Multi-stage certification method aimed at shaft horse power (shp) line face image layer integrality

The invention discloses a multi-stage certification method aimed at the shaft horse power (shp) line face image layer integrality and belongs to the certification field of geographic information integrity. The method comprises the following two processes: (1) a generating and embedding process for a watermark comprises that parameters can be set to generate a chaotic sequence, vector data can be graded and grouped, the watermark of each grouped data can be generated, and the watermark of each grouped data is embedded; and (2) an extracting and detecting process for the watermark comprises that the parameters can be set to generate a chaotic sequence, the vector data can be graded and grouped, and then, the original watermark information of each grouped data can be extracted to obtain the verification watermark information of each grouped data, the original watermark information is compared with the verification watermark information in each grouped data Hi and grouped data Hj, and based on the comparison result, the integrality grade of the data to be certificated can be provided. By a data grading certification and a certification chain technology, the multi-stage certification method aimed at the shp line face image layer integrality nicely overcomes the shortcomings in the prior art. The shp line face image layer integrality can be in tamper localization and simultaneously, the grades and the degrees of the temper localization can be further ensured.