OCR over an openCV image with tesseract - extract from https://github.com/fpaupier/gRPC-multiprocessing

ocr.py

def get_text_from_image(img: bytes) -> str:
    """
    Perform OCR over an image.

    Args:
        img (bytes) : a pickled image - encoded with openCV.

    Returns:
        The text found in the image by the OCR module.

    """
    # By default OpenCV stores images in BGR format and since pytesseract assumes RGB format,
    # we need to convert from BGR to RGB format/mode:
    img_rgb = cv2.cvtColor(pickle.loads(img), cv2.COLOR_BGR2RGB)
    return pytesseract.image_to_string(img_rgb)