not offering callbacks for every iteration
Definition at line 109 of file itkMultipleValuedNonLinearVnlOptimizer.h.
| typedef SmartPointer<const Self> itk::LevenbergMarquardtOptimizer::ConstPointer |
Reimplemented from itk::MultipleValuedNonLinearVnlOptimizer.
Definition at line 39 of file itkLevenbergMarquardtOptimizer.h.
typedef Superclass::CostFunctionAdaptorType itk::LevenbergMarquardtOptimizer::CostFunctionAdaptorType [protected] |
Reimplemented from itk::MultipleValuedNonLinearVnlOptimizer.
Definition at line 74 of file itkLevenbergMarquardtOptimizer.h.
typedef CostFunctionType::Pointer itk::MultipleValuedNonLinearOptimizer::CostFunctionPointer [inherited] |
Definition at line 45 of file itkMultipleValuedNonLinearOptimizer.h.
typedef MultipleValuedCostFunction itk::MultipleValuedNonLinearOptimizer::CostFunctionType [inherited] |
Type of the Cost Function
Reimplemented in itk::CumulativeGaussianOptimizer.
Definition at line 44 of file itkMultipleValuedNonLinearOptimizer.h.
typedef Array2D<double> itk::MultipleValuedNonLinearOptimizer::DerivativeType [inherited] |
Derivative type. It defines a type used to return the cost function derivative. Here a bidimensional Array is used for Multivalued functions
Definition at line 66 of file itkMultipleValuedNonLinearOptimizer.h.
| typedef vnl_levenberg_marquardt itk::LevenbergMarquardtOptimizer::InternalOptimizerType |
Internal optimizer type.
Definition at line 51 of file itkLevenbergMarquardtOptimizer.h.
| typedef vnl_vector<double> itk::LevenbergMarquardtOptimizer::InternalParametersType |
InternalParameters typedef.
Definition at line 45 of file itkLevenbergMarquardtOptimizer.h.
typedef Array<double> itk::MultipleValuedNonLinearOptimizer::MeasureType [inherited] |
Measure type. It defines a type used to return the cost function value. Here an Array is used for Multivalued functions
Reimplemented in itk::CumulativeGaussianOptimizer.
Definition at line 61 of file itkMultipleValuedNonLinearOptimizer.h.
typedef Superclass::ParametersType itk::MultipleValuedNonLinearVnlOptimizer::ParametersType [inherited] |
ParametersType typedef. It defines a position in the optimization search space.
Reimplemented from itk::MultipleValuedNonLinearOptimizer.
Definition at line 48 of file itkMultipleValuedNonLinearVnlOptimizer.h.
Reimplemented from itk::MultipleValuedNonLinearVnlOptimizer.
Definition at line 38 of file itkLevenbergMarquardtOptimizer.h.
typedef Superclass::ScalesType itk::NonLinearOptimizer::ScalesType [inherited] |
Scale type. This array defines scale to be applied to parameters before being evaluated in the cost function. This allows to map to a more convenient space. In particular this is used to normalize parameter spaces in which some parameters have a different dynamic range.
Reimplemented from itk::Optimizer.
Definition at line 52 of file itkNonLinearOptimizer.h.
Standard "Self" typedef.
Reimplemented from itk::MultipleValuedNonLinearVnlOptimizer.
Definition at line 36 of file itkLevenbergMarquardtOptimizer.h.
Reimplemented from itk::MultipleValuedNonLinearVnlOptimizer.
Definition at line 37 of file itkLevenbergMarquardtOptimizer.h.
| itk::LevenbergMarquardtOptimizer::LevenbergMarquardtOptimizer | ( | ) | [protected] |
| virtual itk::LevenbergMarquardtOptimizer::~LevenbergMarquardtOptimizer | ( | ) | [protected, virtual] |
| unsigned long itk::Object::AddObserver | ( | const EventObject & | event, | |
| Command * | ||||
| ) | const [inherited] |
| unsigned long itk::Object::AddObserver | ( | const EventObject & | event, | |
| Command * | ||||
| ) | [inherited] |
Allow people to add/remove/invoke observers (callbacks) to any ITK object. This is an implementation of the subject/observer design pattern. An observer is added by specifying an event to respond to and an itk::Command to execute. It returns an unsigned long tag which can be used later to remove the event or retrieve the command. The memory for the Command becomes the responsibility of this object, so don't pass the same instance of a command to two different objects
| static void itk::LightObject::BreakOnError | ( | ) | [static, inherited] |
This method is called when itkExceptionMacro executes. It allows the debugger to break on error.
| virtual LightObject::Pointer itk::Object::CreateAnother | ( | ) | const [virtual, inherited] |
Create an object from an instance, potentially deferring to a factory. This method allows you to create an instance of an object that is exactly the same type as the referring object. This is useful in cases where an object has been cast back to a base class.
Reimplemented from itk::LightObject.
| virtual void itk::Object::DebugOff | ( | ) | const [virtual, inherited] |
Turn debugging output off.
| virtual void itk::Object::DebugOn | ( | ) | const [virtual, inherited] |
Turn debugging output on.
| virtual void itk::LightObject::Delete | ( | ) | [virtual, inherited] |
Delete an itk object. This method should always be used to delete an object when the new operator was used to create it. Using the C delete method will not work with reference counting.
| virtual const ParametersType& itk::MultipleValuedNonLinearVnlOptimizer::GetCachedCurrentPosition | ( | ) | [virtual, inherited] |
| virtual const DerivativeType& itk::MultipleValuedNonLinearVnlOptimizer::GetCachedDerivative | ( | ) | [virtual, inherited] |
| virtual const MeasureType& itk::MultipleValuedNonLinearVnlOptimizer::GetCachedValue | ( | ) | [virtual, inherited] |
Return Cached Values. These method have the advantage of not triggering a recomputation of the metric value, but it has the disadvantage of returning a value that may not be the one corresponding to the current parameters. For GUI update purposes, this method is a good option, for mathematical validation you should rather call GetValue().
| Command* itk::Object::GetCommand | ( | unsigned long | tag | ) | [inherited] |
Get the command associated with the given tag. NOTE: This returns a pointer to a Command, but it is safe to asign this to a Command::Pointer. Since Command inherits from LightObject, at this point in the code, only a pointer or a reference to the Command can be used.
| CostFunctionAdaptorType* itk::MultipleValuedNonLinearVnlOptimizer::GetCostFunctionAdaptor | ( | void | ) | [protected, inherited] |
| const CostFunctionAdaptorType* itk::MultipleValuedNonLinearVnlOptimizer::GetCostFunctionAdaptor | ( | void | ) | const [protected, inherited] |
| virtual const ParametersType& itk::Optimizer::GetCurrentPosition | ( | ) | [virtual, inherited] |
Get current position of the optimization.
| bool itk::Object::GetDebug | ( | ) | const [inherited] |
Get the value of the debug flag.
| static bool itk::Object::GetGlobalWarningDisplay | ( | ) | [static, inherited] |
| virtual const ParametersType& itk::Optimizer::GetInitialPosition | ( | ) | [virtual, inherited] |
Get the position to initialize the optimization.
| const MetaDataDictionary& itk::Object::GetMetaDataDictionary | ( | void | ) | const [inherited] |
| MetaDataDictionary& itk::Object::GetMetaDataDictionary | ( | void | ) | [inherited] |
| virtual unsigned long itk::Object::GetMTime | ( | ) | const [virtual, inherited] |
Return this objects modified time.
Reimplemented in itk::ImageRegistrationMethod< TFixedImage, TMovingImage >, itk::ImageToSpatialObjectRegistrationMethod< TFixedImage, TMovingSpatialObject >, itk::MultiResolutionImageRegistrationMethod< TFixedImage, TMovingImage >, itk::PointSetToImageRegistrationMethod< TFixedPointSet, TMovingImage >, itk::PointSetToPointSetRegistrationMethod< TFixedPointSet, TMovingPointSet >, itk::DeformationFieldSource< TOutputImage >, itk::InverseDeformationFieldImageFilter< TInputImage, TOutputImage >, itk::ResampleImageFilter< TInputImage, TOutputImage, TInterpolatorPrecisionType >, itk::VectorResampleImageFilter< TInputImage, TOutputImage, TInterpolatorPrecisionType >, itk::BoundingBox< TPointIdentifier, VPointDimension, TCoordRep, TPointsContainer >, itk::ImageAdaptor< TImage, TAccessor >, itk::ResampleImageFilter< TInputImage, TOutputImage, TInterpolatorPrecisionType >, itk::ImageSpatialObject< TDimension, TPixelType >, itk::MeshSpatialObject< TMesh >, itk::SceneSpatialObject< TSpaceDimension >, itk::SpatialObject< TDimension >, itk::ImageAdaptor< TImage, itk::Accessor::AsinPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::AbsPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::LogPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::ComplexToPhasePixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::Log10PixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::ExpPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::AddPixelAccessor< TImage::PixelType > >, itk::ImageAdaptor< itk::VectorImage< TPixelType, Dimension >, itk::Accessor::VectorImageToImagePixelAccessor< TPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::RGBToVectorPixelAccessor< TImage::PixelType::ComponentType > >, itk::ImageAdaptor< TImage, itk::PixelAccessor< TInternalType, TExternalType > >, itk::ImageAdaptor< TImage, itk::Accessor::SqrtPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::AcosPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::ComplexToModulusPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::ExpNegativePixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::VectorToRGBPixelAccessor< TImage::PixelType::ValueType > >, itk::ImageAdaptor< TImage, itk::Accessor::TanPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::ComplexToRealPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::RGBToLuminancePixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::AtanPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::SinPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::ComplexToImaginaryPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::CosPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageSpatialObject< TDimension, unsigned char >, itk::SpatialObject< 3 >, and itk::SpatialObject< ::itk::GetMeshDimension< TMesh >::PointDimension >.
Referenced by itk::SpatialObject< ::itk::GetMeshDimension< TMesh >::PointDimension >::GetObjectMTime().
| virtual const char* itk::LevenbergMarquardtOptimizer::GetNameOfClass | ( | ) | const [virtual] |
Run-time type information (and related methods).
Reimplemented from itk::MultipleValuedNonLinearVnlOptimizer.
| CostFunctionAdaptorType* itk::MultipleValuedNonLinearVnlOptimizer::GetNonConstCostFunctionAdaptor | ( | void | ) | const [protected, inherited] |
The purpose of this method is to get around the lack of const correctness in vnl cost_functions and optimizers
| vnl_levenberg_marquardt* itk::LevenbergMarquardtOptimizer::GetOptimizer | ( | void | ) |
Method for getting access to the internal optimizer.
| virtual int itk::LightObject::GetReferenceCount | ( | ) | const [inline, virtual, inherited] |
Gets the reference count on this object.
Definition at line 98 of file itkLightObject.h.
| virtual const ScalesType& itk::Optimizer::GetScales | ( | ) | [virtual, inherited] |
Get current parameters scaling.
| bool itk::MultipleValuedNonLinearVnlOptimizer::GetUseCostFunctionGradient | ( | ) | const [inherited] |
| MeasureType itk::LevenbergMarquardtOptimizer::GetValue | ( | ) | const |
Get the current value
| static void itk::Object::GlobalWarningDisplayOff | ( | ) | [inline, static, inherited] |
| static void itk::Object::GlobalWarningDisplayOn | ( | ) | [inline, static, inherited] |
| bool itk::Object::HasObserver | ( | const EventObject & | event | ) | const [inherited] |
Return true if an observer is registered for this event.
| void itk::Object::InvokeEvent | ( | const EventObject & | ) | const [inherited] |
Call Execute on all the Commands observing this event id. The actions triggered by this call doesn't modify this object.
| void itk::Object::InvokeEvent | ( | const EventObject & | ) | [inherited] |
Call Execute on all the Commands observing this event id.
| virtual void itk::Object::Modified | ( | ) | const [virtual, inherited] |
Update the modification time for this object. Many filters rely on the modification time to determine if they need to recompute their data.
Reimplemented in itk::NormalizeImageFilter< TInputImage, TOutputImage >, itk::ImageAdaptor< TImage, TAccessor >, itk::ImageAdaptor< TImage, itk::Accessor::AsinPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::AbsPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::LogPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::ComplexToPhasePixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::Log10PixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::ExpPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::AddPixelAccessor< TImage::PixelType > >, itk::ImageAdaptor< itk::VectorImage< TPixelType, Dimension >, itk::Accessor::VectorImageToImagePixelAccessor< TPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::RGBToVectorPixelAccessor< TImage::PixelType::ComponentType > >, itk::ImageAdaptor< TImage, itk::PixelAccessor< TInternalType, TExternalType > >, itk::ImageAdaptor< TImage, itk::Accessor::SqrtPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::AcosPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::ComplexToModulusPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::ExpNegativePixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::VectorToRGBPixelAccessor< TImage::PixelType::ValueType > >, itk::ImageAdaptor< TImage, itk::Accessor::TanPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::ComplexToRealPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::RGBToLuminancePixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::AtanPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::SinPixelAccessor< TImage::PixelType, TOutputPixelType > >, itk::ImageAdaptor< TImage, itk::Accessor::ComplexToImaginaryPixelAccessor< TImage::PixelType, TOutputPixelType > >, and itk::ImageAdaptor< TImage, itk::Accessor::CosPixelAccessor< TImage::PixelType, TOutputPixelType > >.
Referenced by itk::NarrowBandImageFilterBase< TInputImage, itk::Image< TOutputPixelType,::itk::GetImageDimension< TInputImage >::ImageDimension > >::InsertNarrowBandNode(), itk::MatrixOffsetTransformBase< TScalarType, 3, 3 >::SetCenter(), itk::HistogramAlgorithmBase< TInputHistogram >::SetInputHistogram(), itk::MatrixOffsetTransformBase< TScalarType, 3, 3 >::SetMatrix(), itk::NarrowBandImageFilterBase< TInputImage, itk::Image< TOutputPixelType,::itk::GetImageDimension< TInputImage >::ImageDimension > >::SetNarrowBand(), itk::NarrowBandImageFilterBase< TInputImage, itk::Image< TOutputPixelType,::itk::GetImageDimension< TInputImage >::ImageDimension > >::SetNarrowBandInnerRadius(), itk::NarrowBandImageFilterBase< TInputImage, itk::Image< TOutputPixelType,::itk::GetImageDimension< TInputImage >::ImageDimension > >::SetNarrowBandTotalRadius(), itk::MatrixOffsetTransformBase< TScalarType, 3, 3 >::SetOffset(), itk::ThresholdLabelerImageFilter< TInputImage, TOutputImage >::SetRealThresholds(), itk::CollidingFrontsImageFilter< TInputImage, TOutputImage >::SetSeedPoints1(), itk::CollidingFrontsImageFilter< TInputImage, TOutputImage >::SetSeedPoints2(), itk::NonUniformBSpline< TDimension >::SetSplineOrder(), itk::ThresholdLabelerImageFilter< TInputImage, TOutputImage >::SetThresholds(), itk::Statistics::GoodnessOfFitFunctionBase< TInputHistogram >::SetTotalObservedScale(), and itk::MatrixOffsetTransformBase< TScalarType, 3, 3 >::SetTranslation().
| static Pointer itk::LevenbergMarquardtOptimizer::New | ( | ) | [static] |
Method for creation through the object factory.
Reimplemented from itk::MultipleValuedNonLinearOptimizer.
| void itk::LightObject::Print | ( | std::ostream & | os, | |
| Indent | indent = 0 | |||
| ) | const [inherited] |
Cause the object to print itself out.
Referenced by itk::WeakPointer< itk::ProcessObject >::Print().
| virtual void itk::LightObject::PrintHeader | ( | std::ostream & | os, | |
| Indent | indent | |||
| ) | const [protected, virtual, inherited] |
| bool itk::Object::PrintObservers | ( | std::ostream & | os, | |
| Indent | indent | |||
| ) | const [protected, inherited] |
| void itk::MultipleValuedNonLinearVnlOptimizer::PrintSelf | ( | std::ostream & | os, | |
| Indent | indent | |||
| ) | const [protected, virtual, inherited] |
Methods invoked by Print() to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.
Reimplemented from itk::MultipleValuedNonLinearOptimizer.
| virtual void itk::LightObject::PrintTrailer | ( | std::ostream & | os, | |
| Indent | indent | |||
| ) | const [protected, virtual, inherited] |
| virtual void itk::Object::Register | ( | ) | const [virtual, inherited] |
Increase the reference count (mark as used by another object).
Reimplemented from itk::LightObject.
| void itk::Object::RemoveAllObservers | ( | ) | [inherited] |
Remove all observers .
| void itk::Object::RemoveObserver | ( | unsigned long | tag | ) | [inherited] |
Remove the observer with this tag value.
| virtual void itk::MultipleValuedNonLinearOptimizer::SetCostFunction | ( | CostFunctionType * | costFunction | ) | [virtual, inherited] |
Set the cost function.
| virtual void itk::LevenbergMarquardtOptimizer::SetCostFunction | ( | MultipleValuedCostFunction * | costFunction | ) | [virtual] |
Plug in a Cost Function into the optimizer
Implements itk::MultipleValuedNonLinearVnlOptimizer.
| void itk::MultipleValuedNonLinearVnlOptimizer::SetCostFunctionAdaptor | ( | CostFunctionAdaptorType * | adaptor | ) | [protected, inherited] |
| virtual void itk::Optimizer::SetCurrentPosition | ( | const ParametersType & | param | ) | [protected, virtual, inherited] |
Set the current position.
| void itk::Object::SetDebug | ( | bool | debugFlag | ) | const [inherited] |
Set the value of the debug flag. A non-zero value turns debugging on.
| void itk::LevenbergMarquardtOptimizer::SetEpsilonFunction | ( | double | epsilon | ) |
| static void itk::Object::SetGlobalWarningDisplay | ( | bool | flag | ) | [static, inherited] |
This is a global flag that controls whether any debug, warning or error messages are displayed.
Referenced by itk::Object::GlobalWarningDisplayOff(), and itk::Object::GlobalWarningDisplayOn().
| void itk::LevenbergMarquardtOptimizer::SetGradientTolerance | ( | double | tol | ) |
| virtual void itk::Optimizer::SetInitialPosition | ( | const ParametersType & | param | ) | [virtual, inherited] |
Set the position to initialize the optimization.
| void itk::Object::SetMetaDataDictionary | ( | const MetaDataDictionary & | rhs | ) | [inherited] |
| void itk::LevenbergMarquardtOptimizer::SetNumberOfIterations | ( | unsigned int | iterations | ) |
| virtual void itk::Object::SetReferenceCount | ( | int | ) | [virtual, inherited] |
Sets the reference count (use with care)
Reimplemented from itk::LightObject.
| void itk::Optimizer::SetScales | ( | const ScalesType & | scales | ) | [inherited] |
Set current parameters scaling.
| void itk::MultipleValuedNonLinearVnlOptimizer::SetUseCostFunctionGradient | ( | bool | ) | [inherited] |
Define if the Cost function should provide a customized Gradient computation or the gradient can be computed internally using a default approach
| void itk::LevenbergMarquardtOptimizer::SetValueTolerance | ( | double | tol | ) |
| void itk::LevenbergMarquardtOptimizer::StartOptimization | ( | void | ) | [virtual] |
Start optimization with an initial value.
Reimplemented from itk::Optimizer.
| virtual void itk::Object::UnRegister | ( | ) | const [virtual, inherited] |
Decrease the reference count (release by another object).
Reimplemented from itk::LightObject.
| void itk::MultipleValuedNonLinearVnlOptimizer::UseCostFunctionGradientOff | ( | ) | [inline, inherited] |
Definition at line 71 of file itkMultipleValuedNonLinearVnlOptimizer.h.
| void itk::MultipleValuedNonLinearVnlOptimizer::UseCostFunctionGradientOn | ( | ) | [inline, inherited] |
Definition at line 67 of file itkMultipleValuedNonLinearVnlOptimizer.h.
CostFunctionPointer itk::MultipleValuedNonLinearOptimizer::m_CostFunction [protected, inherited] |
Definition at line 76 of file itkMultipleValuedNonLinearOptimizer.h.
volatile int itk::LightObject::m_ReferenceCount [mutable, protected, inherited] |
Number of uses of this object by other objects.
Definition at line 119 of file itkLightObject.h.
SimpleFastMutexLock itk::LightObject::m_ReferenceCountLock [mutable, protected, inherited] |
Mutex lock to protect modification to the reference count
Definition at line 122 of file itkLightObject.h.
bool itk::Optimizer::m_ScalesInitialized [protected, inherited] |
Definition at line 90 of file itkOptimizer.h.
1.5.1 written by Dimitri van Heesch,
© 1997-2000