基于直接序列扩频码的图像空间域水印技术

Spatial Domain Image Watermarking Technology Based on Direct Sequence Spread Spectrum Codes

提出了一种基于直接序列扩频码的图像空间域水印方案.在建立数字图像水印的通信模型的基础上,通过生成原图的视觉掩模以充分保证图像的逼真度,在数字图像相应的空间域嵌入扩频码调制水印,同时利用纠错编码技术来进一步增强水印的抗干扰性能.水印的检测通过计算像差图像和原扩频码的相关性来实现.实验表明,该方案提高了数字水印的稳健性和隐蔽性,具有较好的主观效果.

A kind of spatial domain image watermarking scheme based on direct sequence spread spectrum (DSSS) codes is proposed. On the basis of establishing the communication model of digital image watermarking, the authors generate a visual mask from the cover image to keep the fidelity of the image, and then embed the spread spectrum modulated watermark into the corresponding spatial domain of the digital image. At the same time, the error correction coding technique is used to improve the anti-jamming capability of the watermark. The detection is realized by computing the correlation between the difference image and the original spread spectrum codes. Experimental results show that the scheme improves the robustness and invisibility of the image watermark, while has preferable subjective effects.