WO2006001646A1 - Digital motion picture recording device and method for the preservation of evidence - Google Patents

Digital motion picture recording device and method for the preservation of evidence

Info

Publication number
WO2006001646A1
WO2006001646A1 PCT/KR2005/001957 KR2005001957W WO2006001646A1 WO 2006001646 A1 WO2006001646 A1 WO 2006001646A1 KR 2005001957 W KR2005001957 W KR 2005001957W WO 2006001646 A1 WO2006001646 A1 WO 2006001646A1
Authority
WO
WIPO (PCT)
Prior art keywords
investigated
digital video
investigator
watermark
video
Prior art date
Application number
PCT/KR2005/001957
Other languages
French (fr)
Inventor
Jin Hun Kim
Original Assignee
Udworks Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Udworks Co., Ltd. filed Critical Udworks Co., Ltd.
Publication of WO2006001646A1 publication Critical patent/WO2006001646A1/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
    • H04N9/8205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00137—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to contents recorded on or reproduced from a record carrier to authorised users
    • G11B20/00144—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to contents recorded on or reproduced from a record carrier to authorised users involving a user identifier, e.g. a unique customer ID
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00884—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a watermark, i.e. a barely perceptible transformation of the original data which can nevertheless be recognised by an algorithm
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10527—Audio or video recording; Data buffering arrangements
    • G11B2020/10537—Audio or video recording
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus
    • H04N5/77—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera
    • H04N5/772—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera the recording apparatus and the television camera being placed in the same enclosure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
    • H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction

Definitions

  • the present invention relates to an apparatus and method for recording digital motion picture(or, video) to be preserved as evidence, and more particularly, to an apparatus and method for recording digital video to be preserved as evidence by capturing video of a process of investigating the investigated and appending a tag that stores information regarding an investigator and the investigated to the captured video, thereby allowing the content of the investigation to be easily detected and used as evidence in a further investigation or a trial.
  • Background Art Conventionally, when a policeman or a public prosecutor investigates a suspect or a party concerned, the investigation is recorded only in the form of a report and the report is executed by the suspect or the party concerned so that the report can be used as an important evidence in a trial.
  • the investigated responds to questions of the investigator (the policeman, the public prosecutor, etc.), the in ⁇ vestigator records the questions and the responses in a document, and then, the in ⁇ vestigator and the investigated appends their signatures and seals to the document to authenticate the document and the content of the document.
  • the in ⁇ vestigator and the investigated appends their signatures and seals to the document to authenticate the document and the content of the document.
  • threats, violence, or fraudulent acts are often used to receive the in ⁇ vestigator's deposition during an investigation, and thus, audio and video of the in ⁇ vestigation are recorded to prevent this problem.
  • video is recorded using a general camera, a closed circuit television (CCTV), a video recorder, and so on.
  • CCTV closed circuit television
  • DVR digital video recorder
  • the DRV is advantageous in that it allows only moving pictures to be stored and stored video to be conveniently and immediately detected according to time and location.
  • a public prosecutor for example, questions the investigated in a public place where a great number of people can use, it is difficult to detect video of an investigation of a specific case from a great amount of data unless a separate storage device for each investigator (or investigated) is installed.
  • Video of an investigation can be used as important evidence in a trial, and therefore, an apparatus that guarantees security for the video is urgently required to prevent in ⁇ formation regarding the investigator and the investigated and the content of the video from being modified or deleted.
  • the present invention provides an apparatus and method for recording digital video to be preserved as evidence by capturing digital video of a process of investigating the investigated and appending a tag that stores information regarding an investigator and the investigated to the digital video, thereby allowing video of an investigation regarding a specific case (or, the digital video) to be easily detected.
  • the present invention also provides an apparatus and method for recording digital video to be preserved as evidence by embedding a watermark generated from the fin ⁇ gerprints of an investigator and the investigated into the digital video of an in ⁇ vestigation, thereby preventing the digital video from being exported, forged, and altered.
  • the present invention also provides an apparatus and method for recording digital video to be preserved as evidence by compressing and storing the digital video of an investigation in an MPEGl format, an MPEG2 format, or an MPEG4 format, thereby allowing the digital video to be easily stored and transmitted.
  • Advantageous Effects [10] Accordingly, according to the present invention, it is possible to easily detect video of an investigation by inputting information regarding the investigated and an in ⁇ vestigator. [11] Also, it is possible to prevent video from being forged and altered by embedding a watermark generated from the fingerprints of an investigator and the investigated into the video. [12] Also, it is possible to increase the efficiency of storing and transmitting video by compressing the video. Brief Description of the Drawings [13] FIG.
  • FIG. 1 is a block diagram illustrating an apparatus for recording video according to an embodiment of the present invention
  • FIG. 2 is a flowchart illustrating a method of recording video according to an embodiment of the present invention.
  • Best Mode for Carrying Out the Invention [15] According to an aspect of the present invention, there is provided an apparatus for capturing video of a process of investigating the investigated, using a camera and a microphone, the apparatus including a fingerprint input unit that takes the fingerprints of an investigator and the investigated; an analog-to-digital (AfD) converter that combines a video signal and an audio signal received from the camera and the microphone, respectively, and converts the result of combining into digital video; a user information database that stores user information of the investigator and the in ⁇ vestigated; a tag generation unit that reads out the user information, generates a tag allowing the digital video to be detected, and appends the tag to the digital video; and a compression unit that compresses the digital video appended with the tag.
  • AfD analog-to-digital
  • the apparatus further includes a watermark generation module that generates a specific pattern for each of the investigator and the investigated from the received fin ⁇ gerprints and makes a watermark using the specific patterns; a watermark database that stores information regarding the watermark; a watermark embedding unit that embeds the watermark into the digital video; and a video information database that stores the compressed digital video.
  • the user information includes at least one of identification information regarding the investigator and the investigated, the date of the investigation, the place of the in ⁇ vestigation, and a case number.
  • the compression unit compresses the digital video in an MPEGl format, an MPEG2 format, or an MPEG4 format.
  • a method of capturing video of a process of investigating the investigated, using a camera and a microphone including storing user information of an investigator and the investigated when the user information is received; operating the camera and the microphone when the fingerprints of the investigator and the investigated are received from a fingerprint input unit; combining a video signal and an audio signal received from the camera and the microphone, respectively, and converting the result of combining into digital video; reading out the user information, generating a tag that allows the digital video to be detected, from the user information, and appending the tag to the digital video; and compressing and storing the digital video appended with the tag.
  • the method further includes generating a specific pattern for each of the in ⁇ vestigator and the investigated from the fingerprints and generating a watermark using the specific patterns; storing information regarding the watermark; and embedding the watermark into the digital video.
  • the user information includes at least one of identification information regarding the investigator and the investigated, the date of the investigation, the place of the in ⁇ vestigation, and a case number.
  • the compressed digital video has an MPEGl format, an MPEG2 format, or an MPEG4 format.
  • Mode for the Invention [23]
  • FlG. 1 is a block diagram of a video recoding apparatus 100 according to an embodiment of the present invention (hereinafter referred to as "recording apparatus 100").
  • the recording apparatus 100 includes a camera 102, a microphone 104, an analog-to-digital (AJO) converter 106, a fingerprint input unit 108, a watermark generation module 110, a watermark database 112, a watermark embedding unit 114, a user information database 116, a tag generation unit 118, a compression unit 120, and a video information database 122.
  • AJO analog-to-digital
  • the camera 102 and the microphone 104 convert video and audio of an investigator and the investigated into an analog video signal and an analog audio signal, re ⁇ spectively.
  • the A/D converter 106 combines the video signal and the audio signal received from the camera 102 and the microphone 104, respectively, and converts the result of combining into digital video data.
  • the fingerprint input unit 108 takes the fingerprints of the investigator and the in ⁇ vestigated, and includes an image sensor (not shown), such as a charge-coupled device (CCD), that recognizes the patterns of the fingerprints.
  • the fingerprint input unit 108 includes elements such as a light emitting unit, a photo sensor, and a signal converter, and determines the shape of each fingerprint by sensing light reflected according to the valley of each fingerprint.
  • the watermark generation module 110 makes a detecting key by generating specific patterns from the fingerprints of the investigator and the investigated, and makes a watermark using the specific patterns.
  • Watermarking is a well-known technology in which information that only an author can identify is inserted into various types of digital works, such as an image, audio, and video, such that it is possible to determine whether each digital work is canceled, copied, or altered.
  • the watermark can be generated from an autograph or a seal of the author, or an image. According to the present embodiment, the watermark is generated based on the patterns of the fin ⁇ gerprints of the investigator and the investigated.
  • the watermark database 112 stores information regarding the watermark.
  • the watermark embedding unit 114 embeds the watermark into the digital video data.
  • the watermark may be embedded into a frequency region or a spatial region of the digital video.
  • the watermark is embedded into the special region of the digital video, it is possible to immediately complete embedding the watermark but the watermark is not robust to compression of the digital video. In contrast, if the watermark is embedded into the frequency region, the watermark is robust to the compression of the digital video but an embedding algorithm requires a great amount of time to embed the watermark. Thus, it is difficult to transmit a large amount of video frames in real time.
  • whether the watermark will be embedded into a spatial region or a frequency region of video is selectively determined after de ⁇ termining whether transmission of the video in real-time or transmission of stored video is required.
  • the user information database 116 stores user information of the investigator and the investigated.
  • the user information preferably includes information regarding the investigator and the investigated (their names, company names, titles, etc.), and the in ⁇ vestigation (investigation date and place, case number, etc.) so that the investigator, the investigated, and the investigation can be identified.
  • the user information allows an in ⁇ vestigation process regarding a specific case to be easily detected from data stored in the recording apparatus 100 that has been used by a plurality of users.
  • the tag generation unit 118 appends a tag that stores the user information of the in ⁇ vestigator and the investigated to the digital video data stored in the recording apparatus 100.
  • the compression unit 120 compresses the digital video data to which the tag is appended.
  • the compressed digital video data has an MPEGl format, an MPEG2 format, or an MPEG4 format.
  • the compressed digital video data preferably has the MPEG4 format that guarantees a high compression rate and easy transmission.
  • the video information database 122 stores the digital video data into which the tag is appended and the watermark is embedded. Upon a request for transmission of the digital video data, the digital video data is detected and transmitted from the video in ⁇ formation database 122.
  • the operations of the elements of the recording apparatus 100, such as video recording, transmission, and conversion, are well known to those of ordinary skill in the art, and therefore, a detailed description thereof will be omitted here.
  • FIG. 2 is a flowchart of a method of recording video according to an embodiment of the present invention. Referring to FIGS.
  • user information of an in ⁇ vestigator and the investigated is input to the recording apparatus 100 via an input unit (not shown) such as a keyboard, a touch pad, or a mouse, and stored in the user in ⁇ formation database 116 (S 102).
  • the user information regarding the investigator may be input by contacting a card reader with a magnetic card or a smart card that contains the user information.
  • the fingerprint input unit 108 the fingerprints are perceived and patterns of the fingerprints are transformed into a digital signal (S 104).
  • the camera 102 and the microphone 104 begin to operate to capture video of an investigation process (S 106). A video signal and an audio signal captured are converted into digital video data and temporarily stored.
  • the watermark generation module 110 generates specific patterns from the input fingerprints of the investigator and the investigated to make a detecting key, and generates a watermark using the specific patterns (S 108 and Sl 10).
  • the tag generation unit 108 reads out the user information of the investigator and the investigated from the user information database 116, generates a tag to store the read user information, and appends the tag to the temporarily stored digital video data(S112).
  • the watermark embedding unit 114 embeds the watermark generated from the fin ⁇ gerprints of the investigator and the investigated into the digital video regarding the in ⁇ vestigation process (Sl 14). As described above, the watermark is embedded into a frequency region or a spatial region of the digital video.
  • a position of the digital video to which the watermark is embedded is not limited.
  • the compression unit 120 compresses the digital video data into which the tag is appended and the watermark is embedded in a proper format, and stores it in the video information database 122.
  • All the user information and their fingerprints must be input to reproduce the digital video of the investigation process stored in the video information database 122. If the digital video is reproduced by inputting the fingerprints of one of the investigator and the investigated, a general party concerned can forge or alter the digital video. To prevent this, reproduction of the digital video must be restricted to when all the user in ⁇ formation and the fingerprints of the investigator and the investigated are input.
  • the digital video may be reproduced by inputting the fingerprints of one of the investigator and the investigated.
  • the compressed digital video data is uncompressed and transformed in a format in which the digital video data can be reproduced. Also, the watermark embedded into the digital video is detected to read in ⁇ formation regarding the investigator and the investigated. Therefore, it is possible to conveniently search for video of a process of investigating a specific case.
  • the present invention has been described with respect to an in ⁇ vestigation process in a police station or a prosecution, but is applicable to a conference of a company or a community, consultation in a customer center or a call center, or civil affair consultation in a government office. That is, video of a conference/consultation process can be recorded such that the video can be detected using information regarding a conference participant or the consulted when re ⁇ production of the video is required later.
  • video of a conference/consultation process can be recorded such that the video can be detected using information regarding a conference participant or the consulted when re ⁇ production of the video is required later.

Abstract

Provided is an apparatus for capturing video of a process of investigating the investigated, using a camera and a microphone. The apparatus includes a fingerprint input unit taking the fin¬ gerprints of an investigator and the investigated; an analog -to-digital (A/D) converter combining a video signal and an audio signal received from the camera and the microphone, respectively, and transforming the result of combining into digital video data; user information database storing user information of the investigator and the investigated; a tag generation unit reading the user information, generating a tag allowing the digital video to be detected, and appending the tag to the digital video; and a compression unit compressing the digital video to which the tag is appended. When the fingerprints of the investigator and the investigated are input from the fingerprint input unit, the camera and the microphone begin to operate. Accordingly, it is possible to easily detect video of an investigation process by inputting information regarding an investigator and the investigated.

Description

Description
DIGITAL MOTION PICTURE RECORDING DEVICE AND
METHOD FOR THE PRESERVATION OF EVIDENCE Technical Field [1] The present invention relates to an apparatus and method for recording digital motion picture(or, video) to be preserved as evidence, and more particularly, to an apparatus and method for recording digital video to be preserved as evidence by capturing video of a process of investigating the investigated and appending a tag that stores information regarding an investigator and the investigated to the captured video, thereby allowing the content of the investigation to be easily detected and used as evidence in a further investigation or a trial. Background Art [2] Conventionally, when a policeman or a public prosecutor investigates a suspect or a party concerned, the investigation is recorded only in the form of a report and the report is executed by the suspect or the party concerned so that the report can be used as an important evidence in a trial. That is, the investigated (a suspect, etc.) responds to questions of the investigator (the policeman, the public prosecutor, etc.), the in¬ vestigator records the questions and the responses in a document, and then, the in¬ vestigator and the investigated appends their signatures and seals to the document to authenticate the document and the content of the document. [3] However, threats, violence, or fraudulent acts are often used to receive the in¬ vestigator's deposition during an investigation, and thus, audio and video of the in¬ vestigation are recorded to prevent this problem. [4] Conventionally, video is recorded using a general camera, a closed circuit television (CCTV), a video recorder, and so on. However, recently, use of a digital video recorder (DVR) that converts and stores video into a digital signal has been widely spread. The DRV is advantageous in that it allows only moving pictures to be stored and stored video to be conveniently and immediately detected according to time and location. [5] However, since a public prosecutor, for example, questions the investigated in a public place where a great number of people can use, it is difficult to detect video of an investigation of a specific case from a great amount of data unless a separate storage device for each investigator (or investigated) is installed. [6] Video of an investigation can be used as important evidence in a trial, and therefore, an apparatus that guarantees security for the video is urgently required to prevent in¬ formation regarding the investigator and the investigated and the content of the video from being modified or deleted. Disclosure of Invention Technical Solution [7] The present invention provides an apparatus and method for recording digital video to be preserved as evidence by capturing digital video of a process of investigating the investigated and appending a tag that stores information regarding an investigator and the investigated to the digital video, thereby allowing video of an investigation regarding a specific case (or, the digital video) to be easily detected. [8] The present invention also provides an apparatus and method for recording digital video to be preserved as evidence by embedding a watermark generated from the fin¬ gerprints of an investigator and the investigated into the digital video of an in¬ vestigation, thereby preventing the digital video from being exported, forged, and altered. [9] The present invention also provides an apparatus and method for recording digital video to be preserved as evidence by compressing and storing the digital video of an investigation in an MPEGl format, an MPEG2 format, or an MPEG4 format, thereby allowing the digital video to be easily stored and transmitted. Advantageous Effects [10] Accordingly, according to the present invention, it is possible to easily detect video of an investigation by inputting information regarding the investigated and an in¬ vestigator. [11] Also, it is possible to prevent video from being forged and altered by embedding a watermark generated from the fingerprints of an investigator and the investigated into the video. [12] Also, it is possible to increase the efficiency of storing and transmitting video by compressing the video. Brief Description of the Drawings [13] FIG. 1 is a block diagram illustrating an apparatus for recording video according to an embodiment of the present invention; and [14] FIG. 2 is a flowchart illustrating a method of recording video according to an embodiment of the present invention. Best Mode for Carrying Out the Invention [15] According to an aspect of the present invention, there is provided an apparatus for capturing video of a process of investigating the investigated, using a camera and a microphone, the apparatus including a fingerprint input unit that takes the fingerprints of an investigator and the investigated; an analog-to-digital (AfD) converter that combines a video signal and an audio signal received from the camera and the microphone, respectively, and converts the result of combining into digital video; a user information database that stores user information of the investigator and the in¬ vestigated; a tag generation unit that reads out the user information, generates a tag allowing the digital video to be detected, and appends the tag to the digital video; and a compression unit that compresses the digital video appended with the tag. When the fingerprints of the investigator and the investigated are received from the fingerprint input unit, the camera and the microphone begin to operate. [16] The apparatus further includes a watermark generation module that generates a specific pattern for each of the investigator and the investigated from the received fin¬ gerprints and makes a watermark using the specific patterns; a watermark database that stores information regarding the watermark; a watermark embedding unit that embeds the watermark into the digital video; and a video information database that stores the compressed digital video. [17] The user information includes at least one of identification information regarding the investigator and the investigated, the date of the investigation, the place of the in¬ vestigation, and a case number. [18] The compression unit compresses the digital video in an MPEGl format, an MPEG2 format, or an MPEG4 format. [19] According to another aspect of the present invention, there is provided a method of capturing video of a process of investigating the investigated, using a camera and a microphone, the method including storing user information of an investigator and the investigated when the user information is received; operating the camera and the microphone when the fingerprints of the investigator and the investigated are received from a fingerprint input unit; combining a video signal and an audio signal received from the camera and the microphone, respectively, and converting the result of combining into digital video; reading out the user information, generating a tag that allows the digital video to be detected, from the user information, and appending the tag to the digital video; and compressing and storing the digital video appended with the tag. [20] The method further includes generating a specific pattern for each of the in¬ vestigator and the investigated from the fingerprints and generating a watermark using the specific patterns; storing information regarding the watermark; and embedding the watermark into the digital video. [21] The user information includes at least one of identification information regarding the investigator and the investigated, the date of the investigation, the place of the in¬ vestigation, and a case number. [22] The compressed digital video has an MPEGl format, an MPEG2 format, or an MPEG4 format. Mode for the Invention [23] FlG. 1 is a block diagram of a video recoding apparatus 100 according to an embodiment of the present invention (hereinafter referred to as "recording apparatus 100"). The recording apparatus 100 includes a camera 102, a microphone 104, an analog-to-digital (AJO) converter 106, a fingerprint input unit 108, a watermark generation module 110, a watermark database 112, a watermark embedding unit 114, a user information database 116, a tag generation unit 118, a compression unit 120, and a video information database 122. [24] The camera 102 and the microphone 104 convert video and audio of an investigator and the investigated into an analog video signal and an analog audio signal, re¬ spectively. The A/D converter 106 combines the video signal and the audio signal received from the camera 102 and the microphone 104, respectively, and converts the result of combining into digital video data. [25] The fingerprint input unit 108 takes the fingerprints of the investigator and the in¬ vestigated, and includes an image sensor (not shown), such as a charge-coupled device (CCD), that recognizes the patterns of the fingerprints. To recognize the fingerprints, the fingerprint input unit 108 includes elements such as a light emitting unit, a photo sensor, and a signal converter, and determines the shape of each fingerprint by sensing light reflected according to the valley of each fingerprint. [26] The watermark generation module 110 makes a detecting key by generating specific patterns from the fingerprints of the investigator and the investigated, and makes a watermark using the specific patterns. Watermarking is a well-known technology in which information that only an author can identify is inserted into various types of digital works, such as an image, audio, and video, such that it is possible to determine whether each digital work is canceled, copied, or altered. The watermark can be generated from an autograph or a seal of the author, or an image. According to the present embodiment, the watermark is generated based on the patterns of the fin¬ gerprints of the investigator and the investigated. [27] The watermark database 112 stores information regarding the watermark. [28] The watermark embedding unit 114 embeds the watermark into the digital video data. The watermark may be embedded into a frequency region or a spatial region of the digital video. If the watermark is embedded into the special region of the digital video, it is possible to immediately complete embedding the watermark but the watermark is not robust to compression of the digital video. In contrast, if the watermark is embedded into the frequency region, the watermark is robust to the compression of the digital video but an embedding algorithm requires a great amount of time to embed the watermark. Thus, it is difficult to transmit a large amount of video frames in real time. [29] According to the present invention, whether the watermark will be embedded into a spatial region or a frequency region of video is selectively determined after de¬ termining whether transmission of the video in real-time or transmission of stored video is required. [30] The user information database 116 stores user information of the investigator and the investigated. The user information preferably includes information regarding the investigator and the investigated (their names, company names, titles, etc.), and the in¬ vestigation (investigation date and place, case number, etc.) so that the investigator, the investigated, and the investigation can be identified. The user information allows an in¬ vestigation process regarding a specific case to be easily detected from data stored in the recording apparatus 100 that has been used by a plurality of users. [31] The tag generation unit 118 appends a tag that stores the user information of the in¬ vestigator and the investigated to the digital video data stored in the recording apparatus 100. The compression unit 120 compresses the digital video data to which the tag is appended. The compressed digital video data has an MPEGl format, an MPEG2 format, or an MPEG4 format. The compressed digital video data preferably has the MPEG4 format that guarantees a high compression rate and easy transmission. [32] The video information database 122 stores the digital video data into which the tag is appended and the watermark is embedded. Upon a request for transmission of the digital video data, the digital video data is detected and transmitted from the video in¬ formation database 122. The operations of the elements of the recording apparatus 100, such as video recording, transmission, and conversion, are well known to those of ordinary skill in the art, and therefore, a detailed description thereof will be omitted here. [33] FIG. 2 is a flowchart of a method of recording video according to an embodiment of the present invention. Referring to FIGS. 1 and 2, first, user information of an in¬ vestigator and the investigated is input to the recording apparatus 100 via an input unit (not shown) such as a keyboard, a touch pad, or a mouse, and stored in the user in¬ formation database 116 (S 102). The user information regarding the investigator may be input by contacting a card reader with a magnetic card or a smart card that contains the user information. [34] Next, when the investigator and the investigated input their fingerprints to the fingerprint input unit 108, the fingerprints are perceived and patterns of the fingerprints are transformed into a digital signal (S 104). [35] When the fingerprints are perceived, the camera 102 and the microphone 104 begin to operate to capture video of an investigation process (S 106). A video signal and an audio signal captured are converted into digital video data and temporarily stored. [36] The watermark generation module 110 generates specific patterns from the input fingerprints of the investigator and the investigated to make a detecting key, and generates a watermark using the specific patterns (S 108 and Sl 10). [37] The tag generation unit 108 reads out the user information of the investigator and the investigated from the user information database 116, generates a tag to store the read user information, and appends the tag to the temporarily stored digital video data(S112). [38] The watermark embedding unit 114 embeds the watermark generated from the fin¬ gerprints of the investigator and the investigated into the digital video regarding the in¬ vestigation process (Sl 14). As described above, the watermark is embedded into a frequency region or a spatial region of the digital video. In addition, if the same effect can be obtained, a position of the digital video to which the watermark is embedded is not limited. [39] The compression unit 120 compresses the digital video data into which the tag is appended and the watermark is embedded in a proper format, and stores it in the video information database 122. [40] All the user information and their fingerprints must be input to reproduce the digital video of the investigation process stored in the video information database 122. If the digital video is reproduced by inputting the fingerprints of one of the investigator and the investigated, a general party concerned can forge or alter the digital video. To prevent this, reproduction of the digital video must be restricted to when all the user in¬ formation and the fingerprints of the investigator and the investigated are input. However, if the digital video is manufactured such that a general party concerned can reproduce it by inputting his/her fingerprints but cannot forge or alter it, the digital video may be reproduced by inputting the fingerprints of one of the investigator and the investigated. [41] After receiving the compressed digital video, the compressed digital video data is uncompressed and transformed in a format in which the digital video data can be reproduced. Also, the watermark embedded into the digital video is detected to read in¬ formation regarding the investigator and the investigated. Therefore, it is possible to conveniently search for video of a process of investigating a specific case. [42] In this disclosure, the present invention has been described with respect to an in¬ vestigation process in a police station or a prosecution, but is applicable to a conference of a company or a community, consultation in a customer center or a call center, or civil affair consultation in a government office. That is, video of a conference/consultation process can be recorded such that the video can be detected using information regarding a conference participant or the consulted when re¬ production of the video is required later. [43] While this invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Industrial Applicability [44] The present invention is applicable to a computer readable medium that stores stages that run an apparatus and method for recording video.

Claims

Claims [1] An apparatus for capturing video of a process of investigating the investigated to preserve the video as evidence, using a camera and a microphone, the apparatus comprising: a fingerprint input unit taking fingerprints of an investigator and the investigated; an analog-to-digital converter combining a video signal and an audio signal received from the camera and the microphone, respectively, and transforming the result of combining into digital video; a user information database storing user information of the investigator and the investigated; a tag generation unit reading the user information, generating a tag which allows the digital video to be detected, and appending the tag to the digital video; and a compression unit compressing the digital video data to which the tag is appended, wherein when the fingerprints of the investigator and the investigated are received from the fingerprint input unit, the camera and the microphone begin to operate. [2] The apparatus of claim 1, further comprising: a watermark generation module generating a specific pattern for each of the in¬ vestigator and the investigated from the fingerprints received from the fingerprint input unit, and making a watermark using the specific patterns; a watermark database storing information regarding the watermark; a watermark embedding unit embedding the watermark into the digital video; and a video information database storing the compressed digital video data. [3] The apparatus of claim 1 or 2, wherein the user information comprises at least one of identification information of the investigator and the investigated, an in¬ vestigation data, an investigation place, and a case number. [4] The apparatus of claim 1 or 2, wherein the compression unit compresses the digital video in one of an MPEGl format, an MPEG2 format, and an MPEG4 format. [5] A method of capturing video of a process of investigating the investigated to preserve the video as evidence, using a camera and a microphone, the method comprising: when user information of an investigator and the investigated is input, storing the user information; operating the camera and the microphone when fingerprints of the investigator and the investigated are input from a fingerprint input unit; combining a video signal and an audio signal received from the camera and the microphone, respectively, and transforming the result of combining into digital video data; reading the user information, generating a tag which allows the digital video data to be detected, and appending the tag to the digital video data; and compressing and storing the digital video data to which the tag is appended. [6] The method of claim 5, further comprising: generating a specific pattern for each of the investigator and the investigated from the fingerprints and making a watermark using the specific patterns; storing information regarding the watermark; and embedding the watermark into the digital video data. [7] The method of claim 5 or 6, wherein the user information comprises at least one of identification information of the investigator and the investigated, an in¬ vestigation date, an investigation place, and a case number. [8] The method of claim 5 or 6, wherein the compressed digital video data is recorded in one of an MPEGl format, an MPEG2 format, and an MPEG4 format.
PCT/KR2005/001957 2004-06-25 2005-06-23 Digital motion picture recording device and method for the preservation of evidence WO2006001646A1 (en)

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