Digital Watermarking Based on Discrete Wavelet Transform

This paper discusses a MATLAB-implemented digital watermarking code based on Discrete Wavelet Transform (DWT). The code implements an advanced watermark embedding system that inserts proprietary information into digital images for ownership protection and identification. By utilizing frequency domain embedding through wavelet decomposition, the algorithm preserves image quality while enabling robust watermark verification. The implementation typically involves key MATLAB functions such as wavedec2 for 2D wavelet decomposition, waverec2 for reconstruction, and careful coefficient modification in specific subbands (HL, LH, or HH) to embed watermark data. This DWT-based digital watermarking solution serves as an effective tool for multiple applications including copyright protection, image authentication, and information security, with the code providing configurable parameters for embedding strength and wavelet type selection to balance visibility and robustness.