solve_deg4        207 modules/calib3d/src/p3p.cpp     int n = solve_deg4(A, B, C, D, E,  real_roots[0], real_roots[1], real_roots[2], real_roots[3]);
solve_deg4          9 modules/calib3d/src/polynom_solver.h int solve_deg4(double a, double b, double c, double d, double e,