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
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[0019] In order to describe in detail the technical content, structural features, achieved objectives and achieved effects of the present invention, the following detailed descriptions are combined with specific embodiments.
[0020] The implementation steps of the present invention can be summarized into two parts: watermark information embedding and watermark information extraction. The implementation steps are further elaborated below.
[0021] Step 1: Read the original DEM data to get the elevation value matrix z ( i , j ), 0i ≤ M , 0j ≤ N , M × N Is the total number of grids of DEM. If the original elevation value is a floating point number, in order to facilitate processing, it is expanded to an integer value. After the watermark is embedded, it can be restored to a floating point number.
[0022] Step 2: Spread spectrum processing for the watermark information added to DEM data, the spread spectrum method is the overall repetition increase, forming multiple repetitions of th...
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