sign              704 modules/calib3d/src/upnp.cpp double upnp::sign(const double v)
sign               53 modules/core/test/test_countnonzero.cpp #define sign(a) a > 0 ? 1 : a == 0 ? 0 : -1
sign               49 modules/core/test/test_eigen.cpp #define sign(a) a > 0 ? 1 : a == 0 ? 0 : -1
sign             1524 modules/imgproc/src/min_enclosing_triangle.cpp static int sign(double number) {