상세정보
학술대회
Two-Step Detection Algorithm in a HVS-Based Blind Watermarking of Still Images
- 저자
- 김용철, 최병철
- 발행일
- 200211
- 출처
- International Workshop on Digital Watermarking (IWDW) 2002 (LNCS 2613), v.2613, pp.235-248
- 협약과제
- 02MK2100, 차세대 능동형 네트워크 정보보호 시스템 개발, 박치항
- 초록
- In this paper, we propose a DCT-bascd blind watermarking system, with detection performed in a two-step algorithm. In embedding, each bit is inserted in a PN spreading pattern in 12 positions of DCT coefficients of an 8x8 block. The watermark gain, a, is optimized in robustness and invisibility. In detection process, a preliminary decision is obtained by correlation matching and then verified by choosing the more similar spreading pattern with the restored one. Most of bit errors are corrected in verificiation process. The poposed method has been tested for several test images, with attacks including lowpass/median filtering and JPEG compression, but excluding geometrical RST attacks. After verificiation, BER reduces to 0.5% with no attack. Even under heavey JPEG compression, BER stays lower than 9%. Compared with other methods, the proposed method is better in watermark detection and far exceeds others in watermark size. © Springer-Verlag Berlin Heidelberg 2003.
- KSP 제안 키워드
- Blind watermarking, Correlation matching, DCT coefficients, Detection algorithm, Jpeg Compression, Median Filtering, Step Detection, Still image, bit error, detection process, two-step algorithm