WO2016088347A1 - 管理装置及び画像処理システム - Google Patents

管理装置及び画像処理システム Download PDF

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Publication number
WO2016088347A1
WO2016088347A1 PCT/JP2015/005939 JP2015005939W WO2016088347A1 WO 2016088347 A1 WO2016088347 A1 WO 2016088347A1 JP 2015005939 W JP2015005939 W JP 2015005939W WO 2016088347 A1 WO2016088347 A1 WO 2016088347A1
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Prior art keywords
data
resolution
image data
unit
image
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PCT/JP2015/005939
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English (en)
French (fr)
Japanese (ja)
Inventor
小林　正明
正克 松尾
武藤　浩二
勝則 古賀田
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Priority to US15/524,108 priority Critical patent/US10230997B2/en
Priority to EP15864842.8A priority patent/EP3229465B1/en
Publication of WO2016088347A1 publication Critical patent/WO2016088347A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
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    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/085—Secret sharing or secret splitting, e.g. threshold schemes
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    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6125—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via Internet
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    • H04N21/6156—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
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    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
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    • H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
    • H04N7/0117—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving conversion of the spatial resolution of the incoming video signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04N9/00—Details of colour television systems
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    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H—ELECTRICITY
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    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91357—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal

Definitions

  • the present disclosure relates to a management device for distributing and secretly managing video data and an image processing system using the management device.
  • Patent Document 1 main video data is received through a first route (broadcast wave), and when necessary, difference data for high image quality is received through a second route (network) and the difference from the main video data.
  • a technique for synthesizing data is disclosed. With the technique disclosed in Patent Document 1, the video data is reproduced only by acquiring the main video data.
  • content video, surveillance camera video, etc. are transmitted / stored in a network environment, The purpose is to ensure security against privacy.
  • the management apparatus includes a resolution conversion unit that converts input image data into N types (N is a plurality) of image data having different resolutions, and each of the plurality of image data (n is N + 1 or more). Dividing into distributed data of integers that are the same value in all image data, and using k pieces (k is an integer of 2 to n and different from each other for each image data)
  • the secret sharing processing unit that performs secret sharing processing so that it can be restored to the original image data and the distributed data selected one by one so as not to overlap each other are generated to generate n combined data,
  • a data combining unit that stores data in different storages.
  • an image processing system includes the management device described above and a storage that stores combined data.
  • FIG. 1 is a diagram illustrating a configuration of an image processing system according to the first embodiment of the present disclosure.
  • FIG. 2 is a block diagram illustrating an internal configuration of the video management server according to the first embodiment of the present disclosure.
  • FIG. 3 is a diagram illustrating an example of information stored in the video management server according to Embodiment 1 of the present disclosure.
  • FIG. 4 is a diagram for explaining the secret sharing process.
  • FIG. 5 is a diagram illustrating a processing procedure performed by the video management server according to the first embodiment of the present disclosure.
  • FIG. 6 is a diagram illustrating a specific example of processing performed by the video management server according to Embodiment 1 of the present disclosure.
  • FIG. 7 is a block diagram showing an internal configuration of the receiving apparatus according to Embodiment 1 of the present disclosure.
  • FIG. 1 is a diagram illustrating a configuration of an image processing system according to the first embodiment of the present disclosure.
  • FIG. 2 is a block diagram illustrating an internal configuration of the video management server according to the
  • FIG. 8 is a diagram illustrating a procedure of processing performed by the reception apparatus according to Embodiment 1 of the present disclosure.
  • FIG. 9 is a block diagram illustrating an internal configuration of the video management server according to the second embodiment of the present disclosure.
  • FIG. 10 is a diagram illustrating a procedure of processes performed by the video management server according to the second embodiment of the present disclosure.
  • FIG. 11 is a diagram illustrating a specific example of processing performed by the video management server according to the second embodiment of the present disclosure.
  • FIG. 12 is a block diagram showing an internal configuration of the receiving apparatus according to Embodiment 2 of the present disclosure.
  • FIG. 13 is a diagram illustrating a procedure of processing performed by the reception apparatus according to Embodiment 2 of the present disclosure.
  • FIG. 1 is a diagram illustrating a configuration of an image processing system according to the present embodiment.
  • the image processing system mainly includes a video / content creation unit 10, a video / content storage unit 20, and a video / content browsing unit 30.
  • the video / content creation unit 10 sends video data created by the cameras 11, 12, video data saved in the personal computer 13, etc. via a communication device 14 such as a router / modem connected to the Internet. Transmit to the content storage unit 20.
  • the video / content storage unit 20 processes the video data received from the video / content creation unit 10 by the video management server 21 to create distributed data, and a plurality of storages 22 (22-1, 22-2,... 22-n), the distributed data is distributed and stored.
  • the internal configuration of the video management server 21 and the manner in which the distributed data is stored in the storage 22 will be described later.
  • the video / content browsing unit 30 receives the distributed data stored in the plurality of storages 22 by the receiving device 33 via the communication device 31 such as the router / modem, and the receiving device 33 combines the received distributed data.
  • the video data is restored, and the restored video data is output to the display 34.
  • the processing performed by the receiving device 33 may be performed inside the mobile terminal 32 or the personal computers 35 and 36. The internal configuration of the receiving device 33 will be described later.
  • the video management server 21 includes a data receiving unit 101, a storage unit 102, a control unit 103, a resolution conversion unit 104, an image encoding unit 105, a secret sharing processing unit 106, data It is mainly composed of a coupling unit 107 and a data transmission unit 108.
  • the data reception unit 101 receives the video data transmitted from the video / content creation unit 10 via the Internet, and outputs the video data to the control unit 103 and the resolution conversion unit 104.
  • the storage unit 102 stores N types (N is an integer of 2 or more) of converted resolutions and resolution conversion parameters (horizontal pixels) for each post-conversion resolution for each resolution of original image data that is image data before conversion. (Number, number of vertical pixels) and secret sharing parameters (n (number of shares), k (threshold)) are stored in association with each other in a table format (see FIG. 3). Note that n is N + ⁇ ( ⁇ is an integer of 1 or more). K is an integer of 2 to n. In this embodiment, k takes a different value for each resolution after conversion, and takes a larger value as the resolution is higher.
  • the control unit 103 selects N types of converted resolutions based on the resolution (number of pixels) of the image data of the video data input from the data receiving unit 101, and instructs the resolution conversion unit 104 of the converted resolutions. .
  • the resolution conversion unit 104 receives the video input from the data reception unit 101 based on information (resolution conversion parameters corresponding to each resolution) stored in the storage unit 102 so that each resolution instructed by the control unit 103 is obtained.
  • the resolution of the data original image data
  • video data of N types of resolutions is generated and output to the image encoding unit 105.
  • the resolution conversion unit 104 converts the resolution of the original image data to the resolution RS for thumbnails, generates thumbnails, and generates image codes. To the conversion unit 105.
  • the image encoding unit 105 performs compression encoding processing on the image data of each resolution output from the resolution conversion unit 104 and outputs the result to the secret sharing processing unit 106.
  • the image encoding unit 105 performs compression encoding processing on the thumbnail and outputs the result to the data combining unit 107.
  • the secret sharing processing unit 106 applies each compression-encoded image data output from the image encoding unit 105 based on information stored in the storage unit 102 (secret sharing parameters corresponding to each resolution). Secret sharing processing is performed, n pieces of shared data are generated for each resolution, and output to the data combining unit 107.
  • secret sharing processing one data s to be kept secret can be divided into a plurality of n pieces of distributed data, and k (k ⁇ n) of them can be used to restore the original data s. This is processing that prevents the original data s from being restored from less than the number of pieces of distributed data (see FIG. 4).
  • the data combining unit 107 adds a head marker, a secret sharing parameter, and a terminal marker to each distributed data, and generates combined data by combining the distributed data selected one by one so as not to overlap each resolution. Therefore, a total of n pieces of combined data are generated.
  • the data combining unit 107 adds the thumbnail after compression encoding to all the combined data.
  • the data transmission unit 108 transmits the generated n pieces of combined data to different storages 22-i (i is an integer of 1 to n) and stores them.
  • the storage 22-i may be connected via an intranet, or may be connected via the Internet.
  • the data transmission unit 108 has a function of selecting j pieces of combined data (j is an integer not less than 2 and not more than n) from the storage 22-i in response to a request from the reception device 33 and transmitting the selected combination data to the reception device 33. There may be.
  • the resolution conversion unit 104 converts the resolution of the original image data, and generates image data of N types of resolutions. In addition, when attaching a thumbnail, the resolution conversion part 104 also produces
  • the image encoding unit 105 performs compression encoding processing on N types of image data of each resolution.
  • the image encoding unit 105 also performs compression encoding processing on the thumbnail image data (S202).
  • the secret sharing processing unit 106 performs secret sharing processing on the compression-encoded image data of N types of resolutions excluding thumbnails, and generates n pieces of shared data for each resolution (S203). .
  • the data combination unit 107 combines the distributed data selected one by one so as not to overlap from each resolution, and generates n pieces of combined data.
  • the thumbnail is added to all the combined data (S204).
  • image data and thumbnails of three types of resolution R1 (3840 ⁇ 2160 dots), resolution R2 (1920 ⁇ 1080 dots), and resolution R3 (640 ⁇ 480 dots) are generated. Then, the image data of each resolution is divided into four pieces of distributed data by secret sharing processing.
  • the image data with the resolution R1 can be restored to the original image data by using four pieces of distributed data.
  • the image data with the resolution R2 can be restored to the original image data by using three pieces of distributed data.
  • the image data with the resolution R3 can be restored to the original image data by using two pieces of distributed data.
  • the thumbnail is a reduced version of the original image data.
  • the thumbnail has deteriorated to the extent that copyright cannot be claimed in the content video, or has deteriorated to the extent that privacy information is not included in the surveillance camera video. Is in a low state. Even if thumbnails are played, security for copyright and privacy is ensured. Also, the original image data cannot be restored from the thumbnail.
  • thumbnails are combined with the shared data 1-1, 2-1, 3-1 selected so as not to overlap from the resolutions R1, R2, and R3, and stored in the storage 22-1 Is done.
  • the thumbnails are combined with the distributed data 1-2, 2-2, and 3-2 selected one by one so as not to overlap from the resolutions R1, R2, and R3, and are stored in the storage 22-2.
  • the distributed data 1-3, 2-3, 3-3 selected one by one so as not to overlap from the resolutions R1, R2, R3 and the thumbnail are combined and stored in the storage 22-3, and each resolution R1, R2 , R3 and the shared data 1-4, 2-4, 3-4 selected one by one so as not to overlap, and the thumbnail are combined and stored in the storage 22-4.
  • the reception device 33 includes a data reception unit 301, a control unit 302, a data separation unit 303, a secret sharing / restoration unit 304, an image decryption unit 305, and a data transmission unit 306. Configured.
  • the data receiving unit 301 receives j pieces of combined data (j is an integer from 2 to n) from the storage 22-i (i is an integer from 1 to n) via the Internet.
  • the data is output to the separation unit 303.
  • the number of combined data that can be received by the data receiving unit 301 is determined based on the authority of the user. For example, the data receiving unit 301 is more connected to a user with higher authority (such as paying a higher fee for the system or having higher access authority as a data administrator). Data can be accessed and received. As a result, a user with higher authority can view high-quality image data.
  • the data received by the data receiving unit 301 may be configured such that the video management server 21 selects and sends j pieces of combined data from the storage 22-i in response to a request from the receiving device 33.
  • the control unit 302 selects the resolution of the image data to be restored (hereinafter referred to as “restored image data”) based on the number j of combined data input from the data receiving unit 301, and the data separation unit 303 Specify the distributed data of the selected resolution.
  • the resolution R2 can be restored, so the resolution of the restored image data is R2.
  • the data separator 303 is instructed with three pieces of distributed data (for example, distributed data 2-1, 2-2, 2-3) having a resolution R2.
  • the data separation unit 303 separates the distributed data instructed by the control unit 302 from the combined data and outputs the separated data to the secret sharing restoration unit 304.
  • the secret sharing restoration unit 304 performs secret sharing restoration processing on the shared data output from the data separation unit 303 and outputs the restored image data to the image decoding unit 305. Note that the image data restored by the secret sharing restoration unit 304 is in an encoded state.
  • the image decoding unit 305 performs a decoding process corresponding to the compression coding of the image coding unit 105 on the restored image data output from the secret sharing restoration unit 304, and generates restored image data that can be viewed by the user. To the data transmission unit 306.
  • the data transmission unit 306 outputs the restored image data output from the image decoding unit 305 to the display 34, and the restored image data is displayed on the display 34.
  • the secret sharing restoration unit 304 performs secret sharing restoration processing on k pieces of shared data
  • the image decoding unit 305 performs decoding processing to generate restored image data that can be viewed by the user (S402). , S403).
  • the restored image data generated by the image decoding unit 305 is displayed on the display 34. Further, the processing performed by the receiving device 33 may be performed inside the mobile terminal 32 or the personal computers 35 and 36.
  • each of a plurality of pieces of image data having different resolutions is converted into n pieces (n is an integer of 3 or more and the same value in all image data).
  • n is an integer of 3 or more and the same value in all image data.
  • secret sharing processing is performed so that the original image data can be restored.
  • the distributed data selected one by one so as not to overlap is combined to generate n pieces of combined data, and each piece of combined data is stored in different storages.
  • the video management server 21a shown in FIG. 9 adopts a configuration in which a difference image generation unit 501 is added to the video management server 21 shown in FIG.
  • the resolution conversion unit 104 generates image data and thumbnails of N types of resolutions and outputs them to the difference image generation unit 501.
  • the difference image generation unit 501 generates N pieces of difference data from N kinds of resolution image data and thumbnails. Specifically, the difference image generation unit 501 takes a difference between image data having a resolution Rm (m is an integer of 1 to N ⁇ 1, and the smaller m is, the higher the resolution is) and image data having a resolution Rm + 1. Thus, difference data of resolution Rm is generated. Also, the difference image generation unit 501 generates difference data of resolution RN by taking the difference between the image data of resolution RN and the thumbnail. The difference image generation unit 501 outputs N pieces of difference data to the image encoding unit 105.
  • the image encoding unit 105 performs compression encoding processing on each difference data output from the difference image generation unit 501 and outputs the result to the secret sharing processing unit 106. Also, the image encoding unit 105 performs compression encoding processing on the thumbnail resolution image data and outputs the result to the data combining unit 107.
  • the secret sharing processing unit 106 performs secret sharing processing on each differential data after the compression encoding process output from the image encoding unit 105, generates n shared data for each differential data, and generates a data combining unit It outputs to 107.
  • the resolution conversion unit 104 converts the resolution of the original image data, and generates N types of resolution image data and thumbnail resolution image data (S601).
  • the difference image generation unit 501 generates N pieces of difference data from the image data and thumbnails of N types of resolutions (S602).
  • the image encoding unit 105 performs compression encoding processing on each difference data and thumbnail (S603).
  • the secret sharing processing unit 106 performs secret sharing processing on the N pieces of differential data after compression encoding, and generates n pieces of shared data for each difference data (S604).
  • the data combining unit 107 combines the distributed data selected one by one so as not to overlap each difference data, and generates n pieces of combined data.
  • the thumbnail is added to all the combined data (S605).
  • image data and thumbnails of three types of resolution R1 (3840 ⁇ 2160 dots), resolution R2 (1920 ⁇ 1080 dots), and resolution R3 (640 ⁇ 480 dots) are generated.
  • difference data of resolution R1 which is a difference between image data of resolution R1 and image data of resolution R2
  • difference data of resolution R2 which is a difference between image data of resolution R2 and image data of resolution R3
  • difference data of resolution R3 that is a difference between image data of resolution R3 and a thumbnail is generated. Then, the difference data of each resolution is divided into four pieces of distributed data by the secret sharing process.
  • difference data of resolution R1 can be restored to the original difference data by using four pieces of distributed data.
  • the difference data of resolution R2 can be restored to the original difference data by using three pieces of distributed data.
  • the difference data of resolution R3 can be restored to the original difference data by using two pieces of distributed data.
  • the difference data between the thumbnail and the resolution R3 can be used to restore the image data with the resolution R3. Also, it is possible to restore the image data with the resolution R2 using the image data with the resolution R3 and the difference data with the resolution R2. Further, it is possible to restore the image data of the resolution R1 using the image data of the resolution R2 and the difference data of the resolution R1.
  • thumbnails are combined with the shared data 1-1, 2-1, 3-1 selected so as not to overlap from the resolutions R1, R2, and R3, and stored in the storage 22-1 Is done.
  • the thumbnails are combined with the distributed data 1-2, 2-2, and 3-2 selected one by one so as not to overlap from the resolutions R1, R2, and R3, and are stored in the storage 22-2.
  • the distributed data 1-3, 2-3, 3-3 selected one by one so as not to overlap from the resolutions R1, R2, R3 and the thumbnail are combined and stored in the storage 22-3, and each resolution R1, R2 , R3 and the shared data 1-4, 2-4, 3-4 selected one by one so as not to overlap, and the thumbnail are combined and stored in the storage 22-4.
  • receiving apparatus 33a Next, the internal configuration of receiving apparatus 33a according to the present embodiment will be described with reference to FIG. In the receiving apparatus 33a shown in FIG. 12, parts common to the receiving apparatus 33 shown in FIG.
  • the data separation unit 303 separates the distributed data and thumbnails instructed by the control unit 302 from the combined data, outputs the distributed data to the secret sharing restoration unit 304, and outputs the thumbnails to the image decoding unit 305.
  • the secret sharing restoration unit 304 performs secret sharing restoration processing on the shared data output from the data separation unit 303, and outputs the restored difference data (hereinafter referred to as “restored difference data”) to the image decoding unit 305. . Note that the difference data restored by the secret sharing restoration unit 304 is in an encoded state.
  • the image decoding unit 305 performs a decoding process corresponding to the compression encoding of the image encoding unit 105 on the thumbnail output from the data separation unit 303 and the restored difference data output from the secret sharing restoration unit 304, and performs the difference
  • the image is output to the image composition unit 701.
  • the difference image composition unit 701 performs composition processing on the thumbnail and the restoration difference data output from the image decoding unit 305, and generates restored image data that can be viewed by the user.
  • the secret sharing restoration unit 304 performs a secret sharing restoration process on the distributed data of each resolution.
  • the number k of the distributed data necessary for the secret sharing restoration process varies depending on each resolution, and the lower the resolution, the smaller the number of necessary distributed data.
  • the image decoding unit 305 performs a decoding process, and generates thumbnails and restoration difference data (S802, S803).
  • the difference image composition unit 701 performs composition processing on the thumbnail and the restored difference data to generate restored image data that can be viewed by the user (S804).
  • the restored image data generated by the difference image composition unit 701 is displayed on the display 34.
  • the processing performed by the receiving device 33a may be performed in the mobile terminal 32 or the personal computers 35 and 36.
  • a plurality of difference data is generated from a plurality of image data having different resolutions, and n pieces of difference data (n is an integer of 3 or more, It is possible to restore the original difference data by dividing into the distributed data having the same value in the difference data and using k pieces (k is an integer of 2 to n and different from each other for each difference data).
  • k is an integer of 2 to n and different from each other for each difference data.
  • the secret sharing process is performed, and the pieces of distributed data selected one by one so as not to overlap from each resolution are combined to generate n pieces of combined data, and each piece of combined data is stored in different storages.
  • the more distributed data is collected, the higher the resolution of the image data can be reproduced, and the security for copyright, privacy, etc. can be ensured in each distributed data.
  • the processing performed by the video management server 21 may be performed by the personal computer 13 or the like. Further, the processing performed by the receiving device 33 may be performed by the mobile terminal 32 or the personal computers 35 and 36.
  • the storage 22-i may be a cloud storage, or a part of on-premises server storage or storage of a personal computer, a camera, or a mobile terminal may be used.
  • the video management server 21 may select the distributed data necessary for the restoration and transmit it to the receiving devices 33 and 33a.
  • the receiving device 33 or 33a may select the necessary shared data and download it from the storage 22-i.
  • a configuration is shown in which distributed data selected one by one so as not to overlap from each resolution is combined as a file, but as a group without combining these distributed data as files,
  • a configuration may be adopted in which distributed data of each group is stored in different storages. In this configuration, if the storage that can be accessed is managed based on the user's authority or the like, the same effect as when files are combined can be obtained.
  • This disclosure is suitable for use in an image processing system for distributing and managing video data in a secret manner.
  • Video / Content Creation Unit 20 Video / Content Storage Unit 21, 21a Video Management Server 22 Storage 30 Video / Content Browsing Unit 33, 33a Reception Device 101, 301 Data Reception Unit 102 Storage Unit 103, 302 Control Unit 104 Resolution Conversion Unit 105 Image encoding unit 106 Secret sharing processing unit 107 Data combining unit 108, 306 Data transmission unit 303 Data separation unit 304 Secret sharing restoration unit 305 Image decoding unit 501 Difference image generation unit 701 Difference image synthesis unit

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Graphics (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Storage Device Security (AREA)
  • Television Signal Processing For Recording (AREA)
PCT/JP2015/005939 2014-12-05 2015-11-30 管理装置及び画像処理システム Ceased WO2016088347A1 (ja)

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EP3229465A4 (en) 2017-12-06
EP3229465A1 (en) 2017-10-11
EP3229465B1 (en) 2022-01-05
US10230997B2 (en) 2019-03-12
US20170318316A1 (en) 2017-11-02
JP2016111511A (ja) 2016-06-20

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