网上参考的修改了一下，图片放在根目录，命名叫做1.png，批量人脸画口罩

这个程序的目的是为了解决人脸数据集中的特征点缺失的不足

# -*- coding: utf-8 -*-
import os
import numpy as np
from PIL import Image, ImageFile

__version__ = '0.3.0'

IMAGE_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), '')
DEFAULT_IMAGE_PATH = os.path.join(IMAGE_DIR, '1.png')

class FaceMasker:
    KEY_FACIAL_FEATURES = ('nose_bridge', 'chin')

    def __init__(self, face_path, mask_path, show=False, model='hog'):
        self.face_path = face_path
        self.mask_path = mask_path
        self.show = show
        self.model = model
        self._face_img: ImageFile = None
        self._mask_img: ImageFile = None

    def mask(self):
        import face_recognition

        face_image_np = face_recognition.load_image_file(self.face_path)
        face_locations = face_recognition.face_locations(face_image_np, model=self.model)
        face_landmarks = face_recognition.face_landmarks(face_image_np, face_locations)
        self._face_img = Image.fromarray(face_image_np)
        self._mask_img = Image.open(self.mask_path)

        found_face = False
        for face_landmark in face_landmarks:
            # check whether facial features meet requirement
            skip = False
            for facial_feature in self.KEY_FACIAL_FEATURES:
                if facial_feature not in face_landmark:
                    skip = True
                    break
            if skip:
                continue

            # mask face
            found_face = True
            self._mask_face(face_landmark)

        if found_face:
            if self.show:
                print('OK.')
                # self._face_img.show()

            # save
            self._save()
        else:
            print('Found no face.')

    def _mask_face(self, face_landmark: dict):
        nose_bridge = face_landmark['nose_bridge']
        nose_point = nose_bridge[len(nose_bridge) * 1 // 4]
        nose_v = np.array(nose_point)

        chin = face_landmark['chin']
        chin_len = len(chin)
        chin_bottom_point = chin[chin_len // 2]
        chin_bottom_v = np.array(chin_bottom_point)
        chin_left_point = chin[chin_len // 8]
        chin_right_point = chin[chin_len * 7 // 8]

        # split mask and resize
        width = self._mask_img.width
        height = self._mask_img.height
        width_ratio = 1.2
        new_height = int(np.linalg.norm(nose_v - chin_bottom_v))

        # left
        mask_left_img = self._mask_img.crop((0, 0, width // 2, height))
        mask_left_width = self.get_distance_from_point_to_line(chin_left_point, nose_point, chin_bottom_point)
        mask_left_width = int(mask_left_width * width_ratio)
        mask_left_img = mask_left_img.resize((mask_left_width, new_height))

        # right
        mask_right_img = self._mask_img.crop((width // 2, 0, width, height))
        mask_right_width = self.get_distance_from_point_to_line(chin_right_point, nose_point, chin_bottom_point)
        mask_right_width = int(mask_right_width * width_ratio)
        mask_right_img = mask_right_img.resize((mask_right_width, new_height))

        # merge mask
        size = (mask_left_img.width + mask_right_img.width, new_height)
        mask_img = Image.new('RGBA', size)
        mask_img.paste(mask_left_img, (0, 0), mask_left_img)
        mask_img.paste(mask_right_img, (mask_left_img.width, 0), mask_right_img)

        # rotate mask
        angle = np.arctan2(chin_bottom_point[1] - nose_point[1], chin_bottom_point[0] - nose_point[0])
        rotated_mask_img = mask_img.rotate(angle, expand=True)

        # calculate mask location
        center_x = (nose_point[0] + chin_bottom_point[0]) // 2
        center_y = (nose_point[1] + chin_bottom_point[1]) // 2

        offset = mask_img.width // 2 - mask_left_img.width
        radian = angle * np.pi / 180
        box_x = center_x + int(offset * np.cos(radian)) - rotated_mask_img.width // 2
        box_y = center_y + int(offset * np.sin(radian)) - rotated_mask_img.height // 2

        # add mask
        self._face_img.paste(mask_img, (box_x, box_y), mask_img)

    def _save(self):
        path_splits = os.path.splitext(self.face_path)
        new_face_path = path_splits[0]  + path_splits[1]
        new_face_path = new_face_path.replace('BLACK', 'BLACKMASK')
        self._face_img.save(new_face_path)
        print(f'Save to {new_face_path}')

    @staticmethod
    def get_distance_from_point_to_line(point, line_point1, line_point2):
        distance = np.abs((line_point2[1] - line_point1[1]) * point[0] +
                          (line_point1[0] - line_point2[0]) * point[1] +
                          (line_point2[0] - line_point1[0]) * line_point1[1] +
                          (line_point1[1] - line_point2[1]) * line_point1[0]) / \
                   np.sqrt((line_point2[1] - line_point1[1]) * (line_point2[1] - line_point1[1]) +
                           (line_point1[0] - line_point2[0]) * (line_point1[0] - line_point2[0]))
        return int(distance)


if __name__ == '__main__':
    black_folder = r"C:\Demos\face_detection1\hopenet_data\300W_LP\BLACK"
    for filename in os.listdir(black_folder):
        if filename.endswith(".jpg"):
            face_image_path = os.path.join(black_folder, filename)
            FaceMasker(face_image_path, DEFAULT_IMAGE_PATH, True, 'hog').mask()