Sending Batch request to azure cognitive API for TEXT-OCR

[gr8Adakron]

I am calling azure cognitive API for OCR text-recognization and I am passing 10-images at the same time simultaneously (as the code below only accepts one image at a time-- that is 10-independent requests in parallel) which is not efficient to me, from processing point of view, as I need to use extra modules i.e: Celery and multiprocessing.

So, is there a way to send all the 10-images in a single request and get the output at once then do post processing?

import time
from io import BytesIO

import cv2
import requests
from PIL import Image as PILImage
from PIL import Image
file_list = []

headers = {
    "Ocp-Apim-Subscription-Key": "<API-KEY>",
    'Content-Type': 'application/octet-stream'}

p = "symbol_sample.jpg"
print(p,"p")

def recognise_text(p):
    p = cv2.imread(p)
    cropped_image = PILImage.fromarray(p)
    buffer = BytesIO()
    cropped_image.save(buffer, format="JPEG")
    image_bytes = buffer.getvalue()
    try:
        response = requests.post(
            "https://centralindia.api.cognitive.microsoft.com/vision/v2.0/recognizeText?mode=Printed",
            headers=headers,
            data=image_bytes
        )
        header_link = str(response.headers['Operation-Location'])
        while (True):
            headers_get = {
                "Ocp-Apim-Subscription-Key": "<API-KEY>"",
                'Content-Type': 'application/json'
            }
            result = requests.get(
                url=header_link,
                headers=headers_get
            )
            response_r = result.json()
            if response_r["status"] == "Succeeded":
                return response_r
            else:
                time.sleep(4)
    except Exception as e:
        print(e)
        return ""
    
image1="symbol_sample.jpg"
o = recognise_text(image1)
print(o)

Any help would be really appreciated.

[gr8Adakron]

@jdhuntington @chad @berberich @paulbatum Any help, please.

[wiazur]

Hi @gr8Adakron, not sure if you were still looking for a solution, but our Batch Read File endpoint is asynchronous. It's a different algorithm than the OCR. We also have the Read Batch File call in SDK format.

Let me know if these work, thanks.

Quickstart: https://docs.microsoft.com/en-us/azure/cognitive-services/computer-vision/quickstarts/python-hand-text

Batch Read File API: https://centralindia.dev.cognitive.microsoft.com/docs/services/5cd27ec07268f6c679a3e641/operations/2afb498089f74080d7e196fc

Batch Read File SDK: https://docs.microsoft.com/en-us/python/api/azure-cognitiveservices-vision-computervision/azure.cognitiveservices.vision.computervision.operations.computervisionclientoperationsmixin?view=azure-python#batch-read-file-url--custom-headers-none--raw-false----operation-config-