Intelligent lock and face recognition optimization method applied to intelligent lock

The invention discloses an intelligent lock which comprises a battery and a circuit board powered by the battery. The invention further discloses a face recognition optimization method for applying the intelligent lock to the intelligent lock. The face recognition optimization method comprises the following steps that a face recognition module is used for collecting a face graph and defining a face area frame; regularly generating a two-dimensional array in the face area frame and dividing the two-dimensional array into a plurality of rectangular outer frames; extracting a plurality of rectangular outer frames containing corresponding five-sense-organ feature frames through a face detector; analyzing each rectangular outer frame one by one; defining four vertex coordinates of the five-sense-organ feature box, taking the coordinates as reference coordinates, extracting all line segments in the rectangular outer frame, screening the line segments so as to quickly abandon the line segments which do not pass thro