attempt to make the ultimate fix for the failure in Core_Invert.small

modules/core/src/lapack.cpp

@@ -1095,27 +1095,30 @@ double cv::invert( InputArray _src, OutputArray _dst, int method )
             if( type == CV_32FC1 )
             {
                 double d = det3(Sf);
-                if( d != 0. )
-                {
-                    double t[12];
 
+				if( fabs(d) < 1e-4 || fabs(d) > 1e4 )
+					result = invert(src, dst, DECOMP_SVD) > 0;
+				else
+				{
+					float t[12];
+		            float df = (float)(1./d);
 					result = true;
-                    d = 1./d;
-                    t[0] = (((double)Sf(1,1) * Sf(2,2) - (double)Sf(1,2) * Sf(2,1)) * d);
-                    t[1] = (((double)Sf(0,2) * Sf(2,1) - (double)Sf(0,1) * Sf(2,2)) * d);
-                    t[2] = (((double)Sf(0,1) * Sf(1,2) - (double)Sf(0,2) * Sf(1,1)) * d);
 
-                    t[3] = (((double)Sf(1,2) * Sf(2,0) - (double)Sf(1,0) * Sf(2,2)) * d);
-                    t[4] = (((double)Sf(0,0) * Sf(2,2) - (double)Sf(0,2) * Sf(2,0)) * d);
-                    t[5] = (((double)Sf(0,2) * Sf(1,0) - (double)Sf(0,0) * Sf(1,2)) * d);
+					t[0] = (Sf(1,1) * Sf(2,2) - Sf(1,2) * Sf(2,1)) * df;
+					t[1] = (Sf(0,2) * Sf(2,1) - Sf(0,1) * Sf(2,2)) * df;
+					t[2] = (Sf(0,1) * Sf(1,2) - Sf(0,2) * Sf(1,1)) * df;
+
+					t[3] = (Sf(1,2) * Sf(2,0) - Sf(1,0) * Sf(2,2)) * df;
+					t[4] = (Sf(0,0) * Sf(2,2) - Sf(0,2) * Sf(2,0)) * df;
+					t[5] = (Sf(0,2) * Sf(1,0) - Sf(0,0) * Sf(1,2)) * df;
 
-                    t[6] = (((double)Sf(1,0) * Sf(2,1) - (double)Sf(1,1) * Sf(2,0)) * d);
-                    t[7] = (((double)Sf(0,1) * Sf(2,0) - (double)Sf(0,0) * Sf(2,1)) * d);
-                    t[8] = (((double)Sf(0,0) * Sf(1,1) - (double)Sf(0,1) * Sf(1,0)) * d);
+					t[6] = (Sf(1,0) * Sf(2,1) - Sf(1,1) * Sf(2,0)) * df;
+					t[7] = (Sf(0,1) * Sf(2,0) - Sf(0,0) * Sf(2,1)) * df;
+					t[8] = (Sf(0,0) * Sf(1,1) - Sf(0,1) * Sf(1,0)) * df;
 
-                    Df(0,0) = (float)t[0]; Df(0,1) = (float)t[1]; Df(0,2) = (float)t[2];
-                    Df(1,0) = (float)t[3]; Df(1,1) = (float)t[4]; Df(1,2) = (float)t[5];
-                    Df(2,0) = (float)t[6]; Df(2,1) = (float)t[7]; Df(2,2) = (float)t[8];
+					Df(0,0) = t[0]; Df(0,1) = t[1]; Df(0,2) = t[2];
+					Df(1,0) = t[3]; Df(1,1) = t[4]; Df(1,2) = t[5];
+					Df(2,0) = t[6]; Df(2,1) = t[7]; Df(2,2) = t[8];
 				}
             }
             else