Embedding invisible water mark on image

 Firstly, install opencv

pip install opencv-python numpy

code for invisible water mark embedding 

import cv2

import numpy as np

def embed_watermark(image_path, watermark, output_path):

# Load the image

img = cv2.imread(image_path)

# Ensure the image is in 3 channels RGB

if img.shape[2] != 3:

print("Image needs to be RGB")

return

# Prepare the watermark

# For simplicity, the watermark is repeated to match the image size

watermark = (watermark * (img.size // len(watermark) + 1))[:img.size]

watermark = np.array(list(watermark), dtype=np.uint8).reshape(img.shape)

# Embed watermark by altering the least significant bit

img_encoded = img & ~1 | (watermark & 1)

# Save the watermarked image

cv2.imwrite(output_path, img_encoded)

print("Watermarked image saved to", output_path)

# Usage

embed_watermark('path_to_your_image.jpg', 'your_watermark_text', 'watermarked_image.jpg')

retrive code

def extract_watermark(watermarked_image_path, original_image_path, output_path):

# Load the watermarked and the original image

img_encoded = cv2.imread(watermarked_image_path)

img_original = cv2.imread(original_image_path)

# Extract the watermark by comparing the least significant bits

watermark = img_encoded & 1 ^ img_original & 1

watermark = (watermark * 255).astype(np.uint8) # Scale to 0-255 for visibility

# Save or display the extracted watermark

cv2.imwrite(output_path, watermark)

print("Extracted watermark saved to", output_path)

# Usage

extract_watermark('watermarked_image.jpg', 'path_to_your_image.jpg', 'extracted_watermark.jpg')