JP2008160264A - Contents duplication abnormality detection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a content duplication abnormality detection apparatus capable of quickly detecting an abnormality in duplicated contents with high reliability. <P>SOLUTION: The content duplication abnormality detection apparatus is provided with: a first comparing data storage means 104 for storing I picture data extracted from compressed duplication source content data; a comparing data identification information management means 105 for collecting address information in duplication source content data of respective stored I picture data and storing the collected address information as comparing data identification information; a second comparing data storage means 108 for storing the I picture data extracted from the duplicated content data according to the address information of the comparing data identification information; a comparison means 109 for comparing the I picture data stored in the first comparing data storage means 104 with that stored in the second comparing data storage means 108; and an output information generation means 110, when a difference is detected as the result of comparison, generating picture information for displaying an image of the I picture data in which the difference is detected on the same picture. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a content duplication abnormality detecting device for detecting duplication abnormality of copied digital content data.

  In recent years, large-capacity recording media such as DVD (Digital Versatile Disc) and HDD (Hard Disc Drive) have been widely used as media for recording digital content data such as video and audio.

  Digital content data recorded on these recording media can be operated from a DVD to a DVD-R (Digital Versatile Disc Recordable), from a DVD-R to a DVD-R, or by a user operating a recording device having a duplication function. It is possible to copy from HDD to DVD-R.

  However, at the end of the duplication process, the user cannot determine whether or not the digital content data has been successfully duplicated. Even if the user reproduces the duplicated content data and notices an abnormality, the duplication source content data May have already been deleted.

  As an apparatus for detecting an abnormality in a recording medium such as a DVD-R, there is a disk evaluation apparatus described in Patent Document 1.

The disk evaluation apparatus described in Patent Document 1 can quantitatively and automatically evaluate the quality state of a disk by performing surface blur amount measurement, servo gain measurement, jitter measurement, RF level measurement, error rate measurement, and the like. Is possible.
Japanese Utility Model Publication No. 6-11122

  However, the disk evaluation apparatus described in Patent Document 1 is expensive and difficult for general users to obtain.

  In addition, this disc evaluation apparatus can detect abnormalities relating to the physical characteristics of the recording medium, but cannot detect abnormalities in the recorded content data itself. There is a problem that it cannot be determined unless the content data is reproduced.

  In addition, there is a problem that it takes a long time to compare the content data before duplication with the content data after duplication in order to determine whether or not the duplication is successful.

  The present invention has been made in view of the above circumstances, and is a content duplication abnormality detection device that can be easily used by general users and can detect anomalies of copied content with high reliability and high speed. The purpose is to provide.

  In order to achieve the above object, a content duplication abnormality detecting device (10) according to the present invention duplicates content data encoded by the MPEG2 system read from a duplication source disk recording medium to a duplication destination disc recording medium. In this case, it is determined whether or not the content data has been normally copied, and the first content data input for inputting the first content data read from the copy source disk recording medium Means (101), extraction condition storage means (102) for storing extraction conditions for extracting I picture stream data from the first content data input to the first content data input means (101), According to the extraction conditions stored in the extraction condition storage means (102), the first content data input means (101 The first comparison data extraction means (103) for extracting the I picture stream data from the first content data input from the above, and the I picture stream data extracted by the first comparison data extraction means (103) are stored Address information in the first content data of each I picture stream data stored in the first comparison data storage means (104) and the first comparison data storage means (104) is collected and stored as comparison data identification information Comparison data identification information management means (105), second content data input means (106) for inputting second content data read from the copy destination disc recording medium, and comparison data identification information management According to the address information of the comparison data identification information stored in the means (105), 2 extracted by the second comparison data extraction means (107) for extracting I picture stream data from the second content data input from the content data input means (106) and the second comparison data extraction means (107) Second comparison data storage means (108) for storing the I picture stream data, I picture stream data stored in the first comparison data storage means (104), and storage in the second comparison data storage means (108). The comparison means (109) for comparing the I picture stream data thus obtained, and the I picture stream data stored in the first comparison data storage means (104) as a result of comparison in the comparison means (109) and the second A difference is detected between the I picture stream data stored in the comparison data storage means (108). When the difference is detected, the image of the I picture stream data stored in the first comparison data storage means (104) in which the difference is detected and the I picture stored in the second comparison data storage means (108) Output information generating means (110) for generating screen information for displaying an image of stream data on the same screen is provided.

  According to the content duplication abnormality detection device of the present invention, it can be easily used by general users, and an abnormality of the copied content can be detected with high reliability and high speed.

<Configuration of Content Duplication Anomaly Detection Device According to One Embodiment>
A configuration of a recording apparatus 1 having a content duplication abnormality detection apparatus 10 according to an embodiment of the present invention will be described with reference to FIGS.

  The recording device 1 according to the present embodiment includes a content duplication abnormality detection device 10, a first DVD drive 20, a duplication unit 30, and a second DVD drive 40.

  The content duplication abnormality detection apparatus 10 includes a first buffer (first content data input unit) 101, an extraction condition storage unit 102, a first comparison data extraction unit 103, a first comparison data storage unit 104, and comparison data identification. An information management unit 105, a second buffer (second content data input unit) 106, a second comparison data extraction unit 107, a second comparison data storage unit 108, a comparison unit 109, and an output information generation unit 110 Have.

  The first buffer 101 acquires and reproduces the first video / audio data 201 stored in the DVD-ROM inserted in the first DVD drive 20 described later by acquiring a duplication instruction operated by the user.

  The extraction condition storage unit 102 stores extraction conditions for data extracted from the copy source content data in order to compare the copy source content data with the copied content data.

  An example of the extraction conditions stored in the extraction condition storage means 102 is shown in FIG.

  In FIG. 2, the extraction condition is that the type of data to be extracted is I picture stream data in the content data compressed by the MPEG2 system, and the comparison accuracy is “low”, “medium”, and “high”. The extraction frequency of the I picture stream data is every 120 seconds when the comparison accuracy is “low”, every 60 seconds when the comparison accuracy is “medium”, and every 30 seconds when the comparison accuracy is “high”. It is set to be.

  Which of the three types of comparison accuracy to use is selected in advance by the user.

  The first comparison data extraction unit 103 receives the first I picture stream data that is I picture stream data in the first video / audio data 201 stored in the first buffer 101 in accordance with the extraction conditions stored in the extraction condition storage unit 102. , Extracted from the first video / audio data 201.

  The first comparison data accumulating means 104 accumulates the first I picture stream data extracted from the first video / audio data 201 by the first comparison data extracting means 103, and is a recording medium such as an HDD in the recording apparatus 1. A semiconductor memory device is used.

  The comparison data identification information management means 105 collects address information in the first video / audio data 201 of each first I picture stream data accumulated in the first comparison data accumulation means 104 to create a table, and uses it as comparison data identification information. Remember.

  The second buffer 106 reads and accumulates second video / audio data 401 recorded on a DVD-R inserted in a second DVD drive 40 described later.

  The second comparison data extraction unit 107 is configured to output the I picture stream data in the second video / audio data 401 stored in the second buffer 106 according to the address information of the comparison data identification information stored in the comparison data identification information management unit 105. The second I-picture stream data is extracted from the second video / audio data 401.

  The second comparison data accumulating means 108 accumulates the second I picture stream data extracted from the second video / audio data 401 by the second comparison data extracting means 107, and is a recording medium such as an HDD in the recording apparatus 1. A semiconductor memory device is used.

  The comparison unit 109 compares the first I picture stream data stored in the first comparison data storage unit 104 with the second I picture stream data stored in the second comparison data storage unit 108.

  The output information generation unit 110 generates output information for displaying the result compared by the comparison unit 109 on an external monitor or the like.

  The first DVD drive 20 inserts a DVD-ROM in which the first video / audio data 201 as the first content data which is the content data of the copy source is encoded and recorded by the MPEG2 system.

  The duplicating means 30 duplicates the first video / audio data 201 stored in the first buffer 101 to generate second video / audio data 401 as second content data, which is the content data after duplication. 2 Write to the DVD-R inserted in the DVD drive 40.

  The second DVD drive 40 inserts a DVD-R into which the second video / audio data 401 is written in the duplicating means 30.

<Operation of Content Duplication Anomaly Detection Device According to One Embodiment>
The operation of the content duplication abnormality detection device 10 according to the present embodiment will be described with reference to FIGS.

  First, when a copy instruction for the first video / audio data 201 is input by the user's operation (S1), the first video / audio is compressed and stored in the DVD-ROM inserted in the first DVD drive 20 by the MPEG2 method. Data 201 is sequentially read and accumulated in the first buffer 101 (S2).

  Next, the first video / audio data 201 stored in the first buffer 101 is sequentially duplicated by the duplication unit 30 to generate second video / audio data (S3), and the first comparison data extraction unit 103 extracts the first video / audio data 201. The first I picture stream data is extracted from the first video / audio data 201 stored in the first buffer 101 in accordance with the extraction conditions as shown in FIG. 2 stored in the condition storage means 102 (S4).

  In this embodiment, “low” is selected as the comparison accuracy in FIG. 2 in advance by the user, and the first I picture stream data is extracted every 120 seconds.

  The first I picture stream data is a frame image encoded without referring to another P picture or B picture among picture types (I picture, P picture, B picture) constituting video data compressed by the MPEG2 system. Data, which is the reference image data of an MPEG2 video stream that holds all the image information of one sheet.

  Here, the first video / audio data 201 is data obtained from a DVD-ROM, and the first I-picture stream data is extracted from the first video / audio data 201 using a structure based on the DVD-Video standard.

  The structure of video / audio data stored in a DVD-ROM based on the DVD-Video standard will be described with reference to FIGS.

  As shown in FIG. 4, the audio / video data stored in the DVD-ROM is stored in a directory structure in which file names and directory names are designated in advance so that the DVD player can easily access them.

  The data stored in each DVD-ROM includes one video manager (VMG) 51 that stores information on the entire disc and menu information common to all titles, and n pieces (n is 1 or more) that stores information on each title. 99 or less) video title sets (VTS) 52-1 to 52-n.

  Each video title set (VTS) 52-1 to 52-n includes video object sets (VOBS) 53-1 to 53-n, which are video / audio stream data portions of the video title. In the first buffer 101 and the second buffer 106, the video object set (VOBS) 53 of the corresponding title is read.

  The structure of each video object set (VOBS) 53 is shown in detail in FIG.

  The video object set (VOBS) 53 is composed of a plurality of video objects (VOB) 54, each video object (VOB) 54 is composed of a plurality of cells 55, and each cell is composed of a plurality of video object units (VOBU) 56. Has been.

  Each video object unit (VOBU) 56 starts with a navigation pack (NV_PCK) 57 in which information for managing the video object unit (VOBU) 56 is recorded, and a video pack (V_PCK) 58 in which main video data is recorded, and audio data. A recorded audio pack (A_PCK) 59 and a sub-picture pack (SP_PCK) 60 in which sub-picture data such as subtitles are recorded.

  The structure of the video object unit (VOBU) 56 is shown in detail in FIG.

  The navigation pack (NV_PCK) 57 in the video object unit (VOBU) 56 is composed of a pack header 61, a system header 62, a program control information packet (PCI_PKT) 63, and a data search information packet (DSI_PKT) 64. The data search information packet (DSI_PKT) 64 includes DSI data 65 in which information used for trick modes represented by DVD forward scan and back scan is described. Used to extract I picture stream data.

  The structure of the DSI data 65 is shown in detail in FIG.

  The DSI data 65 includes VOBU search information (VOBU_SRI) 66 and DSI general information (DSI_GI) 67.

  The VOBU search information (VOBU_SRI) 66 describes the start address of a VOBU that is reproduced at each time from 120 seconds before to 120 seconds before the reproduction start time of the video object unit (VOBU) 56 including the DSI data 65. It enables high-speed forward scan and back scan.

  The DSI general information (DSI_GI) 67 includes the end address (VOBU_1STREF_EA) 68 of the first reference picture of the VOBU.

  The end address (VOBU_1STREF_EA) 68 of the first reference picture of this VOBU is the address of the video pack (V_PCK) 58 in which the final data of the I picture is recorded, and the video object unit (in which the DSI data 65 is recorded) VOBU) 56 is described by a relative logical block value (Relative Logical Block Number) from the first logical block (Logical Block).

  With reference to FIGS. 6, 8, and 9, the operation when the I comparison stream extracting unit 103 extracts the I picture stream data every 120 seconds from the first video / audio data 201 having the above-described structure will be described. explain.

  First, a VOBU start address 69 indicating the start address of the video object unit (VOBU) 56 is acquired from the VOBU search information (VOBU_SRI) 66 (S21).

  Next, a value obtained by adding 2048 bytes (one sector) of the navigation pack (NV_PCK) 57 to the acquired VOBU head address 69 is calculated as the start address 70 of the I picture (S22).

  Next, the end address (VOBU_1STREF_EA) 68 of the first reference picture of VOBU is extracted (S23).

  Next, a value obtained by adding the end address (VOBU_1STREF_EA) 68 of the first reference picture of the VOBU to the start address 70 of the I picture is calculated as the end address 71 of the I picture (S24).

  Next, a video pack (V_PCK) 58 of I picture stream data is extracted by specifying the I picture start address 70 calculated in step S22 and the I picture end address 71 calculated in step S24. (S25).

  If the header portion of the video pack (V_PCK) 58 is further removed from the I picture stream data, only the video data area is extracted.

  Next, if the first video / audio data 201 has not been completed (“NO” in S26), the VOBU head indicating the head address of the video object unit (VOBU) 56 after 120 seconds from the VOBU search information (VOBU_SRI) 66. The address 69 is acquired (S27).

  When the VOBU head address 69 is acquired in step S27, the process returns to step S22, the I picture stream data is acquired again, and the process is repeated until the first video / audio data 201 is completed (“YES” in S26).

  By the above processing, only the first I picture stream data is extracted from the first video / audio data 201 at high speed.

  Returning to the flowchart of FIG. 3, the first I picture stream data extracted in step S4 is stored in the first comparison data storage means 104 (S5).

  Next, in the comparison data identification information management means 105, the address information in the first video / audio data 201 of the first I picture stream data accumulated and accumulated in the first comparison data accumulation means 104 is collected to create a table, It is stored as comparison data identification information (S6).

  An example of the comparison data identification information created by the comparison data identification information management means 105 is shown in FIG.

  As shown in FIG. 10, the VOBU head address 69 calculated during the extraction of each first I picture stream data by the first comparison data extraction means 103, the start address 70 of the I picture, and the first reference picture of the VOBU. The end address (VOBU_1STREF_EA) 68 and the end address 71 of the I picture are acquired by the comparison data identification information management means 105, and a table of comparison data identification information is generated and stored.

  On the other hand, the second video / audio data 401 generated by duplicating the first video / audio data 201 in step S3 is sequentially written and stored in the DVD-R inserted in the second DVD drive 40 (S7).

  Next, the second video / audio data 401 stored in the DVD-R inserted in the second DVD drive 40 is sequentially read and accumulated in the second buffer 106 (S8).

  Next, the start address of each I picture of the comparison data identification information stored in the comparison data identification information management means 105 in the second comparison data extraction means 107 from the second video / audio data 401 accumulated in the second buffer 106. The second I picture stream data is extracted in accordance with 70 and the end address 71 of the I picture (S9).

  Here, as shown in FIG. 11, since the start address 70 of each I picture and the end address 71 of the I picture of the comparison data identification information are referred to, direct access is made in the second video / audio data 401. The second I picture stream data is extracted at high speed.

  The extracted second I picture stream data is stored in the second comparison data storage means 108 (S10).

  Next, the comparison means 109 compares the first I picture stream data stored in the first comparison data storage means 104 with the second I picture stream data stored in the second comparison data storage means 108 (S11).

  As a result of the comparison by the comparison means 109, when it is determined that the first I picture stream data and the second I picture stream data are not equal (“NO” in S12), the first video / audio data 201 of the copy source and the post-duplication Output information composed of information indicating that there is a difference with the second video / audio data 401 and a button for selecting whether or not to display the details of the comparison result is generated by the output information generation means 110 (S13). For example, as shown in FIG. 12 or FIG. 13, it is output to a display device such as an external monitor.

  When displaying the details of the comparison result (“Yes” button) in FIG. 12 or 13 is selected by the user (“YES” in S14), the first I picture stream data at the point where the difference is confirmed is duplicated. Information that is displayed as the original image and the second I picture stream data at the point where the difference has been confirmed is displayed as an image after duplication, and output information that is configured to select whether to perform duplication processing again. Is generated by the output information generating means 110 (S15) and output to an external monitor or the like as shown in FIG. 14, for example.

  Since the I picture stream data used for the comparison is frame video data encoded without referring to data of other picture types (P picture, B picture), it can be displayed as shown in FIG. Is possible.

  In FIG. 14, the displayed original image or the post-duplication image may be a still image of only the point where the difference is confirmed, or a moving image continuously played before the point where the difference is confirmed. Further, the range on the image affected by the difference may be clearly displayed.

  In FIG. 14, when the user selects that the duplication process is performed again (“Yes” button) (“YES” in S16), the process returns to step S2, and the duplication process and normality of the first video / audio data 201 are performed again. A determination process for determining whether or not duplication has been performed is performed.

  In FIG. 14, when the user selects to perform the duplication process again (“NO” button) (“NO” in S16), the process is terminated.

  In addition, when it is selected not to display the details of the comparison result (“No” button) in FIG. 12 or 13 (“YES” in S14), the process proceeds to Step S16.

  Further, when it is determined that the first I picture stream data and the second I picture stream data are equal as a result of the comparison by the comparison means 109 (“YES” in S12), the first video / audio data 201 of the duplication source and the post-duplication The output information generation means 110 generates output information indicating that the dubbing process has been performed normally without any difference from the second video / audio data 401 (S17). For example, as shown in FIG. Output to the display device.

  According to the above-described embodiment, when the video / audio data of the DVD is duplicated, the structure of the DVD video standard is used to determine whether the video / audio data is normally duplicated at high speed with a simple device configuration. can do.

  Further, when there is a difference between the original video / audio data and the post-duplication video / audio data, the user can visually grasp the influence of the video due to the difference.

  In addition, since the duplication is re-executed when there is a difference between the original video / audio data and the post-duplication video / audio data, the valuable video / audio data can be reliably stored in a normal state.

  In addition, the fact that the user cannot recognize the failure despite the fact that the replication has actually failed can prevent a situation in which the replication source data is deleted.

It is a block diagram which shows the structure of the recording device which has a content duplication abnormality detection apparatus by one Embodiment of this invention. It is explanatory drawing which shows an example of the extraction conditions memorize | stored in the extraction condition memory | storage means of the content duplication abnormality detection apparatus by one Embodiment of this invention. It is a flowchart which shows operation | movement of the content duplication abnormality detection apparatus by one Embodiment of this invention. It is explanatory drawing which shows the structure of the audiovisual data stored in DVD-ROM utilized with the content duplication abnormality detection apparatus by one Embodiment of this invention. FIG. 5 is an explanatory diagram showing the structure of a video object set in video / audio data stored in the DVD-ROM of FIG. 4. It is explanatory drawing which shows the structure of the video object unit in the video object set of FIG. It is explanatory drawing which shows the structure of the DSI data in the video object unit of FIG. It is explanatory drawing which shows operation | movement when 1st I picture stream data is extracted in the content duplication abnormality detection apparatus by one Embodiment of this invention. 6 is a flowchart illustrating an operation when the first I picture stream data is extracted by the content duplication abnormality detection device according to the embodiment of the present invention. It is explanatory drawing which shows an example of the comparison data identification information memorize | stored in the comparison data identification information management means of the content duplication abnormality detection apparatus by one Embodiment of this invention. It is explanatory drawing which shows the operation | movement of the extraction process in the 2nd comparison data extraction means of the content duplication abnormality detection apparatus by one Embodiment of this invention. It is a screen display figure which shows an example when the output information when abnormality is detected in the replication produced | generated by the output information production | generation means of the content duplication abnormality detection apparatus by one Embodiment of this invention is displayed. It is a screen display figure which shows an example when the output information when abnormality is detected in the replication produced | generated by the output information production | generation means of the content duplication abnormality detection apparatus by one Embodiment of this invention is displayed. It is a screen display figure which shows an example when the output information of the detail of an abnormality produced | generated by the output information production | generation means of the content duplication abnormality detection apparatus by one Embodiment of this invention is displayed. It is a screen display figure which shows an example when the output information when the duplication was performed normally produced | generated by the output information production | generation means of the content duplication abnormality detection apparatus by one Embodiment of this invention is displayed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Recording apparatus 10 ... Content duplication abnormality detection apparatus 20 ... 1st DVD drive 30 ... Duplication means 40 ... 2nd DVD drive 51 ... Video manager (VMG)
52 ... Video title set (VTS)
53 ... Video object set (VOBS)
54 ... Video object (VOB)
55 ... Cell 56 ... Video Object Unit (VOBU)
57… Navigation pack (NV_PCK)
58 ... Video Pack (V_PCK)
59 ... Audio pack (A_PCK)
60 ... Sub-picture pack (SP_PCK)
61 ... Pack header 62 ... System header 63 ... Program control information packet (PCI_PKT)
64 ... Data search information packet (DSI_PKT)
65 ... DSI data 66 ... VOBU search information (VOBU_SRI)
67 ... DSI general information (DSI_GI)
68 ... End address of the first reference picture (VOBU_1STREF_EA)
69 ... VOBU start address 70 ... I picture start address 71 ... I picture end address 101 ... first buffer 102 ... extraction condition storage means 103 ... first comparison data extraction means 104 ... first comparison data storage means 105 ... comparison data Identification information management means 106 ... second buffer 107 ... second comparison data extraction means 108 ... second comparison data storage means 109 ... comparison means 110 ... output information generation means 201 ... first video / audio data 401 ... second video / audio data

Claims (1)

It is determined whether or not the content data has been normally copied when the content data encoded by the MPEG2 method read from the copy source disk recording medium is copied to the copy destination disk recording medium. In the content duplication abnormality detection device,
First content data input means for inputting first content data read from the copy source disc recording medium;
Extraction condition storage means for storing extraction conditions for extracting I picture stream data from the first content data input to the first content data input means;
First comparison data extraction means for extracting I picture stream data from the first content data input from the first content data input means in accordance with the extraction conditions stored in the extraction condition storage means;
First comparison data storage means for storing the I picture stream data extracted by the first comparison data extraction means;
Comparison data identification information management means for collecting address information in the first content data of each I picture stream data accumulated in the first comparison data accumulation means and storing the address information as comparison data identification information;
Second content data input means for inputting second content data read from the copy destination disc recording medium;
Second comparison data for extracting I picture stream data from the second content data input from the second content data input means according to the address information of the comparison data identification information stored in the comparison data identification information management means Extraction means;
Second comparison data storage means for storing the I picture stream data extracted by the second comparison data extraction means;
Comparing means for comparing the I picture stream data stored in the first comparison data storage means with the I picture stream data stored in the second comparison data storage means;
When a difference is detected between the I picture stream data stored in the first comparison data storage means and the I picture stream data stored in the second comparison data storage means as a result of the comparison in the comparison means The image of the I picture stream data stored in the first comparison data storage means in which this difference is detected and the image of the I picture stream data stored in the second comparison data storage means are displayed on the same screen. Output information generating means for generating screen information for display;
A content duplication abnormality detection device comprising:

Images