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Engineering drawing copyright protection and modification positioning method

A copyright protection and engineering drawing technology, applied in the field of information security, can solve the problems of low detection efficiency of detection methods

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a copyright protection and modification positioning method for engineering drawings, the purpose of which is to resist global operations and locate local modifications by embedding semi-fragile digital watermarks in engineering drawings, thereby Solve the technical problem of low detection efficiency of the existing engineering drawing version detection method

Method used

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  • Engineering drawing copyright protection and modification positioning method
  • Engineering drawing copyright protection and modification positioning method
  • Engineering drawing copyright protection and modification positioning method

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Embodiment Construction

[0081] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0082] Such as figure 1Shown is a schematic diagram of the principle of watermark embedding in the engineering drawing copyright protection method provided by Embodiment 1; wherein, AB refers to the linear graphic element AB, CD refers to the linear graphic element CD, and V p1 is the virtual point of the line primitive AB, V p2 is the virtual point of the line primitive CD, q is the distance ...

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Abstract

The invention discloses an engineering drawing copyright protection and modification positioning method. The method comprises the following steps: all primitives in the engineering drawing are acquired sequentially; according to types of the primitives, virtual points of a corresponding primitive are acquired; according to a virtual point embedding watermark, the primitive is marked, watermarks are embedded sequentially until all primitives are marked; after the engineering drawing is modified, the water mark embedded in each primitive is extracted sequentially, and a watermark sequence after modification is acquired; in the modified watermark sequence, the original watermark sequence is restored according to the watermark appearing frequencies and a relative position relationship; and the original watermark sequence is compared with the modified watermark sequence, a different position is found out, the modified operation on the engineering drawing is recognized according to watermark features of the position, the operation is finally positioned on the engineering drawing, and modification positioning on the engineering drawing is realized. The method uses vulnerability of the watermarks to carry out detection and positioning on modifications in the engineering drawing, and the robustness of the watermarks is used for protecting the copyright of the engineering drawing.

Description

technical field [0001] The invention belongs to the technical field of information security, and more specifically relates to a copyright protection and modification positioning method for engineering drawings. Background technique [0002] With the popularization of computer applications and the development of Internet collaborative design, the informatization of product design is constantly increasing, and the security of engineering drawings and rapid version detection have been increasingly valued by enterprise users; rapid positioning of engineering drawing revisions helps to improve the version Management efficiency and copyright protection. [0003] The existing version detection method is to extract the graphic elements in the engineering drawing through the ObjectARX secondary development platform, and then compare each graphic element in the original engineering drawing and the target engineering drawing one by one through two-way search; through DC (Divide -and-C...

Claims

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Application Information

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IPC IPC(8): G06T1/00G06F21/16
CPCG06T1/0042G06F21/16
Inventor 陈永府
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