WO2008128383A1

WO2008128383A1 - Digital camera and its system for watermark information acquiring via external device

Info

Publication number: WO2008128383A1
Application number: PCT/CN2007/001350
Authority: WO
Inventors: Jun Feng; Xin Tian
Original assignee: Aigo Research Institute Of Image Computing Co., Ltd
Priority date: 2007-04-23
Filing date: 2007-04-23
Publication date: 2008-10-30

Abstract

A digital camera and its system for watermark information acquiring via the external device are disclosed. The digital camera includes: the digital camera function model which trigged by the shutter button so that it can acquire the image data; the data requesting means which can send the information code instruction to the external device; the data acquiring means which can receiving the information from the external device; the data watermark adding model which adds the information code received from the external device to the image data taken by the digital camera function model in form of watermark. The solution achieves that receiving the necessary information into the digital camera and saving it in the image data by watermark, so that it can receive the useful files such as the position information, the identity information and the time of taking a photo of the autor.

Description

Digital camera for acquiring watermark information by external device and system thereof

The present invention relates to a digital camera that acquires watermark information by an external device and a system thereof and an external device, and more particularly to a digital watermark information acquired by an external device is received and added to a digital image through a receiving device built in the digital camera. Digital camera and its system with external devices.

Background technique

Digital cameras have become very popular due to the increasing image shield and the increasingly simplified desktop PC interface. Digital cameras are capable of taking digital images, allowing them to be transmitted or printed over the Internet to a color printer. Today, digital cameras have become a must-have item in our lives. Today, with the increasing popularity of digital technology, it is not difficult to modify and edit digital photos with various software. This has facilitated the tampering with the information recorded in digital photos, especially for some insurance, contracts, and electronic evidence. Photos such as notes, their authenticity is particularly important. Therefore, the problem of authenticity verification of digital photos is brought about. Our solution to this problem is through the photo-fidelity built into the digital camera.

Digital watermarking technology can effectively prevent digital images from being forged. Digital watermarking technology has two branches for different purposes: one is a robust watermark, which is used to protect the author's copyright, and is used to provide legal basis in the event of a copyright dispute; one is a fragile watermark (or semi-fragile watermark), It is used to detect whether a multimedia work has been maliciously altered or damaged. For Lu-bar watermarks, it must be robust enough that after the multimedia work has been attacked and tampered with, it can still be extracted correctly, in order to prove the author's copyright. The main purpose of the fragile watermark is to prove the authenticity of the multimedia work. Multimedia photos can't be used as evidence in court now, because multimedia photos can be easily used by various software (such as

Photoshop) is modified without any change; and any change in the medical image may cause the doctor to make a wrong judgment about the condition. Therefore, in these occasions, the authenticity of multimedia products is more important than copyright certification.

A digital camera with a watermarking device is disclosed in the prior art, please refer to the Chinese patent document "Digital Image Watermarking Method and Corresponding Device and Digital Camera with Watermark Addition" Application No.: 2005100556808, Application Date: March 2005 23 曰, wherein the digital camera comprises: means for obtaining a digital signal signal value, which reflects the optical image into a digital signal converted into an analog signal in the digital camera; and a bit dividing device that presses data of each pixel point in the digital image The bit is divided into a bit for calculating an image feature value, a bit of the hidden watermark, and a bit for locating the tamper region; and the device for initializing the tamper region is set to a fixed value of all the bits of the locating region of the positioning image; a value device that calculates a unique eigenvalue of the input digital signal based on the bit of the calculated image feature value described above And an encryption device that encrypts the calculated feature value by using a private key; the watermark embedding device embeds the encrypted feature value into the bit of the digital signal hidden watermark by using a fragile digital watermarking technique.

In addition, a "Method of ENABLING A WIRELESS INFORMATION DEVICE TO ACCESS LOCATION DATA" is proposed in the prior art, see U.S. Patent Application No.: 10/515, 870 Patent application, which discloses a method for acquiring position information of a camera without a positioning system, which uses a nearby mobile phone with a GPS device to acquire location information, and transmits the location information to the camera through Bluetooth transmission, The camera adds it as a watermark to the captured image. The above technique is a predictable implementation in this patent, but cannot be implemented according to what is described in the patent, and does not solve how the camera asks the mobile phone to send location information, how the camera loads the received location information. In the corresponding photo, how to make the position information acquired by the GPS function of the mobile phone and load the position information as a watermark avoids delays and the like.

As described above, in the prior art, the feature values of the watermark are obtained by calculating a unique digest of the digital image signal, which can enable the feature value to be correctly extracted or prove the authenticity of the work, however, The content of the watermark information is not perfect. For example, the personal ID information such as the author's location and the author's electronic signature are not included, but the information is widely used in many fields. At the same time, the digital camera itself cannot be used by the prior art. Obtaining more information, so that when the digital image works by adding a watermark to record hidden information, the hidden information is not complete, and the hidden information can not be widely used in daily life, social security and the like.

It can be seen that the above-mentioned existing digital camera with digital image watermark addition has obvious inconvenience and defects in structure and use, and needs to be further improved. In order to solve the problems of digital cameras with digital image watermarking, the relevant manufacturers do not bother to find a solution, but the design that has not been applied for a long time has been developed, and the general products have no suitable structure to solve. The above problems are obviously problems that the relevant industry is anxious to solve. Therefore, how to create a new digital camera that acquires watermark information through an external device and its system composed of external devices has become a goal that the industry needs to improve.

Summary of the invention

It is an object of the present invention to provide a novel digital camera that acquires watermark information through an external device and a system thereof and an external device. The technical problem to be solved is that the digital camera can be received by an external device through an internally set receiving device. The digital watermark information is loaded into the digital image captured by the digital camera, so that the image data can be safely hidden from useful information such as location information and user identity information. Another object of the present invention is to provide a novel digital camera that acquires watermark information through an external device and a system thereof and an external device. The technical problem to be solved is to enable an external device to receive an information code request command to obtain an information code. When it does not affect the digital camera to take the next picture.

The object of the present invention and solving the technical problems thereof are achieved by the following technical solutions. A digital camera according to the present invention, comprising: a digital camera function module, which is triggered by a shutter button to acquire image data; a communication interface for data transmission with an external device; and a data requesting device that can request an information code Sending to the external device through the communication interface; the data acquiring device is configured to acquire the information code sent by the external device through the communication interface; and the digital watermark loading module loads the information code received by the external device into the digital camera function module by watermarking In the image data.

The object of the present invention and solving the technical problems thereof can be further realized by the following technical measures.

The aforementioned digital camera further includes a triggering structure for triggering said data requesting means.

In the aforementioned digital camera, the trigger structure is a shutter button of a digital camera.

In the foregoing digital camera, the data requesting device and the digital camera function module or a part thereof are connected in parallel to the shutter button, thereby triggering the data requesting device to transmit information when the shutter button is triggered to trigger the digital camera function module. Code request instruction.

In the foregoing digital camera, the information code request instruction includes a code for identifying corresponding image data; the information code acquired by the data acquisition device includes the above code; the code camera further includes an association module, which establishes a code and an information code. One-to-one correspondence with the image data.

In the aforementioned digital camera, the code may be a file name automatically generated when the image data is captured, a time at the time of shooting, or a randomly generated code.

In the foregoing digital camera, the digital watermark loading module includes: an information code embedding device, receiving an information code received by the data acquiring device and image data converted by the device for acquiring a digital signal signal value, and embedding the information code into the image data a bit dividing device, configured to bitwise divide data of each pixel in the digital image embedded with the information code into bits for calculating image feature values and bits for hiding watermarks; and means for calculating feature values, the device is used for The bit in the data for calculating the image feature value calculates the unique feature value of the input digital signal; the watermark embedding device embeds the feature value into the bit of the digital signal hidden watermark.

In the aforementioned digital camera, the external device is a mobile phone or a PDA.

In the foregoing digital camera, the communication interface is a wired USB interface, a wireless USB interface, a Bluetooth interface, an infrared interface, a 1394 interface, or a radio frequency and FM interface.

In the foregoing digital camera, the information code is: positioning information obtained by a wireless communication network or a global satellite positioning system and/or system time of an external device, a device serial number, and stored identity information. In the foregoing digital camera, the digital watermark loading module may convert the information code into binary bits and embed the converted binary information code as watermark information into the image data, or convert the information code into a binary image and The information code in the form of the converted binary image is embedded in the image data.

In the aforementioned digital camera, the information code request command or information code is transmitted in the form of a text message or a message S.

The object of the present invention and solving the technical problems thereof are also achieved by the following technical solutions. A system for acquiring watermark information by using a mobile communication terminal according to the present invention is characterized in that the system is composed of a mobile communication terminal and a digital camera, wherein the digital camera comprises: a digital camera function module, triggered by a shutter button to acquire image data a communication interface for performing data transmission with an external device; a data requesting device transmitting an information code request instruction to the mobile communication terminal via the communication interface, the information code request instruction including a code for identifying corresponding image data; and the data acquisition device Obtaining, by the communication interface, the information code sent by the mobile communication terminal, the information code includes the above code, establishing a one-to-one correspondence between the information code and the image data; the digital watermark loading module, the watermark corresponding to the image data is watermarked Loading the data into the image data; the mobile communication terminal includes: a data transmitting device that transmits the information code to the data acquiring device, and a data request receiving device that receives the information code request command sent by the data requesting device, the mobile communication terminal according to Information Code Request The content requested by the instruction acquires the corresponding information code, and the information code contains the above code.

In the foregoing system, the data transmission mode of the communication interface and the external device includes a wired connection transmission, a wireless USB transmission, a Bluetooth or an infrared transmission.

In the foregoing system, the mobile communication terminal is a mobile phone or a PDA.

In the foregoing system, the information code is current location information acquired by the mobile communication terminal through the mobile communication server, and identity identification information of the mobile communication terminal user.

In the foregoing system, the mobile communication terminal transmits the information code to the digital camera in the form of a text message or an MMS.

As apparent from the above, the present invention relates to a digital camera that acquires watermark information by an external device and a system thereof. The digital camera comprises: a digital camera function module, which is triggered by a shutter button to acquire image data; a data requesting device, which can send an information code request instruction to an external device; and a data obtaining device, configured to acquire an information code sent by the external device a digital watermark loading module that loads the information code received by the external device into the image data captured by the digital camera function module in a watermark manner. The present invention realizes that necessary information is received into a digital camera and stored in the image data in the form of a watermark, so that useful information such as the photographer's position information, identity information, and shooting time can be recorded in real time. With the above technical solution, the digital camera of the present invention for acquiring watermark information by an external device and a system composed thereof with the external device have at least the following advantages:

1. The system for acquiring information code by an external device in the watermark information is based on a digital camera and an external device such as a mobile phone, a PDA, etc., thereby realizing receiving more necessary information into the digital camera and watermarking it. It is stored in the image data, so that the image data can record useful information such as the photographer's position information, identity information, and shooting time in real time;

2. The method for embedding watermark information of an external device into image data captured by a digital camera is simple and easy, and the information code of the embedded image can be inversely restored to the original recorded necessary information, thereby being suitable for each required image data. Use in real and comprehensive information.

The above description is only an overview of the technical solutions of the present invention, and the technical means of the present invention can be more clearly understood, and can be implemented in accordance with the contents of the specification, and the above and other objects, features and advantages of the present invention can be made more obvious. In the following, the preferred embodiments are described in detail below with reference to the accompanying drawings.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the configuration of a system for acquiring watermark information by an external device of the present invention.

2 is a schematic diagram showing the internal structure of a digital camera capable of receiving watermark information according to the present invention. Fig. 3 is a flow chart showing a method of embedding watermark information in image data of a digital camera of the present invention.

detailed description

In order to further explain the technical means and efficacy of the present invention for achieving the intended purpose of the invention, the system for acquiring watermark information by an external device and the embedding and authentication method according to the present invention are specifically described below with reference to the accompanying drawings and preferred embodiments. The implementation, structure, steps, features and functions are described in detail below.

The system for acquiring watermark information by an external device of the present invention mainly uses the useful information in the external device to transmit to the digital camera in the form of information code, and uses the information code as the watermark information to be embedded in the image or video data before imaging, thereby The image or video data captured by the mobile communication terminal provides accurate and valid authentication information.

Please refer to FIG. 1 , which is a schematic structural diagram of a system for acquiring information code embedded in watermark information by an external device according to the present invention, including a digital camera and an external device. Wherein, the digital camera capable of receiving the information code is used in combination with an external device, which is only a preferred embodiment of the present invention, and can also be used alone. The digital camera having the data acquiring device for receiving digital watermark information includes: a digital camera function module, It can convert image information acquired by the optical system into image data and output; communication interface for data transmission with an external device; data request device, which is triggered by a shutter button of the digital camera, outward through the communication interface The device sends an information code request instruction of the request information code; the data acquisition device acquires the information code sent by the external device through the communication interface; and the digital watermark loading module loads the information code received by the external device into the digital camera function module. In the image data, the storage module receives and stores the image data embedded with the digital watermark, and the storage module may be a storage medium such as a memory or a memory card.

The information code request instruction is different according to the content of the information code requested by the operator, and the required information code content may be selected by the operator, and the information code request instruction is generated according to the requested information code content, and the instruction content may be Stored in the storage media shield. The digital camera includes a trigger data requesting device triggering structure, the triggering structure is a shutter switch as a main switch of the digital camera function module and the data requesting device; or the circuit of the data requesting device is connected in parallel with the digital camera function module or a part thereof Connected together to trigger the data requesting device to transmit an information code request command when the shutter button is pressed to trigger the digital camera function module.

Referring to FIG. 2, it is a schematic structural diagram of a digital camera having a receiving device for receiving digital watermark information according to the present invention. As shown in the figure, the digital camera function module includes: means for acquiring a digital signal signal value, the device is used for reading The value of the digital signal is taken out, which is a digital signal converted from an optical signal into an analog signal in the digital camera.

The digital watermark loading module includes: an information code embedding device, receiving an information code received by the data acquiring device and image data converted by the device for acquiring the digital signal signal value, and embedding the information code in the image data; The data of each pixel in the digital image embedded with the information code is bitwise divided into bits for calculating image feature values and bits for hiding watermarks; means for calculating feature values, the device is for calculating image feature values according to image data The bit calculates the unique eigenvalue of the input digital signal; the watermark embedding device embeds the eigenvalue into the bit of the digital signal hidden watermark.

The above external device includes various devices capable of data processing, such as a mobile phone, a PDA, etc., and the data acquiring device includes a communication interface for data transmission with an external device, the communication interface is a wired USB interface, a wireless USB interface, and a Bluetooth. Interface, infrared interface, 1394 interface or RF, FM interface. The information code request command or the information code can also be transmitted by means of text message or 匪 S (MMS).

In addition, the information code acquired by the external device may be information such as a fingerprint image acquired from the fingerprint sensor, an electronic signature obtained by the handwriting input function, or the positioning information obtained through the wireless communication network or the global satellite positioning system, or may be external The system time of the device, the device serial number, the stored identity information, and so on.

In detail, the external device is provided with a data request receiving device for receiving an information code request command sent by the data requesting device set in the digital camera, and a data transmitting device, wherein the data transmitting device can pass the above The data transmission method and the digital camera data acquisition device perform data transmission.

The external device can obtain the corresponding content according to the information code request instruction described above. The information code is sent to the data transmitting device so that the digital camera can receive it through the data acquiring device.

When the external device is a mobile communication terminal, the information code of the mobile communication terminal may be information stored or recorded in the SIM card. The indication information in the SIM card includes: International Mobile Registration Identity Information (IMSI), which includes a telecommunication country number, a mobile network number, a number of the mobile communication terminal in the mobile network, a temporary mobile registration identity information (TMSI), and a mobile Network location area information (LAI); phone number, short message, etc. Since there is more indication information in the SIM card, it is preferable to read only the international mobile registration identity information and the mobile network location area information in the SIM card as the information code. In addition, in order to obtain the indication information in the SIM card, a SIM card information reading module may be disposed in the mobile communication terminal or the digital camera, and the label information in the SIM card is read by the module and sent to the data transmitting device.

Specifically, when the external device is a mobile communication terminal, the mobile communication terminal can access the mobile communication network used by the gateway GPRS support node (GGSN), and can record the mobile communication terminal through the serving GPRS support node (SGSN). Current location information. In addition, information such as current location information acquired by the mobile communication server may be sent to the mobile communication terminal by means of text message or MMS (MMS), and the mobile communication terminal receiving the above information may send the received text message or 匪S (MMS) and other information are sent directly as data and received by the digital camera's data acquisition device.

According to the above, since the information code output by the receiving server processing module may occupy more data length, if necessary, the information code may be entropy encoded or the like by the external device to reduce the length of the information.

In addition, the data acquisition device may receive stable information (eg, identity information, date in system time, area range information in the positioning information, and the like) from the external device to the digital camera before shooting, and the information in the form of stable information The transmission of the code can be initiated by the external device, and the digital camera can automatically receive after receiving the stable information, and can also set whether to receive, or can be set to perform information code transmission only with the specified external device. In addition, the digital camera can also request the stable information in the external device by the data requesting device at the time of non-shooting, and cause the external device to automatically or passively transmit the information code containing the stable information to the data acquiring device. Further, according to the above configuration, when the stability information is changed (for example, the date is changed), the data transmitting apparatus of the external device actively transmits the new information code to the data acquiring apparatus provided in the digital camera, and the data acquiring apparatus can automatically or via The user receives the information code upon confirmation.

In order to avoid the delay caused when the information is acquired by using the mobile communication network, the digital camera of the present invention further includes an association module, which establishes a correspondence relationship between the information code request instruction, the information code and the image data, and the association module is configured by Both hardware and software can be implemented. When the digital camera function module and the data requesting device are triggered by the shutter button, a code is generated, and the code is matched with the information code request command and the captured image data respectively, according to the letter The code matched by the code request instruction identifies the image data corresponding thereto, and then the information requesting device transmits the information code request instruction to the external device, and stores the captured image data in the storage medium. After the external device acquires the corresponding information code according to the information code request instruction, the information code is matched with the code in the corresponding information code request instruction, that is, the information code and the information code request instruction can be in accordance with the code included therein. The corresponding image data is recognized, and the information code is sent to the data acquisition device of the digital camera, and the information code is embedded in the corresponding image data according to the matched code. According to the above manner, when the user needs to continuously capture a plurality of pictures, the previously captured image data is already stored in the storage medium, so that the above delay is not generated and the chance of shooting at a critical time is missed, and the The delay caused by the network limits the continuous use of digital cameras. The above code may be a file name automatically generated when image data is captured, a time at the time of shooting, or a randomly generated code. The matching of the above code with the information code request instruction and the image data may be a file name or a label using the code as the file (ie, the information code request instruction and the information code), or may be a code package and the file together to generate a file package. The software may also be used to associate the code with the data of the file, or by inserting the code into a specific position of the file, thereby finally making a one-to-one correspondence between the information code request command, the information code, and the image data.

Referring to FIG. 3, a method for embedding digital watermark information received by a receiving device into image data according to the present invention is to embed a watermark into image data by using a digital camera having the above structure, the method comprising the following steps:

In the first step, press the shutter button to activate the digital camera function module set in the digital camera to capture the optical image. After the image signal passes through the optical system and CCD or CMOS, digital signal processing is performed on the image signal and processed. Image data output, in addition, when the shutter button is pressed, the data request device is also activated, and the data request device sends an information code request command to the external device;

In the second step, the external device can obtain the corresponding information code according to the content requested by the information code request instruction, and send the information code to the data transmitting device, so that the digital camera can receive the data through the data acquiring device.

The third step is: receiving, by the data acquiring device, the information code sent by the external device, and loading the information code into the image data captured by the digital camera function module by using the digital watermark loading module, specifically, the data of the information code Converted to an ASCII 01-bit string, and then hidden to the next lower order of the image data, thereby embedding the specified position of the image data;

In the fourth step, the processed image data is subjected to a digital watermark loading operation (ie, a secondary watermark loading step), for example, dividing the bit, calculating the image feature value, and embedding the feature value into the designated bit bit by bit, and storing the watermarked image data. To the storage module.

Wherein, in the step of embedding the information code in the image data in the third step, the information code may be first converted into a binary bit and embedded into the image data using the converted binary as a watermark, and may also be converted into, for example, 30 X A binary image of 40 pixels (ie, width by height) is embedded into In the image data, wherein the binary image is a black and white image composed of 0, 1. When the binary image is embedded in the image data, the width and height of the binary image can be recorded in a fixed bit in the bit of the hidden information code (for example, the bit occupied by the first bit of the bit of the hidden information code, the last bit record) High-occupied bits), and embedding the binary image sequentially in the bits of other hidden information codes. When extracting the binary image, the width and height can be read first, so that the number of bits of the binary image can be determined. And then read out the values of the digits in sequence. Because the content of the information code and the occupied data space are different, for example, the bits occupied by the electronic signature or the fingerprint information cannot be determined, so the bits occupied by the information code are different, and thus the bits occupied by the hidden information code can be fixed, and The bit of the limited information code does not exceed the bit occupied by the hidden information code. When the bit occupied by the information code is less than the bit of the hidden watermark, the bit not embedded with the information code may not be changed. Further, when the information code is embedded in the image data in binary, the bit occupied by the information code may be recorded in a wide manner in the same manner as above, and the position 0 of the record high may be set to 1.

The above digital watermark loading module can be implemented by hardware or by software, and the algorithm for embedding watermark can be consistent with the digital watermark loading algorithm for image or video on a computer in the prior art.

When the digital camera user receives the image data in some manner, it can verify the copyright information of the image data, and can also extract various information hidden in the digital watermark, and the image data of the digital watermark loaded image is authenticated. The process may include: a step of verifying whether the image data has been tampered with; if not falsified, extracting the information code embedded in the image data according to the specified position of the embedded watermark information; decoding the information code, and outputting the displayed step.

Specifically, the step of the digital watermark verification and information code extraction of the image data of the digital camera of the present invention may further include: a step of confirming the identity of the authenticator, the step may be to confirm the password after the authentication step is started, or In order to confirm the image data without being tampered with, the password is confirmed, thereby preventing unnecessary output of the information code and protecting the copyright owner's personal information. In addition, when the information code includes identity information such as a SIM card number and a mobile phone serial number, the identity information may be embedded in a specific location of the image data, and in the authentication process, the identity information embedded in the specific location is first extracted, and The identity information is compared with the identity information of the user at the time of authentication. If they are consistent, the information code is extracted and displayed. If the identity is inconsistent, the password can be confirmed. The above authentication process may also incorporate the step of locating the corrupted tamper region in the image data. The step of extracting the digital watermark information of the image by the digital camera of the present invention is the same as the algorithm for embedding the watermark information, which can be known to those skilled in the art, and will not be described again.

In the above preferred embodiment, the image data captured by the digital camera is embedded in the watermark. However, the digital camera function module can be replaced with a digital camera, a digital recorder, or the like, and the same can be obtained by the above structure and method. The information code is loaded into the multimedia data with watermark information.

The above description is only a preferred embodiment of the present invention, and is not intended to be a The present invention has been disclosed in the above preferred embodiments, but is not intended to limit the present invention. Any one skilled in the art can utilize the methods disclosed above without departing from the scope of the present invention. And the technical content makes a slight change or modification to the equivalent of the equivalent, the embodiment, but it is still within the scope of the technical solution of the present invention without departing from the contents of the technical solution and modification.

Claims

Claim

1. A digital camera, characterized in that it comprises:

The digital camera function module is triggered by the shutter button to acquire image data; the communication interface is used for data transmission with an external device;

The data requesting device may send the information code request instruction to the external device through the communication interface;

And a data acquiring device, configured to acquire an information code sent by the external device through the communication interface; and a digital watermark loading module that loads the information code received by the external device into the image data captured by the digital camera function module by watermarking.

2. The digital camera of claim 1 further comprising a triggering structure for triggering said data requesting means.

3. A digital camera according to claim 1 wherein said triggering structure is a shutter button of a digital camera.

4. The digital camera according to claim 3, wherein said data requesting means and said digital camera function module or a part thereof are connected in parallel to said shutter key, thereby triggering a digital camera by pressing a shutter button. The function module also triggers the data requesting device to transmit an information code request command.

5. The digital camera according to claim 1, wherein said information code request instruction includes a code for identifying corresponding image data; and the information code acquired by said data acquisition means includes said code; said digital camera further comprising The association module establishes a one-to-one correspondence between the code, the information code and the image data.

6. The digital camera according to claim 5, wherein the code is a file name automatically generated when the image data is captured, a time at the time of shooting, or a randomly generated code.

7. The digital camera according to claim 1, wherein said digital watermark loading module comprises: an information code embedding device, which receives an information code received by the data acquiring device and is converted by means for acquiring a digital signal signal value. Image data, and embedding the information code in the image data; the bit dividing device is configured to divide the data of each pixel in the digital image embedded with the information code into bits for calculating the image feature value and the bit of the hidden watermark; a device for calculating a unique feature value of the input digital signal based on the bit of the image feature value calculated in the image data; the watermark embedding device embedding the feature value into the bit of the digital signal hidden watermark.

8. A digital camera according to claim 1, wherein said external device is a mobile phone or a PM.

9. The digital camera according to claim 1, wherein the communication interface is a wired USB interface, a wireless USB interface, a Bluetooth interface, an infrared interface, a 1394 interface, or a radio frequency, FM interface.

10. The digital camera according to claim 1, wherein said information code is: positioning information obtained by a wireless communication network or a global satellite positioning system and/or system time of an external device, device serial number, stored Identity Information.

11. The digital camera according to claim 1, wherein said digital watermark loading module converts the information code into binary bits and embeds the converted binary information code as watermark information into the image data, or The information code is converted into a binary image and the information code in the form of the converted binary image is embedded in the image data.

A digital camera according to claim 1, wherein said information code request command or information code is transmitted in the form of a text message or a solid S.

13. The method of embedding watermark information in image data of a digital camera according to claim 1, comprising the steps of:

In the first step, pressing the shutter button to activate the digital camera function module set in the digital camera, and simultaneously starting the data requesting device, the data requesting device transmitting the information code requesting instruction to the external device;

In the second step, the external device acquires the information code corresponding to the content requested by the information code request instruction, and sends the information code to the data transmitting device.

The third step is: receiving, by the data acquiring device, the information code sent by the external device, and loading the information code into the image data captured by the digital camera function module by using the digital watermark loading module;

In the fourth step, the processed image data is subjected to a digital watermark loading operation for dividing the bit, calculating the image feature value and embedding the feature value bit into the designated bit, and storing the watermarked image data into the storage module.

14. The method of embedding watermark information for image data of a digital camera according to claim 13, wherein said second step is converting data of the information code into a 01 bit string of ASCI I, and then hiding the image data. The second lowest bit, thereby embedding the specified position of the image data.

15. The method of embedding watermark information in image data of a digital camera according to claim 13, wherein in the step of embedding the information code in the image data in the third step, the information code can be first converted into a binary bit. And using the converted binary as a watermark embedded in the image data, it can also be converted into a binary image embedded into the image data.

16. A method of embedding watermark information in image data of a digital camera according to claim 15, wherein said binary image is a black and white image composed of 0, 1.

A system for acquiring watermark information by using a mobile communication terminal, characterized in that the system is composed of a mobile communication terminal and a digital camera, wherein

Digital cameras include:

The digital camera function module is triggered by a shutter button to acquire image data;

a communication interface for performing data transmission with an external device;

a data requesting device that transmits an information code request to a mobile communication terminal through a communication interface An instruction, the information code request instruction includes a code for identifying corresponding image data; and a data acquisition device that acquires an information code sent by the mobile communication terminal through the communication interface, the information code includes the code, and establishes one of the information code and the image data. a correspondence relationship; a digital watermark loading module that loads an information code corresponding to the image data into the image data in a watermark manner;

The mobile communication terminal includes: a data transmitting device that transmits an information code to the data acquiring device, and a data request receiving device that receives an information code request command transmitted by the data requesting device, the mobile communication terminal acquiring the content requested according to the information code requesting instruction Corresponding information code, and the code contains the above code.

18. The system according to claim 17, wherein the data transmission mode of the communication interface and the external device comprises a wired connection transmission, a wireless USB transmission, a Bluetooth or an infrared transmission.

19. System according to claim 17, characterized in that said mobile communication terminal is a mobile telephone or a PDA.

The system according to claim 17, wherein said information code is current location information acquired by the mobile communication terminal through the mobile communication server, and identity identification information of the mobile communication terminal user.

The system according to claim 17, wherein said mobile communication terminal transmits the information code to the digital camera in the form of a text message or a message.