VC编写的将彩色图像转化为灰度图像，代码不多，但很有研究意义-VC prepared by converting color images to grayscale, the code much, but useful research significance

对输入图像进行判断是否为三维，若是则转化为二维，然后在用灰度图像进行水平和垂直投影-The input image is to determine whether the 3D into 2D, if it is, then the horizontal and vertical projection in gray image