getting_ocr.py

__author__ = "Abhijay, Neeraj and Nitish"
__credits__ = ["Abhijay, Neeraj and Nitish"]
__license__ = "GPL"
__version__ = "1.0.1"
__maintainer__ = "Nitish (Git: @nitish11)"
__status__ = "Development"


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

ENDPOINT_URL = 'https://vision.googleapis.com/v1/images:annotate'
RESULTS_DIR = 'jsons'
if not os.path.exists(RESULTS_DIR):
    makedirs(RESULTS_DIR)

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 = []
    for imgname in image_filenames:
        with open(imgname, '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



def get_tag_information(image_filenames):
    # api_key = 'AIzaSyC2Z6fymVj-StfrX7AeTJKp3l7Mo0ELc7I' 
    api_key = 'AIzaSyCzemskXK5JabNNLy6fnwMD-hQfws0jFE4'

    if not api_key or not image_filenames:
        print("""
            Please supply an api key, then one or more image filenames

            $ python cloudvisreq.py api_key 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'])
    return