基于AVS音频编码的信息隐藏方法

Information hiding technology using AVS audio coding

提出了一种基于AVS音频编码的信息隐藏方法.该方法基于AVS独特的量化与位平面编码模块,使用位平面嵌入与比例因子修改技术,可以有效降低编码器码率控制对信息隐藏效果的不利影响,而且不使数据载体音质受到破坏.在量化过程中实施信息的嵌入,嵌入过程中主动修改比例因子以降低量化噪声.将隐藏信息进行矢量分组与位平面处理,进而在量化过程中将其嵌入到量化频谱中.仿真结果证明:该方法可以有效降低编码器码率控制对信息隐藏效果的不利影响,且嵌入隐藏信息后AVS音质也无明显损失.

An information hiding method based on the quantization and CBC（context based coding）of AVS（audio video coding standard）audio coding was proposed,in which the technology of bit plane embedment and scale factor adjustment were used to reduce encoder rate control′s negative influence on information hiding and assure the audio quality.The hiding was implemented in the quantization process,and the implementing process used the active scale factor adjustment to reduce quantization noise.First the hiding information was vector grouped and bit plane processed.Then the hiding information was embedded in the quantization spectrum in the quantization process.Experimental results show that this algorithm has great embedding quantity and better robustness,and the audio quality can be assured after the hiding.