JP4778484B2 - Image processing apparatus and program - Google Patents

Description

  The present invention relates to an image processing apparatus and program, and more particularly to an image processing apparatus and program having a function of recording encrypted content data.

  In order to protect the copyright of content such as images, recording is performed after the content is encrypted. However, in order to edit the encrypted content, it is necessary to first decrypt the encrypted content, edit the decrypted content, and then re-encrypt the edited content. For this reason, editing of the encrypted content takes a long time, and a high-performance and expensive processor is required to perform the processing at high speed. As an example of editing the encrypted content, the encrypted content is recorded after encrypting and recording the content in, for example, MPEG-2 Transport Stream (TS) format obtained by receiving the digital broadcast. May be edited.

For example, a method for scrambling and descrambling MPEG stream data is proposed in Patent Document 1, and a video information retrieval method is proposed in Patent Document 2. Also, Patent Document 3 proposes a method of scrambling encoded data excluding the VOP start code in a section where security is set in order to protect image copyright while suppressing the occurrence of redundant data. .
JP-A-10-336624 JP 11-1112913 A JP 2001-203684 A

  Conventionally, the editing of encrypted content always involves a decryption process, so that there is a problem that it takes a long processing time.

  SUMMARY An advantage of some aspects of the invention is that it provides an image processing apparatus and program capable of editing encrypted content in a relatively short processing time without accompanying a decryption process.

  The above problem is to detect a start code indicating the start or end of specific data from content data before recording the encrypted content and insert an edit information packet into the content data based on the detected start code. An insertion unit; an encryption unit for encrypting at least a part of the content data other than the editing information packet when the content data is recorded; and the content data encrypted by the encryption unit together with the editing information packet This can be achieved by an image processing apparatus comprising a recording means for storing in a recording medium.

  The above-described problem is a program that causes a computer to perform image processing, and allows the computer to detect a start code indicating the start or end of specific data from content data before recording the content by encrypting the content. An insertion procedure for inserting an edit information packet into content data with reference to the start code, and encryption for encrypting at least a part of the content data other than the edit information packet when recording the content data in the computer The present invention can be achieved by a program including a procedure and a recording procedure for causing the computer to store content data encrypted by the encryption procedure together with an editing information packet in a recording medium.

  According to the present invention, it is possible to realize an image processing apparatus and program capable of editing encrypted content in a relatively short processing time without accompanying a decryption process.

  In the present invention, before the content having the video or visual (Video or Visual) format defined by MPEG-2 Video or MPEG-4 is encrypted and recorded, the start indicating the start or end of the specific data from the content data is started. The code is detected, and an edit information packet is inserted into the content data with reference to the detected start code. This editing information packet includes a content ID, a point ID, a link information recording area, and the like. When recording the content data, all or a part of the content data other than the editing information packet, that is, at least a part of the content data other than the editing information packet is encrypted and stored in the recording medium together with the editing information packet.

  When editing the recorded content data, the link destination content ID and the link destination point ID are written as link information in the link information recording area of the editing information packet stored in the recording medium together with the content data.

  When reproducing the edited content data, the editing information packet stored in the recording medium is extracted, the content data is selected based on the link information written in the link information recording area of the editing information packet, The selected content data is decrypted and reproduced as one continuous content.

  As described above, since the encrypted content is edited without decrypting the content data, the editing process can be performed in a relatively short processing time.

  Embodiments of an image processing apparatus and a program according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing the main part of the image processing apparatus in the first embodiment of the present invention. In FIG. 1, the flow of content data is indicated by solid arrows, and the exchange of control data is indicated by broken arrows. In FIG. 1 and FIG. 6 to be described later, illustration of storage means such as a memory for storing data such as a program executed by a processor such as a CPU and intermediate data of an operation executed by the CPU is omitted for the sake of convenience.

  The image processing apparatus 10-1 includes a CPU 11, an insertion unit 12, an encryption / decryption unit 13, a CPU 14, a recording unit 15, an editing unit 16, and a reproduction unit 17 that are connected as illustrated in FIG. The CPU 11, the insertion unit 12, the encryption / decryption unit 13, the CPU 14, the recording unit 15, the editing unit 16, and the reproduction unit 17 constitute a device such as a single board, module, or semiconductor device (or semiconductor chip). In this embodiment, the receiving unit 1 and the recording medium 21 are externally connected to the image processing apparatus 10-1. However, at least one of the receiving unit 1 and the recording medium 21 is provided in the image processing apparatus 10-1. Also good. The recording medium 21 may be a semiconductor storage device or a storage device using a magnetic recording medium represented by a disk, an optical recording medium, a magneto-optical recording medium, or the like.

  The CPU 11 controls the receiving unit 1, the inserting unit 12, and the encryption / decryption unit 13. The receiving unit 1 is hardware constituting reception means for receiving content data to be encrypted and recorded. The content encrypted at the time of recording has a video or visual format defined by, for example, MPEG-2 Video or MPEG-4. In the present embodiment, the receiving unit 1 has a configuration for receiving, for example, a digital broadcast wave and outputting content data in the MPEG-2 transport stream (TS) format, but content data in the MPEG-2 TS format. May be directly received.

  The insertion unit 12 detects a start code indicating the start or end of specific data from the content data received by the receiving unit 1 before encrypting and recording the content, and edit information packets based on the detected start code Is hardware that constitutes an insertion means for inserting the content into the content data.

  FIG. 2 is a block diagram illustrating a configuration of the insertion unit 12. In FIG. 2, illustration of exchange of control data between the CPU 11 and the insertion unit 12 is omitted. The insertion unit 12 includes a start code detection unit 121 and a packet insertion unit 122 which are connected as shown in FIG. The content data received by the receiving unit 1 is input to the start code detecting unit 121. In this embodiment, since the receiving unit 1 receives MPEG-2 TS, the start code detecting unit 121 detects an arbitrary start code included in the TS packet, and when this arbitrary start code is detected, the packet inserting unit A start code detection notification is sent to 122.

  FIG. 3 is a diagram illustrating the structure of a TS packet. As shown in FIG. 3, a TS packet includes a TS header and a payload, and the TS header has a configuration conforming to ISO / IEC 13818-1. The appearance position of the start code is variable in the payload.

  In response to the start code detection notification from the start code detection unit 121, the packet insertion unit 122 inserts the edit information packet into the TS packet received by the reception unit 1.

  FIG. 4 is a diagram showing the configuration of the edit information packet. As shown in FIG. 4, the edit information packet includes a TS header and edit information, and the TS header has a configuration conforming to ISO / IEC 13818-1. The PID value in the TS header is set to an arbitrary value, and the edit information packet can be distinguished from other TS packets by this PID value. The editing information includes a content ID, a point ID, and a link information recording area, and the link information recording area includes a link destination content ID, a link point ID, and a reserved area.

  The encryption / decryption unit 13 includes all or a part of content data other than the editing information packet to be recorded at the time of recording, that is, encryption means for encrypting at least a part of the content data other than the editing information packet, and editing at the time of reproduction. This is hardware constituting decryption means for decrypting recorded encrypted content data based on link information in the information packet. The encryption and decryption method used in the encryption and decryption unit 13 may be any method and is not particularly limited.

  The CPU 14 controls the recording unit 15, the editing unit 16, and the playback unit 17. The recording unit 15 constitutes recording means for recording the content data by storing at least a part of the content data other than the editing information packet encrypted by the encryption and decryption unit 13 together with the editing information packet at the time of recording. Software. The editing unit 16 includes an editing unit that writes link information in an editing information packet stored in the recording medium 21 together with the encrypted content data when the encrypted content data recorded in the recording medium 21 is edited. It is software to configure. For example, the editing unit 16 writes the link destination content ID and the link destination point ID as link information in the link information recording area of the edit information packet. When reproducing the recorded content data, the reproducing unit 17 extracts and reads out the editing information packet stored in the recording medium 21 and reads the link destination written in the link information recording area of the editing information packet. This is software that constitutes playback means for selecting and reading out encrypted content data stored in the recording medium 21 based on link information including a content ID and a link destination point ID. Therefore, even if the recorded content data is edited, it is encrypted and edited by selecting the content data encrypted based on the link information of the editing information packet and reading it from the recording medium 21. Content data can be read out. The encrypted content data selected by the reproduction unit 17 is decrypted by the encryption and decryption unit 13 constituting the decryption means and reproduced as one continuous content. The reproduction unit 17 reproduces the MPEG-2 TS format. It is output after being decoded into the same format as the digital broadcast wave similar to that received by the receiving unit 1 from the content data, and displayed on an external display device (not shown). As described above, the content data encrypted by the reproduction unit 17 and the encryption / decryption unit 13 is selectively read out and reproduced as one continuous content even if edited.

  Needless to say, the recording unit 15, the editing unit 16, and the playback unit 17 may be configured by hardware.

  FIG. 5 is a block diagram showing the configuration of the encryption / decryption unit 13. In FIG. 5, illustration of control data exchange between the CPU 11 and the encryption / decryption unit 13 is omitted. The encryption / decryption unit 13 includes an encryption / decryption target packet filtering unit 131 and an encryption / decryption processing unit 132 which are connected as shown in FIG. At the time of recording, the encryption / decryption target packet filtering unit 131 supplies the encryption / decryption processing unit 132 with content data excluding the editing information packet among the content data to be recorded with the edit information packet obtained from the insertion unit 12 inserted. Then, the editing information packet is output by bypassing the encryption / decryption processing unit 132, whereby the content data to be recorded is encrypted and output from the encryption / decryption unit 13. On the other hand, at the time of reproduction, the encryption / decryption target packet filtering unit 131 encrypts the edit information packet read from the recording medium 21 obtained from the reproduction unit 17 and the encrypted content data excluding the edit information packet. The content data is supplied to the encryption / decryption processing unit 132, and the editing information packet is output by bypassing the encryption / decryption processing unit 132, whereby the encrypted content data to be reproduced is decrypted and encrypted and decrypted. Output from the unit 13.

  FIG. 6 is a block diagram showing the main part of the image processing apparatus in the second embodiment of the present invention. In FIG. 6, the same parts as those in FIG. In FIG. 6, the flow of content data is indicated by solid arrows, and the white arrows indicate buses.

  In the image processing apparatus 10-2 shown in FIG. 6, a single CPU 24 performs the same control as the two CPUs 11 and 14 in the first embodiment, and functions of the recording unit 15, the editing unit 16, and the playback unit 17. Have The image processing apparatus 10-2 includes a receiving unit 1. The image processing apparatus 10-2 is configured by a single semiconductor device (or semiconductor chip).

  In this embodiment, since a single processor is used, the receiving unit is included in the image processing apparatus. However, as in the first embodiment, the configuration of the image processing apparatus is relatively simple and relatively inexpensive. Can be manufactured.

  FIG. 7 is a block diagram showing a main part of the image processing apparatus in the third embodiment of the present invention. In FIG. 7, the same parts as those in FIG. In FIG. 7, the flow of content data is indicated by solid arrows, and the exchange of control data is indicated by broken arrows.

  The image processing apparatus 10-3 includes a control unit 31, an insertion unit 12A, an encryption / decryption unit 13A, a recording unit 15A, an editing unit 16A, and a reproduction unit 17A configured by software, and can be configured by a processor. The functions of the control unit 31, the insertion unit 12A, the encryption / decryption unit 13A, the recording unit 15A, the editing unit 16A, and the playback unit 17A are the CPUs 11 and 14, the insertion unit 12, the encryption / decryption unit 13, and the recording unit shown in FIG. 15, the functions of the editing unit 16 and the playback unit 17 are the same.

  In this embodiment, since the image processing apparatus is configured by only a single processor, the configuration of the image processing apparatus is relatively simple and can be manufactured at a relatively low cost.

  Next, operations during recording, editing and reproduction in the first to third embodiments will be described with reference to FIGS.

  FIG. 8 is a flowchart for explaining the operation during recording. In FIG. 8, step S1 is executed by the receiving unit 1, steps S2 to S4 are executed by the inserting unit 11 (or 11A), steps S5 and S6 are executed by the encryption and decryption unit 13 (or 13A), and step S7. , S8 is executed by the recording unit 15 (or 15A).

  In FIG. 8, step S1 receives MPEG-2 TS format digital broadcast waves, and performs well-known analog / digital conversion (ADC) processing and demodulation processing to output MPEG-2 TS format content data. .

  Step S2 detects a start code from the content data, and step S3 determines whether or not a target start code has been detected. If the decision result in the step S3 is NO, the process advances to a step S5 described later. On the other hand, if the decision result in the step S3 is YES, a step S4 inserts an edit information packet into the content data at a timing triggered by the detected start code, and the process advances to a step S5.

  In step S5, it is determined whether the processing target is data to be encrypted among the content data in which the editing information packet is inserted. If the determination result is NO, the process proceeds to step S7 described later. If the decision result in the step S5 is YES, the data to be encrypted is encrypted.

  In step S7, the encrypted content data and the unencrypted editing information packet are stored in the recording medium 21. In step S8, it is determined whether or not storage into the recording medium 21, that is, video recording is completed. If the determination result is NO, the process returns to step S1, and if the determination result is YES, the process ends.

  FIG. 9 is a flowchart for explaining the operation during editing. In FIG. 9, steps S11 to S16 are executed by the editing unit 16 (or 16A).

  In step S11, the content data recorded from the recording medium 21, that is, the encrypted content data and the unencrypted editing information packet are read out. In step S12, the editing information packet is searched from the read content data. In step S13, it is determined whether the content data is a packet to be edited from the searched editing information packet. If the determination result is NO, the process proceeds to step S15 described later. On the other hand, if the decision result in the step S13 is YES, the step S14 edits the edit information packet by writing the link destination content ID and the link destination point ID as link information in the link information recording area of the edit information packet. The process proceeds to step S15. In step S15, it is determined whether editing of the editing information packet has been completed. If the determination result is NO, the process returns to step S12. If the decision result in the step S15 is YES, a step S16 stores the edited edit information packet in the recording medium 21, and the process ends.

  FIG. 10 is a flowchart for explaining the operation during reproduction. In FIG. 10, steps S21 to S26 are executed by the playback unit 17 (or 17A), step S27 is executed by the encryption and decryption unit 13 (or 13A), and steps S28 and S29 are executed by the playback unit 17 (or 17A). Is done.

  In FIG. 10, step S21 reads content data recorded from the recording medium 21, that is, encrypted content data and an unencrypted editing information packet. In step S22, the editing information packet is searched from the read content data. A step S23 decides whether or not the link destination information is written in the searched edit information packet. If the decision result in the step S23 is YES, a step S24 sets the reading destination of the recording medium 21 based on the link destination content ID and the link destination point ID included in the link destination information, and the processing is performed in the step S21. Return to. On the other hand, if the decision result in the step S23 is NO, a step S25 reads subsequent recorded data, that is, encrypted content data from the recording medium 21, and the process advances to a step S26.

  In step S26, a request to decrypt the recorded data read from the recording medium 21, that is, the encrypted content data, is sent to the encryption and decryption unit 13 (or 13A), and in step S27, the read encryption is performed. The converted content data is decrypted. In step S28, the decoded content data in the MPEG-2 TS format is decoded and output in the same format as that received by the receiving unit 1, and is displayed on an external display device (not shown). Is done. In step S29, it is determined whether the reproduction of the recorded data read from the recording medium 21 is completed. If the determination result is NO, the process returns to step S21, and if the determination result is YES, the process ends.

  FIG. 11 is a diagram showing a start code of MPEG-2 Video. In each of the above embodiments, the start code detected by the insertion unit 12 (or 12A) may be a start code as shown in FIG. 11 when the content data has an MPEG-2 video or visual format. In this case, “00 00 01 (hexadecimal)” is added to each 32-bit start code value as a prefix as defined in ISO / IEC 13818-2.

  FIG. 12 shows an MPEG-4 start code. In each of the above embodiments, the start code detected by the insertion unit 12 (or 12A) may be a start code as shown in FIG. 12 when the content data has an MPEG-4 video or visual format.

  The start code to be detected from the content data is not limited to the above start code as long as the start code indicates the start or end of the specific data.

In addition, this invention also includes the invention attached to the following.
(Appendix 1)
Inserting means for detecting a start code indicating the start or end of specific data from content data and inserting an edit information packet into the content data based on the detected start code before recording the content encrypted;
An encryption means for encrypting at least a part of the content data other than the editing information packet when recording the content data;
An image processing apparatus comprising: recording means for storing content data encrypted by the encryption means together with an editing information packet in a recording medium.
(Appendix 2)
Appendix 1 further comprising editing means for writing link information into the editing information packet stored in the recording medium together with the content data when editing the content data recorded in the recording medium. The image processing apparatus described.
(Appendix 3)
The edit information packet includes a content ID, a point ID, and a link information recording area,
The image processing apparatus according to appendix 2, wherein the editing means writes a link destination content ID and a link destination point ID as the link information in a link information recording area of the edit information packet.
(Appendix 4)
When reproducing edited content data, the edit information packet stored in the recording medium is extracted, and the content data is selected based on the link information written in the link information recording area of the edit information packet Playback means to
The image processing apparatus according to claim 2, further comprising: a decoding unit that decodes the content data selected by the reproducing unit and reproduces the content data as one continuous content.
(Appendix 5)
The image processing apparatus according to appendix 4, wherein the recording unit, the editing unit, and the reproducing unit are configured by a single processor.
(Appendix 6)
The image processing apparatus according to any one of appendices 1 to 5, wherein the encrypted content has a video or visual format defined by MPEG-2 Video or MPEG-4.
(Appendix 7)
The image processing apparatus according to any one of appendices 1 to 6, further comprising the recording medium.
(Appendix 8)
The image processing apparatus according to any one of appendices 1 to 7, further comprising receiving means for receiving the encrypted content.
(Appendix 9)
A program for causing a computer to perform image processing,
Insertion procedure for causing the computer to detect a start code indicating the start or end of specific data from content data and to record an edit information packet into the content data based on the detected start code before recording the content with encryption When,
An encryption procedure for causing the computer to encrypt at least a part of the content data other than the editing information packet when recording the content data;
A recording procedure for causing the computer to store content data encrypted by the encryption procedure together with an editing information packet in a recording medium.
(Appendix 10)
An editing procedure for causing the computer to write link information in the editing information packet stored in the recording medium together with the content data when editing the content data recorded in the recording medium; The program according to appendix 9.
(Appendix 11)
The edit information packet includes a content ID, a point ID, and a link information recording area,
The program according to claim 10, wherein the editing means causes the computer to write a link destination content ID and a link destination point ID as the link information in a link information recording area of the edit information packet.
(Appendix 12)
When reproducing the edited content data, the computer extracts the editing information packet stored in the recording medium, and based on the link information written in the link information recording area of the editing information packet Playback procedure for selecting content data,
The program according to appendix 10, further comprising: a decoding procedure for causing the computer to decode the content data selected by the reproduction procedure and reproduce it as one continuous content.
(Appendix 13)
13. The program according to any one of appendices 9 to 12, wherein the content to be encrypted has a video or visual format defined by MPEG-2 Video or MPEG-4.
(Appendix 14)
14. The program according to any one of appendices 9 to 13, further comprising a reception procedure for causing the computer to receive the content to be encrypted.
(Appendix 15)
A computer-readable storage medium, wherein the program according to any one of appendices 9 to 14 is stored.

  While the present invention has been described with reference to the embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications and improvements can be made within the scope of the present invention.

It is a block diagram which shows the principal part of the image processing apparatus in 1st Example of this invention. It is a block diagram which shows the structure of an insertion part. It is a figure which shows the structure of TS packet. It is a figure which shows the structure of an edit information packet. It is a block diagram which shows the structure of an encryption and a decoding part. It is a block diagram which shows the principal part of the image processing apparatus in 2nd Example of this invention. It is a block diagram which shows the principal part of the image processing apparatus in 3rd Example of this invention. It is a flowchart explaining the operation | movement at the time of video recording. It is a flowchart explaining the operation | movement at the time of editing. It is a flowchart explaining the operation | movement at the time of reproduction | regeneration. It is a figure which shows the start code of MPEG-2 Video. It is a figure which shows the start code of MPEG-4.

Explanation of symbols

1 Receiving Units 10-1, 10-2 Image Processing Device 10-3 Image Processing Software 11, 14, 24 CPU
12, 12A Insertion unit 13, 13A Encryption and decryption unit 15, 15A Recording unit 16, 16A Editing unit 17, 17A Playback unit 21 Recording medium

Claims (6)

Inserting means for detecting a start code indicating the start or end of specific data from content data and inserting an edit information packet into the content data based on the detected start code before recording the content encrypted;
An encryption means for encrypting at least a part of the content data other than the editing information packet when recording the content data;
An image processing apparatus comprising: recording means for storing content data encrypted by the encryption means together with an editing information packet in a recording medium.   An editing means for writing link information in the editing information packet stored in the recording medium together with the content data when editing the content data recorded in the recording medium. The image processing apparatus according to 1. The edit information packet includes a content ID, a point ID, and a link information recording area,
3. The image processing apparatus according to claim 2, wherein the editing unit writes a link destination content ID and a link destination point ID as the link information in a link information recording area of the edit information packet. When reproducing edited content data, the edit information packet stored in the recording medium is extracted, and the content data is selected based on the link information written in the link information recording area of the edit information packet Playback means to
The image processing apparatus according to claim 2, further comprising: a decoding unit that decodes the content data selected by the reproduction unit and reproduces the content data as one continuous content.   5. The image processing apparatus according to claim 1, wherein the content to be encrypted has a video or visual format defined by MPEG-2 Video or MPEG-4. A program for causing a computer to perform image processing,
Insertion procedure for causing the computer to detect a start code indicating the start or end of specific data from content data and to record an edit information packet into the content data based on the detected start code before recording the content with encryption When,
An encryption procedure for causing the computer to encrypt at least a part of the content data other than the editing information packet when recording the content data;
A recording procedure for causing the computer to store content data encrypted by the encryption procedure together with an editing information packet in a recording medium.

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