matlab编写的Hu矩程序，提供两个可调用的函数。一个函数计算快，另一个函数结构清晰。 包含lena图像，和测试例子。

HU不变矩

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定理用途：根据其协方差矩阵来计算多元正态分布的高阶矩 Leon Isserlis在他的原始论文中通过数学归纳法证明了该定理，并推广了该定理的公式，以下是原文献 wiki: https://en.wikipedia.org/wiki/Isserlis%27_theorem

计算电磁场领域的经典教材，值得详细研读，学习有限元的可以下载