cloudvisreq.py

from __future__ import print_function
from base64 import b64encode
from os import makedirs
from os.path import join, basename
from sys import argv
import json
import requests


ENDPOINT_URL = 'https://vision.googleapis.com/v1/images:annotate'
RESULTS_DIR = 'jsons'

def make_image_data_list(image_filenames):
    """
    image_filenames is a list of filename strings
    Returns a list of dicts formatted as the Vision API
        needs them to be
    """
    img_requests = []
    with open(image_filenames, 'rb') as f:
        ctxt = b64encode(f.read()).decode()
        img_requests.append({
                'image': {'content': ctxt},
                'features': [{
                    'type': 'TEXT_DETECTION',
                    'maxResults': 1
                }]
        })
    return img_requests

def make_image_data(image_filenames):
    """Returns the image data lists as bytes"""
    imgdict = make_image_data_list(image_filenames)
    return json.dumps({"requests": imgdict }).encode()


def request_ocr(api_key, image_filenames):
    response = requests.post(ENDPOINT_URL, data=make_image_data(image_filenames), params={'key': api_key}, headers={'Content-Type': 'application/json'})
    return response


if __name__ == '__main__':
    api_key = "AIzaSyCSMpzBIKlZObk8Uzkx6Iavo967m7vFf0Q"
    image_filenames = "test/1.jpg"
    if not api_key or not image_filenames:
        print("""Please supply an api key, then one or more image filenames $ python cloudvisreq.py image1.jpg image2.png""")
    else:
        response = request_ocr(api_key, image_filenames)
        if response.status_code != 200 or response.json().get('error'):
            print(response.text)
        else:
            for idx, resp in enumerate(response.json()['responses']):
                # save to JSON file
                imgname = image_filenames[idx]
                jpath = join(RESULTS_DIR, basename(imgname) + '.json')
                with open(jpath, 'w') as f:
                    datatxt = json.dumps(resp, indent=2)
                    print("Wrote", len(datatxt), "bytes to", jpath)
                    f.write(datatxt)

                # print the plaintext to screen for convenience
                print("---------------------------------------------")
                t = resp['textAnnotations'][0]
                print("    Bounding Polygon:")
                print(t['boundingPoly'])
                print("    Text:")
                print(t['description'])