CN1992794A - Digital camera with the function of digital watermark - Google Patents
Digital camera with the function of digital watermark Download PDFInfo
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- CN1992794A CN1992794A CN 200510003430 CN200510003430A CN1992794A CN 1992794 A CN1992794 A CN 1992794A CN 200510003430 CN200510003430 CN 200510003430 CN 200510003430 A CN200510003430 A CN 200510003430A CN 1992794 A CN1992794 A CN 1992794A
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Abstract
The invention relates to a digit camera with digit watermark function, which comprises optical system, digit image sensing system, key memory unit storing the key, encrypting unit for encrypting the watermark information, and information embed unit for adding watermark information into image data, and identification information generator for decrypting the watermark via the key stored in memory or comparing the identification information. The invention uses the key as the main element in identification, to relate picture and camera, while the picture with watermark can not pass the identification by camera.
Description
[affiliated technical field]
The present invention relates to a kind of digital camera, realize that particularly digital camera is as necessary device in the interpolation of digital watermarking and the proof procedure.
[background technology]
Increasingly mature along with digital watermarking, the system that adds digital watermarking is more and more, and simultaneously, the corresponding verification system that adds digital watermarking system is also more and more with and related methods.Utilize various software logarithmic code photos to make amendment, edit non-difficult matter, this gives and to alter the information that digital photograph writes down and brought facility, especially want photo such as insurance, contract, bill as electronic evidence for some, their true integrality just seems particularly important.Therefore just drawn the problem of the true integrated authentication of digital photograph.The existing way that addresses this problem realizes by the built-in photo fidelity device of digital camera.
The background technology relevant with authentication with digital watermarking can be consulted following several pieces of documents:
[1] the Chinese patent literature Granted publication that " embeds the system and the image modification detection system of authentication information to image " number: CN1091329C, the applying date: 1997.10.27;
[2] patent document of the applicant's application " method of digital figure watermark and related device and the digital camera that can add watermark " application number: 200510055680.8, the applying date: 2005.3.23;
[3] patent document " a kind of fragile watermarks technology is applied to the method for the digital image fidelity " application number of the applicant's application: 2004100811718, the applying date: 2004.10.10.
Disclosed the detection that embeds authentication information and image modification to image in above document, provide to have the digital camera that embeds the authentication information function to image, this authentication information is used for detecting the image original of shooting.
But prior art can not verify effectively whether this photo is necessarily broken forth by a certain digital camera when checking.If someone knows key, grasp the method for adding fragile watermark again, on PC, realize adding the operation of fragile watermark after just photo can being altered again, then we still can't be determined a certain true integrality of having added the photo of fragile watermark.Because we can't draw the operation that this photo is the interpolation fragile watermark finished by camera by checking when taking.
For utilizing robust watermarking to prove author's copyright, also there is same problem.Come claimed if there are other people to hold this photo personation owner after having added same watermark on the PC, we can't confirm real right ownership person, also just can not ensure real obligee's lawful right.
[summary of the invention]
In order to address the above problem, the present invention is by providing a kind of digital camera with the digital watermarking function, after being provided, the secret key encryption watermark information that provides by camera adds watermark to captured image when taking, when needs are verified, in proof procedure, also must participate in by camera, provide key by camera, can carry out the checking work of normal digital watermarking, otherwise be verified as defective.Can adopt technological means to guarantee that it can only be possessed by camera to this key, can't obtain from other approach.Other people have been stopped thus because can access key and grasp the method for adding watermark and in image, add watermark and when checking, be verified by qualified situation.Whether the present invention can be used for clear and definite photo is the image that certain camera is recorded truly, also can be used for the ownership of clear and definite photo simultaneously, that is, only having this camera and utilizing this camera checking result is qualified people, is only the real owner of this photo.
Further, in order to solve the problem that the user produces when using other people camera and take, we can take multi-parameter to calculate the method for key, for example, can be with anyone the unknowable identifying code and the individual password combination of importing of establishing in the camera, produce anyone a unknowable new key, watermark information is encrypted according to this new key.Like this in when checking, just must obtain the identifying code of camera itself and the individual password of importing and just can obtain the key that can decode, finish checking work smoothly.
For this reason, the present invention solves the technical scheme of its technical problem and is:
A kind of digital camera with the digital watermarking function, comprise optical system, the digitized video induction system, the key storing unit that has key, ciphering unit of watermark information being encrypted according to key and the information that the watermark information after the described encryption is added in the view data embed the unit, also comprise:
The authorization information generation unit that the key of storing in according to described key storing unit in when checking is decrypted the watermark information that extracts from view data to be verified or comparison information is encrypted.
The key of described key storing unit stored can only encrypted unit or the authorization information generation unit call.
The information of described watermark information for extracting in the zone the image before adding watermark.
Described watermark information is for importing or preestablish the extrasneous information in the digital camera immediately.
Described ciphering unit, in establish computations function or algorithm, cooperate computations function or algorithm to generate watermark information after encrypting according to the key in the key storing unit.
Also comprise a password input unit, described ciphering unit is to the password of described password input unit input and key makes up and according to the new key that the combination back forms watermark information is encrypted.
Described key storing unit, ciphering unit and the encrypted encapsulation of authorization information generation unit, any destruction to encapsulation will cause the key stored in the described key storing unit unavailable.
Described digital camera comprises that also one is used for extracting from image to be verified the unit of extracting of watermark information.
Described digital camera also comprise one after will encrypting comparison information with from image to be verified, extract the comparing unit that watermark information is compared.
The described communication interface that can link to each other that also comprises with the computer of band verification system, watermark information that described verification system will extract from view data to be verified or comparison information send to described authorization information generation unit by communication interface, and the comparison information after watermark information after described authorization information generation unit will be deciphered or the encryption returns to the verification system of described computer by described communication interface.
Reach known patent documentation compared to existing technology, the present invention relates to have outstanding substantive distinguishing features and significant technological progress is fairly obvious: like this with the key established in the camera as the essential elements in the proof procedure, realized photo is set up related purpose with camera, solved the problem that in the past can't accurately judge the authenticity of the photo of shooting.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
[description of drawings]
Fig. 1 is the interior logic diagram that adds watermark of the digital camera of the first embodiment of the present invention.
Fig. 2 is the block diagram representation that ciphering unit generates new copyright information in the first embodiment of the present invention.
Fig. 3 is the logic diagram in digital camera when checking of the first embodiment of the present invention.
Fig. 4 is the block diagram representation that the digital camera of the second embodiment of the present invention adds digital watermarking.
Fig. 5 is the logic diagram in digital camera when checking of the second embodiment of the present invention.
[embodiment]
In the prior art, disclosed a large amount of methods of in view data, adding watermark, the method and the verification method that utilize digital camera to add digital watermarking in image have wherein also been arranged.As Granted publication number is that the Chinese patent literature of CN1091329C " embeds the system and the image modification detection system of authentication information " to image.Be not difficult to find step of utilizing key to encrypt of ubiquity in the operation of existing interpolation digital watermarking.And the present invention need call step that key finishes will verify the time and also transfers to camera and carry out, and so just there is no need to make key to be known by other people or equipment except that camera.Can adopt simultaneously technological means to guarantee that key only possessed by camera, and can not leak.Any so is not all can't just can be prevented that analogue camera interpolation watermark is played tricks on PC by this camera correct verification by the photo that this camera adds watermark.
The digital camera of interpolation that has disclosed in the prior art and checking digital watermarking comprises: optical system, the digitized video induction system, the key storing unit that has key, ciphering unit of watermark information being encrypted according to key and the information that the watermark information after the described encryption is added in the view data embed the unit, innovative point of the present invention is that this camera also comprises: the authorization information generation unit that the key of storing in according to described key storing unit in when checking is decrypted the watermark information that extracts from view data to be verified or comparison information is encrypted.
The first embodiment of the present invention is applied to the camera for the added robust watermarking of hiding writer identity information, and details are as follows:
Character with uniqueness or the numerical value identifying code of the key that this camera provides for producing at random in the camera production process is implanted to it in camera key memory cell then.Watermark information in the present embodiment is the copyright information that is preset in the digital camera memory, for example, the copyright information of establishing in the memory is " all rights reserved for Zhang San ", key according to the key storing unit stored is encrypted this copyright information, generate new copyright information and add in the view data, obtain the new data image as digital watermarking.Certainly, watermark information also can be the copyright information of the instant input of user.
As shown in Figure 1, the key in the key storing unit by be provided with specific technology such as match parameter realize can only encrypted unit or the authorization information generation unit call.Here, ciphering unit calls identifying code from the key storing unit of depositing the camera identifying code be key, and simultaneously, " all rights reserved for Zhang San " this copyright information also enters ciphering unit; In ciphering unit, according to key " all rights reserved for Zhang San " encrypted, for example: through the copyright information after this encryption of scrambling algorithm generation " copyright Zhang San owns ".The described ciphering unit copyright information information that sends to after will " copyright Zhang San all " this encryption embeds the unit, embeds in unit in this information " copyright Zhang San all " added in the original digital image data, generates new view data.
Further, in order to solve the photo attaching problem that the user produces when using other people camera and take, we can take multi-parameter to calculate the method for key, and as shown in Figure 2, digital camera can also comprise an input password unit in the present embodiment.Password by user's input, identifying code in the key storing unit of establishing in the camera, produce a new key by ciphering unit, and copyright information is encrypted according to this new key, copyright information after obtaining encrypting adds the copyright information after this encryption in the view data new view data of generation.
Similarly, when checking, must obtain this identifying code in key storing unit is key, could decipher to obtain accurately " all rights reserved for Zhang San " this copyright information in the authorization information generation unit.Otherwise, can't verify, also can't draw correct copyright information.
What present embodiment was set forth is that checking is operated in the situation of carrying out on the camera, so this digital camera also comprises the unit of extracting that is used to extract watermark information.As shown in Figure 3, when verifying in camera in the present embodiment, the unit of extracting extracts a watermark information from view data to be verified, and the authorization information generation unit calls this watermark information that extracts and the key in the key storing unit; According to this key the watermark information that this extracts is decrypted, restore a copyright information, if the copyright information that restores is " all rights reserved for Zhang San ", illustrate that then this view data that is verified is obtained by this TV station digital camera interpolation digital watermarking in the present embodiment.If can't restore " all rights reserved for Zhang San ", illustrate that then the view data that is verified is not obtained by this TV station digital camera interpolation digital watermarking.
Authorization information generation unit, ciphering unit and key storing unit all are positioned at digital camera inside in the present embodiment.And, reveal for preventing key, key storing unit, ciphering unit and the encrypted encapsulation of authorization information generation unit, any destruction to encapsulation will cause the key stored in the described key storing unit unavailable.Encrypting encapsulation technology is ripe prior art, is not repeated here.
In addition, the part work of the proof procedure of present embodiment can be finished by computer, and this computer for example passes through communication interface: USB interface, blue tooth interface, IEEE1394 interface etc. are connected with digital camera.Understandable, the work of the unit of extracting can be transferred to the verification system of computer and finish.Only need to send to the authorization information generation unit of camera by communication interface as the watermark information of extracting out.Copyright information after will deciphering then returns to computer by communication interface, feeds back final result by computer to the operator.
Whether truly the second embodiment of the present invention is applied to verifying photo complete fragile watermark camera, and details are as follows:
As shown in Figure 4, add the block diagram representation of watermark for digital camera in the second embodiment of the invention.As shown in Figure 5, verify the block diagram representation of watermark for digital camera in the second embodiment of the invention.Granted publication disclosed in detail in number by the Chinese patent literature of CN1091329C a kind of system that adds watermark and checking the system and the correlation method of interpolation watermark, with this basis as present embodiment prior art part, for in the prior art with the present invention in same steps as only do simple introduction here, then elaborate for innovation point of the present invention.Equally, in the present embodiment, the necessary component the when digital camera of taking pictures becomes the checking watermark.
When carrying out shooting operation with this digital camera, as shown in Figure 4, wherein, prior art comprises: optical system, CCD, image processor, this image processor comprise: signal processing unit, area dividing unit, hidden unit, and regional assembled unit; And cooperate image processor to encrypt: digest calculations unit, ciphering unit and key K.The operating procedure of adding watermark is as follows:
The first step, reference object be by optical system, enters signal processing unit in the image processor by CCD again, and CCD and signal processing unit have constituted a digitized video induction system, are used to gather digitized picture signal, and this system also can adopt CMOS;
Second step obtained view data D through after the signal processing unit processes, and this view data D enters the area dividing unit again, and D is divided into region D 1 and region D 2 in area dividing cell picture data;
The 3rd step, region D 1 is sent to the digest calculations unit, through calculating hashed value H, this hashed value H is by the summary based on the feature of the calculating presentation video of view data, this summary is a summary of presentation video data characteristics, even and hashed value H be characterised in that sensitively the change of the change of a pixel in the reaction picture material and become diverse numerical value;
In the 4th step, hashed value H is sent to ciphering unit, in ciphering unit, hashed value H is encrypted according to key K, and the hashed value H ' after the output encryption.Hashed value H ' after the encryption is a watermark information.
In this step, need key storing unit and ciphering unit to finish jointly, comprising:
1, calling of key K:
Key K is stored in the key storing unit, and its implantation process is with embodiment one, and production firm does not keep this key.As hashed value H from the digest calculations unit when ciphering unit transmits, the encrypted cell call of key K.
2, encrypted process:
H '=P (the K that is responsible for carrying out computations is arranged in ciphering unit in addition, H) function/method, wherein, K, H is a parameter, and K is a new key, and H is for sending to the hashed value of ciphering unit from the digest calculations unit, after obtaining, new key K will move P () function/method, the hashed value H ' after obtaining encrypting.
The hashed value H ' that draws by above two processes can reach fully that anyone is unknowable.
In the 5th step, this hashed value H ' is sent in the hidden unit in the image processor.Sending to region D 2 in the hidden unit with the area dividing unit passes through hidden unit and will go output image region D 2 ' among the D2 of H ' Adding Area.
In the 6th step, in the regional assembled unit in image processor, region D 1 is combined with the image-region D2 ' that has added hashed value H ', generates the hiding data D ' of combination.
In the 7th step, this signal is exported as the hiding data D ' of digital signal, and is stored in such as in the memories such as storage card.
When on camera itself, carrying out verification operation with this digital camera, as shown in Figure 5, digital camera in the present embodiment comprises the region identification block that has in the prior art, extract unit and digest calculations unit, also comprises: key storing unit, authorization information generation unit and comparing unit.The operating procedure of checking digital watermarking is as follows:
The first step, region identification block obtains view data D ', and D ' is identified as the region D 1 that is used for producing hashed value H, and two zones that have been added the region D 2 ' of the hashed value H ' after encrypting;
D1 is sent to the digest calculations unit, recalculate hashed value H, and hashed value H is sent to the authorization information generation unit as comparison information.
In second step, the region D 2 ' that has been added digital watermarking that receiving area, the unit recognition unit of extracting sends over extracts hashed value H ", this H " is sent to comparing unit.
The 3rd step, when hashed value H was sent to the authorization information generation unit, the authorization information generation unit called the key K that is stored in the key storing unit, according to key K hashed value H was encrypted, calculate the hashed value H ' after the encryption, and send to comparing unit.
In the 4th step, in comparing unit, second step and the 3rd is gone on foot the hashed value H that extracts that draws respectively, and " and the hashed value H ' after encrypting compares.
The 5th step, reach a conclusion, if two values are in full accord, illustrate that then this is verified photograph is the real image of being taken by this camera, if two values are inequality, illustrate that then this photo is not the real image of being taken by this camera.
In addition, the part work of the proof procedure of present embodiment can be finished by computer, and this computer for example passes through communication interface: USB interface, blue tooth interface, IEEE1394 interface etc. are connected with digital camera.Understandable, the work of aforementioned areas recognition unit, the unit of extracting, digest calculations unit and comparing unit can be finished by the verification system of computer.Only need to send to the authorization information generation unit of camera by communication interface as the hashed value H of comparison information.Hashed value H ' after will encrypting then returns to computer by communication interface, finishes comparison process by the verification system of computer.
In sum; for the person of ordinary skill of the art; can make other various corresponding changes and distortion according to technical scheme of the present invention and technical conceive, and all these changes and distortion all should belong to the protection range of claim of the present invention.
Claims (10)
1, a kind of digital camera with the digital watermarking function, comprise optical system, the digitized video induction system, the key storing unit that has key, ciphering unit of watermark information being encrypted according to key and the information that the watermark information after the described encryption is added in the view data embed the unit, it is characterized in that also comprising:
The authorization information generation unit that the key of storing in according to described key storing unit in when checking is decrypted the watermark information that extracts from view data to be verified or comparison information is encrypted.
2, the digital camera of band digital watermarking function according to claim 1, it is characterized in that the key of described key storing unit stored can only encrypted unit or the authorization information generation unit call.
3, the digital camera of band digital watermarking function according to claim 1 is characterized in that the information of described watermark information for extracting in the zone the image before adding watermark.
4, the digital camera of band digital watermarking function according to claim 1, it is characterized in that for described watermark information for importing or preestablish the extrasneous information in the digital camera immediately.
5, the digital camera of band digital watermarking function according to claim 1, it is characterized in that described ciphering unit, in establish computations function or algorithm, cooperate computations function or algorithm to generate watermark information after encrypting according to the key in the key storing unit.
6, the digital camera of band digital watermarking function according to claim 1, it is characterized in that also comprising a password input unit, described ciphering unit is to the password of described password input unit input and key makes up and according to the new key that the combination back forms watermark information is encrypted.
7, the digital camera of band digital watermarking function according to claim 1, it is characterized in that described key storing unit, ciphering unit and the encrypted encapsulation of authorization information generation unit, any destruction to encapsulation will cause the key stored in the described key storing unit unavailable.
8, the digital camera of band digital watermarking function according to claim 1 is characterized in that also comprising that one is used for extracting from image to be verified the unit of extracting of watermark information.
9, according to the digital camera of claim 1 or 8 described band digital watermarking functions, it is characterized in that also comprising one after will encrypting comparison information with from image to be verified, extract the comparing unit that watermark information is compared.
10, the digital camera of band digital watermarking function according to claim 1, it is characterized in that also comprising the communication interface that can link to each other with the computer of band verification system, watermark information that described verification system will extract from view data to be verified or comparison information send to described authorization information generation unit by communication interface, and the comparison information after watermark information after described authorization information generation unit will be deciphered or the encryption returns to the verification system of described computer by described communication interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510003430 CN1992794A (en) | 2005-12-31 | 2005-12-31 | Digital camera with the function of digital watermark |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510003430 CN1992794A (en) | 2005-12-31 | 2005-12-31 | Digital camera with the function of digital watermark |
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| CN1992794A true CN1992794A (en) | 2007-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200510003430 Pending CN1992794A (en) | 2005-12-31 | 2005-12-31 | Digital camera with the function of digital watermark |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8170208B2 (en) | 2008-02-28 | 2012-05-01 | Fujitsu Limited | Image decrypting apparatus, image encrypting apparatus, and image decrypting method |
| CN108900929A (en) * | 2018-08-08 | 2018-11-27 | 北京奇安信科技有限公司 | A kind of image watermark signature processing method and processing device |
| WO2019201079A1 (en) * | 2018-04-16 | 2019-10-24 | 深圳市联软科技股份有限公司 | Method for generating watermark on the basis of graphic, system, terminal, and medium |
-
2005
- 2005-12-31 CN CN 200510003430 patent/CN1992794A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8170208B2 (en) | 2008-02-28 | 2012-05-01 | Fujitsu Limited | Image decrypting apparatus, image encrypting apparatus, and image decrypting method |
| WO2019201079A1 (en) * | 2018-04-16 | 2019-10-24 | 深圳市联软科技股份有限公司 | Method for generating watermark on the basis of graphic, system, terminal, and medium |
| US11704764B2 (en) | 2018-04-16 | 2023-07-18 | Shenzhen Leagsoft Technology Co, Ltd. | Method and system for generating watermark on the basis of graphic, terminal, and medium |
| CN108900929A (en) * | 2018-08-08 | 2018-11-27 | 北京奇安信科技有限公司 | A kind of image watermark signature processing method and processing device |
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