[ Basic Info | References | User Guide ]
Basic Information on impoly
Task: impoly
Purpose: Flat field subtraction using a 2D polynomial fit
Categories: map combination
IMPOLY (IMage POLYnomial subtraction) is a MIRIAD task which
performs a polynomial least squares fit to a specified
x-y region of each plane of a cube and subtracts this
fit from the entire plane.
Key: in
The input image. No default.
Key: out
The output image. No default.
Key: order
The degree of the highest term of the polynomial fit.
It is not possible to have a different order of the polynomial
in X and Y. Default is zero (i.e. fit a constant).
Key: coeffs
A logical, specifying whether you want to see fitted polynomial
coefficients. Default: no.
Note: the coefficients are defined w.r.t. the reference pixel,
and are in pixel units.
Key: region
Full region specifications are supported.
Default: the entire image.