WO2012046907A1 - Apparatus for processing an image in a manner which protects privacy, image security system using same, and method therefor - Google Patents

Abstract

The present invention relates to an apparatus for processing an image in a manner which protects privacy, to an image security system using same, and to a method therefor. By processing only the area (particularly the facial area) in an image collected by a surveillance camera required for the protection of privacy, storing/managing the image, and restoring (protection canceling) the image to the original perceptible image at the request of the user, accidental infringement of privacy (dysfunction) can be prevented while maintaining the proper function of a monitoring system. To this end, the image security system using privacy protection according to the present invention is characterized in that it comprises: an image-collecting means which collects and encrypts images for specific security objects; and an image-monitoring/controlling means which decrypts encrypted images received from the image-collecting means, detects a security object area in the decrypted collection image, and applies a privacy protection algorithm thereto.

Description

Image protection processing device for privacy protection, image security system and method using same

The present invention relates to privacy protection in an image collection process, and more particularly, to partially protect and store / manage only an area (particularly, a human face area, etc.) that requires privacy protection in an image collected through a surveillance camera or the like. By reconstructing (unprotecting) the original recognizable image at the request of the user, it is possible to prevent unintentional invasion of privacy (reverse function) while maintaining the net function of the surveillance system. An image protection processing apparatus, an image security system using the same, and a method thereof are provided.

The present invention is derived from the research conducted as part of the Ministry of Knowledge Economy's Information and Communication Standards Technology Enhancement Project [Task Management No .: 2009-P1-31-09J47, Task Name: Development of Next Generation Biometric Applied Technology Standard].

With the development of internet technology, closed-circuit television (CCTV) has become widely used in the general field of society. In particular, it is widely used for the purpose of crime prevention and its use is gradually expanding.

Such a CCTV surveillance system generally comprises a CCTV camera 10, a video surveillance / control server 12, an authentication and access control server 14, and a client 16, as shown in FIG. Image data is exchanged between components through wired / wireless communication network. Hereinafter, each component is briefly described as follows.

CCTV surveillance system (CCTV security system, or CCTV system) transmits the image information collected through the recording device (for example, camera, etc.) installed in a certain space through a closed wired / wireless transmission path so that only a specific person can receive it. Any communication equipment that makes it possible. In other words, CCTV surveillance system is one of the most widely used physical security technology, it is installed in a specific location (space) and is used for various purposes.

The video surveillance / control server 12 not only stores / manages the video information obtained from the CCTV camera 10, but also monitors and monitors the video, and the authentication and access control server 14 stores the video that is stored / managed. To control the access of the client 16 for security. According to an embodiment, the authentication and access control server 14 may be included in the video surveillance / control server 12.

In addition, the client 16 is a system or user to receive and use a CCTV image from the video surveillance / control server 14, and may be a desktop computer, a laptop, a personal digital assistant (PDA), a mobile phone, or the like. This may correspond.

Meanwhile, as the performance of CCTV has been recently improved, technologies for automatically processing various tasks (eg, criminal arrest, etc.) have been developed through face recognition based on face information obtained from CCTV images.

However, if these technologies are exploited, there is a risk of serious privacy breach to individuals. Looking at the types of privacy threats / infringements that can occur in security systems such as CCTV surveillance systems, referring to FIG. As follows.

Security threats in security systems such as CCTV surveillance systems include: (1) privacy-related security threats that may occur in individual components, such as wired and wireless CCTVs, video surveillance / control servers, and clients; and (2) wired and wireless CCTVs and video surveillance / There is a security-related security threat that may occur during the transmission and reception of video data between the control server and the transmission and reception of video data between the video surveillance / control server and the client.

First, let's look at general threats related to CCTV surveillance systems.

Common threats include (1) unauthorized access, physical attacks, Denial of Service (DoS) / Distributed Denial of Service (DDoS) attacks in relation to CCTV cameras, and (2) video. Regarding the monitoring / control server 12, an attacker's server intrusion, database agreement, DoS / DDoS attack, attacker's interruption during data processing, etc. (3) Data processing with respect to the client 16 There is interference of the attacker. In particular, if the client 16 is a "mobile phone," there are threats such as Universal Subscriber Identity Module (USIM) replication, mobile phone replication, image acquisition and corruption through mobile malware, and the client 16 is a "desktop computer." In this case, there are threats such as IP manipulation (remote control, unauthorized access), viruses and malware, and spyware forced installation. In the case where the client 16 is a "mobile device," it is a mobile virus and malware, IP replication (Wi- Fi) and terminal duplication.

On the other hand, when transmitting the video from the CCTV camera 10 to the video surveillance / control server 14, there are eavesdropping, retransmission attack, man-in-the-middle attack, bill of fire attack, video surveillance / control server 12 and client 16 ) Transmits and receives data including image information, there are eavesdropping, retransmission attacks, man-in-the-middle attacks, bill-of-fire attacks, IP (Internet Protocol) disturbances, and DoS / DDoS attacks.

Next, privacy threats / infringements will be described.

First, in the case of collecting unrecognized personal information such as location information, video information, and physical information in real time with respect to the CCTV camera 10, when collecting personal information by illegal means such as a sneak camera / illegal interception device, illegal There is a privacy threat / invasion, such as when the personal image information is collected and photographed (for example, a bathhouse) without permission.

Second, privacy threats / infringements related to the video surveillance / control server 12 include the storage and use of personal video information through illegal or privacy infringement, illegal surveillance and attacks by administrators / internals, and unauthorized user or third party intrusions. Access / leak / invasion of personal privacy information by personal information, exposure of personal characteristic information due to use of indiscriminate identification system, invasion of personal privacy, leakage of undestructed personal information due to unsettled video storage period, and uncontrolled image quality control Personal privacy violations that occur.

Third, with respect to the client 16, unauthorized use and commercial / political use of personal information without your consent, invasion of personal privacy due to similar bio information, illegal leakage of personal privacy information, sharing / utilization of personal information between heterogeneous services, There are privacy threats / infringements, such as failure to destroy and delete personal information, excessive request / collection / use of personal information not related to service use.

Fourth, privacy threats / infringements that may occur in the case of transmitting / receiving data including video information (e.g., sending / receiving between CCTV and video surveillance / control server or between video surveillance / control server and client), Eavesdropping and exposure of privacy information, transmission and reception of forged personal privacy information, and the like.

In short, there is an advantage (net function) that can achieve various purposes by using CCTV today, and its field of use is increasing. Behind this positive aspect, the collection, storage (archive), transmission, utilization of personal video information, etc. In relation to this, there is a problem that various types of privacy threats / infringements are occurring or are likely to occur as described above. Such infringement of privacy is extremely difficult or impossible to recover once it has occurred. It is important to prevent.

Accordingly, an object of the present invention is to provide an image protection processing device for privacy protection, an image security system using the same, and a method thereof, which can prevent an unintended privacy infringement (inverse function) while maintaining the net function of a surveillance system. There is this.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned above can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to achieve the above object, the present invention partially protects and stores / manages only the area requiring privacy protection from an image collected through a surveillance camera or the like, and restores the original recognizable image according to a user's request. Protection release).

More specifically, the present invention provides an image protection processing apparatus for privacy protection, comprising: detecting means for detecting a region to be protected from a collected image; Protection processing means for generating a protected image having an unrecognized area by applying a privacy protection algorithm to the detected protected area; And management means for storing / managing the generated protected image.

In addition, the present invention provides a video security system using privacy protection, comprising: image collecting means for collecting and encrypting an image for a specific security target; And image monitoring / control means for decoding the encrypted image received from the image collecting means, detecting a protection target region from the decrypted collected image, and applying a privacy protection algorithm.

In addition, the present invention, the image security method for privacy protection, comprising: detecting a region to be protected from the image collected for the security target; Generating and storing / managing a protected image having an unrecognized area by applying a privacy protection algorithm to the detected protected area; And restoring the original image by applying a privacy protection release algorithm to the protected image according to the client's protection release request.

The invention as described above partially protects and stores / manages only the area (in particular, the face area of the person) that requires privacy protection from the image collected through the CCTV surveillance system, and restores the original recognizable image as needed ( Since the protection system is used to achieve the original purpose or pure function of the surveillance system, it can effectively prevent unintended leakage of personal information or invasion of privacy.

In addition, the present invention has the effect of minimizing the possibility of leakage of personal information or invasion of privacy by applying encryption / decryption techniques to images transmitted and received between CCTV cameras (video collection devices), video surveillance / control servers, and clients. have.

In addition, the present invention has the effect of pioneering and activating a biometric-based physical security area by combining a physical security technology such as a CCTV surveillance system with a human face area detection technology, which is a kind of biometric recognition technology.

1 is a configuration example of a general CCTV surveillance system,

2 is an explanatory diagram of a privacy-related security threat that may occur in a CCTV surveillance system;

3 is a configuration diagram of an embodiment of a video security system using privacy protection according to the present invention;

4 is an overall explanatory diagram of a security process performed in each component of the video security system of FIG. 3 according to the present invention;

5 is a flowchart illustrating a method for obtaining a privacy-protected image by a client according to the present invention;

6 is a diagram illustrating an embodiment of a privacy protection framework using face region detection according to the present invention;

7A is a flowchart illustrating a method of generating a privacy protection processed image according to the present invention;

7B is a flowchart illustrating a method of generating a privacy deprotection image according to the present invention;

8A is a flowchart of an image scrambling method applied to the present invention;

8B is a flowchart illustrating an image descrambling method applied to the present invention.

The present invention relates to an image protection processing device for privacy protection.

Detection means for detecting a region to be protected from the collected image;

Protection processing means for generating a protected image having an unrecognized area by applying a privacy protection algorithm to the detected protected area; And

Management means for storing / managing the generated protected image

It provides an image protection processing device comprising a.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a configuration diagram of an image security system using privacy protection according to an embodiment of the present invention, which illustrates a process of detecting and protecting a specific area of a collected image (privacy protection processing). In particular, FIG. 3 illustrates a process of protecting privacy by using face area detection in a CCTV surveillance system. Hereinafter, while describing the video security system according to the present invention, a video security method performed in the system will be described together.

The present invention obtains the user's face information obtained from the CCTV surveillance system through the detection of the face area as part of the bio-recognition, and performs a protection process such as mosaic, scrambling and so on so as not to recognize who is stored so that personal information is not exposed If necessary, it is characterized by reconstructing the original image through a reverse scrambling process.

The video security system ("broad video security system") according to the present invention for performing this function, as shown in the drawing, one or more video collection device 300, video surveillance / control server 310, And a client 320. Here, only the image acquisition apparatus 300 and the image surveillance / control server 310 may be referred to as a video security system (“video security system in consultation”). Hereinafter, each component will be described.

First, the image collection device 300 collects (acquires) an image of a surveillance object and transmits the image to the image surveillance / control server 310 safely, and in particular, encrypts and transmits the collected (acquired) image for privacy protection. do.

The image acquisition apparatus 300 corresponds to a CCTV camera, and the CCTV camera may include an encryption module itself, and in some embodiments, may download and use an encryption application from the video surveillance / control server 310. Here, a CCTV camera may be a USB (Universal Serial Bus) camera or an IP (Internet Protocol) camera. In the case of a wireless Wi-Fi camera, it is very easy to install and can be easily installed at any location at low cost. There is this. The analog camera may also be used as a CCTV camera, and in this case, the digitalization module and the encryption module may be included in the image acquisition device 300.

Next, the video surveillance / control server 310 will be described.

The video surveillance / control server 310 processes and stores / manages the images received from the image capturing apparatus 300 in a form suitable for a specific purpose (“privacy protection processing”), and stores the images according to a client's request. The level of privacy protection is performed and the processed image is encrypted and transmitted to the client 320 through the wired / wireless communication network.

As shown in the figure, the video surveillance / control server 310 may be referred to as an image receiving processing unit 311 and an image protection processing device 312 (“image protection processing unit”), which is merely a difference in name. , And there is no difference in the functions performed by them), and the image transmission processing unit 313, which will be described in detail below. For reference, although not shown in the drawings, the video surveillance / control server 310 may include a monitoring unit, a display unit, an authentication and access control unit, and the like.

The image receiving processor 311 receives an image from the image collecting apparatus 300 through a wired / wireless network, and performs a decryption process when the received image is encrypted. That is, the image receiving processor 311 includes a receiver 3111 for receiving an image through a wired / wireless network and a decoder 3112 for decoding the received image. The image receiving processing unit 311 is a CCTV camera that is authenticated through verification of an X.509v3-based CCTV device certificate (CCTV certificate) in relation to the image collecting device 300 in receiving an image through the receiving unit 3111. Check whether or not. In detail, the conventional CCTV surveillance system did not consider the CCTV-only certificate, and thus, general users, including administrators, could not verify whether the corresponding CCTV camera is a legal / illegal / sneaky camera. Therefore, in the present invention, by mounting a dedicated certificate having a format suitable for the CCTV environment in the CCTV camera, the image receiving processing unit 311 in receiving the collected image from the CCTV camera corresponding to the embodiment of the image collecting device 300 CCTV Device authentication can be performed through a dedicated certificate.

An image protection processing device (image protection processing unit) 312 includes a face area detection unit 3121, a protection processing unit 3122, and a storage / management unit 3123, which will be described below.

The face area detector 3121 detects a face area from the collected image (decoded image), where the face area is an example of the “protected area”, and may be a part (area) other than the face according to an embodiment. Hereinafter, the protection target region will be described as being limited to the "face region".

The face area detection technique is a process to be performed before the face recognition process and is a technique of finding out where the face is in the image. In general, up to the step of finding the main parts of the face such as eyes, nose, mouth, etc. in face recognition is called "face area detection", and the pre-processing and feature extraction step after detecting the face area are called "feature extraction step". The face detection technique uses bio-recognition techniques, which include knowledge-based methods, feature-based methods, template-based methods, and appearance-based methods. -Based Mthods).

The protection processing unit 3122 applies an appropriate privacy protection algorithm (privacy protection application algorithm) to the protection target area (face area) detected by the face area detection unit 3121, and " protection image having unrecognized area " For example, an image in which a face region is changed to an unrecognized state (hereinafter, in some cases, simply referred to as "privacy protection image", "protected image", and "protection image") is generated and stored safely. Manage. Here, the privacy protection algorithm (privacy protection application algorithm) includes an algorithm of an encryption method, a scrambling method, or a masking method. In addition, when the storage / management unit 3123 receives an image request from the client, the protection processing unit 3122 restores (generates) the original image by applying an appropriate privacy protection release algorithm to the image (protected image). That is, the original image is reconstructed (generated) by applying a privacy protection release algorithm to an unrecognized region (eg, a face region in an unrecognized state) of the protected image.

The storage / management unit 3123 safely stores / manages an image (protection processing image) that has been subjected to privacy protection processing in the protection processing unit 3122, and in particular, controls access to the stored image. The storage / management unit 3123 may store an image through a separate DVR (Digital Video Recorder) server.

In addition, when the storage / management unit 3123 receives a request for a specific image from the client 320, the storage / management unit 3123 finds a corresponding protected processing image (an image in the state where privacy protection processing is applied) that is safely stored / managed, and then the image transmission processor 313. ) To the client 320. Accordingly, when a protection release (privacy protection release) for the face image is requested from the client 320, the storage / management unit 3123 obtains a reconstruction image (privacy protection release image) through interworking with the protection processing unit 3122. Thereafter, the image transmission processor 313 transmits the data to the client 320.

In relation to the protection release, the client 320 may request the protection release only for a part of the protection areas among the plurality of protection areas existing in the protected image. A specific processing method in this case will be described. If the client 320 requests protection release (privacy protection) only for face images of k (<n) persons who need privacy removal (unprotection) among the n privacy-protected persons present in the image, The management unit 3123 acquires the reconstructed image (the privacy protection release image for k persons) through the interworking with the protection processor 3122, and transmits the reconstructed image to the client 320 through the image transmission processor 313. In this way, privacy protection is maintained for the n-k names that were not subject to protection.

According to an exemplary embodiment, when the storage / management unit 3123 receives a request for a "unprotected specific image" from the client 320, the storage / management unit 3123 immediately acquires a reconstructed image (privacy protection release image) through interworking with the protection processing unit 3122. After that, the image transmission processor 313 transmits the data to the client 320.

Meanwhile, the image transmission processor 313 transmits an image to the client 320 through a wired / wireless network, and encrypts and transmits an image to be transmitted. That is, the image transmission processor 313 includes an encryption unit 3131 for encrypting a transmission target image, and a receiver 3132 for transmitting an encrypted image to a client through a wired / wireless network.

On the other hand, the client 320 corresponds to a user terminal, the image received from the video surveillance / control server 310 for a variety of purposes, such as authentication, identification (ID) management, crime prevention, evidence collection, terrorism prevention, access management Use it accordingly. The interaction between the video surveillance / control server 310 and the client 320 will be described in detail with reference to FIG. 5.

Figure 4 is a general description of the security process performed in each component of the video security system of Figure 3 according to the present invention, each component (ie CCTV camera, video surveillance / control server, client) of the video security system Shows the privacy-related security functions performed by and the privacy-related security functions performed by the components.

Regarding the security function in each component of the video security system, (1) the CCTV camera 300 performs video encryption 400, device authentication through a CCTV-only certificate (401), and (2) video surveillance. In the control server 310, image encryption / decryption 410, image storage / management and access control / authentication 411, face region detection 412, privacy protection application / release image generation 413, etc. are performed. (3) The client performs image decoding 420 or the like.

On the other hand, in relation to the privacy-related security functions performed between the components between the CCTV camera 300 and the video surveillance / control server 310, and between the video surveillance / control server 310 and the client 320 encrypted image Secure transmission / reception of the connection is made (430, 440).

FIG. 5 is a flowchart illustrating a method of obtaining a privacy-protected image by a client according to the present invention, and illustrates a processing performed between the video surveillance / control server and the client through a wired / wireless communication network.

When the video surveillance / control server 310 receives a request for a specific video from the client 320 (500), it searches for and reads the corresponding protected video (video in which privacy protection processing is applied) that is securely stored / managed. After on (502), it is encrypted (504) and sent to the client (320) (506).

Then, the client 320 decodes the received protection process image (508) and then retrieves the face image needed by the client (510), and monitors / unblocks the protection of the detected face image (privacy protection). Request to the control server 310 (512). As described above in detail with reference to FIG. 3, the client 320 may request a privacy protection release request for only a face image (ie, a face image of a plurality of protected face images) required by the client 320.

Accordingly, the video surveillance / control server 310 restores the face image information using the privacy protection algorithm (514), encrypts the restored image information (516), and securely transmits it to the client (320). 518).

When the client 320 receives the requested video from the video surveillance / control server 310, the client 320 decodes the received video (520) and utilizes the received video (522).

As can be seen through the above "504" and "516" process, the data transmission / reception between the video surveillance / control server 310 and the client 320 should be performed safely, the video surveillance / control server 310 It is preferable to perform encryption on the image (regardless of whether privacy protection processing) is transmitted to the client 320.

Meanwhile, according to the exemplary embodiment, when the video surveillance / control server 310 receives a request for the "unprotected specific video" from the client 320, the protection cancellation algorithm is immediately applied to the video without the process "506" to "510". By applying (Privacy Protection Release Algorithm), the original image can be restored and transmitted.

FIG. 6 is an exemplary diagram illustrating a privacy protection framework using face region detection according to the present invention, and illustrates a security framework for protecting personal information using face region detection in a CCTV environment. In particular, the framework includes a security technology to be applied for each security function, and also shows a privacy protection method performed in the process of capturing and storing / using CCTV images, which will be described in detail below.

First, a method of encrypting and decrypting data (including image information) will be described.

After the CCTV camera 300 captures the image of the surveillance / security target and encrypts the image and transmits the image to the video surveillance / control server 310 safely, the video surveillance / control server 310 receives the received encrypted image. After decoding, the image is stored through an appropriate processing procedure (for example, privacy protection processing).

In addition, when the client 320 requests an image from the video surveillance / control server 310, the client 320 undergoes an encryption / decryption process. At this time, encryption based on a certificate, a public key, and a symmetric key is applied.

Next, a description will be given of the security method in the transmission / reception of data (including image information) between the components.

In order to securely transmit and receive data between the CCTV camera 300 and the video surveillance / control server 310 and the video surveillance / control server 310 and the client (video requestor) 320 based on the public certificate / public key / symmetric key. It should be able to prevent eavesdropping and forgery from attackers through derivation of session key such as Secure Socket Layer (SSL) / Transport Layer Security (TLS), secure channel setting, and X.509v3-based device authentication.

Next, a method of detecting a face region in the video surveillance / control server 310 will be described.

The video surveillance / control server 310 decrypts the encrypted image received from the CCTV camera 300 and protects privacy by performing a face region detection process based on a suitable face region detection algorithm. Knowledge-based, feature-based, template matching, and appearance-based methods.

Next, a privacy protection process and a protection releasing method in the video surveillance / control server 310 will be described.

In order to provide privacy protection for personal image information, a protected image (privacy protection image) is generated using a privacy protection algorithm (privacy level adjustment) suitable for a face image detected through a face region detection technique. . Here, the privacy protection processing techniques include encryption techniques, scrambling techniques, masking techniques, and the like, and in particular, chaotic based scrambling techniques will be described in detail with reference to FIG. 8A.

The video surveillance / control server 310 decodes an image stored and managed in a storage medium, and then applies an appropriate privacy protection algorithm to thereby detect (recognize) a face region (privacy protection). Release image). Here, the privacy protection technique includes a decryption technique, a reverse scrambling technique, a reverse masking technique, and the like. In particular, the reverse scrambling technique will be described in detail with reference to FIG. 8B.

Next, an image storage / management and access control method in the video surveillance / control server 310 will be described.

The video surveillance / control server 310 stores / manages the video information generated through the privacy protection algorithm by applying safe video storage / management methods. At this time, access control, watermarking encoding technique, steganography encoding technique, encryption technique, face image separation storage technique, intentional deterioration encoding technique, image storage technique using speech modulation, etc. may be applied.

  When the video surveillance / control server 310 receives a request for a specific video from the client 320, the video monitoring / control server 310 applies a secure video reading algorithm to decode the video. In this case, techniques such as access control, watermark decoding, steganography decoding, decoding, separate face image restoration, intentional deterioration image decoding, and image restoration using speech modulation restoration may be applied. In particular, X.509v3 device authentication techniques that provide device identification and authentication can be applied for CCTV device authentication.

FIG. 7A is a flowchart illustrating a method of generating a privacy protection processing image according to an exemplary embodiment of the present invention, and illustrates a process in which the video surveillance / control server 310 performs privacy protection processing through face detection and scrambling.

The image surveillance / control server 310 captures image information transmitted by the CCTV camera corresponding to the image acquisition apparatus 300 (700), and detects a face region from the captured image information (702).

Thereafter, the video surveillance / control server 310 applies a scrambling technique to the detected face (704), and stores the resulting “scrambled video” (protected video) in the storage / management unit 3123 or the DVR. The image data is stored in the server (when the image is stored in a separate external storage server) (706).

FIG. 7B is a flowchart illustrating a method of generating a privacy deprotection image according to an exemplary embodiment of the present invention, and illustrates a process in which the image monitoring / control server 310 performs privacy deprotection through reverse scrambling.

The video surveillance / control server 310 is a video stored in a storage / management unit 3123 or a DVR server (a case where an image is stored in a separate external storage server, which is not shown in the figure) (protected video). In step 710, the stored face position information is read (712) when the scrambling is applied.

Next, the video surveillance / control server 310 applies descrambling using the face position information (714) and stores the resulting image (descrambled image, that is, unprotected image) (716). ).

FIG. 8A is a flowchart illustrating an image scrambling method applied to the present invention, and illustrates a chaotic based scrambling process 800 performed by the video surveillance / control server 310.

Image scrambling is an input key and an original image as inputs, which makes the original image unrecognizable by complicating the image position or pixel color. However, if necessary, it should be possible to reproduce the original image by a specific algorithm (inverse algorithm). Such image scrambling techniques include various methods such as a method based on a chaotic map system and an Arnold transform.

When the video surveillance / control server 310 receives an input key and an image (original image) to be scrambling, the video surveillance / control server 310 obtains a chaotic sequence using a logistic map function (801), and obtains the chaotic sequence. Arrange 802 to obtain a scrambling table.

Then, the image monitoring / control server 310 outputs (generates) the scrambling image (privacy protection image) by changing the position of the pixels of the original image using the scrambling table (803).

FIG. 8B is a flowchart illustrating a video descrambling method applied to the present invention, and illustrates a chaotic-based descrambling process 810 performed by the video surveillance / control server 310.

When the video surveillance / control server 310 receives an input key and an image (protected image) to be descrambling, the video surveillance / control server 310 obtains a chaotic sequence using a logistic map function (811). The descrambling table is obtained by sorting the chaotic order (812).

Then, the image monitoring / control server 310 outputs (generates) a descrambling image (privacy protection release image) by changing the position of pixels of the descrambling target image using the descrambling table (813).

On the other hand, the method of the present invention as described above can be written in a computer program. And the code and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the written program is stored in a computer-readable recording medium (information storage medium), and read and executed by a computer to implement the method of the present invention. The recording medium may include any type of computer readable recording medium.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

The present invention partially protects and stores / manages only the areas requiring privacy protection (especially human face areas, etc.) from images collected through a CCTV surveillance system, and restores the original recognizable image as necessary (unprotection). Because it is used to maintain and maintain the original purpose or pure function of the surveillance system, the image protection processing device for privacy protection and the image using the same can effectively prevent unintended leakage of personal information or invasion of privacy. It can be employed as a security system and method.

Claims (17)

1. In the image protection processing device for privacy protection,

   Detection means for detecting a region to be protected from the collected image;

   Protection processing means for generating a protected image having an unrecognized area by applying a privacy protection algorithm to the detected protected area; And

   Management means for storing / managing the generated protected image

   Image protection processing device comprising a.
2. The method of claim 1,

   The protection processing means,

   The method further restores the original image by applying a privacy protection algorithm to the corresponding protected image requested to be released from the client. An image protection processing device, characterized by applying a protection release algorithm.
3. The method of claim 2,

   The storage / management means,

   And controlling the access to the stored image and interworking with the protection processing means for releasing privacy protection according to the client's protection release request.
4. The method of claim 3, wherein

   The storage / management means,

   In response to a request for a specific image from the client, the protected processing image is searched for and transmitted to the client through an image transmission processor, and the protection processing means is requested by the client to release the protection of a specific region of the image. And a restored original image is transmitted to the client through the image transmission processor.
5. The method according to any one of claims 1 to 4,

   The detection means,

   And a human face region is detected from the collected image by using biometric technology.
6. The method of claim 5,

   The detection means,

   And a human face region is detected by applying any one of a knowledge-based method, a feature-based method, a template matching method, and an appearance-based method.
7. The method according to any one of claims 1 to 4,

   The privacy protection algorithm,

   The image protection processing device, characterized in that any one of an encryption method, chaotic based scrambling method or a masking method.
8. In the video security system using privacy protection,

   Image collection means for collecting and encrypting an image for a specific security target; And

   Image monitoring / control means for decoding the encrypted image received from the image collecting means, detecting a protected area from the decoded collected image and applying a privacy protection algorithm.

   Image security system comprising a.
9. The method of claim 8,

   The image collecting means,

   A video security system, characterized in that it is a closed circuit television (CCTV) camera.
10. The method of claim 8,

    The protected area,

    A video security system, characterized in that the human face area.
11. The method according to any one of claims 8 to 10,

    The video surveillance / control means,

    Image receiving processing means for receiving and decoding an encrypted image from the image collecting means; And

    Image protection processing means for detecting a protected area from the decoded image, and generating and storing / managing a protected image having an unrecognized area by applying a privacy protection algorithm to the detected protected area.

    Image security system comprising a.
12. The method of claim 11,

    The video receiving processing means,

    And a device authentication through a dedicated certificate held by the video collecting means.
13. The method of claim 11,

    The image protection processing means,

    The method further restores the original image by applying a privacy protection release algorithm to the corresponding protected image requested to be released from the client. A video security system, characterized by applying a protection release algorithm.
14. The method of claim 13,

    Image transmission processing means for encrypting the restored original image and transmitting it to the client

    Video security system further comprising.
15. The method of claim 14,

    The image protection processing means,

    In response to a request for a specific video from the client, the corresponding protected video is searched and transmitted to the video transmission processing means, and the restored original video is transmitted to the video when the client is requested to release protection for a specific area of the video. Video security system, characterized in that the transmission to the transmission processing means.
16. In the video security method for privacy protection,

    Detecting a region to be protected from an image collected for the security object;

    Generating and storing / managing a protected image having an unrecognized area by applying a privacy protection algorithm to the detected protected area; And

    Restoring the original image by applying a privacy protection algorithm to the protected image according to the client's request to release protection;

    Image security method comprising a.
17. The method of claim 16,

    Restoring the original image,

    The method of claim 1, wherein the privacy protection algorithm is applied to the protection release request for a portion of the protected area.

Images