Adaptive Thresholding.py

#import the libraries
import numpy as np
import matplotlib.pyplot as plt
import cv2
%matplotlib inline

#ADAPTIVE THRESHOLDING
gray_image = cv2.imread('index.png',0)

ret,thresh_global = cv2.threshold(gray_image,127,255,cv2.THRESH_BINARY)
#here 11 is the pixel neighbourhood that is used to calculate the threshold value
thresh_mean = cv2.adaptiveThreshold(gray_image,255,cv2.ADAPTIVE_THRESH_MEAN_C,cv2.THRESH_BINARY,11,2)

thresh_gaussian = cv2.adaptiveThreshold(gray_image,255,cv2.ADAPTIVE_THRESH_GAUSSIAN_C,cv2.THRESH_BINARY,11,2)

names = ['Original Image','Global Thresholding','Adaptive Mean Threshold','Adaptive Gaussian Thresholding']
images = [gray_image,thresh_global,thresh_mean,thresh_gaussian]

for i in range(4):
    plt.subplot(2,2,i+1),plt.imshow(images[i],'gray')
    plt.title(names[i])
    plt.xticks([]),plt.yticks([])
    
plt.show()