A New Method For Digital Watermarking Based on Combination of DCT and PCA
This work addresses digital watermarking for image security, presenting an incremental improvement over existing DCT-based techniques.
The authors tackled the problem of digital watermarking by proposing a new method combining DCT and PCA transforms to embed watermarks in the low-frequency band, resulting in improved robustness, maintained image quality, and increased watermark capacity compared to other DCT methods.
In the digital watermarking with DCT method,the watermark is located within a range of DCT coefficients of the cover image. In this paper to use the low-frequency band, a new method is proposed by using a combination of the DCT and PCA transform. The proposed method is compared to other DCT methods, our method is robust and keeps the quality of cover image, also increases capacity of the watermarking.