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no idea if it solves your problem, but to reconstruct src, it would be like:

Mat_<float> src(5,5), W,U,VT;
src  << 1,2,3,4,5,
        1,2,3,4,5,
        1,2,3,4,5,
        1,2,3,4,5,
        1,2,3,4,5;

SVDecomp(src, W, U, VT, SVD::FULL_UV);

Mat_<float> WD(5,5);
W.copyTo(WD.diag());

Mat rec = VT.t() * WD * U.t();
cout << rec << endl;

[1.0000001, 1.0000001, 1.0000001, 1.0000001, 1.0000001;
 2.0000002, 2.0000002, 2.0000002, 2.0000002, 2.0000002;
 3, 3, 3, 3, 3;
 4.0000005, 4.0000005, 4.0000005, 4.0000005, 4.0000005;
 5.0000005, 5.0000005, 5.0000005, 5.0000005, 5.0000005]

(it returns the transposed src / result)