关键词: DOM, 不可见数字水印, 多尺度特征, 扩频DWT方法

Abstract:

DOM is one of the fundamental datasets for the surveying and mapping geographic information services. According to the data status in the production unit and the application requirements of the digital watermark for remote sense images, an invisible digital watermark scheme based on the multi-scale characteristics designed for DOM is proposed in this work. Firstly, this scheme extracts multi-scale characteristics using wavelet decomposition and Harris detector. Watermark embedding areas are computed and optimized based on these multi-scale characteristics. Then digital watermarks are imbedded into these areas by using spread-spectrum DWT algorithm. Finally, watermarks are extracted with DOM attribute data as the auxiliary information. The watermarked DOM is evaluated in the aspects of subjective analysis, objective analysis and robustness analysis. Experiments and analysis show that multiple watermarks can be automatically and effectively embedded into DOM by the scheme proposed in this work. The strategies of multiple watermarks and attribute information greatly improve the watermark robustness and the success ratio of watermark detection. This work also proves that the scheme satisfies the invisibility, safety, effectiveness and robustness demand of digital watermark in the practical production.

Key words: DOM, invisible digital watermark, multi-scale characteristics, spread spectrum DWT algorithm