颜色矩是一种简单有效的颜色特征表示方法，有一阶矩(均值,mean)、二阶矩(方差,viarance)和三阶矩(斜度,skewness)等，由于颜色信息主要分布于低阶矩中，所以用一阶矩，二阶矩和三阶矩足以表达图像的颜色分布，颜色矩已证明可有效地表示图像中的颜色分布。本代码很好的实现了对图片颜色矩的提取，并有详细的注释。(Color moment is said a simple and effective method of color feature, a moment (mean, mean), the two order moment (variance, viarance) and three moments (slope, skewness), because the color information is mainly distributed in the low order moment, so for a moment, the two and three order moments moment to express the image color distribution, color moments have been shown to be effective for representation of color distribution. This code is very good to achieve the color of the image extraction of the moment, and detailed notes.)