fft5_2            537 modules/core/src/dxt.cpp     static const T fft5_2 = (T)0.559016994374947424102293417182819;
fft5_2            842 modules/core/src/dxt.cpp                     r1 = fft5_2*(r1 - r2); i1 = fft5_2*(i1 - i2);
fft5_2            109 modules/core/src/opencl/fft.cl     b1 = fft5_2 * (b1 - a4);