A method for identifying the type of color laser printing and copying documents

Abstract

The invention discloses a method for identifying the category of color laser printing and copying documents, which relates to the field of document inspection, and comprises the following steps: S1, performing processing for displaying hidden dots on the color laser printing and copying documents; S2, establishing a grid-shaped coordinate map of dark marking dots ; S3. Statistically obtain the mutation position and repeatability of the small point spacing of the dark mark in the direction of each coordinate axis, and obtain the characteristic contour map of the dark mark; S4. Draw the characteristic contour map of the dark mark, compare it with the characteristic contour map of the dark mark in the database, and obtain the color laser Print the brand information of the copied document. The method for identifying the type of color laser printing and copying documents of the present invention establishes and regularizes the contour map of the dark mark point in a unified manner, realizes the standardized drawing and identification of the mark feature contour map, and then effectively distinguishes the type of the color laser printing copier that the dark mark point belongs to .

Description

technical field [0001] The invention relates to the field of document inspection, in particular to a method for identifying the category of color laser printing and copying documents. Background technique [0002] Hidden feature inspection technology is to use the dark dots in the color laser printing / copier printing / copied documents to trace the brand of the color laser printer and verify the technology of the model. It provides a new method for the inspection of printed documents in criminal investigation and other fields. inspection method. Existing methods generally use physical evidence identification equipment such as document detectors, cameras, or scanners to make printed documents appear small dots, and compare the dot matrix of hidden marks between suspicious documents and known brand and model documents by checking whether the dot matrix array is consistent. The arrangement is consistent to reveal what make or model the file is. [0003] However, in actual work,...

AI Technical Summary

Problems solved by technology

[0006] In view of the defects existing in the prior art, the purpose of the present invention is to provide a method for identifying the type of color laser printing and copying documents, which can solve the problem of inaccurate identification of the boundaries of contour maps in the prior art, and realize rapid and accurate identification of the types of physical evidence

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