<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def process_frames_mouth(self, frames):
 """ Preprocess from frames using mouth detector """

        self.face = np.array(frames)
        self.mouth = np.array(frames)
        self.set_data(frames)