import cv2
import numpy as np 
img = cv2.imread('bookpage.jpg')

retval, threshold = cv2.threshold(img, 12,255,cv2.THRESH_BINARY)
grayscaled = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
retval2 , threshold2 = cv2.threshold(grayscaled, 12, 255, cv2.THRESH_BINARY)
gaus = cv2.adaptiveThreshold(grayscaled, 255,cv2.ADAPTIVE_THRESH_GAUSSIAN_C, cv2.THRESH_BINARY, 115, 1)

cv2.imshow('simple',img)
cv2.imshow('threshold1',threshold)
cv2.imshow('threshold2',threshold2)
cv2.imshow('GAUS',gaus)
cv2.waitKey(0)
cv2.destroyAllWindows()
