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我正在使用 Amazon Rekognition 比较加载到 python 内存中的图像之间的人脸，但是当我尝试传递裁剪的图像时，它会引发错误： InvalidParameterException: An error occurred (InvalidParameterException) when calling the CompareFaces operation: Request has Invalid Parameters

正在使用的代码示例是：

ret, frame = vid.read()
frame = cv2.resize(frame1, (0,0), fx=.5, fy=.5)
frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
content1 = cv2.imencode('.jpg',frame[:,0:540,:])[1].tostring()
content2 = cv2.imencode('.jpg',frame[:,1:540,:])[1].tostring()
awsclient=boto3.client('rekognition','us-west-2',
                    aws_access_key_id='********************',
                    aws_secret_access_key='*****************')
awsresponse = awsclient.compare_faces(SourceImage={'Bytes': content1},
                                  TargetImage={'Bytes': content2})

最后一行抛出错误。但是，如果我提交：

awsresponse = awsclient.compare_faces(SourceImage={'Bytes': content1},
                                  TargetImage={'Bytes': content1})

没有错误，人脸匹配。有没有人知道这个错误的原因？

此错误的完整跟踪：

---------------------------------------------------------------------------
InvalidParameterException                 Traceback (most recent call last)
<ipython-input-227-60437107e6df> in <module>()
      8                         aws_secret_access_key='***********')
      9 awsresponse = awsclient.compare_faces(SourceImage={'Bytes': content1},
---> 10                                   TargetImage={'Bytes': content2})

/usr/local/lib/python3.5/dist-packages/botocore/client.py in _api_call(self, *args, **kwargs)
    312                     "%s() only accepts keyword arguments." % py_operation_name)
    313             # The "self" in this scope is referring to the BaseClient.
--> 314             return self._make_api_call(operation_name, kwargs)
    315 
    316         _api_call.__name__ = str(py_operation_name)

/usr/local/lib/python3.5/dist-packages/botocore/client.py in _make_api_call(self, operation_name, api_params)
    610             error_code = parsed_response.get("Error", {}).get("Code")
    611             error_class = self.exceptions.from_code(error_code)
--> 612             raise error_class(parsed_response, operation_name)
    613         else:
    614             return parsed_response

InvalidParameterException: An error occurred (InvalidParameterException) when calling the CompareFaces operation: Request has Invalid Parameters
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