SNIP_ |
SNIP algorithm for background estimation on linear (unmodified) data.
SNIP = Statistics-sensitive Non-linear Iterative Procedure.
Inheritance HierarchySystemObject
Altaxo.Science.Spectroscopy.BaselineEstimationSNIP_Base
Altaxo.Science.Spectroscopy.BaselineEstimationSNIP_Linear
Altaxo.Science.Spectroscopy.BaselineEstimationSNIP_Base
Altaxo.Science.Spectroscopy.BaselineEstimationSNIP_Linear
Namespace: Altaxo.Science.Spectroscopy.BaselineEstimation
Assembly: AltaxoCore (in AltaxoCore.dll) Version: 4.8.3448.0 (4.8.3448.0)
SyntaxC#
public class SNIP_Linear : SNIP_Base, IBaselineEstimation, ISingleSpectrumPreprocessor, IEquatable<SNIP_Linear>
The SNIP_Linear type exposes the following members.
Constructors| Name | Description | |
|---|---|---|
 | SNIP_Linear | Initializes a new instance of the SNIP_Linear class |
Properties| Name | Description | |
|---|---|---|
 | HalfWidth |
Gets half of the width of the averaging window.
(Inherited from SNIP_Base) |
| IsHalfWidthInXUnits |
Gets a value indicating whether HalfWidth is specified in x-axis units.
(Inherited from SNIP_Base) |
| NumberOfRegularIterations |
Gets the number of regular iterations.
The default is 40.
(Inherited from SNIP_Base) |
Methods| Name | Description | |
|---|---|---|
 | EvaluateBaselineWithConstantHalfWidth |
Executes the algorithm to estimate the baseline for the provided spectrum.
This method is specialized for (almost) equally spaced x-values; thus the half width can be given in points.
(Inherited from SNIP_Base) |
| EvaluateBaselineWithLocalHalfWidth |
Executes the algorithm using a locally calculated half width.
This method is specialized for non-uniformly spaced x-values and a half width specified in x-units.
The half width in points is calculated individually for each point.
(Inherited from SNIP_Base) |
| Execute(Double, Double, Int32) | (Inherited from SNIP_Base) |
| Execute(ReadOnlySpanDouble, ReadOnlySpanDouble, SpanDouble) |
Executes the algorithm for the provided spectrum and writes the estimated baseline into result.
(Inherited from SNIP_Base) |
| Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object) |
| GetType | Gets the Type of the current instance. (Inherited from Object) |
| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object) |
| ToString | (Overrides SNIP_Base.ToString) |
Fields| Name | Description | |
|---|---|---|
 | _halfWidth | (Inherited from SNIP_Base) |
| _isHalfWidthInXUnits | (Inherited from SNIP_Base) |
| _numberOfRegularStages | (Inherited from SNIP_Base) |
Remarks
In contrast to the procedure described in Ref. [1], no previous smoothing is applied to the data. Furthermore,
the paper suggests applying a double logarithm transform beforehand, which is also not done here.
As described in the paper, after executing the regular stages of the algorithm, the window width is successively decreased until it reaches 1.
This results in smoothing of the background signal.
References:
[1] C.G. Ryan et al., SNIP, A STATISTICS-SENSITIVE BACKGROUND TREATMENT FOR THE QUANTITATIVE ANALYSIS OF PIXE SPECTRA IN GEOSCIENCE APPLICATIONS, Nuclear Instruments and Methods in Physics Research 934 (1988) 396-402 North-Holland, Amsterdam
See Also