CN110086956B - Display and hiding method for halftone hidden image floating effect - Google Patents

Display and hiding method for halftone hidden image floating effect Download PDF

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CN110086956B
CN110086956B CN201910424352.2A CN201910424352A CN110086956B CN 110086956 B CN110086956 B CN 110086956B CN 201910424352 A CN201910424352 A CN 201910424352A CN 110086956 B CN110086956 B CN 110086956B
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image
hidden
color
hidden information
plate
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CN110086956A (en
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杨青青
咸政卫
陈官田
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Zenghwa Packaging Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • 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
    • H04N1/40—Picture signal circuits
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
    • H04N1/4051—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a dispersed dots halftone pattern, the dots having substantially the same size
    • H04N1/4052—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a dispersed dots halftone pattern, the dots having substantially the same size by error diffusion, i.e. transferring the binarising error to neighbouring dot decisions
    • 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
    • H04N1/40—Picture signal circuits
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
    • H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern

Abstract

The invention discloses a method for displaying and hiding a floating image effect of a halftone hidden image, which comprises the steps of adding hidden information at different positions in three color plates of a printed image, simultaneously manufacturing a combined visible and hidden grating tool matched with the three color plates, and covering the visible and hidden grating tool on a four-color image containing the hidden information, so that the floating image display effect of the hidden image can be displayed; the information is hidden comprehensively in different color plates, the information is not easy to be imitated by lawbreakers, the floating image effect of the hidden information is realized in the display process of the hidden information, the unique display effect is achieved, the purpose of difficult imitation is achieved, the anti-counterfeiting function of a printed image is enhanced, and the purpose of protecting a printed packaging product is achieved.

Description

Display and hiding method for halftone hidden image floating effect
Technical Field
The invention belongs to halftone image anti-counterfeiting technology of printed matters, and particularly relates to a display and hiding method for a halftone hidden image relief effect.
Background
In the continuous development of the printing industry, technologies such as high-precision scanning and copying are also diversified, which bring convenience to the printing industry and provide illegal business opportunities for the production of counterfeit and shoddy commodities. Illegal copying, forging and other actions of the product seriously infringe the rights and interests of enterprises and consumers. Common printed matter anti-counterfeiting technologies mainly focus on the aspects of material anti-counterfeiting, ink anti-counterfeiting, printing process anti-counterfeiting, halftone hidden image anti-counterfeiting and the like. The halftone image hiding technology is a mode which does not change the existing process of a printing enterprise and does not increase the extra cost of products, and is attracted by enterprises and industries. In the traditional halftone image anti-counterfeiting technology, hidden image-text information is hidden in a certain printing color plate in pre-press image processing, and a physical and chemical display and hiding tool (optical display) is used for displaying the hidden information. Meanwhile, in order to further increase the effect of hidden information, the display of hidden information of 'split joint latent image anti-counterfeiting', 'multi-angle' and 'multiple information' also appears. These effects enrich the methods and theories of halftone image anti-counterfeiting to some extent.
Disclosure of Invention
The invention aims to provide a display and hiding method for a halftone hidden image relief effect, which displays hidden information in a protruding effect, achieves a unique display effect, is not easy to be imitated by lawless persons, and enhances the anti-counterfeiting effect of image information of a printed matter.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for displaying and hiding a floating image effect of a halftone hidden image comprises the following steps:
step 1, newly building an image as a bottom image with hidden information, and filling colors;
step 2, separating the bottom layer image manufactured in the step 1 into four color channels to form four color plates, and respectively screening the four color plates;
step 3, selecting an image or characters as hidden information, removing a background layer, and converting the background layer into a gray image;
step 4, embedding hidden information in a cyan plate (C), a magenta plate (M) and a black plate (K) of the four-color plate which completes the halftone in the step 2, and offsetting the hidden information part;
step 5, combining the four-color plates to complete information hiding;
step 6, manufacturing a display grating layer matched with the cyan plate (C), the magenta plate (M) and the black plate (K) in the step 4, combining the three grating layers, and removing the background to be used as a combined grating layer for carrying out relief display on the hidden information;
and 7, overlapping the combined grating layer manufactured in the step 6 on the four-color hidden image combined in the step 5, and displaying hidden information.
Further, the width of the bottom layer image in the step 1 is 1-30cm, the length is 1-30cm, the resolution is 500-2400dpi, the color mode is a CMYK mode, and the background color is white.
Further, when filling colors in the step 1, the filling color value of each color plate is between 20 and 80 percent.
Further, the screening of the four color plates in the step 2 is performed by using a circular screen in a bitmap mode, and the screening angles of the four color plates of cyan, yellow and black (CMYK) are respectively selected to be 18.4 °, 71.6 °, 0 °, 45 °, and the number of screening lines is 150lpi-175 lpi.
Further, the width of the hidden information in the step 3 is 2-5cm, and the length is 2-5 cm.
Further, the hidden information is embedded in the step 4 by copying the hidden information layer manufactured in the step 3 to the same position of the three color plates of cyan (C), magenta (M) and black (K), and then moving the hidden information of the magenta (M) and black (K) plates to the lower right, wherein the offset range of the hidden information in the magenta (M) plate is 0-15 pixels, and the offset range of the hidden information in the black (K) plate is 8-30 pixels.
Further, the displacement operation in step 4 is to select the selected areas where the hidden information in the three color plates is located, delete the layer where the hidden information is located, and use a displacement formula to displace the hidden information in Photoshop using a filter, where the displacement is determined by the following formula:
Figure GDA0002668492240000031
Figure GDA0002668492240000032
wherein: x, Y are the amounts of displacement, P, in the transverse and longitudinal directions, respectivelylFor the lateral resolution of the image, PcFor the image longitudinal resolution, L is the number of screen lines, and α is the screening angle.
Further, the combined color plates in the step 5 are combined in Photoshop according to the sequence of cyan, magenta, yellow and black.
The invention has the beneficial effects that:
the invention relates to a visualization and hiding method for a halftone hidden image relief effect, which relates to an image processing technology and a printed matter anti-counterfeiting technology, adds hidden information at different positions in three color plates of a printed image when halftoning is carried out on the image, simultaneously manufactures a combined visualization and hiding grating tool matched with the three color plates, and covers the visualization and hiding grating tool on a four-color image containing the hidden information, thus displaying the relief display effect of the hidden image.
Synthesize and carry out information hiding at different color versions, be difficult for being imitated by lawless persons, hidden information realizes hiding the floating map effect of information at the display process for hidden picture and text information can reach unique display effect, has played the distinctive and unusual, the effect of unique tree, and diversified display hidden anti-fake information plays the purpose of difficult imitation, is favorable to further promoting the anti-fake effect of product.
The method does not increase the printing cost, utilizes a unique mode to display the hidden information, enhances the anti-counterfeiting function of the printed image and achieves the purpose of protecting the printed packaging product.
Drawings
FIG. 1 is a flow chart of the floating image display of the halftone hidden image according to the present invention
FIG. 2 is a diagram of hidden information 1
FIG. 3 is a diagram of hidden effect of hidden information
FIG. 4 is a floating-map display of hidden information
FIG. 5 is a diagram of hidden information 2
FIG. 6 is a diagram of hiding effect of the hidden information 2
FIG. 7 is a floating-map display of the hidden information 2
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are not intended to limit the invention thereto.
The invention discloses a method for displaying and hiding a floating image effect of a halftone hidden image, which is specifically implemented according to the following steps, wherein a specific flow chart is shown in figure 1:
step 1, newly building an image as a bottom image with hidden information, and filling colors, wherein the specific process comprises the following steps: newly creating an image file in Photoshop: the image size is 1-30cm in width and 1-30cm in length, the resolution is 500-2400dpi, the color mode is CMYK mode, and the background color is white;
step 2, performing color filling on the new file, wherein the filling color value is 20-80%;
and 3, separating the image file manufactured in the step 2 into four color channels to form four color plates, and respectively screening the four color plates, namely screening the four color plates by using a circular screen point in a bitmap mode, wherein the screening angles of the four color plates of cyan yellow black (CMYK) are respectively selected from 18.4 degrees, 71.6 degrees, 0 degrees, 45 degrees, and the number of screening lines is 150lpi-175 lpi.
Step 4, selecting an image or characters as hidden information, wherein the size range of the image or characters is 2-5cm in width and 2-5cm in length, removing a background layer, and converting the background layer into a gray image;
step 5, embedding hidden information in the same position of a cyan plate (C), a magenta plate (M) and a black plate (K) in the four color plates of which the half tones are finished in the step 3, namely copying the hidden information layer manufactured in the step 3 to the same position of the three color plates of the cyan plate (C), the magenta plate (M) and the black plate (K), and then moving the hidden information in the magenta plate (M) and the black plate (K) to the lower right, wherein the offset range of the hidden information in the magenta plate (M) is 0-15 pixels, and the offset range of the hidden information in the black plate (K) is 8-30 pixels;
step 6, selecting the hidden information in the three color plates set in the step 5, deleting the layer where the hidden information is located, and displacing the hidden information in a filter, wherein the displacement is determined by the following formula:
Figure GDA0002668492240000051
Figure GDA0002668492240000052
wherein: x, Y are the amounts of displacement, P, in the transverse and longitudinal directions, respectivelylFor the lateral resolution of the image, PcThe longitudinal resolution of the image is shown, L is the number of net lines, and alpha is the screening angle;
step 7, combining the four color plates, combining the color plates in Photoshop according to the sequence of C-M-Y-K, and finishing the hiding of information;
step 8, manufacturing a display grating layer matched with the screening parameters of the cyan plate (C), the magenta plate (M) and the black plate (K), wherein the image size of the grating layer is 5cm multiplied by 5cm, the parameters of a single-layer grating comprise the screening angle, the screening line number, the resolution and the mesh point area rate which are equal to the corresponding anti-counterfeiting main color plate, and the grating layer is screened by using a straight line;
step 9, performing background removal operation on the grating layers manufactured in the step 8, and combining the three grating layers to be called a combined grating layer;
and step 10, superposing the combined grating layer manufactured in the step 9 on the four-color hidden image combined in the step 7, and displaying the floating image effect of the hidden information.
Example 1
Step 1, newly building an image as a bottom image with hidden information, and filling colors, wherein the specific process comprises the following steps: newly creating an image file in Photoshop: the image size was 10cm × 10cm, the resolution was 2100dpi, the color mode was CMYK mode, and the background color was white.
And 2, performing color filling on the new file, wherein the filling color value is set to be 30%.
And 3, separating the image file manufactured in the step 2 into four color channels to form four color plates, and respectively screening the four color plates, namely screening the four color plates by using a circular screen point in a bitmap mode, wherein the screening angles of the four color plates of cyan yellow black (CMYK) are respectively selected to be 18.4 degrees, 71.6 degrees, 0 degrees, 45 degrees and the number of screening lines is 175 lpi.
Step 4, taking the graph 2 as hidden information 1, removing a background layer, and converting the background layer into a gray image;
and 5, embedding hidden information at the same position in a cyan plate (C), a magenta plate (M) and a black plate (K) in the four color plates of which the half tones are finished in the step 3, namely copying the hidden information layer manufactured in the step 3 to the same position of the three color plates of the cyan plate (C), the magenta plate (M) and the black plate (K), and then moving the hidden information in the magenta plate (M) and the black plate (K) to the lower right, wherein the offset of the hidden information in the magenta plate (M) is set to be 4 pixels, and the offset of the hidden information in the black plate (K) is set to be 10 pixels.
Step 6, selecting the hidden information in the three color plates set in the step 5, deleting the layer where the hidden information is located, and displacing the hidden information in a filter, wherein the displacement is determined by the following formula:
Figure GDA0002668492240000061
Figure GDA0002668492240000062
wherein: wherein: pl＝Pc2100dpi, 175lpi, 18.4 ° α for cyan (C), 71.6 ° α for magenta (M), 45 ° α for black (K), calculated as: the transverse displacement X and the longitudinal displacement Y of the hidden information in the cyan (C) are respectively 2 and 6; the horizontal displacement X of the hidden information in the magenta plate (M) is 6, and the longitudinal displacement Y is 2; the displacement X of the black plate (K) is 4, and the longitudinal displacement Y is 4.
And 7, combining the four color plates, combining the color plates in a Photoshop according to the sequence of C-M-Y-K to complete information hiding, wherein a four-color hidden image of the hidden information 1 is shown in a figure 3.
Step 8, newly building a display grating layer matched with the screening parameters of the three color plates of the cyan plate (C), the magenta plate (M) and the black plate (K), wherein the size of a single-layer grating is 5cm multiplied by 5cm, the resolution is 2100dpi, the dot area ratio is 30%, the screening shape is linear, the number of screening lines is 175lpi, and the screening angle of the grating layer corresponding to the cyan plate (C) is 18.4 degrees; the grating screening angle corresponding to the magenta plate (M) is 71.6 degrees, and the grating layer screening angle corresponding to the black plate (K) is 45 degrees.
And 9, removing the background layers of the three single-layer gratings, and combining the three single-layer gratings to form a combined grating layer.
And step 10, superposing the combined grating layer manufactured in the step 9 on the four-color hidden image combined in the step 7, so as to display the floating image effect of the hidden information, wherein the display effect is as shown in fig. 4.
Example 2
Step 1, newly building an image as a bottom image with hidden information, and filling colors, wherein the specific process comprises the following steps: newly creating an image file in Photoshop: the image size was 10cm × 10cm, the resolution was 2100dpi, the color mode was CMYK mode, and the background color was white.
And 2, performing color filling on the new file, wherein the filling color value is set to be 30%.
And 3, separating the image file manufactured in the step 2 into four color channels to form four color plates, and respectively screening the four color plates, namely screening the four color plates by using a circular screen point in a bitmap mode, wherein the screening angles of the four color plates of cyan yellow black (CMYK) are respectively selected to be 18.4 degrees, 71.6 degrees, 0 degrees, 45 degrees and the number of screening lines is 175 lpi.
Step 4, taking the graph 5 as hidden information 2, removing a background layer, and converting the background layer into a gray image;
and 5, embedding hidden information in the same position of a cyan plate (C), a magenta plate (M) and a black plate (K) in the four color plates of which the half tones are finished in the step 3, namely copying the hidden information layer manufactured in the step 3 to the same position of the three color plates of the cyan plate (C), the magenta plate (M) and the black plate (K), and then moving the hidden information in the magenta plate (M) and the black plate (K) to the lower right, wherein the offset of the hidden information in the magenta plate (M) is set to be 15 pixels, and the offset of the hidden information in the black plate (K) is set to be 30 pixels.
Step 6, selecting the hidden information in the three color plates set in the step 5, deleting the layer where the hidden information is located, and displacing the hidden information in a filter, wherein the displacement is determined by the following formula:
Figure GDA0002668492240000071
Figure GDA0002668492240000072
wherein: wherein: pl＝Pc2100dpi, 175lpi, 18.4 ° α for cyan (C), 71.6 ° α for magenta (M), 45 ° α for black (K), calculated as: the transverse displacement X and the longitudinal displacement Y of the hidden information in the cyan (C) are respectively 2 and 6; the horizontal displacement X of the hidden information in the magenta plate (M) is 6, and the longitudinal displacement Y is 2; black colourThe displacement X of the plate (K) is 4, and the longitudinal displacement Y is 4.
And 7, combining the four color plates, combining the color plates in a Photoshop according to the sequence of C-M-Y-K to finish the information hiding, wherein a four-color hidden image of the hidden information 2 is shown in FIG. 6.
Step 8, newly building a display grating layer matched with the screening parameters of the three color plates of the cyan plate (C), the magenta plate (M) and the black plate (K), wherein the size of a single-layer grating is 5cm multiplied by 5cm, the resolution is 2100dpi, the dot area ratio is 30%, the screening shape is linear, the number of screening lines is 175lpi, and the screening angle of the grating layer corresponding to the cyan plate (C) is 18.4 degrees; the grating screening angle corresponding to the magenta plate (M) is 71.6 degrees, and the grating layer screening angle corresponding to the black plate (K) is 45 degrees.
And 9, removing the background layers of the three single-layer gratings, and combining the three single-layer gratings to form a combined grating layer.
And step 10, superposing the combined grating layer manufactured in the step 9 on the four-color hidden image combined in the step 7, so as to display the floating image effect of the hidden information 2, wherein the display effect is as shown in fig. 7.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (6)

1. A method for displaying and hiding a floating image effect of a halftone hidden image is characterized by comprising the following steps:
step 1, newly building an image as a bottom image with hidden information, and filling colors;
step 2, separating the bottom layer image manufactured in the step 1 into four color channels to form four color plates, respectively screening the four color plates in a bitmap mode, screening the four color plates by using a circular screen, and selecting the screening angles of the four color plates of cyan yellow black (CMYK) to be 18.4 degrees, 71.6 degrees, 0 degrees, 45 degrees and the screening line number to be 150lpi-175lpi respectively;
step 3, selecting an image or characters as hidden information, removing a background layer, and converting the background layer into a gray image;
step 4, embedding hidden information in a cyan plate (C), a magenta plate (M) and a black plate (K) of the four-color plate which completes the halftone in the step 2, and offsetting the hidden information part;
step 5, combining the four-color plates to complete information hiding;
step 6, manufacturing a display grating layer matched with the cyan plate (C), the magenta plate (M) and the black plate (K) in the step 4, combining the three grating layers, and removing the background to be used as a combined grating layer for carrying out relief display on the hidden information;
embedding hidden information, namely copying the hidden information layer manufactured in the step 3 to the same position of three color plates of a cyan plate (C), a magenta plate (M) and a black plate (K), and then moving the hidden information of the magenta plate (M) and the black plate (K) to the lower right, wherein the offset range of the hidden information in the magenta plate (M) is 0-15 pixels, and the offset range of the hidden information in the black plate (K) is 8-30 pixels; and 7, overlapping the combined grating layer manufactured in the step 6 on the four-color hidden image combined in the step 5, and displaying hidden information.
2. The method for displaying and hiding a floating image effect of a halftone hidden image according to claim 1, wherein: the width of the bottom layer image in the step 1 is 1-30cm, the length is 1-30cm, the resolution is 500-2400dpi, the color mode is CMYK mode, and the background color is white.
3. The method for displaying and hiding a floating image effect of a halftone hidden image according to claim 1, wherein: and when the color is filled in the step 1, the filling color value of each color plate is between 20 and 80 percent.
4. The method for displaying and hiding a floating image effect of a halftone hidden image according to claim 1, wherein: in the step 3, the width of the hidden information is 2-5cm, and the length of the hidden information is 2-5 cm.
5. The method for displaying and hiding a floating image effect of a halftone hidden image according to claim 1, wherein: the displacement operation in the step 4 is to select the selected areas where the hidden information in the three color plates is located, delete the layer where the hidden information is located, and displace the hidden information in Photoshop by using a displacement formula and using a filter, wherein the displacement is determined by the following formula:
Figure FDA0002668492230000021
Figure FDA0002668492230000022
wherein: x, Y are the amounts of displacement, P, in the transverse and longitudinal directions, respectivelylFor the lateral resolution of the image, PcFor the image longitudinal resolution, L is the number of screen lines, and α is the screening angle.
6. The method for displaying and hiding a floating image effect of a halftone hidden image according to claim 1, wherein: the color plates combined in the step 5 are combined in Photoshop according to the sequence of cyan, magenta, yellow and black.
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