一种颜色分量选取方案在彩色图像数字水印中的应用

THE APPLICATION OF A COLOUR COMPONENT SELECTION SCHEME IN COLOUR-IMAGE DIGITAL WATERMARKING

针对彩色印刷制品的版权保护问题,在独立于设备的LAB颜色空间中,提出一种颜色分量选取方案来进行数字水印的操作。首先对各颜色分量进行DCT变换,然后利用图像的掩蔽特性,动态地选择适当的颜色分量来嵌入和提取水印。实验结果表明,在此种方案选取的颜色分量当中嵌入水印具有更好的不可见性,且更易于对水印进行检测,对常见的攻击也具有较好的鲁棒性。因此,该方案是彩色图像数字水印领域中一种行之有效的颜色分量选取方案。

With regard to the problem of copyright protection in colour printing, in this paper it proposes a colour component selection scheme to handle the digital watermarking operation in the LAB colour space which is independent of the device. Firstly,it carries out the DCT transform in each colour component, and then chooses dynamically the appropriate colour component to embed and extract the watermark with the use of the masking characteristic in images. The experimental results show that the proposed scheme has better effect in invisibility for the watermark to be embedded into the selected colour component, and is easier to detect the watermark and has better robust for various attacks. Therefore, this scheme is an effective scheme of colour component selection in colour-image digital watermarking field.