Class lsst::afw::math::LanczosFunction1¶
-
template<typename
ReturnT
>
classLanczosFunction1
: public lsst::afw::math::Function1<ReturnT>¶ 1-dimensional Lanczos function
f(x) = sinc(pi x’) sinc(pi x’ / n) where x’ = x - xOffset and coefficient c0 = xOffset
Warning: the Lanczos function is sometimes forced to 0 if |x’| > n but this implementation does not perform that truncation so as to improve Lanczos kernels.