三维隐函数绘制的应用，它灵活的应用了Matlab的isosurface()(等值面函数)，绘制出来的图效果还比较好MATLAB图像特征值提取基本思想、特点及研究近况-Implicit function rendering three-dimensional applications, it flexible application of Matlab isosurface () (isosurface function), plotted in Fig effect is still relat