Journal of the Institute of Electronics Engineers of Korea SP (대한전자공학회논문지SP)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Digital Watermarking using Wavelet Packet Transform for Remote Sensing Images

웨이블릿 패킷 변환을 이용한 원격 영상의 워터마킹 기법

  • Published : 2003.09.01
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Abstract

In this paper, a new watermarking algorithm that based on wavelet packet transform is proposed for remote sensing images, which include many high frequency components. It applies watermark to the overall subband that includes the lowest frequency band. Watermark is embedded on original image after selecting the significant wavelet packet coefficients. For selection of significant coefficients which watermarks is embedded on, zerotree algorithm is applied to wavelet packet coefficients using CPSO (Coefficient Partitioning Scanning Order). From the experimental result, the proposed algorithm shows better invisibility and robustness performance compare with conventional watermarking methods. Especially, it demonstrates better robustness for high image compression in the remote images.

항공이나 위성 영상과 같이 고주파 성분을 많이 포함하고 있는 영상에 워터마크를 삽입하기 위해 웨이블릿 패킷 변환을 이용한 새로운 워터마킹 방법을 제안한다. 제안된 워터마킹 알고리즘은 최저 주파수대역을 포함한 전대역에 걸쳐 워터마크를 삽입한다. 워터마크는 웨이블릿 패킷 계수 중에서 중요계수를 선택한 후에 원 영상에 삽입된다. 워터마크가 삽입될 위치의 중요계수는 CPSO를 이용하여 웨이블릿 패킷 변환에 제로트리기법을 적용하여 전대역에 걸쳐 선택한다. 실험결과는 제안된 알고리즘이 비가시적이고 강인함을 보여준다. 특히 고주파 성분이 많이 포함되어 있는 영상을 고압축하는 경우에도 강인함을 보여준다.

Keywords

References

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