Research on Image Encryption Technology of Geographic Surveying and Mapping Based on Hierarchical Transformation
In order to improve the security and stability of geo-mapping information management,based on the hierarchical transformation algorithm,a kind of encryption technology of geo-mapping image was studied.According to the distribution of the pixel density of the image,we divide the geographic mapping image into layers,use the image scrambling technology,transform and encrypt the mapping image,and then decode and calculate the layer transformation image,finish the research on image encryption technology of geographic mapping.In order to test the encryption effect of this method,a simulation experiment is designed.The results show that the total operation time of encryption and de-cryption is 88MS,92MS and 97ms respectively for different-size surveying and mapping images,which is real-time and efficient,for 500 ran-dom mapping images,the average change rate of pixels is 99.74%,and the average change intensity of pixels is 33.83%,has the security and the validity.
hierarchical transformationimage scrambling technologygeographic mapping imageimage encryption technologypixel gray value
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