message: create homogeneous affine matrix when constructing from 4x3 cv::Mat
diff: @@ -213,11 +213,13 @@ cv::Affine3<T>::Affine3(const cv::Mat& data, const Vec3& t)
  {
  rotation(data(Rect(0, 0, 3, 3)));
  translation(data(Rect(3, 0, 1, 3)));
  - return;
  }
  -
  + else
  + {
  rotation(data);
  translation(t);
  + }
  +
  matrix.val[12] = matrix.val[13] = matrix.val[14] = 0;
  matrix.val[15] = 1;
  }
  