do u know how can i keep only the page number ?

[konos93]

i used this

import sys
import cv2
from matplotlib import pyplot as plt

def GetBoundingRectangles(IMG_PATH, output_path):
img = cv2.imread(IMG_PATH)
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
gray2 = gray.copy()
ret, thresh = cv2.threshold(gray, 127, 255, cv2.THRESH_BINARY_INV + cv2.THRESH_OTSU)
contours, hier = cv2.findContours(thresh, cv2.RETR_LIST, cv2.CHAIN_APPROX_SIMPLE)

secs = []
for cnt in contours:
    if 550 < cv2.contourArea(cnt) < 1050:
        (x, y, w, h) = cv2.boundingRect(cnt)
        cv2.rectangle(gray2, (x, y), (x+w, y+h), 0)
        secs.append(gray2[y:y+h, x:x+w])


cv2.imwrite(output_path, gray2)

image_path = 'a.jpg'
output_path = 'processed_image.jpg'
GetBoundingRectangles(image_path, output_path)

on that

the result is like that

do u know how can i keep only the page number area ?
the page number usually is top left , top right , bottom left , bottom right or in the middle down

do u know how can i white everything outside the black boxes inside the image and keep anything inside