【摘要】 结合H.264/AVC编解码标准和编解码器的结构,该文提出一种基于I帧压缩域DCT量化系数的视频水印方法。根据DCT量化系数的特点,选择intra4×4模式下DC系数非零的4×4DCT子块作为水印嵌入块,采取区间设定的方式将水印嵌入到低频非零系数中去。在解码端,提取相应位置DCT系数值,利用区间设置关系检测水印,属于盲检测。实验仿真结果表明,该算法具有较小的码率变化和较好鲁棒性。更多还原

【Abstract】 In this paper,combining with the H. 264 /AVC codec standards and codec structures,a video watermark algorithm based on DCT quantization coefficients of the I-frame compression domain is proposed. According to the characteristics of the DCT quantization coefficients,the 4* 4 DCT sub-blocks which have the non-zero DC coefficients and predict through the intra4 * 4 prediction model,are selected as watermarking embedded blocks. At the decoder,the watermark can be extracted by using the relationship between the setting interval and the DCT coefficients in the corresponding position. The simulation results show that proposed method has little the change in bit-rate and better robustness.更多还原