signd             341 modules/calib3d/src/homography_decomp.cpp     int e12 = signd(M12);
signd             342 modules/calib3d/src/homography_decomp.cpp     int e02 = signd(M02);
signd             343 modules/calib3d/src/homography_decomp.cpp     int e01 = signd(M01);
signd             384 modules/calib3d/src/homography_decomp.cpp     double ESii = signd(S(indx, indx)) ;