Grid DEM (digital elevation model) blind watermark method resistant to elevation translation and clipping attack
A blind watermark and grid technology, applied in the field of cartography and geographic information science, can solve the problems of poor robustness and achieve the effect of advanced methods, good use value and guaranteed accuracy
Active Publication Date: 2015-07-22
LANZHOU JIAOTONG UNIV
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Elevation translation and clipping are common attacking manners specific to DEM data watermark, and the invention provides a grid DEM (digital elevation model) blind watermark method resistant to elevation translation and clipping attack effectively. The method takes account of the characteristics of DEM data, carries out spread spectrum processing to an original watermark, makes the original watermark and an elevation difference value form a mapping relation, utilizes the feature that the elevation difference value of adjacent grids does not change in an elevation translation attack, embeds the bitwise of the watermark subjected to spread spectrum into the elevation difference value in a quantification manner, and apportions the expansive difference value to back single bit of the adjacent elevations. The watermark method has good invisibility, has a relatively small influence on the DEM data accuracy and application accuracy, and has good robustness in resisting the elevation translation and the clipping attack.
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Digital elevation modelInvisibility +4
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