TURBO编码在鲁棒数字水印中的实现方法

在典型的通信系统中,调制过程是数字信号加载在载波的幅度值、载波的频率或者载波的相位上。因此,可以把载体数据看成是一种广义上的传输载体,把水印信息看成是一般数字信息,那么水印的嵌入过程就是一个广义的调制过程。相应地,可以把水印的检测过程看成是一个水印信号的解调过程,就是从宿主载体数据中提取水印信号。Turbo码的译码性能在于循环迭代的译码结构,针对Turbo码译码复杂度非常高的缺点,提出了各种低复杂度的译码算法。为了解决在图像中嵌入大容量水印难度大的问题,设计并实现了一种新的基于TURBO编码的鲁棒性数字水印算法。从TURBO码的编码特征入手,实现了嵌入方式的选择、水印基本模型、水印算法具体的程序实现方法。在对鲁棒性数字水印的基本理论进行分析的基础上,有效地改善了TURBO码数字水印技术中鲁棒性能。

TURBO Codes in Robust Digital Watermark Realization Method

In the model communications system, the modulation process also is loaded the digital signal in the carrier scope value, the carrier frequency or on the carrier phase. Therefore, It may regard as the carrier data are one kind of generalized on transmission carrier, regards as the watermark information is the general numerical information, then the watermark inserting process is a generalized modulation process. Corresponding, may regard as the watermark examination process is a watermark signal demodulation process, is withdraws the watermark signal from the host carrier data. The Turbo codes decoding performance lies in the circulation iteration the decoding structure, in view of the Turbo codes decoding order of complexity extremely high shortcoming, proposed each kind of low complexity decoding algorithm. In order to solve in the image inserts the large capacity watermark difficulty major problem, designed and has realized one kind newly based on the TURBO codes robust digital watermark algorithm. Obtained from the TURBO codes code characteristic, realizes has inserted the way the choice, the watermark basic model, the watermark algorithm concrete procedure realization method. In carries on the analysis to the robust digital watermark elementary theory in the foundation, effectively improved in the TURBO codes numeral watermark technology the robust performance.