CN102663373A - Paper medium information safety processing method based on long afterglow material - Google Patents

Abstract

The present invention proposes a method for realizing information security of printing paper media by using long-lasting energy storage luminescent materials, including embedding information and identifying information in the printed/printed paper media. The paper medium information security processing method based on the long afterglow material of the present invention includes embedding information in the paper medium, and the specific steps are as follows: select the pattern to be embedded and the embedded hidden information according to the embedding method, encrypt the embedded hidden information, and then convert into binary information; read the original document image, generate a blank image with the same size as the original document in memory, set the size and position of the embedded pattern, and calibrate the embedded document pattern on the generated blank image; read the calibrated image Document image, mark the binary information to be embedded to the specified area of the document image; print the embedded binary information and pattern on the paper medium with colorless fluorescent ink, and then output.

Description

A paper medium information security processing method based on long afterglow materials

technical field

The invention belongs to the field of information processing of anti-counterfeiting and authentication, and relates to a method of using colorless ink containing long-lasting materials to embed hidden patterns or information on printed paper media, and to identify and decode input images by naked eyes or scanning in dark places A processing method to realize the authenticity judgment later.

Background technique

With the advent of high-precision, low-cost copiers, printers, scanners and desktop publishing systems, the anti-counterfeiting of important documents has become a serious problem that has to be faced. In particular, there are similar problems in the counterfeiting of trademarks and outer packaging of some expensive watches, DVDs, high-end tobacco and wine, clothes, medicines, etc.

For anti-counterfeiting of original paper documents, the traditional method is mainly to use watermark method or special ink, laser anti-counterfeiting mark and scratch-off type, uncover type anti-counterfeiting mark to increase the anti-counterfeiting function of the product. The ink is generally a color-changing ink or an ultraviolet fluorescent ink. For example, US Patent No: 8085438 uses ultraviolet fluorescent ink to embed some hidden patterns that are generally invisible on the paper medium, but the pattern can be revealed under the irradiation of a simple ultraviolet light instrument. There are also UV fluorescent materials added into the paper during the papermaking process to form special UV fluorescent anti-counterfeiting paper, such as ZL: 200420044839.7, ZL: 200920025757.0. The UV fluorescent material is turned into UV fluorescent spots by a special preparation method, and then in the papermaking process Add ultraviolet fluorescent dots to pulp to make anti-counterfeiting paper. Or add fluorescent dots to the coating liquid, and use the coating process to coat the surface of the paper. Or the method of spraying ink, spraying on the surface of the paper. The other is color-changing ink, such as US Patent No: 7005166B2, which uses temperature-changing ink to realize anti-counterfeiting function.

The above processing method needs to use paper of special material or ultraviolet anti-counterfeiting ink, so there are problems such as high processing cost and poor popularization. The latest anti-counterfeiting technology is mainly realized by embedding some characteristic information in the paper medium file in a certain way, such as the feature information to be embedded in a certain geometric form such as the shape, position, and size of the pixel point. The difference of each indicates the information code "1" or "0", and the information composed of the pixels is superimposed on the original information, and the characteristic information is hidden in the printed file.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and propose a method that uses ordinary paper to embed a large amount of hidden information or warning anti-counterfeiting patterns that prove the legitimacy of paper media files into the contents of paper media files. The paper media information security processing method can realize the authenticity judgment by identifying and decoding the scanned image. the

The present invention solves its technical problem and realizes by taking the following technical solutions:

A paper medium information security processing method based on long afterglow materials, including embedding information in the paper medium,

Specific steps are as follows:

(1) Select the pattern to be embedded and the embedded hidden information according to the embedding method, encrypt the embedded hidden information, and then convert it into binary information;

(2) Read the original document image and generate a blank image with the same size as the original document in memory. Set the size and position of the embedded pattern, and calibrate the embedded document pattern on the generated blank image;

(3) Read the document image with calibration, and calibrate the binary information to be embedded to the specified area of the document image, that is, if the value of the information to be embedded is "1", print an ink containing fluorescent material there Dot, if the value to be embedded at this time is "0", then this place will be blank, and the ink dot containing fluorescent material will not be printed, and this step will be repeated until all the information is embedded;

(4) Print the binary information and patterns embedded in the specified area on the paper medium with colorless fluorescent ink, and then output.

The steps to identify the original paper media are as follows:

Use a strong light (above 300LUX) to irradiate the original paper medium, and then move it to a dark place to see if there is a luminous pattern; if there is, it is true, otherwise it is regarded as a forgery;

The steps to identify the original by using the hidden information of the paper medium are as follows:

(1) Use strong light (above 300LUX) to irradiate the original paper medium;

(2) In the dark, use a scanning input device (resolution above 600dpi) to capture the image of the original paper medium, store it in the computer, and execute the identification program to identify hidden information;

(3) Image preprocessing, identifying the binary information embedded in the specified area. Information is read from top to bottom and left to right. If it corresponds to a white point, it represents information "1", and a black area represents information "0"; execute this step in a loop until all information is read;

(4) Decrypt the identified binary information, and then decode it into identification information;

(5) Compare the decoded identification information with the embedded hidden information to judge the authenticity of the file.

Embedded hidden information includes one or more of file content, trace information, encrypted information, and steganographic information.

It also includes tracking information; the tracking information includes printing time, printer, and printer model.

The long-lasting luminescent material used in the present invention can be one or a specific combination of yellow-green, red, cyan, and blue-violet light; green, blue.

The embedded pattern is a single color pattern or a mixed color pattern.

The pattern is a larger special pattern or a tiny coded dot matrix pattern, or a combination of both. The coding dot matrix pattern is an existing one-dimensional, two-dimensional barcode form or a self-made coding form. The coded dot matrix has a dot representing the binary information "1", and the blank space is the information "0".

The present invention prints/prints some special patterns or coded dot matrix with a certain structure formed by conversion of hidden information on the paper medium with colorless ink containing long afterglow luminescent material. Under normal circumstances, these patterns and dot matrix codes are invisible, unless the paper is placed in a dark room after being irradiated with strong light. At this time, the long afterglow material will automatically glow, and the hidden dot matrix information or special patterns will appear. Information identification methods are divided into two types. Simple and large special patterns can be identified with the naked eye; complex dot matrix coding containing hidden information requires scanning of paper media files, image processing, decoding hidden information and judging its authenticity.

The advantages and effects of the present invention are:

1. The present invention embeds anti-counterfeiting information and special pattern information that can prove the legitimacy of the paper medium document into the paper medium, which can well prevent the original from being tampered with and forged.

2. The present invention can flexibly set the embedded information content, pattern form and embedded position, and the authenticity detection method is simple and easy to use. The authenticity can be distinguished only by decoding with naked eyes or image input equipment and decoding software.

3. The present invention can realize the anti-counterfeiting of the original and copy of the paper medium by using ordinary paper, avoiding the use of special ultraviolet detection instruments, thus greatly saving the cost and reducing the use cost.

4. The printed original of paper media with embedded anti-counterfeiting information does not contain hidden information printed with long-lasting fluorescent ink in the copied copy, so the original and the copy can be clearly distinguished.

5. The present invention effectively solves the problem of tampering and forgery of paper media copies, so that the authenticity of paper media copies is guaranteed, and paper media copies can be more widely used.

Description of drawings

Fig. 1 is a flowchart of a method for securely processing information on paper media;

Figure 2 is an example diagram of information embedding in paper media;

Figure 3 is a certificate pattern with embedded information and special patterns;

Figure 4 is the effect diagram of the certificate placed in the dark after being irradiated by light;

Figure 5 is an effect diagram of the test results of the copy of the certificate in the dark;

Figure 6 is a flow chart of hidden information identification .

Detailed ways

The embodiments of the present invention will be further described below in conjunction with the accompanying drawings, but the embodiments of the present invention are illustrative rather than limiting.

Fig. 1 is a flowchart of a method for securely processing information on paper media;

S1 reads the original document image, stores it in the computer memory, and then transfers to S2

S2 Select the embedded pattern form, set the embedded area, and then go to S3

S3 Mark the embedded pattern on the original document image, prepare for printing, go to S4

S4 Read the embedded hidden information, set the embedded information position, go to S5

S5 encrypts and converts the read information into binary, stores the data in memory, and transfers to S6

S6 performs virtual grid division in the specified area, and performs hidden information calibration in the order from left to right and from top to bottom. If the embedded binary information is "1", calibrate a dot at the grid, if the embedded binary information is 0, do not calibrate. After all the information is calibrated, go to S7

S7 uses fluorescent ink to print marked special patterns and hidden information on the original document.

S8 Result output, complete the certificate processing with anti-counterfeiting and anti-copy functions.

Fig. 2 is a sample diagram of embedding hidden information in this embodiment. After the hidden information embedding position is selected, the embedding area is automatically divided into grid units of a certain size according to the set parameters. When the embedded binary information is "1", a colorless fluorescent ink is used to print a dot on the grid; if the embedded information is "0", no fluorescent dot is printed. 201 represents information "0", and 202 represents information "1". Both the grid area and the spacing between adjacent grids can be adjusted according to the amount of embedded hidden information.

Fig. 3 is an example of a certificate with anti-counterfeiting function generated by this embodiment. Under normal circumstances, hidden information and patterns cannot be seen.

Figure 4 is an effect diagram of the special pattern embedded with long-lasting colorless ink and the self-illumination of the embedded hidden information dots in the dark after the certificate is illuminated by strong light. After capturing the image, use the recognition software to read and decode the hidden information, and compare the recognition results to determine the authenticity of the certificate.

401 is the embedded binary hidden information point "1", and 402 is the embedded special pattern, which can be the logo of each unit, the trademark of the brand, etc.

Figure 5 is the effect diagram of the detection after the original is copied by the copier. Since the copy does not contain the pattern and hidden information printed by long-lasting fluorescent ink, the luminous pattern and hidden information points cannot be detected in the dark. In this way, it can be judged whether the document is a copy or a counterfeit, and it can prevent copying and tampering. the

Fig. 6 is the hidden information identification process of the present invention, which is divided into the following steps:

(1) Use strong light (above 300LUX) to irradiate the original paper medium.

(2) Use a scanning input device (resolution above 600dpi) to capture the image of the original paper medium in the dark and store it in the computer.

(3) Image localization, and then identify the binary information embedded in the designated area. Information is read from top to bottom and left to right. If it corresponds to a white point, it represents information "1", and a black area represents information "0"; execute this step in a loop until all information is read;

(4) Decrypt the identified binary information, and then decode it into identification information;

(5) Compare the decoded identification information with the embedded hidden information to judge the authenticity of the file.

Claims (10)

1. the paper medium information security processing based on long-afterglow material is included in embedding information in the paper medium,

Concrete steps are following:

(1) hiding Info of pattern that selection will embed according to embedded mode and embedding, the encryption that hides Info with embedding is converted into binary information then;

(2) read former document image, in internal memory, generate the size blank image the same, set and embed pattern magnitude and position, the document pattern that embeds is demarcated on the blank image that generates with former document;

(3) read the file and picture that has demarcation, the binary message that will embed is demarcated the appointed area of file and picture;

(4) on the paper medium, print binary message and the pattern that designation area is carried embedding with colorless fluorescent printing ink, then output.

2. paper medium information security processing according to claim 1 is characterized in that: comprise that also the paper medium original identification step is following:

Use than the strong illumination paper medium original, move on to the dark place then and check whether have luminous pattern to manifest; Having, then is true, otherwise be regarded as forging.

3. paper medium information security processing according to claim 1 is characterized in that: comprise that also to utilize hiding Info of paper medium to carry out the original paper identification step following:

(1) uses than the strong illumination paper medium original;

(2) in the dark with the image of scan input device picked-up paper medium original, deposit in the computing machine, carry out the recognizer identification that hides Info;

(3) image pre-service, the binary message that the identification appointed area embeds;

According to from top to bottom, the breath of winning the confidence of sequential read from left to right;

If corresponding white point, representative information " 1 ", black region, representative information " 0 "; This step is carried out in circulation, until reading all information;

(4) binary message of identification is deciphered, be decoded into identifying information then;

(5) identifying information of decoding and the hiding breath of embedding are compared, judge the authenticity of file.

4. paper medium information security processing according to claim 1 is characterized in that: the hiding Info of embedding comprises one or more in file content, trace information, enciphered message, the secret writing information.

5. paper medium information security processing according to claim 1 is characterized in that: also comprise trace information during printing; Described trace information comprises time-write interval, printing person, printer model.

6. paper medium information security processing according to claim 1 is characterized in that: long after glow luminous material is one or several particular combination of jaundice green, redness, cyan, blue-violet light; Green, blue.

7. according to claim 1,2 or 3 described paper medium information security processings, it is characterized in that: the pattern of described embedding is the pattern of a certain monochrome, or the mixed colors pattern.

8. paper medium information security processing according to claim 1 is characterized in that: said pattern is special pattern or encoded point system of battle formations case, or the two combination.

9. paper medium information security processing according to claim 8 is characterized in that: described encoded point system of battle formations case is that one dimension, two-dimensional bar code form are perhaps from the coding form of formulating.

10. paper medium information security processing according to claim 9 is characterized in that: described coding dot matrix, represent binary message a little " 1 ", blank space is information " 0 ".

Images