Digital Watermarking Technology Based on Image Fusion

This MATLAB implementation demonstrates digital watermarking technology based on image fusion. The technique embeds watermark information into images to protect copyright and ensure authenticity. Digital watermarking has diverse applications in areas such as digital media and information security. The implementation utilizes various image fusion algorithms to embed watermarks into original images while maintaining image quality and clarity. MATLAB's image processing toolbox provides essential functions like imread() for image loading, imshow() for visualization, and imwrite() for saving processed images. Key algorithms may include discrete wavelet transform (DWT) for frequency domain embedding or spatial domain techniques using alpha blending. For performance validation, built-in test images are provided to evaluate watermark effectiveness and visibility. The coding approach typically involves: - Preprocessing both host and watermark images using imresize() and rgb2gray() - Implementing fusion algorithms through matrix operations and transform functions - Calculating metrics like PSNR (Peak Signal-to-Noise Ratio) using psnr() function - Extracting watermarks using reverse fusion processes This MATLAB-based solution offers an accessible framework for implementing digital watermarking, providing protection and security for various application scenarios through efficient code structure and comprehensive testing capabilities.