Frangi最初提出的计算Hessian矩阵，计算特征值，构造血管增强函数，进行血管增强，Matlab代码，可直接运行。特征值计算为c语言代码，容易将整个算法转化为C或C++，非常有用。(Frangi was first proposed to calculate the Hessian matrix, to calculate the eigenvalues, to construct the vascular enhancement function, to carry out the vascular enhancement, and to run the Matlab code. The feature value is calculated as C language code, and it is very useful to convert the whole algorithm into C or C++.)