一个用来处理简单pgm格式的小程序，比如对数变换、指数变换、直方图均衡化等等，功能不多，但是很有用-Pgm format to handle a simple little program, such as log transformation, exponential transform, histogram equalization, etc., function much, but useful

C++ implementation of the image template matching algorithm based on correlation for PGM images