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中文说明：用于指纹识别，对已经细化的指纹图像提取中心点。基于方向变化最大熵，提取指纹中心点。提取的中心点位置较精确。
English Description：
It is used for fingerprint recognition, and the center point of the thinned fingerprint image is extracted. Based on the maximum entropy of direction change, the fingerprint center point is extracted. The extracted center point is more accurate.基于方向变化最大熵法提取指纹中心点
..................................\coordinate.m
..................................\core2_m.asv
..................................\core2_m.m
..................................\decide_type.asv
..................................\decide_type.m
..................................\entropy.asv
..................................\entropy.m
..................................\mark.asv
..................................\mark.m
..................................\p_direction.asv
..................................\p_direction.m
..................................\p_direction2.m
..................................\P_index1.asv
..................................\P_index1.m
..................................\P_index2.asv
..................................\P_index2.m
..................................\P_index3.asv
..................................\P_index3.m
..................................\sign.asv