run.py

from flask import Flask, request, Response
import jsonpickle
import numpy as np
import cv2

app = Flask(__name__)

@app.route('/')
def hello():
    return 'Hello World!'

@app.route('/stopzone', methods=['POST'])
def upload_file():
    r = request
    # convert string of image data to uint8
    nparr = np.fromstring(r.data, np.uint8)
    # decode image
    img = cv2.imdecode(nparr, cv2.IMREAD_COLOR)

    # do some fancy processing here....

    # build a response dict to send back to client
    response = {'stopzone': 'stopzone. size={}x{}'.format(img.shape[1], img.shape[0])
                }
    # encode response using jsonpickle
    response_pickled = jsonpickle.encode(response)

    return Response(response=response_pickled, status=200, mimetype="application/json")

if __name__ == '__main__':
    app.run()