Digital Watermarking Implementation Using DWT Algorithm with Code Explanation
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Resource Overview
This code implements digital watermarking technology using Discrete Wavelet Transform (DWT) algorithm. The implementation includes watermark embedding and extraction functions, along with four different attack simulations for robustness testing. Additionally, Peak Signal-to-Noise Ratio (PSNR) measurement is performed to evaluate watermark quality.
Detailed Documentation
The code implements digital watermarking technology using Discrete Wavelet Transform (DWT) algorithm, which enables watermark insertion and extraction in digital media. The implementation includes DWT-based decomposition of host images into frequency subbands (LL, LH, HL, HH) where watermark data is strategically embedded. The system demonstrates robustness against four different types of attacks including noise addition, compression, filtering, and geometric transformations. The watermarking process involves key functions for coefficient modification in selected subbands and inverse DWT reconstruction. Furthermore, PSNR measurement is calculated between original and watermarked images to quantitatively assess the watermark's visual quality and perceptibility, with typical implementations using MATLAB's psnr() function or custom PSNR calculation based on mean squared error.
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