LSB Digital Watermarking Algorithm Implementation

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Resource Overview

A MATLAB-implemented LSB-based digital watermarking algorithm that embeds binary image watermarks into BMP grayscale images. The watermark is expanded to match the original image size and repeatedly embedded for enhanced robustness. The algorithm includes PSNR calculation for evaluating watermarking quality and provides code-level implementation details.

Detailed Documentation

This article presents an LSB-based digital watermarking algorithm implemented in MATLAB. The algorithm embeds binary image watermarks into BMP grayscale images by first expanding the watermark to match the original image dimensions, then performing repeated embedding to improve robustness. The implementation involves modifying the least significant bits of pixel values using bitwise operations, with the embedding strength controlled through parameter tuning. Additionally, the algorithm calculates Peak Signal-to-Noise Ratio (PSNR) values to quantitatively evaluate the watermarking effect. The MATLAB code utilizes image processing functions like imread(), imresize(), and bit manipulation operations to achieve efficient watermark embedding while maintaining image quality. Through this approach, we can extend the methodology while preserving its core principles.

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