% @(#)interpii.hlq	19.1 (ESO-IPG) 02/25/03 14:03:27 
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%.COPYRIGHT  (c)  1990 European Southern Observatory
%.IDENT      interpii.hlq
%.AUTHOR     JDP, IPG/ESO
%.KEYWORDS   MIDAS, help files, INTERPOLATE/II
%.PURPOSE    On-line help file for the command: INTERPOLATE/II
%.VERSION    1.0  29-OCT-1985 : Creation, JDP
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\se
SECTION./II
\es\co
INTERPOLATE/II						29-OCT-1985 JDP
\oc\su
INTERPOLATE/II outima inima refima [s] [degree]
	interpolate Image to Image
\us\pu
Purpose: 
           Spline interpolation of 1D data; image to image transformation.
\up\sy
Syntax:   
           INTERPOLATE/II outima inima refima [s] [degree]
\ys\pa
           outima = name of output image
\ap\pa
           inima = name of input image
\ap\pa
           refima = reference image
\ap\pa
           s = smoothing parameter (default 1.)
\ap\pa
           degree = degree of spline     (default 3, cubic splines)
\ap\sa
See also:
           INTERPOLATE/TI, INTERPOLATE/IT, INTERPOLATE/TT
\as\no
Note: 
           The parameter s controls the degree of smoothing. This parameter
           has to be chosen carefully: too small s-values will result in
           an overfitting, too large s-values will produce an underfitting
           of the data. For s very large it returns the least-squares
           polynomial fit.
\\ 
           The number of spline knots and their positions  are determined
           automatically, taking into account the specific behaviour of
           the function underlying the data.
\\ 
           Ref.: P. Dierckxx, 1982, Computer Graphics and Image Processing,
           vol. 20, 171-184.
\on\exs
Examples:
\ex
           INTERPOLATE/II outputima inputima refima 1. 3
\xe \sxe
