Censor text in an image with Python

censor_image.py

import cv2, pytesseract
import numpy as np
AVERAGE = 100
EXTRA = 1
MIN_TEXT = 4

def censor_image(input_file):
    image = cv2.imread(input_file)
    transparent_img = np.zeros((image.shape[0], image.shape[1], image.shape[2]), dtype=np.uint8)
    data = pytesseract.image_to_data(image, output_type='dict')
    boxes = len(data['level'])
    for i in range(boxes):
        if len(data['text']) < MIN_TEXT: continue
        (x, y, w, h) = (data['left'][i], data['top'][i], data['width'][i], data['height'][i])
        x = x - w * extra
        y = y - h * extra
        w = w * extra * 3
        h = h * extra * 3
        if x < 0: x = 0
        if y < 0: y = 0
        if y + h > image.shape[0]: y = image.shape[0] - h
        if x + w > image.shape[1]: x = image.shape[1] - w
        img = cv2.blur(image[y:y+h, x:x+w], (AVERAGE, AVERAGE))
        image[y:y+h, x:x+w] = img
    cv2.imwrite(input_file, image)