Python 3 Script to Compare Two Images For Similarity or Equality Using OpenCV and Numpy Library

To compare two images for similarity or equality using the Python 3 OpenCV and NumPy libraries, you can follow these steps:

Step 1: Install the opencv-python and numpy libraries using pip.

pip install opencv-python`

pip install numpy

Step 2: Create a new Python script and import the necessary modules.

import cv2
import numpy as np


def compare_images(image1_path, image2_path):
    # Read the images
    image1 = cv2.imread(image1_path)
    image2 = cv2.imread(image2_path)

    # Check if the images have the same shape
    if image1.shape != image2.shape:
        return False

    # Compute the absolute difference between the images
    difference = cv2.absdiff(image1, image2)
    difference = cv2.cvtColor(difference, cv2.COLOR_BGR2GRAY)

    # Set a threshold to consider images as equal or similar
    threshold = 30
    similarity = np.mean(difference) <= threshold

    return similarity

import cv2

import numpy as np

def compare_images(image1_path, image2_path):

# Read the images

image1 = cv2.imread(image1_path)

image2 = cv2.imread(image2_path)

# Check if the images have the same shape

if image1.shape != image2.shape:

return False

# Compute the absolute difference between the images

difference = cv2.absdiff(image1, image2)

difference = cv2.cvtColor(difference, cv2.COLOR_BGR2GRAY)

# Set a threshold to consider images as equal or similar

threshold = 30

similarity = np.mean(difference) <= threshold

return similarity

In the above code, we define the compare_images function that takes the paths of two images as input. It reads the images using cv2.imread and checks if they have the same shape. Then it calculates the absolute difference between the images using cv2.absdiff and converts it to grayscale. Finally, it computes the mean of the difference and compares it to a threshold to determine if the images are similar or equal.

Step 4: Call the compare_images function with the paths of the two images you want to compare.

image1_path = 'image1.jpg'
image2_path = 'image2.jpg'

result = compare_images(image1_path, image2_path)

if result:
    print("The images are similar.")
else:
    print("The images are not similar.")

image1_path = 'image1.jpg'

image2_path = 'image2.jpg'

result = compare_images(image1_path, image2_path)

if result:

print("The images are similar.")

else:

print("The images are not similar.")