Class lsst::jointcal::PhotometryTransformChebyshev

class PhotometryTransformChebyshev : public lsst::jointcal::PhotometryTransform

nth-order 2d Chebyshev photometry transform.

The 2-d Chebyshev polynomial used here is defined as:

$$f(x,y) = \sum_i \sum_j a_{i,j} T_i(x) T_j(y)$$

where $T_n(x)$ is the n-th order Chebyshev polynomial of $x$ and $a_{i,j}$ is the corresponding coefficient of the (i,j) polynomial term.

Note that the polynomial order=n means that the highest terms will be of the form:

$$a_{0,n}*x^n*y^0, a_{n-1,1}*x^(n-1)*y^1, ..., a_{1,n-1}*x^1*y^(n-1), a_{n,0}*x^0*y^n$$

Subclassed by lsst::jointcal::FluxTransformChebyshev, lsst::jointcal::MagnitudeTransformChebyshev