Printing information hiding and extracting method
A technology for printing information and extracting methods, which is applied in the direction of digital output to printing units, instruments, calculations, etc., can solve the problem that the printed document does not have a good embedded extraction scheme, etc., and achieves the effect of ensuring security and improving efficiency.
Pending Publication Date: 2022-04-05
WUHAN UNIV
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Problems solved by technology
[0003] At present, watermark embedding and extraction methods are generally only aimed at the embedding and extraction of digital documents, and there is no better embedding and extraction scheme for printed documents.
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[0032] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0033] figure 1 It is a method flowchart of a printing information hiding method of the present invention.
[0034] like figure 1 Shown, the method of this embodiment comprises the following steps:
[0035] Step 1: Obtain the code value of the information to be hidden, and convert the information into binary code.
[0036] Step 2: Generate a matrix of hidden information based on binary code information, dot spacing, dot size, and dot style, densely arrange the matrix into the yellow channel of the original to be printed, and print out; wherein generating the hidden information matrix includes the following steps:
[0037] S3: According to the paper size of t...
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The invention provides a printing information hiding method and a printing information extracting method. The printing information hiding method comprises the steps that firstly, information to be encrypted is converted into character codes, the character codes are converted into a binary dot matrix, and dots are printed on a manuscript in the printing stage; the printing information extraction method comprises the following steps: carrying out phase reversal processing on a blue channel of an image obtained by scanning, carrying out connected domain analysis on the image subjected to phase reversal processing, carrying out area filtering, searching a first angular point at the upper left corner to establish a coordinate system, recovering binary information obtained from the coordinate system into character codes, and obtaining extracted information. According to the method, more printing information can be hidden while the visual effect of the original image is not influenced, and the method has higher extraction accuracy.
Description
technical field [0001] The invention relates to the field of hiding and extracting printing information of a printer, in particular to a method for hiding and extracting printing information. Background technique [0002] With the popularization of color printers, people's demand for security control of color printed documents is increasingly strong. For special originals, such as documents containing sensitive information. In addition to authorization verification on the printer, it is also very important to trace the source of relevant information such as the time, place, and printing equipment for printing the original. The demand for traceability information hiding on printed materials is increasingly strong. [0003] At present, watermark embedding and extraction methods are generally only aimed at the embedding and extraction of digital documents, and there is no better embedding and extraction scheme for printed documents. Contents of the invention [0004] In or...
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IPC IPC(8): G06T1/00G06T9/00G06F3/12
Inventor 易尧华霍浩亨涂超虎
Owner WUHAN UNIV