结合opencv与VC++ 6.0 求解行列式的数值-Opencv combined with VC++ 6.0 numerical solving determinant

海森差分行列式值,可在匹配时设定一定的阈值，从而减少匹配时间。(Hessian difference determinant value can be set to a certain threshold in the matching, so as to reduce the matching time.)