code: def annotate_image(self, request, retry=None, timeout=None):
          
          # If the image is a file handler, set the content.
          image = protobuf.get(request, "image")
          if hasattr(image, "read"):
              img_bytes = image.read()
              protobuf.set(request, "image", {})
              protobuf.set(request, "image.content", img_bytes)
              image = protobuf.get(request, "image")
  
          # If a filename is provided, read the file.
          filename = protobuf.get(image, "source.filename", default=None)
          if filename:
              with io.open(filename, "rb") as img_file:
                  protobuf.set(request, "image.content", img_file.read())
                  protobuf.set(request, "image.source", None)
  
          # This method allows features not to be specified, and you get all
          # of them.
          protobuf.setdefault(request, "features", self._get_all_features())
          r = self.batch_annotate_images([request], retry=retry, timeout=timeout)
          return r.responses[0]
docs: Run image detection and annotation for an image.
  
          Example:
              >>> from google.cloud.vision_v1 import ImageAnnotatorClient
              >>> client = ImageAnnotatorClient()
              >>> request = {
              ...     'image': {
              ...         'source': {'image_uri': 'https://foo.com/image.jpg'},
              ...     },
              ... }
              >>> response = client.annotate_image(request)
  
          Args:
              request (:class:`~.vision_v1.types.AnnotateImageRequest`)
              retry (Optional[google.api_core.retry.Retry]):  A retry object used
                  to retry requests. If ``None`` is specified, requests will not
                  be retried.
              timeout (Optional[float]): The amount of time, in seconds, to wait
                  for the request to complete. Note that if ``retry`` is
                  specified, the timeout applies to each individual attempt.
  
          Returns:
              :class:`~.vision_v1.types.AnnotateImageResponse` The API response.