KR100835372B1 - Apparatus and method for providing an image photographed by network cameras - Google Patents

Abstract

The present invention relates to an apparatus and method for providing a network camera photographed image, and more particularly, to encrypting a photographed image of a predetermined public network camera according to a user's request, and providing the encrypted image data to a user terminal through a wired / wireless communication network. An apparatus and method for According to the present invention, by using a user terminal connected through a network camera and a wired or wireless communication network to allow a plurality of users to use the camera photographed image, the user can easily track and monitor any desired monitoring object anytime, anywhere, In addition, it is possible to maintain the security of the video data by applying a predetermined encryption algorithm to the transmitted and received video data.

Network Camera, Video Data, Encryption, User Terminal, Communication Network

Description

Apparatus and method for providing a network camera photographing image {APPARATUS AND METHOD FOR PROVIDING AN IMAGE PHOTOGRAPHED BY NETWORK CAMERAS}

1 is a diagram illustrating a network configuration of a network camera photographed image providing system according to an exemplary embodiment of the present invention.

2 is a block diagram illustrating an internal configuration of a network camera according to an embodiment of the present invention.

3 is a block diagram illustrating an internal configuration of a network camera management server according to an embodiment of the present invention.

4 is a block diagram illustrating an internal configuration of a user terminal according to an embodiment of the present invention.

5 is a block diagram illustrating an internal configuration of an encryption module of a network camera according to an embodiment of the present invention.

6 is a diagram illustrating an example of dividing image frame data using an encryption code according to an embodiment of the present invention.

7 is a diagram illustrating an example of encrypting image data according to an embodiment of the present invention.

8 is a flowchart illustrating a network camera photographed image providing method according to the present invention.

9 is a flowchart illustrating a method of providing a network camera captured image using a network camera management server according to the present invention.

<Description of the symbols for the main parts of the drawings>

201: video recording unit

202: image transmission request receiving unit

203: encryption module

204: video transmission unit

The present invention relates to an apparatus and method for providing a network camera photographed image, and more particularly, to encrypting a photographed image of a predetermined network camera according to a user's request, and providing the encrypted image data to a user terminal using a wired / wireless communication network. An apparatus and method are provided.

Recently, various crimes are rampant, and the number of crime prevention and security systems have been increasing in individuals as well as in corporations. In particular, security systems using surveillance cameras are developing day by day for the safety of individuals and society.

With the recent development of digital imaging technology, such surveillance cameras have been able to achieve high performance, high definition, and miniaturization, such as internal surveillance devices such as banks, factories or supermarkets, public buildings and traffic control, and large apartments. It is widely used as an external monitoring device. In addition, there has been an increase in the installation of surveillance cameras in places where individuals need them for personal use.

However, if many people install and use surveillance cameras directly for personal use, managing a large number of installed surveillance cameras becomes more difficult and inefficient in terms of cost and effectiveness. In addition, when an individual installs a surveillance camera for the purpose of external surveillance, there is a problem that the cost of the track construction is too expensive for the individual to bear.

On the other hand, in the modern society, mobile communication terminals (user terminals) are widely used as necessities for modern people as a means for convenient communication regardless of place. However, in recent years, as the performance of the processor is improved and the resources of the memory are increased, the mobile communication terminal provides various functions as well as the conventional mobile communication service. Therefore, it would be very useful if the surveillance camera was wirelessly installed and the user could be provided with the captured image of the desired surveillance camera remotely using the mobile communication terminal.

However, wireless cameras are much more expensive than wired cameras and can easily expose video data to others. In addition, when a special encryption algorithm is used, a high-performance system is required for the encryption and decryption processing, so there is a limit in receiving a camera photographed image from a mobile communication terminal.

Accordingly, the present invention solves the problem of the conventional method for providing the captured image of the surveillance camera, and networked a plurality of surveillance cameras to provide the user terminal using the wired or wireless communication network to the captured image of the public network camera at the user's request The present invention proposes a new device and method. In addition, the present invention proposes a simple and efficient encryption algorithm suitable for a user terminal as a method for encrypting image data.

The present invention has been made to solve the problems of the prior art as described above, by allowing a plurality of users to easily receive the captured image of the desired network camera using the user terminal, when the desired monitoring targets at a low cost Its purpose is to make it easy to track and monitor anywhere.

Another object of the present invention is to encrypt the image data by using an encryption algorithm, to prevent invasion of privacy or security incidents that may occur due to joint use of network cameras.

Another object of the present invention is a method of encrypting video data, and by using a simple encryption algorithm based on an encryption code temporarily generated according to a user's video request, the purpose is to encrypt video data simply and efficiently. It is done.

Still another object of the present invention is to add a user authentication process at a predetermined network camera management server or to store a network camera usage record, thereby preventing the network camera photographed image from being used for an impure purpose.

In order to achieve the above object and to solve the above-mentioned problems of the prior art, a network camera connected to at least one or more user terminals according to the present invention through a predetermined communication network is configured to capture an image to generate image frame data. An image transmission request receiver for receiving image transmission request information including terminal identification information from a user terminal, an encryption module configured to generate image packet data by encrypting the image frame data using a predetermined encryption code, and the terminal identification information And an image transmitter for transmitting the image packet data to the user terminal.

In addition, a network camera management server for providing an image photographed through a communication network connected to a plurality of network cameras to a user terminal according to the present invention is an image transmission request receiving unit for receiving image transmission request information from the user terminal-the image transmission request The information includes terminal identification information and camera identification information. An image packet data receiver for receiving encrypted image packet data from a corresponding network camera with reference to the camera identification information, and the terminal identification information with reference to the terminal identification information. And an image packet data transmission unit for transmitting the image packet data to a user terminal.

In addition, the method for providing a network camera photographed image to at least one user terminal according to the present invention comprises the steps of photographing the image to generate image frame data, receiving image transmission request information including the terminal identification information from the user terminal The method may include: generating image packet data by encrypting the image frame data using a predetermined encryption code, and transmitting the image packet data to the user terminal with reference to the terminal identification information. It is done.

For reference, the term "user terminal" herein refers to a PDC (Personal Digital Cellular) phone, a PCS (Personal Communication Service) phone, a PHS (Personal Handyphone System) phone, a CDMA-2000 (1X, 3X) phone, WCDMA (Wideband) CDMA phone, Dual Band / Dual Mode phone, Global Standard for Mobile (GSM) phone, Mobile Broadband System (MBS) phone, Digital Multimedia Broadcasting (DMB) phone, Smart phone, Mobile phone Handheld devices that may include communication functions such as personal digital assistants (PDAs), handheld PCs such as hand-held PCs, WiBro terminals, and extended roaming services with international roaming services. A portable electric and electronic device, which means all kinds of handheld-based wireless communication devices, including an IMT-2000 (International Mobile Telecommunication-2000) terminal that provides a service, and includes a Code Division Multiplexing Access (CDMA) module and a Bluetooth device. A) module, infrared tong It can be equipped with a predetermined communication module such as a wireless communication device equipped with a GPS chip to enable location tracking through a new module (Infrared Data Association), a wired / wireless LAN card, and a global positioning system (GPS). It is interpreted as a concept of collectively a terminal capable of performing a certain arithmetic operation by mounting a microprocessor.

In addition, a "user terminal" may receive an image through a wired communication network such as a TCP / IP-based communication network, an optical communication network, or a cable communication network such as a network terminal such as a notebook computer or a PC, and output the received image to the user. It can be broadly interpreted to include all other wired and electronic devices including display means.

Hereinafter, a network camera photographing image providing apparatus and method will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a network configuration of a network camera photographed image providing system according to an exemplary embodiment of the present invention. As shown in the drawing, the network camera photographed image providing system includes a network camera 101, a network camera management server 102, and a user terminal 103.

The network camera 101 may include a digital video recorder (DVR), a closed circuit television (CCTV), or a web cap, and may be located in an alley, a road, a parking lot, or a building. Can be installed on In addition, if you want to monitor the elderly or children can be installed in various places depending on the purpose.

The network camera management server 102 is connected to one or more network cameras 101 through a predetermined communication network, and transmits image data captured by the network camera 101 to one or more user terminals 103 using a predetermined communication network. send. The communication network may be a wired communication network such as an Integrated Services Digital Network (ISDN), an Asymmetric Digital Subscriber Line (ADSL), a TCP / IP-based communication network, or an optical communication network, and alternatively, Wideband Code Division Multiple Access (WCDMA), WLAN ( Wireless LANs, High Speed Downlink Packet Access (HSDPA), and Wireless Broadband Internet (WiBro). Also, it may be a short range wireless communication network such as infrared data association (IrDA), Bluetooth, Ultra Wide Band (UWB), and Zigbee.

The user terminal 103 includes a communication module for wired / wireless communication or short-range communication, and can receive and output image data, a personal computer, a DTV equipped with a set-top box, or a portable multimedia player (PMP). And the like.

As an embodiment of the present invention, the network camera management server 102 may receive image data from the network camera 101 and transmit the image data to the user terminal 103. In this case, the network camera management server 102 may store and manage a user authentication process and details of image data transmission and reception.

As another embodiment of the present invention, the network camera management server 102 may be omitted, and direct communication between the network camera 101 and the user terminal 103 may be used to directly transmit and receive image data.

2 is a block diagram illustrating an internal configuration of a network camera 101 according to an embodiment of the present invention. As shown in the figure, the network camera 101 includes an image capturing unit 201, an image transmitting request receiving unit 202, an encryption module 203, and an image transmitting unit 204. The apparatus may further include an image frame storage memory that can be temporarily stored, a communication control module that can control an associated communication connection, a resolution image compression unit that can compress an encrypted or decomposed image, and a controller.

The image capturing unit 201 generates image frame data by capturing a predetermined external image. As an example of generating the image frame data, when the image capturing unit 201 uses an image sensor such as a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS), the image is captured from the outside. One image signal is converted into an electrical signal including luminance information or color information through a predetermined signal processing process, and the electrical signal is generated as image frame data in the form of digital data.

The image transmission request receiver 202 receives image transmission request information including terminal identification information from the user terminal 103. In addition, according to the present invention, the image transmission request information includes at least one network camera identification information. The terminal identification information is used as a terminal identifier for receiving a requested image, and the network camera identification information is used as a camera identifier for receiving a captured image of a network camera installed at a desired place.

As an example in which the user inputs network camera identification information, a predetermined network camera location map including a plurality of network camera locations and identification numbers is pre-stored in the user terminal 103, and the user desires using the network camera map. The camera of the position can be easily selected. In addition, when the user selects a plurality of network cameras, the image data may be sequentially received from the corresponding network cameras according to the selection order.

The encryption module 203 generates the image packet data by encrypting the image frame data using a predetermined encryption code. According to the present invention, the encryption code is temporarily generated according to the user's video transmission request, and automatically deleted when the transmission of the video packet data is completed.

As an embodiment of the present invention, the encryption code is temporarily generated together with the image transmission request information in the user terminal 103 and transmitted to the network camera 101. In this case, the user terminal 103 may decrypt the video packet data by using the generated encryption code.

As another embodiment of the present invention, the encryption code is generated by the encryption module 203 of the network camera, and the image transmission unit 204 transmits the encryption code to the user terminal together with the image packet data. . In this case, the user terminal 103 may decrypt the image packet data by using the received encryption code.

The encryption module 203 encrypts the image frame data using a predetermined encryption code, which will be described later with reference to FIGS. 5 to 7.

The image transmitter 204 transmits the image packet data generated by the encryption module 203 to the corresponding user terminal by referring to the terminal identification information included in the image transmission request information received by the image transmission request receiver 202. .

The terminal identification information is terminal-specific information such as a mobile identification number (MIN) or a terminal serial number (ESN: Electronic Serial Number). The video packet data is transmitted to the user terminal 103 corresponding to the terminal identification information through a communication network.

In an example in which the user uses the network camera 101, the user may use the network camera 101 to monitor a desired place or track a desired object. For example, when a user goes out leaving only children in the house, the user may frequently check the house situation from a network camera installed in the house using a user terminal such as a PDA from the outside. In addition, when a woman returns home at a late time, she may prepare for a crime that may occur by directly tracking and checking a woman's return situation from a network camera installed in an alley using a user terminal such as a computer at home.

3 is a block diagram illustrating an internal configuration of the network camera management server 102 according to an embodiment of the present invention. As shown in the figure, the network camera management server 102 includes an image transmission request receiver 301, an image packet data receiver 302, an image packet data transmitter 303, a user authentication unit 304, and a usage history. In addition to the storage unit 305, the image request unit for requesting an image to the corresponding network camera according to the image request of the user terminal 103, a camera position DB for storing the camera position information, and a plurality of network cameras It further comprises a camera management unit for managing and maintaining.

The image transmission request receiver 301 receives image transmission request information including terminal identification information and camera identification information from the user terminal 103. The image packet data receiver 302 receives encrypted image packet data from a corresponding network camera with reference to the camera identification information. That is, the image packet data receiving unit 302 connects to a specific network camera designated by a user among a plurality of network cameras, requests image data, and receives encrypted image packet data. The video packet data transmitter 303 transmits the video packet data to the corresponding user terminal 103 with reference to the terminal identification information.

The user authentication unit 304 receives user identification information from the user terminal 103 and performs user authentication based on the user identification information. According to the present invention, before using the user's network camera, by adding a user authentication process in the user authentication unit 304, it is possible to limit the authorized user according to the network camera to a part, where outsiders need to maintain security network Connection to the camera can be prevented from arbitrarily receiving image data.

The usage history storage unit 305 stores the image transmission request details or the image packet data transmission details in association with the user terminal 103. In preparation for a privacy infringement or a security incident that may occur while a plurality of users jointly use the network camera, the present invention stores the data data transmission / reception using the network camera in the use history storage unit 305 and subsequently generates the data. Be prepared for security incidents.

4 is a block diagram illustrating an internal configuration of a user terminal 103 according to an embodiment of the present invention. As shown in the figure, the user terminal 103 includes an image transmission request transmitter 401, an image receiver 402, a decoding module 403, and an image output unit 404, and also includes a keypad or a keyboard. It further comprises a random encryption generating module for generating an input means and encryption code, such as.

The image transmission request transmitter 401 transmits image transmission request information including an encryption code to the network camera 101. For example, when a user designates a specific network camera 101 to be received by using a keypad of the user terminal and requests an image transmission, the image transmission request transmitter 401 generates a random random encryption code. Image transmission request information is transmitted to a specific network camera 101 together with the encryption code.

The image receiver 402 receives encrypted image packet data from the corresponding network camera 101 according to the image transmission request information. That is, the image receiving unit 402 receives the image packet data generated by the network camera 101 using the encryption code in response to the image transmission request from the image transmission request transmitting unit 401.

The decryption module 403 decrypts the video packet data received by the video receiver 402 using the encryption code to generate video frame data. That is, the decryption module 403 decrypts the image packet data again and generates the image frame data by using the encryption code previously generated together with the image transmission request in the image transmission request transmitter 401.

The image output unit 404 outputs image frame data generated by the decoding module 403. That is, the image output unit 404 outputs the decoded image frame data to the user using a display module such as an LCD.

The temporary key (encryption code) based encryption method used in the present invention is simple and thorough security because it is impossible to decrypt the image packet data without knowing the key (encryption code) value known only to the user terminal and the network camera.

5 is a block diagram illustrating an internal configuration of an encryption module 203 of a network camera 101 according to an embodiment of the present invention. The encryption module 203 for encrypting the image data includes an image divider 501 and a random number generator 502. The image divider 501 generates a plurality of image packet data by dividing the image frame data. The random number generator 502 generates a predetermined random number by using serial numbers of the plurality of video packet data and the encryption code. The generated image packet data and the random number are transmitted to the user terminal 103 through a predetermined communication network.

6 is a diagram illustrating an example of dividing image frame data by using an encryption code in the image divider 501, and FIG. 7 is an image data encryption process by the image divider 501 and the random number generator 502. It is a figure which shows an example of this.

Hereinafter, a specific example of an image data encryption algorithm according to the present invention will be described in detail with reference to FIGS. 6 to 7.

For example, when two encryption codes A (3) and B (4) are generated and transmitted to the network camera as a temporary encryption code by the user terminal, the network camera divides the captured image frames into 3 * 4 pieces and arranges the array C. Are stored at random (reference numeral 701), and the serial numbers of the divided video frames are stored in the array D. After that, array C is stored in a predetermined packet, the serial number stored in the array element of array D is multiplied by A (3), and B (4) is added to a random number value (drawing symbol 702) in the header of the packet. And generates predetermined video packet data (reference numeral 703). Even if the encrypted video packet data is leaked during the transmission process, randomly mixed video data must be combined, and in order to know the serial number of the video frame for combining the video data, the encryption code must be known. It is virtually impossible.

In the user terminal, B (4) is subtracted from the random number value of the received packet header, and is divided into A (3) and arranged again using the encryption codes A (3) and B (4) as the reverse of the calculation process of the network camera. Calculate the element's serial number Then, the image fragment is extracted from the corresponding array element of array C according to the serial number to complete the original image frame.

In the present embodiment, two ciphers representing the number of matrixes of the video frame are used as the encryption code, but any other combination of cipher forms that can be used as a reference for dividing the video frame can be used as the encryption code. In addition, a mathematical expression for encrypting a serial number of an image frame using the encryption code may be other mathematical operations other than the operations (multiplication and subtraction) illustrated in this embodiment.

8 is a flowchart illustrating a network camera photographed image providing method according to the present invention.

In operation S801, an external image is captured to generate image frame data. For example, in this step, an image signal photographed from the outside using a predetermined image sensor is converted into an electrical signal including luminance information or color information through a predetermined signal processing process, and the electrical signal is converted into an image in the form of digital data. Generated by frame data.

In operation S802, image transmission request information including terminal identification information and network camera identification information is received from the user terminal. The terminal identification information is used as an identifier for receiving a requested image, and the network camera identification information is used as an identifier for receiving a captured image of a network camera installed at a desired place.

As an example of inputting terminal identification information by a user, a predetermined network camera location map including a plurality of network camera locations and identification numbers is pre-stored in the user terminal, and the user may select a camera of a desired location using the network camera map. It can be selected easily. In addition, when the user selects a plurality of network cameras, the image data may be sequentially received from the corresponding network cameras according to the selection order.

In step S803, the image frame data generated in step S801 is encrypted by using a predetermined encryption code to generate image packet data. According to the present invention, the encryption code is temporarily generated according to a user's video request, and is automatically deleted when the transmission of the video packet data is completed. By doing so, it is possible to prevent a security incident due to leakage of the encryption code.

As an embodiment of generating the encryption code, the encryption code is temporarily generated together with the image transmission request information in the user terminal and transmitted to the network camera. In this case, the user terminal may decrypt the image packet data by using the generated encryption code. In another embodiment, the encryption code is generated by an encryption module of a network camera, and the encryption code is transmitted to the user terminal along with the image packet data. In this case, the user terminal may decrypt the image packet data by using the received encryption code.

As a specific example of generating image packet data, when the user terminal generates two cipher codes A (3) and B (4) as temporary encryption codes and transmits them to the network camera, the network camera records three captured image frames. It is divided into four and randomly stored in the array C, and the serial number of the divided video frame is stored in the array D. Thereafter, array C is stored in a predetermined packet, the serial number stored in the array element of array D is multiplied by A (3), and the random number value obtained by adding B (4) is stored in the header of the packet to store predetermined video packet data. Create Even if the encrypted video packet data is leaked during the transmission process, randomly mixed video data must be combined, and in order to know the serial number of the video frame for combining the video data, the encryption code must be known. It is virtually impossible.

In the user terminal, B (4) is subtracted from the random number value of the received packet header, and is divided into A (3) and arranged again using the encryption codes A (3) and B (4) as the reverse of the calculation process of the network camera. The serial number of the element may be calculated and the original image frame may be completed by extracting the image fragment from the corresponding array element of the array C according to the serial number.

In step S804, the image packet data generated in step S803 is transmitted to the user terminal with reference to the terminal identification information. The terminal identification information is terminal-specific information that can identify the terminal, such as a mobile identification number (MIN) or a terminal serial number (ESN). In this step, the terminal identification information is determined through a predetermined communication network. The image packet data is transmitted to the user terminal corresponding to the terminal identification information.

So far, the method for providing a public network camera photographing image according to the present invention has been described, and since the above-mentioned contents of the embodiments of FIGS. 1 to 7 may be applied to the present embodiment as it is, the following detailed description will be omitted. do.

9 is a flowchart illustrating a method of providing a network camera captured image using a network camera management server according to the present invention.

In operation 901, the image transmission request information is transmitted from the user terminal 103 to the network camera management server 102. The image transmission request information includes user terminal 103 identification information, network camera 101 identification information, and an encryption code.

In operation 902, the network camera management server 102 performs user authentication based on the identification information of the user terminal 103 included in the image transmission request information. In addition, in this step, the user can be authenticated by receiving the personal information from the user, and the user can be easily authenticated with only the ID and password through membership registration.

In step 903, the image transmission request is made to the corresponding network camera 101 based on the identification information of the network camera 101. Further, in step 904, encrypted video packet data is generated from the video frame photographed by the network camera 101 in response to the video transmission request in step 903.

In step 905, the network camera 101 transmits the image packet data to the network camera management server 102, and in step 906, the network camera 101 of the user terminal 103 is transmitted from the network camera management server 102. Save your history. In operation 907, the image packet data is transmitted to the corresponding user terminal 103 by referring to the identification information of the user terminal 103. In operation 908, the image packet data received by the user terminal 103 is decrypted using an encryption code, and the image is output to the user.

The public network camera photographed image providing method according to the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. The medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a data structure, or the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

In the present invention as described above has been described by the specific embodiments, such as specific components and limited embodiments and drawings, but this is provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from such description.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and all the things that are equivalent to or equivalent to the claims as well as the following claims will belong to the scope of the present invention. .

According to the present invention, by receiving a captured image of the desired network camera using the user terminal, a plurality of users can easily track and monitor the desired monitoring object anytime, anywhere at a low cost.

In addition, according to the present invention, by encrypting the image data by using a predetermined encryption algorithm, the object of the present invention is to prevent the privacy infringement or security incidents that may occur by using the network camera jointly.

In addition, according to the present invention, as a method of encrypting video data, by using a simple encryption algorithm based on an encryption code temporarily generated according to a user's video request, video data can be encrypted simply and efficiently.

In addition, according to the present invention, by adding a user authentication process in the predetermined network camera management server or by storing the network camera usage record, it is possible to prevent the network camera photographed image from being used for impure purposes.

Claims (14)

In the network camera connected to at least one user terminal through a predetermined communication network, An image capturing unit capturing an image to generate image frame data; An image transmission request receiver configured to receive image transmission request information including terminal identification information from the user terminal; An encryption module for generating the image packet data by encrypting the image frame data using a predetermined encryption code; And An image transmitter for transmitting the image packet data to the user terminal by referring to the terminal identification information. Including, And the encryption module comprises an image divider which divides the image frame data to generate a plurality of image packet data. The method of claim 1, The encryption code is deleted when the transmission of the video packet data is completed. The method of claim 1, The image transmission request information includes a plurality of network camera identification information, and the image transmission unit sequentially transmits corresponding image packet data according to the plurality of network camera identification information. The method of claim 1, The encryption code includes frame division number information, The image divider divides the image frame data according to the frame division number information to generate a plurality of image packet data. The method of claim 1, The encryption module Random number generation unit for generating a predetermined random number by using the serial number and the encryption code of the plurality of video packet data More, And the image transmitting unit transmits the random number together with the plurality of image packet data. The method of claim 1, The encryption code is generated by the encryption module, And the image transmitting unit transmits the encryption code together with the image packet data to the user terminal. The method of claim 1, The encryption code is generated by the user terminal and transmitted to the network camera, And the user terminal decrypts the image packet data using the encryption code. The method of claim 1, The communication network includes at least one of a wired communication network, a wireless communication network, and a local area wireless communication network. In the network camera management server for providing an image taken through a communication network connected to a plurality of network camera to the user terminal, An image transmission request receiver for receiving image transmission request information from the user terminal, wherein the image transmission request information includes terminal identification information and camera identification information; An image packet data receiver configured to receive a plurality of image packet data generated by encrypting image frame data divided from a corresponding network camera by referring to the camera identification information; And An image packet data transmission unit for transmitting the image packet data to a corresponding user terminal with reference to the terminal identification information. Network camera management server comprising a. The method of claim 9, A user authentication unit which receives user identification information from the user terminal and performs user authentication based on the user identification information Network camera management server further comprises. The method of claim 9, Usage history storage unit for storing the image transmission request history of the user terminal Network camera management server further comprises. In a user terminal connected to at least one network camera through a predetermined communication network An image transmission request transmitter for transmitting image transmission request information including an encryption code to the network camera; An image receiver configured to receive a plurality of image packet data generated by encrypting image frame data divided from a corresponding network camera according to the image transmission request information; A decryption module configured to decrypt the image packet data to generate image frame data using the encryption code; And Image output unit for outputting the image frame data A user terminal comprising a. In the method for providing a network camera captured image to at least one user terminal, Photographing an image to generate image frame data; Receiving image transmission request information including terminal identification information from the user terminal; Dividing the image frame data using a predetermined encryption code, and encrypting the divided image frame data to generate a plurality of image packet data; And Transmitting the image packet data to the user terminal with reference to the terminal identification information Network camera photographed image providing method comprising a. A computer-readable recording medium having recorded thereon a program for executing the method of claim 13.

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