opencv2 → img_hash 关系

opencv2 中的文件	opencv2/img_hash 目录下的文件
img_hash.hpp	average_hash.hpp
img_hash.hpp	block_mean_hash.hpp
img_hash.hpp	color_moment_hash.hpp
img_hash.hpp	marr_hildreth_hash.hpp
img_hash.hpp	phash.hpp
img_hash.hpp	radial_variance_hash.hpp