boost::gil::lanczos
Lanczos response at point x
Synopsis
Declared in <boost/gil/image_processing/numeric.hpp>
double
lanczos(
double x,
std::ptrdiff_t a);Description
Lanczos response is defined as: x == 0: 1 ‐a < x && x < a: 0 otherwise: normalized_sinc(x) / normalized_sinc(x / a)
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