다중화 복호화 키들을 이용한 실질적인 영상 워터마크

• 영문명: Practical Image Watermark Using Multi-Decoding Keys
• 발행기관: 한국항해항만학회
• 저자명: 이형석(Hyung-Seok Lee) 서동환(Dong-Hoan Seo)
• 간행물 정보: 『한국항해항만학회 학술대회논문집』2008년도 공동학술대회 지구환경변화와 해양산업의 전망 논문집, 329~330쪽, 전체 2쪽
• 주제분류: 공학 > 해양공학
• 파일형태: PDF
• 발행일자: 2008.06.30

영문 초록

In this paper, we propose a practical image watermark method using multi-level decoding keys. A zero-padded original images are Fourier transformed and its real-valued data denotes an encoded image in the embedding process. The multiplication between the spreaded encrytion image and Walsh code image is used as a hidden image. Here, this spreaded hidden image is the same size and shape of the walsh code. A host image is then made from the linear superposition of weighted hidden image and a cover image. The original image is simply obtained by the inverse-Fourier transform and a despread process of the product of the host image and multi-level decoding keys which are generated by Walsh code and the imaginary part of encoded image in the reconstruction process. The embedding process and the reconstruction process are performed digitally. Computer simulations demonstrate the efficiency of the proposed technique that can be decryped with only one hierarchical decryption key image and a good robustness to the external attacks such as cropping.

목차

Abstract

1. 서론

2. 제안한 워터마크 및 복호화 방법

3. 실험

4. 결론

참고문헌

키워드

Watermark Walsh code Multi-decoding keys