A python script to blur images

blur.py

import cv2
import sys
import numpy as np

BLUR_LOW = 20
BLUR_MED = 50
BLUR_HIGH = 100

def adjust_gamma(image, gamma=1.0):
	# from: https://www.pyimagesearch.com/2015/10/05/opencv-gamma-correction/
	invGamma = 1.0 / gamma
	table = np.array([((i / 255.0) ** invGamma) * 255
		for i in np.arange(0, 256)]).astype("uint8")
	return cv2.LUT(image, table)

if __name__ == '__main__':
    # Arguments: image_filename, output_filename
    if len(sys.argv) != 3:
        print("Usage: python3 blur.py image_filename output_filename")
        exit(1)

    image_filename = sys.argv[1]
    output_filename = sys.argv[2]

    blur_level = BLUR_MED

    # Read image
    img = cv2.imread(image_filename)

    # Apply blur to image
    blur = cv2.GaussianBlur(img, (blur_level + 1, 0), sigmaX=blur_level, sigmaY=blur_level)
    blur = cv2.GaussianBlur(blur, (0, blur_level + 1), sigmaX=blur_level, sigmaY=blur_level)

    # Increase brightness
    blur = adjust_gamma(blur, 1.5)

    # Save image
    cv2.imwrite(output_filename, blur)