| Title |
An Adaptive Watermarking Technique for Copyright Protection of Digital Images |
| Authors |
박강서(Park, Kang-Seo) ; 이병열(Lee, Byoung-Yeol) ; 정태윤(Chung, Tae-Yun) ; 박상희(Park, Sang-Hui) |
| Keywords |
Digital Watermark ; HVS ; Parity bit ; Laplace filter |
| Abstract |
This paper proposes an new water mark embedding and extraction technique which extends the direct sequence spread spectrum technique. The proposed technique approximates the complexity of image and block in spatial domain using Laplacian filtering and watermark is adaptively embedded in the mid-frequency DCT components. Local parity bits are attached to higher-frequency DCT components and they are used to detect extraction errors and correct those errors. In extraction process the proposed method boosts the higher frequency components of image and extracts the watermark by demodulation and this information is verified and adjusted by parity bits. Experimental results show it is invisible and robust to several external attacks. |