二维投影相关法是基于二维投影的灰度相关匹配算法，主要利用匹配图像相邻像素的灰度值的大小关系

应该相同的原理进行图像匹配。该算法不仅大大减少了数据的维数，而且算法主要涉及（0,1）整数运算。与去均值

归一化互相关算法相比，其在保证匹配精度要求的前提下提高了匹配速度。

-Two-dimensional projection-related method is based on two-dimensional projection of the gray correlation matching algorithm, the main advantage of matching the image gray values of adjacent pixels the size of the relationship should be the same principle for image matching. The algorithm not only greatly reduce the data dimension, and the algorithm is mainly related to (0,1) integer arithmetic. And to the mean normalized cross-correlation algorithm, its accuracy in ensuring the match under the premise of improved matching speed.