CN108307203B - Film encryption method, decryption method based on multi-projector splicing fusion - Google Patents
Film encryption method, decryption method based on multi-projector splicing fusion Download PDFInfo
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- CN108307203B CN108307203B CN201711465803.4A CN201711465803A CN108307203B CN 108307203 B CN108307203 B CN 108307203B CN 201711465803 A CN201711465803 A CN 201711465803A CN 108307203 B CN108307203 B CN 108307203B
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- 230000000740 bleeding effect Effects 0.000 description 3
- 238000004040 coloring Methods 0.000 description 3
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
- H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
- H04N21/26613—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel for generating or managing keys in general
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream decryption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4408—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream encryption, e.g. re-encrypting a decrypted video stream for redistribution in a home network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/482—End-user interface for program selection
- H04N21/4821—End-user interface for program selection using a grid, e.g. sorted out by channel and broadcast time
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/835—Generation of protective data, e.g. certificates
- H04N21/8358—Generation of protective data, e.g. certificates involving watermark
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/3147—Multi-projection systems
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Human Computer Interaction (AREA)
- Computer Networks & Wireless Communication (AREA)
- Databases & Information Systems (AREA)
- Projection Apparatus (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
The invention belongs to video-encryption fields; more particularly to a kind of film encryption method based on multi-projector splicing fusion, decryption method; aim to solve the problem that the film film source encryption and decryption technique of film Copyright Protection; this method includes: that (1) parameterizes division to projection screen, selects encryption section；(2) password is generated on the target machine using encryption software；(3) password is converted to binary number, selects its preceding n generation film encryption mask；(4) during rendering generates film, superposition watermark mask generates encrypted screener；(5) link is being played, is calling same encipheror, generating and encrypting same password, and switching to binary system ordered series of numbers, generating splicing fusion decryption configuration parameter；(6) splicing fusion software calls decryption configuration parameter, plays encrypted screener film source, realizes that decryption plays.The present invention, which is realized, splices fusion film encryption technology for multi-projector special type curtain.
Description
Technical field
The invention belongs to video-encryption fields, and in particular to a kind of film encryption side based on multi-projector splicing fusion
Method, decryption method.
Background technique
Curved surface multi-projector splicing with ring curtain, spherical screen stereoscopic film etc. for representative merges extraordinary film, is to occur early 20th century
The big view subtended angle special type curtain film of one kind.The shooting of big view subtended angle motion picture film and the production of cartoon scene, use ultra-wide angle
Fish eye lens or image multiple-camera compound lens.Curtain is in a ring or hemispherical, spectators are surrounded staying wherein.Due to
It is big that image regards subtended angle to spectators, and with surround sound, so that spectators have sense on the spot in person.Due to ring curtain, spherical screen stereoscopic film
Curtain is huge, projector placing space is limited, and one projector can not make entire screen.And since one projector is shown
Limited resolution, therefore output is shown in such a way that more projector splicings merge.
Due to splicing fusion film view subtended angle is big, film viewing distance is close, causes entire film source resolution ratio big, make
It is high to make period length, cost of manufacture.It therefore is the key issues of the industry development for the protection of film copyright.If not to film source
Encryption, and only to playing program or splicing fusion program encryption, then not can be well protected film.Therefore, the present invention provides
A kind of pair of film film source encrypts, and the encryption and decryption technique of broadcasting can only be decrypted correctly on formulating broadcasting machine.
The present invention proposes a kind of encrypting and decrypting skill based on multi-projection system integration technology aiming at the problem that copyright protection
Art.Encryption ring nodule is closed the parametric grid division of projection splicing fusion, Crypto++ programmed algorithm, film later period system by the technology
Make technology, generates encryption film source；In decryption link, the color change link knot that decrypting process is merged with multi-projector splicing
It closes, broadcasting is decrypted.Only encrypt and decrypt keying sequence equally just can be in the case where being generated on formulating player
Obtain correct movie play back effect.The present invention realizes the good protection to film source, cleverly utilizes extraordinary film splicing fusion
Technical characteristic, the multi-projector splicing integration technology that encryption and decryption technique is invented with the present inventor is integrally combined.
Film encryption technology based on splicing fusion is made of technology segment in detail below: encryption part is to target curtain
Parametrization grid is established, encryption section is selected according to parametrization grid, Crypto++ algorithm is then run and generates the machine password simultaneously
It is converted into binary system ordered series of numbers.It establishes binary system ordered series of numbers and parameterizes the corresponding relationship in mesh refinement section, according to password binary system
Sequence generates encrypted watermark mask figure.Each frame of the film source of unencryption and watermark mask figure are done into phase using post-production software
Multiply post-processing, using treated result as the film source of encryption.Part is played in decoding, it is same to call Crytpo++ generation close
Code is simultaneously converted to binary sequence, each equally established in binary sequence is corresponding with each grid of encryption section
Relationship, by deciphering module with splicing merge in color attenuation module unite to form new color change manner, realize solve
Heavy seeding is put.Simultaneously for other machines or place broadcasting the case where, due to generate clear crytpographic key and Crypted password it is inconsistent and
It cannot obtain correctly decrypting and play result.
Summary of the invention
In order to solve the above problem in the prior art, in order to solve the film film source encryption of film Copyright Protection
Decryption technology, an aspect of of the present present invention propose a kind of film encryption method based on multi-projector splicing fusion, including following
Step:
Step A1 carries out parameterized mesh to projection screen, and selects encryption section；
Step A2 generates password using encryption software to the parametric grid of the encryption section respectively on the target machine；
Step A2 password generated is converted to binary number by step A3, selects its preceding n generation film encryption
mask；
Step A4, during rendering generates projection film, superposition watermark mask generates encrypted screener.
Further, described that parameterized mesh is carried out to projection screen, and encryption section is selected, method are as follows:
By projection screen according to parametrization equation model split be (M+1) * (N+1) a parametric grid, wherein parameter net
Lattice point coordinate is [i, j] (i=0,1,2,3...M；J=0,1,2,3...N)；
It selects integration region for encryption section, determines the corresponding parametric grid in the encryption section.
Further, described that step A2 password generated is converted to binary number, select its preceding n generation film to add
Close mask, method are as follows:
Step A2 password generated is converted to binary number；
Based on default decaying method for generating cipher code, the mesh refinement mask color RGB that serial number i is corresponded on mask figure is calculated
Component color decaying password Ei。
Further, the default decaying method for generating cipher code is
Wherein, DiFor the corresponding binary number of each grid ID.
Further, the superposition watermark mask generates encrypted screener, method are as follows:
It is encrypted by each frame of the watermark superposition program to the film source to be maintained secrecy；The mode of encryption is watermark and original image
The mode of multiplication.
Further, the encryption software is that Crypto++ password generates library.
Another aspect of the present invention, propose it is a kind of based on multi-projector splicing fusion film decryption method, including with
Lower step:
Step B1 identifies encryption section；
Step B2 calls used encryption software when generating password, gives birth to respectively to the parametric grid of the encryption section
At password same as encryption；
Step B2 password generated is converted to binary number by step B3, generates splicing fusion decryption configuration parameter；
Step B4, splicing fusion software call decryption configuration parameter, play encrypted screener film source, broadcasting is decrypted.
Further, it is carrying out executing step B2 when splicing fusion plays.
Further, described that step B2 password generated is converted to binary number, generate splicing fusion decryption configuration
Parameter, method are as follows:
Step B2 password generated is converted to binary number；
Based on default decaying method for generating cipher code, the mesh refinement mask color RGB that serial number i is corresponded on mask figure is calculated
Component color decaying password Ei, generating color enhances password Ei′。
Further, the default decaying method for generating cipher code is
Wherein, DiFor the corresponding binary number of each grid ID；
The color enhances password Ei' be
The encrypting and decrypting problem of present invention film extraordinary for ring curtain, ball curtain etc., proposes a set of based on to film film source
The technology for playing decryption is merged in encryption in conjunction with splicing, realizes encryption, decryption in film authorization playing process, for extraordinary shadow
Piece intellectual property protection provides a kind of reliable guarantee.The ingenious speical play mode that extraordinary film is utilized of the present invention, will
Encrypting and decrypting is combined together with film source granting, film source broadcasting, the intellectual property protection in the field is provided a kind of completely new
Resolution policy.
Detailed description of the invention
Fig. 1 is that the present invention is based on the film encryption methods of multi-projector splicing fusion, decryption method flow diagram；
Fig. 2 is that curtain mesh parameterization divides schematic diagram；
Fig. 3 is ordered series of numbers schematic diagram corresponding with grid corresponding relationship；
Fig. 4 is encryption ring section flow diagram；
Fig. 5 is decryption link flow diagram；
Fig. 6 is encrypting and decrypting links effect picture.
Specific embodiment
The preferred embodiment of the present invention described with reference to the accompanying drawings.It will be apparent to a skilled person that this
A little embodiments are used only for explaining technical principle of the invention, it is not intended that limit the scope of the invention.
The present invention carries out parameterized mesh to target projection curtain, selectes encryption section；It is local in specified player
It runs Crypto++ password and generates Software Create keying sequence；Binary sequence is converted by password, by the every of binary sequence
Each of bit and encryption section grid correspond, and generate add corresponding with encryption section parametrization grid
Close mask watermark figure；In AE (Adobe After Effect), using the mode for the addition watermark that is multiplied, do not add with mask code and
Each frame picture of close film source carries out multiplication operation and obtains encrypted film source；Link is played in decryption, for broadcasting specified
The case where machine sowing is put is put, Crypto++ is first called to generate password same as encryption link before playing and is converted into binary system sequence
Column, using the sequence each 0,1 information as decryption link color bleeding parameter, with the present inventor invent splicing merge
The colouring intensity attenuation process of software combines.The new color attenuation parameter comprising solution confidential information is generated, to encryption film source
Each frame plays out, can since the keying sequence generated in the decryption link of specified player is consistent with encryption link
With correct decryption encrypt film source, and for other machines or other movie theatres broadcasting the case where, due to decrypted sequences and encryption
Sequence is inconsistent therefore cannot correctly restore film source color.To what is merged according to above step realization based on multi-projector splicing
Film encrypting and decrypting play-back technology.
The present invention includes the film encryption method based on multi-projector splicing fusion, the shadow based on multi-projector splicing fusion
Piece decryption method, two methods match using encryption, the decryption oprerations that could be completed to film, realize the processing of a completion
Process.As shown in Figure 1, (1) ciphering process: target curtain being carried out parameterized mesh and selected encryption section, specified
Target machine on call player password to generate software (Crypto++) to produce player the machine keying sequence, and converted
For binary system ordered series of numbers, the corresponding relationship of encryption section parametrization grid and Crypted password binary sequence is established, encryption is generated
Mask watermark figure generates encrypted screener film source (since the binary number of keying sequence has generated, so generating in post-production
Mask watermark figure is encrypted, encrypted screener film source is generated in post-production can carry out strange land processing)；(2) decrypting process: the mistake
Journey is run simultaneously when playing film, and operation Crypto++ generates clear crytpographic key and is converted into binary system ordered series of numbers first, is generated and is spelled
Connect fusing and decoding configuration information, and based on this by binary number column information be fused to that splicing fusion plays it is color transformed in,
Splicing fusion it is color transformed in together with color decaying together complete decryption play.And if only if on the specified machine of authorization
When playing encryption film source, film source just can be decoded correctly；And when being played on other machines, encryption film source will not be correct
Decoding.To realize the copyright protection to film source.
The film encryption method based on multi-projector splicing fusion of the embodiment of the present invention, comprising:
Step A1 carries out parameterized mesh to projection screen, and selects encryption section.
Parameterized mesh is carried out to target curtain, as shown in Fig. 2, by taking ring curtain as an example: by curtain according to parametrization side
The model split of journey is (M+1) * (N+1) a parametric grid.Parametric grid point coordinate thereon: [i, j] (i=0,1,2,
3...M；J=0,1,2,3...N).Coordinate is put on the cylinder of the corresponding ring curtain of the mesh coordinate are as follows: [i* Δ θ, j* Δ h].This hair
In bright, selecting the region of encryption is corresponding circle of sensation, parameter section corresponding to corresponding circle of sensation are as follows: i ∈ [i0, i1].In Fig. 2, filament and
The grid of thick line is target curtain parametrization grid, and thick line portion therein is encryption section, while being also color blend region；
Step A2 generates password using encryption software to the parametric grid of the encryption section respectively on the target machine.
It calls Crypto++ password to generate library, password C is generated on player0, by password C0It is converted into binary sequence
C1.(i before selection1-i0) N, the digit of each bit corresponds to the fusion grid that ID (code bit) is the digit.Two into
The corresponding relationship of ordered series of numbers processed and curtain parametric grid, as shown in figure 3, code bit be 1,2,3,4,5 ..., corresponding code value be 0,0,1,
1,1…；
Step A2 password generated is converted to binary number by step A3, selects its preceding n generation film encryption
mask。
As shown in figure 3, according to the corresponding binary digit D of each grid IDiIt is 0 or 1, generates splicing fusion encryption
The mesh refinement mask color RGB component color decaying password E that ID is i is corresponded on mask, mask figureiGenerating mode such as formula
(1) shown in:
Encryption mask figure generated, which is one, (i1-i0) N number of grid grayscale image, the gray value of each grid is by this
Position corresponds to ID decaying password EiIt is determined as 0.5 or 1.
Step A4, during rendering generates projection film, superposition watermark mask generates encrypted screener.
As shown in figure 4, after player (server) generates password mask, in AE (Adobe After Effects)
It is encrypted using each frame of the watermark superposition program to the film source to be maintained secrecy.What the mode of encryption was multiplied using watermark with original image
Mode.By being multiplied, so that former piece is realized in encryption section part and is encrypted.If the corresponding ID of grid in encrypted region declines
Subtract password: EiWhen being 0.5, the meshing colouring intensity of the encrypted each frame of film source becomes half before encrypting；
And EiWhen being 1, the meshing colouring intensity of each frame of film source and encryption are preceding consistent after encryption.Encrypted video source in this way
Encryption section just generate color shade variation arrangement cipher round results.
The film decryption method based on multi-projector splicing fusion of the invention, in the link of broadcasting to encryption film source into
Row splicing fusion and decryption simultaneously operating, the process that the process of decryption is merged with splicing is unified to be carried out.Splicing fusion is using spelling
Fusion software is connect, geometric transformation is carried out according to each frame image of the parameter grid division to film source and color bleeding forms splicing and melts
It closes.
For the film source not encrypted, the splicing fusion program called in the present invention is to film source according to curtain shape and curtain
The relative position and attitude relationship of cloth and projector, carry out geometric transformation make the projection unit split screen of each projector intact with
The intact fitting in the projection part of curtain and other projectors, completes the function of film multi-projector splicing part；It is right simultaneously
In the overlapping region of different projectors, Alhpa transformation is carried out to the color of different projectors, it may be assumed that remote according to it to chroma-luminance
Decay with a distance from non-fused region, so that the projection of chroma-luminance and single projector after the overlapping of multiple projectors is imitated
Fruit is consistent, completes the color bleeding partial function of multi-projector.
In the present invention, completely the same for encrypted film source geometric transformation part and not encrypted film source, and
In color change part other than carrying out color decaying, it is decrypted simultaneously.The effect of decryption is only to run on player
The fusion program of splicing containing decryption of the invention can be just decrypted correctly, and for attempting to play the encrypted screener on other machines
Situation, all there can be no correct decryption to play.
The film decryption method based on multi-projector splicing fusion of the embodiment of the present invention, comprising the following steps:
Step B1 identifies encryption section；
Step B2 calls used encryption software when generating password, gives birth to respectively to the parametric grid of the encryption section
At password same as encryption；
Step B2 password generated is converted to binary number by step B3, generates splicing fusion decryption configuration parameter；
Step B4, splicing fusion software call decryption configuration parameter, play encrypted screener film source, broadcasting is decrypted.
Decryption method of the present invention is illustrated in order to clearer, detailed process combination Fig. 5 is described again: first
It is first, when fusion playing program is spliced in operation, Crypto++ password generating programs, generation and ciphering process are run in the machine
In identical password (if in specified player operation, the password is different for other machines), and it is this is close
Code is converted into binary code.Enhance password E based on default decaying method for generating cipher code building colori' calculation formula, such as formula
(2) shown in.For Crypted password EiFor 0.5 grid, splicing fusion program is other than completing normal color attenuation change, also
It will be according to EiFor 0.5 this information, to chroma-luminance multiplied by 2；And for Crypted password EiFor 1 grid, only carry out and without encryption
Film source play the decaying of duplicate color.Such just complete merges decrypting process to the splicing of encryption film source.
And be directed to and attempting the case where playing this encryption film source on other machines, due to running Crypto on other machines
++ obtained password and Crypted password are not consistent, then there will not be correct decrypted result.Its final playing display
As a result some grid blocks are had obviously secretly in other parts, and other grid blocks are bright in other parts, or even specular occur
Domain.It thus can not correctly play the encrypted screener.
Fig. 6 is encrypting and decrypting links effect picture.Wherein, Fig. 6 a is unencryption film source single frames effect picture, and Fig. 6 b is to add
Close film source single frames effect picture, Fig. 6 c are that decryption film source plays single frames effect picture.
It is directed to using same player the case where other movie theatres play, since the several of invention program are merged in this splicing
What conversion section is the machine play position calculating setting for specified film, then for other movie theatres due to curtain
Size is different, each projector and curtain to put relative position and attitude different, therefore the same program of operation will not obtain just
True splicing fusion results.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can be executed with hardware, processor
The combination of software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only memory
(ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field
In any other form of storage medium well known to interior.
Those skilled in the art should be able to recognize that, side described in conjunction with the examples disclosed in the embodiments of the present disclosure
Method step, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate electronic hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is executed actually with electronic hardware or software mode, specific application and design constraint depending on technical solution.
Those skilled in the art can use different methods to achieve the described function each specific application, but this reality
Now it should not be considered as beyond the scope of the present invention.
Term " includes " or any other like term are intended to cover non-exclusive inclusion, so that including a system
The process, method of column element not only includes those elements, but also other elements including being not explicitly listed, or further includes
The intrinsic element of these process, methods.
So far, it has been combined preferred embodiment shown in the drawings and describes technical solution of the present invention, still, this field
Technical staff is it is easily understood that protection scope of the present invention is expressly not limited to these specific embodiments.Without departing from this
Under the premise of the principle of invention, those skilled in the art can make equivalent change or replacement to the relevant technologies feature, these
Technical solution after change or replacement will fall within the scope of protection of the present invention.
Claims (8)
1. a kind of film encryption method based on multi-projector splicing fusion, which comprises the following steps:
Step A1 carries out parameterized mesh to projection screen, and selects encryption section；
Step A2 generates password using encryption software to the parametric grid of the encryption section respectively on the target machine；
Step A2 password generated is converted to binary number by step A3, selects its preceding n generation film encryption mask；
Step A4, during rendering generates projection film, superposition watermark mask generates encrypted screener；
Wherein, described that step A2 password generated is converted to binary number, its preceding n generation film encryption mask is selected,
Its method are as follows:
Step A2 password generated is converted to binary number；
Based on default decaying method for generating cipher code, the mesh refinement mask color RGB component that serial number i is corresponded on mask figure is calculated
Color decaying password Ei。
2. the film encryption method according to claim 1 based on multi-projector splicing fusion, which is characterized in that described right
Projection screen carries out parameterized mesh, and selects encryption section, method are as follows:
By projection screen according to parametrization equation model split be (M+1) * (N+1) a parametric grid, wherein parametric grid point
Coordinate is [i, j] (i=0,1,2,3...M；J=0,1,2,3...N)；
It selects integration region for encryption section, determines the corresponding parametric grid in the encryption section.
3. the film encryption method according to claim 2 based on multi-projector splicing fusion, which is characterized in that described pre-
If decaying method for generating cipher code is
Wherein, DiFor the corresponding binary number of each grid ID.
4. the film encryption method according to claim 2 based on multi-projector splicing fusion, which is characterized in that described folded
Watermarking mask generates encrypted screener, method are as follows:
It is encrypted by each frame of the watermark superposition program to the film source to be maintained secrecy；The mode of encryption is that watermark is multiplied with original image
Mode.
5. the film encryption method according to claim 1-4 based on multi-projector splicing fusion, feature exist
In the encryption software is that Crypto++ password generates library.
6. a kind of film decryption method based on multi-projector splicing fusion, which comprises the following steps:
Step B1 identifies encryption section；
Step B2 calls used encryption software when generating password, the parametric grid of the encryption section is generated respectively and
Encrypt same password；
Step B2 password generated is converted to binary number by step B3, generates splicing fusion decryption configuration parameter；
Step B4, splicing fusion software call decryption configuration parameter, play encrypted screener film source, broadcasting is decrypted；
Wherein, described that step B2 password generated is converted to binary number, generate splicing fusion decryption configuration parameter, side
Method are as follows:
Step B2 password generated is converted to binary number；
Based on default decaying method for generating cipher code, the mesh refinement mask color RGB component that serial number i is corresponded on mask figure is calculated
Color decaying password Ei, generating color enhances password E 'i。
7. the film decryption method according to claim 6 based on multi-projector splicing fusion, which is characterized in that carrying out
Splicing fusion executes step B2 when playing.
8. the film decryption method according to claim 7 based on multi-projector splicing fusion, which is characterized in that described pre-
If decaying method for generating cipher code is
Wherein, DiFor the corresponding binary number of each grid ID；
The color enhances password E 'iFor
Priority Applications (1)
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| CN1608361A (en) * | 2001-10-26 | 2005-04-20 | 松下电器产业株式会社 | Digital work protection system, key management apparatus, and user apparatus |
| CN103886543A (en) * | 2014-04-02 | 2014-06-25 | 海南大学 | Volume data robust multi-watermark method based on three-dimensional DFT perceptual Hashing |
| CN105025281A (en) * | 2015-06-29 | 2015-11-04 | 北京中科盘古科技发展有限公司 | Large-dimension full dome super-clear film playing and interaction application splicing fusion method |
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| US6611599B2 (en) * | 1997-09-29 | 2003-08-26 | Hewlett-Packard Development Company, L.P. | Watermarking of digital object |
| US6463162B1 (en) * | 1998-09-30 | 2002-10-08 | Hewlett-Packard Company | Robust watermarking for digital objects |
| CN1194530C (en) * | 2003-05-10 | 2005-03-23 | 合肥工业大学 | Image waterprint method for copyright protection |
| CN100419791C (en) * | 2006-10-26 | 2008-09-17 | 丹东东方测控技术有限公司 | Method for removing visual watermark of block local encrypted digital image |
| CN102103738B (en) * | 2011-03-04 | 2012-11-07 | 西南交通大学 | Method for generating and authenticating digital image tampered content recoverable variable capacity watermarks |
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| CN1608361A (en) * | 2001-10-26 | 2005-04-20 | 松下电器产业株式会社 | Digital work protection system, key management apparatus, and user apparatus |
| CN103886543A (en) * | 2014-04-02 | 2014-06-25 | 海南大学 | Volume data robust multi-watermark method based on three-dimensional DFT perceptual Hashing |
| CN105025281A (en) * | 2015-06-29 | 2015-11-04 | 北京中科盘古科技发展有限公司 | Large-dimension full dome super-clear film playing and interaction application splicing fusion method |
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