В большинстве случаев документация Google неполна и в ней отсутствуют такие вещи, как библиотеки, необходимые для импорта. Как просмотреть более полный пример?
Пример: https://cloud.google.com/vision/docs/detecting-faces#vision-face-detection-python
def highlight_faces(image, faces, output_filename):
"""Draws a polygon around the faces, then saves to output_filename.
Args:
image: a file containing the image with the faces.
faces: a list of faces found in the file. This should be in the format
returned by the Vision API.
output_filename: the name of the image file to be created, where the
faces have polygons drawn around them.
"""
im = Image.open(image)
draw = ImageDraw.Draw(im)
for face in faces:
box = [(vertex.x, vertex.y)
for vertex in face.bounding_poly.vertices]
draw.line(box + [box[0]], width=5, fill='#00ff00')
im.save(output_filename)
Отсутствует PIL импорт