CN117156062A - Information hiding and displaying method based on halftone image - Google Patents
Information hiding and displaying method based on halftone image Download PDFInfo
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- CN117156062A CN117156062A CN202311147916.5A CN202311147916A CN117156062A CN 117156062 A CN117156062 A CN 117156062A CN 202311147916 A CN202311147916 A CN 202311147916A CN 117156062 A CN117156062 A CN 117156062A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
- H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
- H04N1/32149—Methods relating to embedding, encoding, decoding, detection or retrieval operations
- H04N1/32203—Spatial or amplitude domain methods
- H04N1/32256—Spatial or amplitude domain methods in halftone data
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T1/00—General purpose image data processing
- G06T1/0021—Image watermarking
- G06T1/005—Robust watermarking, e.g. average attack or collusion attack resistant
- G06T1/0071—Robust watermarking, e.g. average attack or collusion attack resistant using multiple or alternating watermarks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/23—Reproducing arrangements
- H04N1/2307—Circuits or arrangements for the control thereof, e.g. using a programmed control device, according to a measured quantity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
- H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
- H04N1/32149—Methods relating to embedding, encoding, decoding, detection or retrieval operations
- H04N1/32267—Methods relating to embedding, encoding, decoding, detection or retrieval operations combined with processing of the image
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
- H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
- H04N1/32149—Methods relating to embedding, encoding, decoding, detection or retrieval operations
- H04N1/32288—Multiple embedding, e.g. cocktail embedding, or redundant embedding, e.g. repeating the additional information at a plurality of locations in the image
- H04N1/32304—Embedding different sets of additional information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
- H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
- H04N1/32149—Methods relating to embedding, encoding, decoding, detection or retrieval operations
- H04N1/32309—Methods relating to embedding, encoding, decoding, detection or retrieval operations in colour image data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
- H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
- H04N1/32149—Methods relating to embedding, encoding, decoding, detection or retrieval operations
- H04N1/3232—Robust embedding or watermarking
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
- H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
- H04N1/32149—Methods relating to embedding, encoding, decoding, detection or retrieval operations
- H04N1/32347—Reversible embedding, i.e. lossless, invertible, erasable, removable or distorsion-free embedding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
The invention discloses an information hiding and displaying method based on a halftone image, which comprises the following steps: 1. newly creating an original carrier image with a CMYK color mode, and carrying out color separation processing on the original carrier image to obtain four single color plates; 2. cutting a single color plate into at least two bearing layer sub-color plates, performing image halftoning on the bearing layer sub-color plates, and setting different screening angles to create an information hiding space bearing position; 3. embedding the hidden information into the sub-color version of the bearing layer; 4. fusing the sub-color plates of the bearing layer embedded with a plurality of hidden information, combining four single color plates, and embedding the plurality of hidden information into an original carrier image to obtain a halftone image embedded with the plurality of hidden information; 5. manufacturing an electronic revealing layer grating tool; 6. different grating angles are adjusted, hidden information is displayed, and the containing amount of the hidden information in the image and the efficiency and experience sense of verifying the authenticity of the product by a user are improved.
Description
Technical Field
The invention belongs to the technical field of computer image anti-counterfeiting, and particularly relates to an information hiding and displaying method based on a halftone image.
Background
Along with the high-speed development of social economy and science and technology level, the digital image pre-press encryption technology has the advantages of no need of increasing enterprise cost and high information autonomy degree, combines the advantages of intelligent display of a mobile terminal, is focused by researchers in various countries around the world in the past decades, and the currently mainstream image encryption technology mainly focuses on two aspects of digital watermarking algorithm and halftone image processing, and is based on the image processing technology of Morse principle.
In recent years, with the rapid development of internet and computer technology, new support is provided for printing anti-counterfeiting technology, more and more printing enterprises apply computer image processing technology to the image manufacturing process before printing of the printed matter, and a printed matter half-tone anti-counterfeiting technology is formed.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide an information hiding and displaying method based on a halftone image, which improves the containing amount of hidden information in the image and the efficiency and experience sense of verifying the authenticity of a product by a user.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
an information hiding and displaying method based on a halftone image includes the steps of:
step 1, creating an original carrier image with a CMYK color mode, and carrying out color separation treatment on the original carrier image to obtain C, M, Y and K four single color plates;
step 2, cutting a single color plate into at least two bearing layer sub-color plates, performing image halftoning on the bearing layer sub-color plates, and setting different screening angles to create information hiding space bearing positions which are not interfered with each other;
step 3, respectively embedding different hidden information into different bearing layer sub-color plates, and carrying out micro-modulation structure change processing on the dot information in the bearing layer sub-color plates to obtain the bearing layer sub-color plates embedded with a plurality of hidden information;
step 4, fusing the sub-color plates of the bearing layer embedded with a plurality of hidden information to obtain single color plates C, M, Y and K respectively containing more than two hidden information, combining the four single color plates to enable the plurality of hidden information to be embedded into an original carrier image, and obtaining a halftone image embedded with the plurality of hidden information;
step 5, manufacturing an electronic revealing layer grating tool according to the halftone image embedded with the plurality of hidden information;
and 6, superposing the electronic revealing layer grating tool on the halftone image embedded with the plurality of hidden information, adjusting different grating angles, and reading the different hidden information one by one so as to realize the display of the hidden information.
Further, the specific process of the step 1 is as follows: newly building a file with 800-2400 dpi output resolution and CMYK color mode in Photoshop, and importing a selected color image into the file to obtain an original carrier image.
Further, the size of the file is (1 to 10) cm× (1 to 10) cm.
Further, the specific process of the step 2 is as follows:
step 2.1, replacing C, M, Y and K gray scales of four single color plates in matlab, and cutting the single color plate into at least two bearing layer sub-color plates according to formulas (1) and (2), wherein a dot density value B of the bearing layer sub-color plates is expressed as a formula (3):
P ε ＝P1 ε +P2 ε +P3 ε +... (1)
P1 ε ＝P ε *γ\100 (2)
B＝1-(A*γ) (3)
in the formulas (1) - (3), P represents a single color plate C, M, Y or K, epsilon is the gray value of the corresponding single color plate, P1 is a bearing layer sub-color plate 1, P2 is a bearing layer sub-color plate 2, P3 is a bearing layer sub-color plate 3, gamma is a cutting coefficient, the value is 0-100, and A is the dot density value of the primary color plate C, M, Y or K;
and 2.2, carrying out halftone screening treatment on each bearing layer sub-color plate in a bitmap mode, generating the bearing layer sub-color plates into halftone images, wherein any dot shape is adopted in the screening process, the number of screening lines is 100-200lpi, the screening angle is larger than 15 degrees, and the screening angles of each bearing layer sub-color plate are different, so that information hiding space bearing positions which are not mutually interfered are created.
Further, the step 3 is to select the position of the bearing layer sub-color plate dot density value at 15% -30% to embed hidden information.
Further, the step 3 of performing micro-modulation structure change processing on the dot information in the sub-color plate of the bearing layer refers to performing frame extraction on the hidden information in Matlab and removing an invalid portion, and the dot position of the hidden information after micro-modulation is expressed as:
in the formulas (4) and (5), pa and Pb are the horizontal and vertical resolutions of the sub-color plates of the bearing layer, alpha is the screening angle of the sub-color plates of the bearing layer, and Ps is the dot area rate of the information hiding position of the sub-color plates of the bearing layer.
Further, the process of manufacturing the electronic disclosure layer grating tool in the step 5 is as follows: setting the upper left corner (0, 0) point of the original carrier image as a starting point, setting the grating angle to be the same as the screening angle of the corresponding bearing layer sub-color plate,creating an electronic revealing layer grating tool, dot coordinates (X i ,Y j ) Calculated from formulas (6) to (8):
X i ＝(i-1)T·(j-1) (6)
wherein W is the area ratio of the electronic revealing layer grating tool grating, T is the net line number of the halftone image, and Ps is the dot area ratio of the sub-color version information hiding position of the bearing layer;i is a row label, j is a column label, []And representing rounding, wherein M is the number of horizontal pixels of the mobile phone screen, and N is the number of vertical pixels of the electronic hidden tool.
Compared with the prior art, the invention has the following technical effects:
the invention aims at the display effect of image fusion multiple watermarks based on the setting characteristics of the printed image structure, halftone image dot structure modulation and digital watermark dot matrix information characteristics, explores an anti-counterfeiting method for multiple hiding and displaying of raster structure images and halftone printed image watermark information, solves the problem of insufficient information capacity in the prior images by using a color plate cutting technology, improves the containing amount of hidden information in the images, constructs an anti-counterfeiting technical system for hiding and displaying the printed image multiple watermark information with different structures, realizes intelligent display of hidden information, improves the efficiency and experience of verifying the authenticity of products by consumers, ensures that the anti-counterfeiting verification of printed matters is more direct and more efficient, improves the printing and packaging performance of the products, and promotes the sales of commodities.
Drawings
Fig. 1: the information hiding and displaying flow chart of the invention;
fig. 2: the information to be hidden in the invention;
fig. 3: the bearing layer sub-color plate embedded with hidden information is provided by the invention;
fig. 4: the halftone image embedded with a plurality of hidden information of the present invention;
fig. 5: the invention discloses an electronic revealing layer grating tool schematic diagram;
fig. 6: the invention reads and displays different hidden information process schematic diagrams.
Detailed Description
The following examples illustrate the invention in further detail.
As shown in fig. 1, a method for hiding and displaying information based on halftone image includes the following steps:
step 1, newly creating a file with the output resolution of 800-2400 dpi, the color mode of CMYK and the size of (1-10) cm x (1-10) cm in Photoshop, importing a color image into the file to obtain an original carrier image, and carrying out color separation treatment on the original carrier image to obtain C, M, Y and K four single color plates;
step 2, cutting a single color plate into at least two bearing layer sub-color plates, performing image halftoning on the bearing layer sub-color plates, and setting different screening angles to create information hiding space bearing positions which are not interfered with each other, wherein the specific process is as follows:
step 2.1, replacing C, M, Y and K gray scales of four single color plates in matlab, and cutting the single color plate into at least two bearing layer sub-color plates according to formulas (1) and (2), wherein a dot density value B of the bearing layer sub-color plates is expressed as a formula (3):
P ε ＝P1 ε +P2 ε +P3 ε +... (1)
P1 ε ＝P ε *γ\100 (2)
B＝1-(A*γ) (3)
in the formulas (1) - (3), P represents a single color plate C, M, Y or K, epsilon is a gray value of a corresponding single color plate, P1 is a bearing layer sub-color plate 1, P2 is a bearing layer sub-color plate 2, P3 is a bearing layer sub-color plate 3, when the number of cut parts is less than 3, the bearing layer sub-color plate has good performance of bearing hidden information, gamma is a cutting coefficient, the value is 0-100, and A is a dot density value of a primary color plate C, M, Y or K;
step 2.2, carrying out halftone screening treatment on each bearing layer sub-color plate in a bitmap mode, generating the bearing layer sub-color plates into halftone images, wherein any dot shape is adopted in the screening process, the number of screening lines is 100-200lpi, the screening angle is larger than 15 degrees, and the screening angles of each bearing layer sub-color plate are different, so that information hiding space bearing positions which are not mutually interfered are created;
step 3, selecting the position of the dot density value of the sub-color plate of the bearing layer to embed hidden information at 15% -30%, embedding different hidden information into different sub-color plates of the bearing layer respectively through multiple operations, extracting frames of the hidden information in Matlab, and removing invalid parts, so as to perform micro-modulation structure change processing on the dot information in the sub-color plate of the bearing layer, and obtaining the sub-color plate of the bearing layer embedded with a plurality of hidden information, wherein the dot positions of the hidden information after micro-modulation are expressed as follows:
in formulas (4) and (5), pa and Pb are the horizontal and vertical resolutions of the sub-color plates of the bearing layer, alpha is the screening angle of the sub-color plates of the bearing layer, ps is the dot area rate of the hidden position of the sub-color plates of the bearing layer, and x and y represent the abscissa and ordinate of the dot position respectively;
step 4, fusing the sub-color plates of the bearing layer embedded with a plurality of hidden information, recovering the original color richness of the single color plate C, M, Y and the original color richness of K, enabling the single color plate to contain more than two hidden information, combining the single color plate containing more than two hidden information, enabling the plurality of hidden information to be embedded into an original carrier image, recovering the richness of the original carrier image, and obtaining a halftone image embedded with the plurality of hidden information;
step 5, manufacturing an electronic revealing layer grating tool according to the halftone image embedded with a plurality of hidden information, wherein the specific process is as follows: setting the upper left corner (0, 0) point of the original carrier image as a starting point, wherein the grating angle is the same as the screening angle of the corresponding bearing layer sub-color plate, creating an electronic revealing layer grating tool, and the dot coordinates (X i ,Y j ) Calculated from formulas (6) to (8):
X i ＝(i-1)T·(j-1) (6)
wherein W is the area ratio of the electronic revealing layer grating tool grating, T is the net line number of the halftone image, and Ps is the dot area ratio of the sub-color version information hiding position of the bearing layer;i is a row label, j is a column label, []The representative rounding, M is the number of horizontal pixels of the mobile phone screen, and N is the number of vertical pixels of the electronic hidden tool;
and 6, superposing the electronic revealing layer grating tool on the halftone image embedded with the plurality of hidden information, adjusting different grating angles, and reading hidden information embedded into the original carrier image from different angles, thereby realizing the display of the hidden information.
Application example
And taking Photoshop and Matlab as implementation tools, and carrying out a revealing process on the color halftone multiple hidden information images. The method comprises the following steps:
step 1: newly building a file with the size of 6cm multiplied by 6cm, the output resolution of 1050dpi and the color mode of CMYK in Photoshop, importing a color image into the file to obtain an original carrier image, exporting the original carrier image, storing the original carrier image in Matlab, and separating color plates to obtain C, M, Y and K four single color plates;
step 2, dividing and storing the color plates of the single color plate C, M, Y and K, setting the screening line number to 175lpi in Photoshop, setting the screen dot shape to be circular, and setting different screening angles for each bearing layer sub-color plate;
step 3, selecting a watermark with the size of 2cm multiplied by 3.5cm as hidden information of a single bearing layer sub-color plate in fig. 2, converting the watermark into a gray mode, extracting the boundary of the hidden information in Mtalb, removing a non-boundary part, and performing micro modulation transformation on dot information in the boundary of the hidden information to obtain the bearing layer sub-color plate embedded with the hidden information as shown in fig. 3;
step 4, repeating the step 3, embedding watermarks in different positions in the image 2 into a plurality of bearing layer sub-color plates, fusing the bearing layer sub-color plates embedded with the hidden information, merging single color plates containing more than two hidden information, and embedding the plurality of hidden information into an original carrier image to obtain a halftone image embedded with the plurality of hidden information as shown in the image 4;
step 5, setting the point of the upper left corner (0, 0) of the original carrier image as a starting point, taking a screening angle of 45 degrees as a grating angle, and creating an electronic revealing layer grating tool shown in fig. 5;
and 6, as shown in fig. 6, superposing the electronic revealing layer grating tool generated in the step 5 on the halftone image embedded with the plurality of hidden information through a terminal platform, and reading and displaying different hidden information through adjusting different grating angles.
Claims (7)
1. An information hiding and displaying method based on a halftone image is characterized by comprising the following steps:
step 1, creating an original carrier image with a CMYK color mode, and carrying out color separation treatment on the original carrier image to obtain C, M, Y and K four single color plates;
step 2, cutting a single color plate into at least two bearing layer sub-color plates, performing image halftoning on the bearing layer sub-color plates, and setting different screening angles to create information hiding space bearing positions which are not interfered with each other;
step 3, respectively embedding different hidden information into different bearing layer sub-color plates, and carrying out micro-modulation structure change processing on the dot information in the bearing layer sub-color plates to obtain the bearing layer sub-color plates embedded with a plurality of hidden information;
step 4, fusing the sub-color plates of the bearing layer embedded with a plurality of hidden information to obtain single color plates C, M, Y and K respectively containing more than two hidden information, combining the four single color plates to enable the plurality of hidden information to be embedded into an original carrier image, and obtaining a halftone image embedded with the plurality of hidden information;
step 5, manufacturing an electronic revealing layer grating tool according to the halftone image embedded with the plurality of hidden information;
and 6, superposing the electronic revealing layer grating tool on the halftone image embedded with the plurality of hidden information, adjusting different grating angles, and reading the different hidden information one by one so as to realize the display of the hidden information.
2. The method for hiding and displaying information based on halftone image according to claim 1, wherein the specific process of step 1 is: newly building a file with 800-2400 dpi output resolution and CMYK color mode in Photoshop, and importing a selected color image into the file to obtain an original carrier image.
3. The information hiding and displaying method based on halftone image according to claim 2, wherein the size of the file is (1-10) cm× (1-10) cm.
4. The information hiding and displaying method based on halftone image according to claim 1, wherein the specific process of step 2 is:
step 2.1, replacing C, M, Y and K gray scales of four single color plates in matlab, and cutting the single color plate into at least two bearing layer sub-color plates according to formulas (1) and (2), wherein a dot density value B of the bearing layer sub-color plates is expressed as a formula (3):
P ε ＝P1 ε +P2 ε +P3 ε +... (1)
P1 ε ＝ P ε *γ\100 (2)
B＝1- ( A*γ) (3)
in the formulas (1) - (3), P represents a single color plate C, M, Y or K, epsilon is the gray value of the corresponding single color plate, P1 is a bearing layer sub-color plate 1, P2 is a bearing layer sub-color plate 2, P3 is a bearing layer sub-color plate 3, gamma is a cutting coefficient, the value is 0-100, and A is the dot density value of the primary color plate C, M, Y or K;
and 2.2, carrying out halftone screening treatment on each bearing layer sub-color plate in a bitmap mode, generating the bearing layer sub-color plates into halftone images, wherein any dot shape is adopted in the screening process, the number of screening lines is 100-200lpi, the screening angle is larger than 15 degrees, and the screening angles of each bearing layer sub-color plate are different, so that information hiding space bearing positions which are not mutually interfered are created.
5. The method for hiding and displaying information based on halftone image according to claim 1, wherein said step 3 selects a position of 15% -30% of the carrier layer sub-halftone dot density value to embed hidden information.
6. The method for hiding and displaying information based on halftone image according to claim 1, wherein the step 3 of performing micro-modulation structure change processing on the dot information in the sub-color plate of the carrier layer means that frame extraction is performed on the hidden information in Matlab and invalid portions are removed, and the dot positions of the hidden information after micro-modulation are expressed as:
in the formulas (4) and (5), pa and Pb are the horizontal and vertical resolutions of the sub-color plates of the bearing layer, alpha is the screening angle of the sub-color plates of the bearing layer, and Ps is the dot area rate of the information hiding position of the sub-color plates of the bearing layer.
7. The method for hiding information and displaying information based on halftone image according to claim 1, wherein said step 5 of fabricating an electronic revealing layer grating tool comprises: setting the upper left corner (0, 0) point of the original carrier image as a starting point, wherein the grating angle is the same as the screening angle of the corresponding bearing layer sub-color plate, creating an electronic revealing layer grating tool, and the dot coordinates (X i ,Y j ) Calculated from formulas (6) to (8):
X i ＝(i-1)T·(j-1) (6)
wherein W is the area ratio of the electronic revealing layer grating tool grating, T is the net line number of the halftone image, and Ps is the dot area ratio of the sub-color version information hiding position of the bearing layer;i is a row label, j is a column label, []And representing rounding, wherein M is the number of horizontal pixels of the mobile phone screen, and N is the number of vertical pixels of the electronic hidden tool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311147916.5A CN117156062A (en) | 2023-09-06 | 2023-09-06 | Information hiding and displaying method based on halftone image |
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| CN202311147916.5A CN117156062A (en) | 2023-09-06 | 2023-09-06 | Information hiding and displaying method based on halftone image |
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| CN117156062A true CN117156062A (en) | 2023-12-01 |
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| CN202311147916.5A Pending CN117156062A (en) | 2023-09-06 | 2023-09-06 | Information hiding and displaying method based on halftone image |
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