Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: On the pinned field image binarization for signature generation in image ownership verification method | Lee and Chang EURASIP Journal on Advances in Signal Processing 2011 2011 44 http content 2011 1 44 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access On the pinned field image binarization for signature generation in image ownership verification method Mn-Ta Lee1 and Hsuan Ting Chang2 Abstract The issue of pinned field image binarization for signature generation in the ownership verification of the protected image is investigated. The pinned field explores the texture information of the protected image and can be employed to enhance the watermark robustness. In the proposed method four optimization schemes are utilized to determine the threshold values for transforming the pinned field into a binary feature image which is then utilized to generate an effective signature image. Experimental results show that the utilization of optimization schemes can significantly improve the signature robustness from the previous method Lee and Chang Opt. Eng. 49 9 097005 2010 . While considering both the watermark retrieval rate and the computation speed the genetic algorithm is strongly recommended. In addition compared with Chang and Lin s scheme J. Syst. Softw. 81 7 1118-1129 2008 the proposed scheme also has better performance. Keywords Ownership verification Image pinned field Optimization Content authentication Genetic algorithm 1. Introduction The advance of computer technology and the popularization of the Internet have resulted in convenient and fast exchange of multimedia contents. How to provide suitable techniques for protecting digital multimedia contents from malicious attacks has become an important and emergent issue. Digital watermarking techniques 1-4 have been massively proposed to protect digital rights. By embedding owner s watermarks such as logos trademarks seals or copyright information into the digital content an owner can claim one s ownership. According to the embedded domain of .
