A Watermarking Scheme of Lowest Frequency Band Based on the Quad-Tree Algorithm

쿼드트리 알고리즘과 최저주파수대역을 이용한 워터마킹 기법

  • 정병수 (울산대 공대 전기전자공학부) ;
  • 추형석 (울산대 공대 전기전자공학부) ;
  • 신성욱 (울산대 공대 전기전자공학부) ;
  • 안종구 (울산대 공대 전기전자공학부)
  • Published : 2007.11.01

Abstract

In this paper, digital watermarking method using quad-tree algorithm and the lowest frequency band is proposed. The proposed algorithm searches the coefficient of the watermark by using quad-tree algorithm and inserts the watermark by the Cox's algorithm. The simulation of the proposed algorithm is implemented about the effect of various weight factors in Cox's algorithm, that of embedding watermark in each subband coefficient (HH, LH, HL), and that of embedding in the lowest frequency band (LL). As a simulation result, the bigger weight factors in Cox's algorithm show strong to noise. The watermarking performance of simultaneously embedding in HH, LH, and HL band is better than that of different cases. In addition, insertion the watermark to the LL band about $30{\sim}60%$ of all watermarks improves the watermarking performance in comparison with the case of not using the LL band.

Keywords

References

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