CN107688843B - Hologram generating method and device containing watermark information - Google Patents
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Abstract
The invention discloses a hologram generating method containing watermark information, which comprises the following steps: selecting a watermark area on an original image, and embedding watermark information in the watermark area to generate a watermark image containing the watermark information; dividing the watermark image into a plurality of different regional graphs according to a preset expression effect, and setting a corresponding spatial frequency parameter for each regional graph; preprocessing the watermark image to obtain at least one channel gray image; acquiring the gray value of each pixel point of the channel gray image; acquiring a grating angle value corresponding to the gray value of each pixel point of the channel gray image according to a preset corresponding relation list, and acquiring a grating fringe frequency corresponding to each pixel point according to a spatial frequency parameter corresponding to the regional graph to which each pixel point of the channel gray image belongs; and generating a data packet by the grating angle value of each pixel point of the acquired channel gray image and the corresponding grating fringe frequency according to a preset rule, and acquiring the hologram containing the watermark information according to the data packet.
Description
Technical Field
The invention relates to the technical field of laser holographic anti-counterfeiting, in particular to a hologram generation method and a hologram generation device.
Background
The laser holographic anti-fake technology is one kind of visible graph and text information produced on product by means of laser rainbow hologram plate making technology and mold pressing duplication technology. With the comprehensive utilization of computer dot matrix photoetching technology, 3D true color holographic technology, multiple and dynamic imaging technology and other technologies, the development of laser holographic anti-counterfeiting technology at higher level is promoted. The encryption technologies such as optical random interference fringes, optical micro, dynamic holography, space stereo, digital dot matrix images and the like developed by the technology are continuously emerging and become the mainstream direction of laser holographic anti-counterfeiting at present. These encryption schemes are all implemented at the laser platemaking stage using various special techniques that combine optical and computer information processing.
The digital watermarking technology is increasingly applied to modern printing anti-counterfeiting as a new anti-counterfeiting technology with high technical content, low cost and convenient application, and achieves good effect. The digital watermark can not only realize the addition of the digital watermark information into the digital information, but also realize the accurate extraction of the digital information through a scanner, a digital camera or special equipment after the digital information is printed or printed and output to a paper medium. The method is widely applied to the fields of digital information copyright protection, presswork anti-counterfeiting, information source tracing and the like.
With the continuous innovation of various novel anti-counterfeiting technologies, high-end products increasingly need solutions combining multiple anti-counterfeiting technologies. The holographic anti-counterfeiting technology and the digital watermark have the technical characteristics respectively, and the combination of the digital watermark technology and the holographic anti-counterfeiting technology also remains simple combination, such as printing digital watermark information on the surface of an existing hologram or combining a transparent material printed with the digital watermark information and an existing holographic anti-counterfeiting image to form the combination of the two technologies. However, this simple combination is detrimental to the brightness and aesthetics of the hologram, and also increases the false positive and response time due to interference from holographic diffracted light when extracting the watermark information.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method and a device for generating a hologram containing watermark information, wherein the watermark information and the hologram are organically fused together, so that the hologram not only has the light variation characteristics of the hologram, but also can be embedded with the watermark information to realize stronger anti-counterfeiting.
The technical scheme provided by the invention is as follows:
the invention discloses a hologram generating method containing watermark information, which comprises the following steps: s100, selecting a watermark area on an original image, and embedding watermark information in the watermark area to generate a watermark image containing the watermark information; s200, dividing the watermark image into a plurality of different regional graphs according to a preset expression effect, and setting a corresponding spatial frequency parameter for each regional graph; s300, preprocessing the watermark image to obtain at least one channel gray image; s400, obtaining the gray value of each pixel point of the channel gray image; s500, acquiring a grating angle value corresponding to the gray value of each pixel point of the channel gray image according to a preset corresponding relation list, and acquiring a grating stripe frequency corresponding to each pixel point according to a spatial frequency parameter corresponding to a regional graph to which each pixel point of the channel gray image belongs; s600, generating a data packet according to the grating angle value of each pixel point of the acquired channel gray image and the corresponding grating stripe frequency according to a preset rule, photoetching on a photoetching plate according to the data packet, and developing to obtain the hologram containing the watermark information.
According to the invention, the watermark information is embedded in the original image, and the watermark information is expressed by diffraction of the holographic microstructure, so that perfect integration of the digital watermark technology and the holographic technology is realized, the brightness and the aesthetic degree of the hologram can be kept, meanwhile, the interference and the misjudgment rate of the hologram in the process of identifying and extracting the watermark information are reduced, and the response time is greatly shortened.
Further, before the step S100, the method further includes the steps of: and S000, pre-configuring the preset corresponding relation list.
Further, the step S100 "embed watermark information in the watermark region" further includes the steps of: and S110, embedding watermark information in at least one channel of the watermark image by adopting a preset watermark algorithm.
Further, the step S300 of preprocessing the watermark image to obtain at least one channel grayscale image further includes the steps of: s310, acquiring a noise point information graph of the watermark image; s320, channel separation is carried out on the noise information graph to obtain the channel gray level image of at least one channel.
Further, the method between step S300 and step S400 further includes the steps of: and S350, adjusting the gray scale threshold value of the channel gray scale image within a preset gray scale range.
Further, the predetermined gray scale range is 30 to 220.
Further, the value of the spatial frequency parameter ranges from 200LP/mm to 1000 LP/mm.
Further, the range of the grating angle value is 0 degree to 180 degrees.
The invention also discloses a device for generating the hologram with the watermark information, which uses any one of the methods for generating the hologram with the watermark information, and comprises the following steps: the watermark image generating module is used for selecting a watermark area on the original image, embedding watermark information in the watermark area and generating a watermark image containing the watermark information; the setting module is used for dividing the watermark image into a plurality of different region graphs according to a preset expression effect and setting a corresponding spatial frequency parameter for each region graph; the image preprocessing module is used for preprocessing the watermark image to obtain at least one channel gray level image; the gray value acquisition module is used for acquiring the gray value of each pixel point of the channel gray image; the grating angle value acquisition module is used for acquiring a grating angle value corresponding to the gray value of each pixel point of the channel gray image according to a preset corresponding relation list; the grating fringe frequency acquisition module is used for acquiring the grating fringe frequency corresponding to each pixel point according to the spatial frequency parameter corresponding to the regional graph to which each pixel point of the channel gray level image belongs; the data packet generating module is used for generating a data packet according to the grating angle value and the corresponding grating stripe frequency of each pixel point of the acquired channel gray level image according to a preset rule; and the hologram generating module is used for photoetching on a photoetching plate according to the data packet and developing to obtain the hologram containing the watermark information.
Further, still include: and the configuration module is used for configuring the preset corresponding relation list in advance.
Further, still include: and the adjusting module is used for adjusting the gray scale threshold value of the channel gray scale image within a preset gray scale range.
Compared with the prior art, the invention combines the watermark information with the hologram, and realizes the expression of hidden information on the holographic microstructure by corresponding the gray value of the watermark image with the grating angle value for photoetching, thereby not only protecting the beauty and brightness of the hologram, but also avoiding the interference of the reading of the watermark information in the hologram, solving the limitation of the combined application of the two in the prior art, expanding the application range of the digital watermark, and simultaneously increasing a composite holographic anti-counterfeiting technology.
Drawings
The present invention will be further described in the following detailed description of preferred embodiments, which is to be read in connection with the accompanying drawings.
FIG. 1 is a schematic diagram of the main steps of a hologram production method containing watermark information according to the present invention;
FIG. 2 is a schematic diagram of one embodiment of the present invention;
FIG. 3 is a schematic view of another embodiment of the present invention;
FIG. 4 is a schematic diagram of yet another embodiment of the present invention;
FIG. 5 is a schematic view of another embodiment of the present invention;
FIG. 6 is a schematic diagram of the main components of a hologram forming apparatus containing watermark information according to the present invention;
FIG. 7 is a schematic diagram of a hologram forming apparatus containing imprinted information according to the present invention.
The reference numbers illustrate:
1. the system comprises a watermark image generation module, a setting module, a3 image preprocessing module, a 4 gray value acquisition module, a 5 grating angle value acquisition module, a 6 grating stripe frequency acquisition module, a 7 data packet generation module, a 8 hologram generation module, a 9 configuration module, a 10 adjustment module.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
Fig. 1 is a schematic diagram of main steps of a hologram generating method containing imprinted information according to the present invention, and as shown in fig. 1, the hologram generating method containing imprinted information includes the steps of: s100, selecting a watermark area on an original image, and embedding watermark information in the watermark area to generate a watermark image containing the watermark information; s200, dividing the watermark image into a plurality of different regional graphs according to a preset expression effect, and setting a corresponding spatial frequency parameter for each regional graph; s300, preprocessing the watermark image to obtain at least one channel gray image; s400, obtaining the gray value of each pixel point of the channel gray image; s500, acquiring a grating angle value corresponding to the gray value of each pixel point of the channel gray image according to a preset corresponding relation list, and acquiring a grating stripe frequency corresponding to each pixel point according to a spatial frequency parameter corresponding to a regional graph to which each pixel point of the channel gray image belongs; s600, generating a data packet according to the grating angle value of each pixel point of the acquired channel gray image and the corresponding grating stripe frequency according to a preset rule, photoetching on a photoetching plate according to the data packet, and developing to obtain the hologram containing the watermark information.
Specifically, the original image can be an anti-counterfeiting mark or an anti-counterfeiting texture, and a brand-new anti-counterfeiting graphic image with attractive composition is generally designed by taking a LOGO, a pattern, character information and the like of a customer as design elements or materials and integrating factors such as anti-counterfeiting technical expression effect, mark manufacturing process requirements, dimension specifications and the like. The selection of the watermark region in the invention is selected by a client or a designer, and in the design process, the watermark information is embedded in which region or graph and whether the final effect of the region is compatible with the effect of other graphs or not are considered. However, the actual operation process may decide to add the embedded watermark information after the design pattern is determined. This requires selecting a relatively large area of the image as the watermark region for embedding the watermark.
According to the invention, the watermark information is embedded in the original image, and the watermark information is expressed by diffraction of the holographic microstructure, so that perfect integration of the digital watermark technology and the holographic technology is realized, the brightness and the aesthetic degree of the hologram can be kept, meanwhile, the interference and the misjudgment rate of the hologram in the process of identifying and extracting the watermark information are reduced, and the response time is greatly shortened.
Preferably, before S100, the method further includes: and S000, pre-configuring the preset corresponding relation list.
Preferably, the step S100 "embedding watermark information in the watermark region" further includes the steps of: and S110, embedding watermark information in at least one channel of the watermark image by adopting a preset watermark algorithm.
Specifically, the watermark information may be substantially a digital secret information expression form such as numbers, letters, even graphic patterns, and the like, and embedding the watermark information in the watermark region of the original image means transforming the image in the selected watermark region by a specific watermark embedding algorithm, embedding the watermark information in the image in the watermark region by an encoding method (encoding into 01 bits), and specifically transforming a parameter value of a certain channel of the image.
Preferably, the step S300 of preprocessing the watermark image to obtain at least one channel grayscale image further includes the steps of: s310, acquiring a noise point information graph of the watermark image; s320, channel separation is carried out on the noise information graph to obtain the channel gray level image of at least one channel.
Specifically, the watermark information can be respectively embedded into 3 channels, the channel gray level image of each single channel is obtained in a channel separation mode, and the watermark information is embedded into the multiple channels, so that the anti-counterfeiting strength is increased.
The watermark embedding algorithm adopted by the invention is to embed watermark information into a certain channel of the image and then output the watermark image in an RGB mode, so that the channel gray level image containing the encrypted watermark information can be obtained only after the channel is separated. This step can also be omitted if the "watermark embedding software" existing in the prior art is a module with its own output mode conversion.
Preferably, the method further includes, between step S300 and step S400: and S350, adjusting the gray scale threshold value of the channel gray scale image within a preset gray scale range. Preferably, the preset gray scale range is 30 to 220.
The invention adjusts the gray scale threshold of the channel gray scale image by establishing the gradual change mapping model, and can also achieve the same effect by changing the color level. And is not particularly limited herein. The invention designs the gray value and the grating angle to be in one-to-one correspondence, so the gray value is the grating angle value, and further the direction of the diffraction light of the grating is controlled, and the diffraction light is adjusted to the preset gray scale range because the diffraction light of the grating in the range can be collected by the camera lens and then converted into an electric signal for operation. And diffraction light at grating angles outside this range cannot be collected by the camera, which becomes invalid information. Therefore, in order to record and restore the encrypted signal carried by the watermark image to the maximum extent, the gray scale threshold is preferably in the preset gray scale range. Specifically, the gray level threshold is adjusted to the preset gray level range in the invention to adapt to the operation standard, and meanwhile, the preset gray level range 30 to 220 is also the optimal range value obtained by a designer through multiple experiments.
Preferably, the value of the spatial frequency parameter ranges from 200LP/mm to 1000 LP/mm.
The invention carries out region segmentation on a watermark image embedded with watermark information, and aims to set different spatial frequency parameters for different region graphs so as to realize different microstructure stripes and show rich colors.
Preferably, the grating angle value ranges from 0 degrees to 180 degrees.
Specifically, step S600 "generate a data packet according to the grating angle value and the corresponding grating fringe frequency of each pixel point of the acquired channel gray image according to a preset rule" includes:
1. when watermark information is only embedded in a single channel of the watermark image, a dot matrix is generated on the photoetching offset plate according to the number of pixel points of the channel gray level image and is used for point-by-point exposure. The channel gray level image of the channel in which the watermark information is embedded is obtained, specifically, a noise information map of the watermark image is obtained, channel separation is performed on the noise information map, and the channel gray level image of the channel in which the watermark information is embedded is obtained.
Acquiring a gray value of each pixel point of the channel gray image, acquiring a grating angle value corresponding to the gray value of each pixel point according to a preset corresponding relation list, and acquiring a grating stripe frequency corresponding to each pixel point according to a spatial frequency parameter corresponding to a regional graph to which each pixel point of the channel gray image belongs.
And photoetching the corresponding pixel points on the photoetching offset plate according to the grating angle value and the grating fringe frequency of each pixel point.
FIG. 2 is a schematic diagram of an embodiment of the present invention. As shown in fig. 2, a represents a pixel point of the channel gray image, a represents a pixel point of the lithography offset, and when watermark information is embedded in a single channel, the pixel point a is subjected to lithography according to the grating angle value and the grating fringe frequency of the pixel point a of the channel gray image.
2. When watermark information is embedded into a plurality of channels of the watermark image, the number of pixel points on the photoetching plate is increased and is larger than the sum of the number of the pixel points of the plurality of channels. Taking two channels as an example, the following are specific:
and acquiring channel gray level images of two channels embedded with watermark information, specifically acquiring noise information maps of the watermark images, performing channel separation on the noise information maps, and respectively acquiring the channel gray level images of each channel.
Respectively obtaining the gray value of each pixel point in each channel gray image, obtaining the grating angle value corresponding to the gray value of each pixel point according to a preset corresponding relation list, and obtaining the grating stripe frequency corresponding to each pixel point according to the spatial frequency parameter corresponding to the regional graph to which each pixel point of the channel gray image belongs.
And increasing the number of pixel points on the photoetching offset plate to be the sum of the number of pixel points of the two-channel gray level image. FIG. 3 is a schematic diagram of another embodiment of the present invention. As shown in fig. 3, a represents a pixel point of a first channel gray image, B represents a pixel point of another channel gray image, a, B, c, d represent a pixel point of a photolithography offset plate respectively, when watermark information is embedded in two channels, photolithography is performed on the pixel point a of the photolithography offset plate according to the grating angle value and the grating fringe frequency of the pixel point a of the first channel gray image, photolithography is performed on the pixel point B of the photolithography offset plate according to the grating angle value and the grating fringe frequency of the pixel point B of the another channel gray image, and the remaining pixel points c and d on the photolithography offset plate are vacant and are not subjected to photolithography. As can be seen from fig. 3, the resolution of the offset lithography plate is 4 times the resolution of the channel gray scale image.
The above embodiments are merely two examples, including but not limited to the above two cases. If watermark information is embedded in the three channels, correspondingly, the resolution of the photoetching offset plate is only required to be improved, and the number of pixel points on the photoetching offset plate is larger than the sum of the pixel points of the gray level images of the three channels. FIG. 4 is a schematic diagram of another embodiment of the present invention. As shown in fig. 4, a represents a pixel point of a first channel gray image, B represents a pixel point of a second channel gray image, C represents a pixel point of a third channel gray image, a, B, C, d represent a pixel point of a photolithography offset plate respectively, when watermark information is embedded in three channels, photolithography is performed on the pixel point a of the photolithography offset plate according to the grating angle value and the grating stripe frequency of the pixel point a of the first channel gray image, photolithography is performed on the pixel point B of the photolithography offset plate according to the grating angle value and the grating stripe frequency of the pixel point B of the second channel gray image, photolithography is performed on the pixel point C of the photolithography offset plate according to the grating angle value and the grating stripe frequency of the pixel point C of the third channel gray image, and the remaining pixel point d of the photolithography offset plate is vacant and is not subjected to photolithography.
FIG. 5 is a schematic diagram of another embodiment of the present invention. As shown in fig. 5, a represents a pixel point of the first channel gray image, B represents a pixel point of the second channel gray image, C represents a pixel point of the third channel gray image, a1, a2, a3, B1, B2, B3, C1, C2, C3 are pixel points on the lithographic offset plate respectively, photoetching is carried out on three pixel points a1, a2 and a3 according to the grating angle value and the grating stripe frequency of the pixel point A of the first channel gray level image, that is, the pixel point a of the first channel gray image is represented by three pixel points on the photolithography offset plate, and similarly, photoetching is carried out on three pixel points B1, B2 and B3 according to the grating angle value and the grating stripe frequency of the pixel point B of the second channel gray level image, and photoetching on three pixel points of C1, C2 and C3 according to the grating angle value and the grating stripe frequency of the C pixel point of the third channel gray level image.
It can be known from the above embodiments that the present invention does not specifically limit a pixel point for representing a channel gray image by using several pixel points on a lithography offset plate, and the pixel point is defined by itself according to actual needs.
Specifically, the structure of the diffraction grating in the hologram according to the present invention is not limited to the hologram technology, but may be formed by a method including various mechanical processing structures, chemical etching, a photomask technology, a semiconductor lithography technology, an ion lithography technology, an electron beam lithography technology, etc. which can generate or form grating structures of different angles and frequencies.
Meanwhile, in order to improve the aesthetic degree of the hologram, other anti-counterfeiting technical characteristics or grating microstructure information can be nested in the digital watermark hologram, and the application method is not limited to the method of separating graphic blocks, separating pixel filter points with various distribution proportions or superposing a multi-grating structure.
Specifically, the hologram is microscopically composed of concave-convex relief type grating stripes with different frequencies and different angles, after the hologram containing watermark information is generated by adopting the method, the microstructure stripes represented by the hologram are recorded on the photoetching plate, and the microstructure stripes on the photoetching plate are solidified on the wear-resistant reusable hard metal material because the photoetching plate is very fragile, easy to damage and incapable of being copied in batches.
The metal template containing the microstructure stripes, or the laser template, is usually obtained by silver spraying and electroforming. Specifically, the method comprises the following technical processes:
1. a silver conductive layer is formed on the surface of the photoetching offset plate hologram by a chemical silvering method so as to make the silver conductive layer conductive.
2. The photoetching offset plate with the silver conducting layer is used as a cathode, the cathode is placed in electrolyte containing nickel ions, and metal nickel is plated on a silver layer of the cathode by utilizing the principle of electrolytic plating and is deposited to a certain thickness.
3. And taking out the plate deposited with the nickel metal with a certain thickness, removing the glass plate, and washing away the photoresist on the surface layer of the metal plate to obtain the hologram metal template with the mirror image pattern.
4. Similarly, the hologram metal template is put into the electroforming equipment as the cathode again, and a mirror image second generation metal template can be obtained, and the descendant metal template can be copied by the same method.
5. The holographic pattern can be transferred and copied on various plastic materials by using the metal template, and then the holographic product, namely the anti-counterfeiting product, can be obtained.
The anti-counterfeiting product generated by the method is generally a laser packaging material, and piracy can be prevented by identifying the anti-counterfeiting product. The specific identification process is as follows:
and acquiring optical information diffracted by the hologram on the anti-counterfeiting label, and acquiring corresponding holographic data according to the optical information. The holographic data refers to the grating fringe frequency and the grating angle value of each pixel point. And acquiring image data corresponding to the holographic data according to the preset corresponding relation list, wherein the image data refers to the gray value of the pixel point. And (4) corresponding the grating angle value and the gray value by self-defining a preset corresponding relation list to obtain the gray value of each pixel point. And calculating the gray value by adopting a preset algorithm, acquiring a watermark characteristic value, comparing whether the watermark characteristic value is matched with preset watermark information or not, and feeding back correct watermark information when the watermark characteristic value is matched with the preset watermark information.
FIG. 6 is a schematic diagram of the main components of a hologram forming apparatus containing watermark information according to the present invention. As shown in fig. 5, a hologram generating apparatus including watermark information, which uses the hologram generating method including the watermark information, includes: the watermark image generating module 1 is used for selecting a watermark area on an original image, embedding watermark information in the watermark area and generating a watermark image containing the watermark information; the setting module 2 is used for dividing the watermark image into a plurality of different region graphs according to a preset expression effect and setting a corresponding spatial frequency parameter for each region graph; the image preprocessing module 3 is used for preprocessing the watermark image to obtain at least one channel gray level image; the gray value obtaining module 4 is used for obtaining the gray value of each pixel point of the channel gray image; a grating angle value obtaining module 5, configured to obtain, according to a preset correspondence list, a grating angle value corresponding to a gray value of each pixel point of the channel gray image; the grating stripe frequency acquisition module 6 is configured to acquire a grating stripe frequency corresponding to each pixel point according to a spatial frequency parameter corresponding to a regional pattern to which each pixel point of the channel grayscale image belongs; the data packet generating module 7 is configured to generate a data packet according to a preset rule by using the obtained grating angle value of each pixel point of the channel grayscale image and the corresponding grating fringe frequency; and the hologram generating module 8 is used for performing photoetching on a photoetching plate according to the data packet and developing to obtain the hologram containing the watermark information.
FIG. 7 is a schematic diagram of a hologram forming apparatus containing imprinted information according to the present invention. Preferably, as shown in fig. 7, the method further includes: a configuration module 9, configured to pre-configure the preset correspondence list.
Preferably, the method further comprises the following steps: and the adjusting module 10 is configured to adjust a gray scale threshold of the channel gray scale image within a preset gray scale range.
The invention combines the watermark information with the hologram, and realizes the expression of hidden information on the holographic microstructure by corresponding the gray value of the watermark image with the grating angle value for photoetching, thereby not only protecting the beauty and brightness of the hologram, but also avoiding interfering the reading of the watermark information in the hologram, solving the limitation of the combination application of the two in the prior art, expanding the application range of the digital watermark, and simultaneously increasing a composite holographic anti-counterfeiting technology.
It should be noted that the information interaction, execution process, and other contents between the modules in the apparatus are based on the same concept as the method embodiment, and specific contents may refer to the description in the method embodiment of the present invention, and are not described herein again.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (11)
1. A method of generating a hologram containing imprinted information, comprising the steps of:
s100, selecting a watermark area on an original image, and embedding watermark information in the watermark area to generate a watermark image containing the watermark information;
s200, dividing the watermark image into a plurality of different regional graphs according to a preset expression effect, and setting a corresponding spatial frequency parameter for each regional graph;
s300, preprocessing the watermark image to obtain at least one channel gray image;
s400, obtaining the gray value of each pixel point of the channel gray image;
s500, acquiring a grating angle value corresponding to the gray value of each pixel point of the channel gray image according to a preset corresponding relation list, and acquiring a grating stripe frequency corresponding to each pixel point according to a spatial frequency parameter corresponding to a regional graph to which each pixel point of the channel gray image belongs;
s600, generating a data packet according to the grating angle value of each pixel point of the acquired channel gray image and the corresponding grating stripe frequency according to a preset rule, photoetching on a photoetching plate according to the data packet, and developing to obtain the hologram containing the watermark information.
2. The method for generating a hologram including printed information according to claim 1, wherein said step of S100 is preceded by the step of:
and S000, pre-configuring the preset corresponding relation list.
3. The method for generating a hologram including watermark information according to claim 1, wherein the step S100 "embedding watermark information in the watermark region" further comprises the steps of:
and S110, embedding watermark information in at least one channel of the watermark image by adopting a preset watermark algorithm.
4. The method for generating a hologram including watermark information according to claim 3, wherein the step S300 of preprocessing the watermark image to obtain at least one channel gray scale image further comprises the steps of:
s310, acquiring a noise point information graph of the watermark image;
s320, channel separation is carried out on the noise information graph to obtain the channel gray level image of at least one channel.
5. The method for generating a hologram including printed information according to claim 1, further comprising the steps of, between step S300 and step S400:
and S350, adjusting the gray scale threshold value of the channel gray scale image within a preset gray scale range.
6. The method for generating a hologram including watermark information according to claim 5, wherein the predetermined gray scale range is 30 to 220.
7. The method of generating a hologram comprising imprinted information according to claim 1, wherein the value of the spatial frequency parameter ranges from 200LP/mm to 1000 LP/mm.
8. The method of generating a hologram comprising imprinted information according to claim 1, wherein the grating angle value ranges from 0 degrees to 180 degrees.
9. A hologram producing apparatus containing watermark information, using the hologram producing method containing watermark information according to any one of claims 1 to 8, comprising:
the watermark image generating module is used for selecting a watermark area on the original image, embedding watermark information in the watermark area and generating a watermark image containing the watermark information;
the setting module is used for dividing the watermark image into a plurality of different region graphs according to a preset expression effect and setting a corresponding spatial frequency parameter for each region graph;
the image preprocessing module is used for preprocessing the watermark image to obtain at least one channel gray level image;
the gray value acquisition module is used for acquiring the gray value of each pixel point of the channel gray image;
the grating angle value acquisition module is used for acquiring a grating angle value corresponding to the gray value of each pixel point of the channel gray image according to a preset corresponding relation list;
the grating fringe frequency acquisition module is used for acquiring the grating fringe frequency corresponding to each pixel point according to the spatial frequency parameter corresponding to the regional graph to which each pixel point of the channel gray level image belongs;
the data packet generating module is used for generating a data packet according to the grating angle value and the corresponding grating stripe frequency of each pixel point of the acquired channel gray level image according to a preset rule;
and the hologram generating module is used for photoetching on a photoetching plate according to the data packet and developing to obtain the hologram containing the watermark information.
10. The apparatus for generating a hologram including imprinted information according to claim 9, further comprising:
and the configuration module is used for configuring the preset corresponding relation list in advance.
11. The apparatus for generating a hologram including imprinted information according to claim 9, further comprising:
and the adjusting module is used for adjusting the gray scale threshold value of the channel gray scale image within a preset gray scale range.
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