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greetings , new Odoo user here 

i have a project for face recognition and want to turn it into an Odoo (v12.0) module ,the code takes a picture (test.jpg) from a folder and compare it to other ones and displays the result in a new windows , but  i want to try and upload an image to my custom module then read that image from the database and compare it to pictures either on my hard-drive (or on the odoo database )
(the face_trigger function is linked to a button that will trigger the whole process)

 how can i read the image from the database and use it as input for the face detection program.
 
my code is shown below , any help will be appreciated 

# -*- coding: utf-8 *-
from odoo import models, fields, _, api
import face_recognition as fr
import os
import cv2
import face_recognition
import numpy as np


class HospitalPatient(models.Model):
    _name = 'hospital.patient'
    _description = 'Patient Record'
    patient_name = fields.Char(string='Name', required='True')
    patient_age = fields.Integer('Age')
    notes = fields.Text(string='Notes')
    image = fields.Binary(string='Image',required='True')
    @api.multi
    def face_trigger(self):
        def get_encoded_faces():
            """
            looks through the faces folder and encodes all
            the faces
            :return: dict of (name, image encoded)
            """
            encoded = {}
            for dirpath, dnames, fnames in os.walk("./faces"):
                for f in fnames:
                    if f.endswith(".jpg") or f.endswith(".png"):
                        face = fr.load_image_file("faces/" + f)
                        encoding = fr.face_encodings(face)[0]
                        encoded[f.split(".")[0]] = encoding
            return encoded
        def unknown_image_encoded(img):
            face = fr.load_image_file("faces/" + img)
            encoding = fr.face_encodings(face)[0]
            

            return encoding
        def classify_face(im):
            """
            will find all of the faces in a given image and label
            them if it knows what they are
            :param im: str of file path
            :return: list of face names
            """
            faces = get_encoded_faces()
            faces_encoded = list(faces.values())
            known_face_names = list(faces.keys())
            img = cv2.imread(im, 1)
            # img = cv2.resize(img, (0, 0), fx=0.5, fy=0.5)
            # img = img[:,:,::-1]
            face_locations = face_recognition.face_locations(img)
            unknown_face_encodings = face_recognition.face_encodings(img,                                                 face_locations)
            face_names = []
            for face_encoding in unknown_face_encodings:
                # See if the face is a match for the known face(s)
                matches = face_recognition.compare_faces(faces_encoded, face_encoding)
                name = "Unknown"
                # use the known face with the smallest distance to the new face
                face_distances = face_recognition.face_distance(faces_encoded,                                                  face_encoding)
                best_match_index = np.argmin(face_distances)
                if matches[best_match_index]:
                    name = known_face_names[best_match_index]
                face_names.append(name)
                for (top, right, bottom, left), name in zip(face_locations,                                                 face_names):
                    # Draw a box around the face
                    cv2.rectangle(img, (left - 20, top - 20), (right + 20, bottom +                                                 20), (255, 0, 0), 2)
                    # Draw a label with a name below the face
                    cv2.rectangle(img, (left - 20, bottom - 15), (right + 20, bottom +                                         20), (255, 0, 0), cv2.FILLED)
                    font = cv2.FONT_HERSHEY_DUPLEX
                    cv2.putText(img, name, (left - 20, bottom + 15), font, 1.0, (255,                                         255, 255), 2)
            # Display the resulting image
            while True:
                cv2.imshow('Video', img)
                if cv2.waitKey(1) & 0xFF == ord('q'):
                    return face_names
        print(classify_face("test.jpg"))

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