Two-point baseline correction

Two-Point Linear Baseline. Another approach is the tried-and-true method of selecting two baseline points in the spectrum, connecting them with a line, and subtracting them from the spectral responses. This is known as a two-point baseline correction. 

A sloping baseUne, one that has a Unear slope from one end of the spectrum of the other, can simply be corrected by subtraction of a ramp function from the absorbance spectrum (two-point baseline correction). Most spectral software incorporates this correction, and the user simply picks a point on the baseUne at one end of the spectrum and a second point at the other end. A linear interpolation is made through the two points, and resulting Une is subtracted from the spectrum. 

An extension of two-point baseline correction is to correct a nonlinear baseline with a series of linear interpolations. If the slope of the basehne changes slowly, this method can give acceptable results. Several points can be picked along the baseline, and a linear interpolation is made between each pair of points. Each interpolated section is subtracted from the spectmm. If the baseline does not have a slope that changes slowly, a curved or undulating baseline may result. In addition, basehne discontinuities or abrupt changes in relative slope may result. Nonetheless, this is a useful correction if the original baseline only varies slowly. 

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See also in sourсe #XX -- [ , ]

See also in sourсe #XX -- [ ]

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