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Decryption and recovery method of document object model (DOM) raster data

A raster data and recovery method technology, applied in the field of geographic information security, can solve problems such as difficult recovery

Inactive Publication Date: 2013-05-08
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The first-order polynomial and affine transformations are linear transformations, which are easy to restore; the spline transformations, second-degree and third-degree polynomial transformations are nonlinear transformations, and the effect is more significant, but it is difficult to restore, so it is necessary to study the effect of the transformation. Decryption and Restoration Method of Difficult-to-Recover Raster Data

Method used

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  • Decryption and recovery method of document object model (DOM) raster data
  • Decryption and recovery method of document object model (DOM) raster data
  • Decryption and recovery method of document object model (DOM) raster data

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Embodiment Construction

[0079] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0080] In this embodiment, raster data in tif format is selected, and operations of reading, deciphering and restoring the data are performed, and the present invention is further described in detail. This embodiment selects a certain raster data (such as image 3 ) as the original raster data, including the following steps:

[0081] (1) Key generation process

[0082] Step 11, determine the data range: obtain the minimum circumscribed rectangle R of the original raster data Raster, the coordinates of the lower left corner of R are (299000, 354000), the coordinates of the upper right corner are (299500.00486, 354500.00486), and the coordinates of the data center point are obtained according to formula (1) (x mid ,y mid ), data length XL and data width YL;

[0083] x mid ...

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Abstract

The invention discloses a decryption and recovery method of document object model (DOM) raster data, and belongs to the field of geography information safety. The decryption and recovery method of the DOM raster data comprises the following steps of (1) a key generation process: confirming a data range, confirming data conversion amount, computing linear and nonlinear transformation parameters; (2) a decryption process: reading a key file, processing each pixel according to the key file, and saving raster data after decryption; and (3) a recovery process: opening the raster data after decryption, and processing each pixel in a circular mode. Aiming at a safety protection problem of the DOM raster data, the decryption and recovery method of the DOM raster data is capable of carrying out decryption to the data according to the key under the premise of ensuring that no change occurs in a data topological relation, and the data after decryption can be recovered according to the key. The decryption and recovery method of the DOM raster data has the advantages of having randomness, gradual change property, reversibility and the like, improving reliability of decryption of the DOM raster data, completing a theory and method system of geographic information safety protection, and being applicable to public release of the DOM raster data, and the like.

Description

technical field [0001] The invention belongs to the field of geographic information security, and in particular relates to a method for decrypting and restoring DOM grid data. Background technique [0002] As a kind of basic geographic data, raster data is directly related to national security and interests. The research on its security protection is very important, and its application should be restricted. Decryption of raster data mainly includes reducing the resolution of raster data and transforming spatial precision. To reduce the resolution of raster data, resampling can be used to change the pixel size. The conversion of spatial precision mainly refers to the use of a certain mathematical model to convert the position of the pixel in space. Grid space coordinate transformation mainly includes polynomial transformation, affine transformation, spline transformation and so on. The first-order polynomial and affine transformations are linear transformations, which are e...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 闫娜周卫
Owner NANJING NORMAL UNIVERSITY
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