DFTFactorize     1931 modules/core/src/dxt.cpp         int nf = DFTFactorize(cols, factors);
DFTFactorize     2663 modules/core/src/dxt.cpp                 nf = DFTFactorize( len, factors );
DFTFactorize     3550 modules/core/src/dxt.cpp                 nf = DFTFactorize( len, factors );