Earticle

초록

영어

As digital halftone images are widely used in the printing of books, magazines, newspapers and computer printers, the ease with which perfect copies can be made, may lead to large-scale unauthorized copying.
Watermarking has been considered for many copy prevention and copyright protection applications. The hybrid watermarking system is proposed for halftone images that the watermarks embedded based on the spatial domain and frequency domain separately to enhance the robustness. For the purpose of copyright protection, the watermarks are embedded into the halftone image with visual transparency and robustness by the variety of dispersed dot order dither arrays generated by the particle swarm optimization (PSO) method achieving good robustness and image quality produce patterns for the spatial watermarks embedding system. After the binary pseudo-wavelet transform (BPWT), the second watermarks are embedded into the high-frequency components of the BPWT coefficients of the spatial domain based watermarked image that the frequency domain based watermarking is independent to the spatial domain based one. And the modified quality criterion system for halftone images is proposed by using the PSO based visual filter. The experimental results show that the hybrid watermarking algorithm is more robust for halftone images and the watermarked halftone image possesses high image quality by the PSO algorithm.

목차

Abstract
 1. Introduction
 2. Halftoning Using Dithering
 3. Binary Pseudo-wavelets Transform
 4. Proposed Watermarking Methods
  4.1 Watermark Embedding
  4.2 Watermark Extracting
  4.3 Quality Criterion by PSO
 5. Simulations
 6. Conclusions
 References

키워드

저자

• Ching-Tang Hsieh [ Dep. of Electrical Engineering, Tamkang University, Taiwan ]
• Yeh-Kuang Wu [ Dep. of Electrical Engineering, Tamkang University, Taiwan ]
• Kuo-Ming Hung [ Dep. of Information Management, Kainan University, Taiwan ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  International Journal of Advanced Science and Technology

• 간기

  월간

• pISSN

  2005-4238

• 수록기간

  2008~2016

• 십진분류

  KDC 505 DDC 605