摘要
多进制编码和混合进制编码广泛应用于信息隐藏领域,影响其编码性能的一个关键因素是进制转换效率.针对任意k进制序列到p进制序列的相互转换,提出一种高效的进制转换算法,并根据信息论证明了其最优性.利用新算法改进了KT-Lex文本隐写系统、网页等价标记隐写术、图着色编码和APPM编码等多种基于混合进制编码和分组多进制编码的隐写术,有效提高了原方法的隐写性能.理论分析和实验结果均表明了该算法的有效性.
Abstract： Muti-ary codes and mix-ary codes are widely used in information hiding, while the transfer effi- ciency between notational systems is an important factor of coding efficiency. An effective notational system transfer algorithm based on double-coding method is proposed for transforming arbitrary k-ary sequences to p-ary sequences. It is proved that the proposed notational system transform algorithm is optimal. The method is applied to improve embedding efficiency of several kinds of steganographic algorithms based on mix-ary codes or grouped multi-ary codes, including KT-Lex steganographic system, webpage steganography based on equal tag, grid coloring codes and APPM codes. Both theory analysis and experimental results show that the proposed method is effective.
出处
《应用科学学报》
CAS
CSCD
北大核心
2013年第6期569-578,共10页
Journal of Applied Sciences
基金
国家自然科学基金(No.60803155
No.60970141
No.60902102
No.61274133)
中国科学院战略性先导专项课题基金(No.XDA06030601)
国家重大科技专项基金(No.2 010ZX03004-003)
郑州市科技创新团队项目基金(No.10CXTD150)资助
关键词
信息隐藏
隐写术
隐写编码
转换效率
嵌入效率
嵌入容量
information hiding, steganography, steganographic coding, transform efficiency, embedding effi-ciency, embedding capacity
