JP2008276891A - Video recording method and video recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video recording method and a video recording device by which a time and labor for backup operation by a photographer is eliminated by performing automatic division, and at the same time, one scene is automatically divided within a capacity of a backup destination without being divided in the middle, and thus backup can be performed conforming to the image of a user. <P>SOLUTION: When the recording end operation of video data are performed, previously specified division size information is compared with a present recording capacity, and when the present recording capacity exceeds a division size, stream data are divided into two parts at the ending position of the video data recorded previously, and management information is prepared for each stream. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention converts a video signal into digital data, and when recording on a large-capacity recording medium such as HDD (HARD DISK DRIVE) while compressing in MPEG (Moving Picture Expert Group) format, a small-capacity medium as a backup destination The present invention relates to a recording method and a recording apparatus that perform recording while dividing into a format that can be easily stored in a DVD (Digital Versatile Disk).

  In recent years, in place of DV (Digital Video) video cameras, video cameras using DVDs or HDDs as recording media have started to penetrate in order to improve convenience. This video camera using a new recording medium is a function that is not available on tape-type media, and it is possible to start recording without worrying about the data recording position. In addition, when playing from the beginning of the desired scene, in the case of a tape medium, it is necessary to send the tape to the beginning of the scene by fast-forwarding etc. and play it, but in the case of a recording medium such as a DVD or HDD, A function capable of easily reproducing desired data can be provided.

  However, there are DVDs and HDDs as such new media, but these media have a great difference in the recordable capacity and a great difference in the recordable time. HDDs are currently 1.8-inch HDDs that are optimal for use with video cameras, and those with more than 30 GB are the mainstream. Compared to this, the 8 cm DVD currently used for video cameras is 1.4 GB. Things are mainstream, and even those using two layers can record only a little time compared to 2.8 GB and HDD.

  In this way, it seems that using HDD as a recording medium is better than DVD, but HDD can record such a large amount of data for a long time, but the data recorded on the video camera. Is inconvenient compared to DVD when moving data out of the video camera. In other words, a video camera using a DVD as a recording medium can be played back simply by taking out the DVD disk and placing it in a compatible player after shooting.

  In addition, since standards are established, it is possible to easily edit shot images using a PC (Personal Computer) or the like. However, many video cameras using an HDD as a recording medium cannot prevent the HDD from being removed from the video camera in order to protect the HDD recording medium from impacts. Since the logical format of the video data to be recorded has not been prepared, it is inferior to playing back or editing video shot with other devices by removing media.

  Therefore, as a method for realizing convenience such as DVD with a video camera using a large-capacity recording medium such as HDD, the data in HDD is backed up in DVD format and converted to a format that can be played back by other players. It is possible to do. As such a method, for example, a method as disclosed in JP-A-2002-245717 is disclosed. This method will be briefly described below.

In Japanese Patent Laid-Open No. 2002-245717, for example, assuming that the backup target is a 12 cm DVD, the division size is 4.7 Gbytes, but the recording size is constantly monitored during recording so as to be within this size. When the division size exceeds or is likely to exceed the division size, the apparatus automatically divides the stream data so as to fall within the division size in units of GOP (Group Of Pictures).
JP 2002-245717 A

  However, in the conventional method, the stream is created in a size that can be stored in the backup destination media, which is convenient for backup, but only the recording size is regarded as important. For example, a person using a video camera When shooting one scene from the start of shooting to the end of shooting, if the division position is in the middle of one scene, the video will be divided in the middle of one scene. A situation occurs in which an image that a person thinks is one scene is separated into two DVDs at the backup destination.

The present invention is to solve such a conventional problem, and automatically divides and saves the trouble of the photographer's backup operation, and at the same time, the capacity of the backup destination without dividing one scene in the middle. It is an object of the present invention to provide a video recording method and a video recording apparatus, which are intended to be automatically backed up according to the user's image by being automatically divided within.

In order to solve the above problems, the video recording apparatus of the present invention compares the current recording capacity with the division size information for data division in a video recording apparatus that records and reproduces video data on a randomly accessible recording medium. A detection unit that detects a position where recording was previously stopped in the recording medium, a stream division unit that divides stream data at the position detected by the detection unit, and a management according to the position detected by the detection unit A management information editing unit that edits information, a stream control unit that generates stream data exceeding the division size information as a new stream, and a management that is generated as new management information for the stream data generated by the stream control unit An information generator, and the comparison unit compares the division size with the current recording capacity. When the recording capacity exceeds the division size information, the stream dividing unit divides the stream at the recording stop position detected by the detection unit, and the management information editing unit further detects the position detected by the detection unit. And the stream control unit generates stream data exceeding the division size information as a new stream, and the management information generation unit generates stream data generated by the stream control unit. For this, new management information is generated.
Further, in the video recording apparatus, the division size information is a capacity of a backup destination external medium when the recorded video data is backed up to an external medium, and is stored in the apparatus in advance, or It can be changed.

  Furthermore, in the video recording apparatus, the detection unit detects a scene that has been recorded last time based on the scene start information, the scene recording time, and the scene recording end time included in the management information, and simultaneously displays the scene on the stream data. It is characterized by detecting a scene for which the previous recording has been completed.

Furthermore, in the video recording apparatus, when the stream information is divided by the stream dividing unit, the management information editing unit changes the management information so that stream data with old time information can be reproduced. It is what.
Further, in the video recording apparatus, the management information creation unit creates management information for managing the stream data having a newer time created when the stream data is divided by the dividing unit. The management information of the stream managed before the division is reflected in the created management information, and the stream data with the newer time after the division is changed so that the stream data can be reproduced.

Further, in the video recording apparatus, when the size of one scene exceeds the division size information, the division unit selects to allow division within the size of the division size information In addition, when automatic division is possible, the image is automatically divided even in the middle of one scene.
Furthermore, in the video recording apparatus, the stream data is MPEG data.
Furthermore, in the video recording apparatus, the backup destination recording medium is a removable recording medium.

Furthermore, in the video recording apparatus, the stream data and the management information conform to the DVD-VR standard.
Also, in the video recording method, when recording of video data is terminated by a user operation, the division size information is compared with the current recording capacity, and the recording exceeds the division size information. Includes a detection step for detecting a position where recording has ended previously, a stream division step for dividing stream data at the position detected by the detection step, and editing to indicate that the management information of the stream data is also divided A management information editing step, a stream control step for recording from the position detected by the detection step to a portion recorded in excess of the division size information as a new data stream, and a newly divided data stream A management information creation step for newly creating management information It is an butterfly.

  Furthermore, in the video recording method, the detecting step may include, based on scene start information, scene recording time, and scene recording end time included in the management information of the stream data, a scene that has been recorded last time from the management information. Simultaneously with the detection, a scene in which the previous recording is completed is also detected on the stream data.

  Further, in the video recording method, in the management information editing step, when the stream data already existing in the recording medium is divided by the scene detected in the detection step, time information that can be divided is stored. The old stream data is changed and saved so that it can be reproduced.

  Further, in the video recording method, the management information creating step creates management information for managing the stream data having a newer time created when the stream data is divided by the dividing step. The management information of the stream managed before the division is reflected in the created management information, and the stream data with the newer time after the division is changed so that the stream data can be reproduced.

Further, in the video recording method, when the size of one scene exceeds the division size information, the division step selects to allow division within the size of the division size information In addition, when automatic division is possible, the image is automatically divided even in the middle of one scene.
Furthermore, in the video recording method, the stream data and the management information conform to the DVD-VR standard.

  As described above, according to the video recording apparatus and the video recording method of the present invention, it is possible to automatically divide and save the photographer's backup operation, and at the same time, the capacity of the backup destination without dividing one scene in the middle. Can be backed up according to the user's image.

  Embodiments of a video recording / reproducing method and a video recording apparatus according to the present invention will be described below in detail with reference to the drawings.

  FIG. 1 shows a diagram of a video recording apparatus in Embodiment 1 of the present invention.

  In FIG. 1, reference numeral 100 denotes a video camera equipped with a large-capacity recording medium such as an HDD which is an embodiment of the video recording apparatus of the present invention. The video camera 100 is mainly composed of the following components.

  First, the central processing unit 200 has a function of performing various calculations for video recording and controlling each device.

  Next, the bus 300 is a communication path through which the central processing unit 100 exchanges data while communicating with the memory 400, and the result calculated at that time flows. At the same time, not only data but also address information for controlling various devices normally flows.

  Next, a large-capacity recording medium 500 such as an HDD is used as the recording medium 500, and the digital signal converted from the analog data input from the video input unit 600 is calculated using the central processing unit 200 in the memory 400. This is a medium for storing (here, compression processing), and mainly MPEG data is recorded.

  The video input unit 600 may be a camera or a line input that can input an analog signal such as a television. In short, any data source may be used as long as it is stored as digital data compressed in the recording medium 500 and the digital data recorded on the recording medium 500 is reproduced later.

  Next, the video display unit 700 is a device such as a liquid crystal device for indicating information being processed to the user, and displays a video signal from the camera for compression, a recording time, a recording mode, and the like during video recording. In addition, when data in the recording medium 500 is reproduced, the image being reproduced and the reproduction time can be displayed. It is also possible to display a user interface for the user to select content data recorded during playback.

  The PC connection unit 800 is an interface for connecting to an external personal computer 1000 via a cable 900 and recording data in the recording medium using a DVD drive 1010 or the like that the personal computer 1000 can control. FIG. 2 provides a conceptual diagram when data is written to a DVD by connecting the video camera of the present invention and a personal computer.

  In addition, the memory 400 has a buffer memory for pre-reading a program for controlling the video camera and a stream, and includes a comparison unit 420, a stream control unit 430, a division unit 410, a detection unit 440, and management information editing. The component 450 and the management information policy west 460 are included. These components will be described later together with the method of implementing the present invention.

  FIG. 4 shows an example of a directory structure and a file structure of a hard disk as a recording medium used in the video camera of this embodiment. FIG. 4 shows a directory structure when the DVD-VR standard is used in this embodiment. The meaning is briefly explained below.

  ROOT 3001 indicates the logical uppermost layer in the file system in the hard disk. Although a directory named ROOT does not exist, it may exist.

  DISC1 (3011) and DISC2 (3021) correspond to backup destination disks when data in the hard disk is backed up to a DVD. In other words, if the folder structure below is directly backed up to a DVD, the DVD is recorded in accordance with the DVD standard and can be played back by another playback device. FIG. 4 describes an example of the DVD-VR standard. There is no problem even if the standard to be used is other than DVD-VR.

  DVD_RTAV (3012, 3022) is a folder defined by the DVD-VR standard, and must have this name. In the DVD-VR standard, a plurality of management files and data files are stored in this folder.

  VR_MANAGER. IFO (3014, 3024) is management information in which information for controlling video data is recorded. It is usually called an IFO file. Based on the information described in the IFO file, the player reproduces the data.

  VR_MANAGER. BUP (3013, 3023) is a backup of the IFO file backup described above. That is, the same information is normally recorded.

  VR_MOVIE. VRO (3015, 3025) is obtained by multiplexing actual video data and audio data. Video data and audio data can be separated by analyzing the above-mentioned IFO file. When the separated data is input to a video decoder or an audio decoder, the MPEG data is decoded and reproduction can be confirmed on the display unit 700.

  Next, a method of creating a directory as shown in FIG. 4 by recording data on the hard disk of the recording medium by the video camera of this embodiment will be described in detail with reference to the flowchart of FIG. It is assumed that only the directory structure below DISC1 (3011) is currently recorded in the hard disk 500, and the video data currently being shot is also stored in the DVD_RTAV (3012) directory in the DISC1 (3011) directory as needed. That is, the substance of data (video, audio) is VR_MOVIE. It is assumed that the IFO file that is recorded in the VRO and that is the management information and the backup file are also updated.

  First, in FIG. 3, step 2001 shows a process in which MPEG data accumulated by the stream control unit 430 in the memory 400 is recorded on the hard disk 500.

  Step 2002 determines whether or not the user has pressed the shooting stop button. If the shooting stop button has not been pressed, data recording is continued on the hard disk.

  In step 2003, when the user presses the shooting stop button, the recording size is checked using the comparison unit 420. Here, the object of comparison is the data size currently recorded in the hard disk and the division size information determined in advance before recording. The partition size information normally specifies the capacity of the backup destination media. That is, 4.7 GB for a 12 cm DVD and 1.4 GB for an 8 cm DVD medium. If the comparison unit 420 determines that the current recording size is within the division size, the recording file is closed as it is, the management information is updated, and the recording is stopped. If the comparison unit 420 determines that the recording size has already exceeded the division size information, the process advances to step 2004.

  In step 2004, it is determined whether or not the scene recorded this time is the first scene. If it is the first scene, the process proceeds to step 2008. Otherwise, the process proceeds to step 2005.

  In step 2005, the detection unit 440 detects the end position of the previously recorded scene. Here, the detection unit 440 refers to the management information, that is, the IFO file, and detects the end position of the previous scene. This is because, since the recording size exceeds the size of the first folder, that is, the media size of the backup destination, the end position of the previous scene is searched and the subsequent data is stored in a new folder.

  In step 2006, the stream data recorded on the hard disk, that is, the VRO file 3015 is divided at the position detected in step 2005 using the dividing unit 410 and the stream control unit 430 which are constituent elements in the memory 400.

  In step 2007, the management information 3014 and 3013 are updated using the management information editing unit 450, which is a component in the memory 400, in accordance with the first half of the streams divided into two in step 2006 or step 2008. . At this time, since the management information before the division includes the management information of the stream data after the division, it is necessary not to delete it in the update work performed on the first half of the stream after the division. Alternatively, the backup file 3013 of the IFO file is not updated at the same time as the IFO file 3014, but is not updated until the management information 3024 for the latter half of the stream after division is completed, and the IFO file 3024 of the latter half of the stream is updated. The backup file 3013 of the IFO file may be updated after completion.

  In step 2008, the stream data recorded on the hard disk, that is, the VRO file is divided using the dividing unit 410 and the stream control unit 430 which are constituent elements in the memory 400. Here, the division point automatically selects a position where the size obtained by subtracting the size of the latter half of the stream divided into two from the total size of the data recorded on the hard disk is below the division size information.

  In step 2009, a new IFO file for recording the management information of the latter half of the stream divided into two in step 2006 or step 2008 is created. Here, the management information is created at the position 3024 in FIG. 4 by the management information creation unit 460, which is a component of the memory 400, and at present, the IFO file is empty.

  In step 2010, management information of the latter half of the stream after the stream division is written in the IFO file 3024 created in step 2009. The information to be written here is updated by the management information editing unit 450, which is a component in the memory 400, so that it is satisfied that the divided stream is correctly reproduced.

  In step 2011, the IFO file 3024 updated in step 2010 is closed.

  In step 2012, the stream file handled in steps 2001 to 2010 is closed.

  By recording the video in the above steps, the recorded data can be automatically divided so as to fit within the capacity of the backup destination recording medium without dividing one scene in the middle, so that it is possible to save the trouble of the photographer's backup operation. At the same time, it is possible to back up according to the photographer's image.

The video recording method and the video recording apparatus according to the present invention automatically divide and save the trouble of the photographer's backup operation. It has a function that can be backed up according to the user's image because it can be divided, converts the video signal into digital data, and compresses it in a large capacity recording medium such as HDD (HARD DISK DRIVE) in MPEG (Motion Picture Expert Group) When recording, it is useful when recording while dividing into a format that can be easily stored in a small-capacity medium (for example, a DVD (Digital Versatile Disk)) at the backup destination.

1 is a configuration diagram of a video camera in Embodiment 1 of the present invention. Connection diagram of video camera and personal computer in Embodiment 1 of the present invention Flowchart of stream division in Embodiment 1 of the present invention Directory configuration diagram in the HDD according to the first embodiment of the present invention

Explanation of symbols

100 video camera 200 central processing unit (CPU)
300 bus 400 memory 410 division unit 420 comparison unit 430 stream control unit 440 detection unit 450 management information editing unit 460 management information creation unit 500 HDD
600 Camera 700 Display unit 800 USB
900 USB cable 1000 PC 1010 DVD drive

Claims (15)

In a video recording apparatus that records and reproduces video data on a randomly accessible recording medium,
A comparison unit for comparing the division size information for data division and the current recording capacity;
A detection unit for detecting a position where recording was previously stopped in the recording medium;
A stream division unit that divides the stream data at the position detected by the detection unit;
A management information editing unit that edits management information according to the position detected by the detection unit;
A stream control unit that generates stream data exceeding the division size information as a new stream;
A management information generating unit that generates new management information for the stream data generated by the stream control unit;
In the comparison unit, when the comparison result between the division size and the current recording capacity indicates that the recording capacity exceeds the division size information, the stream division unit outputs a stream at the recording stop position detected by the detection unit. The management information editing unit edits the management information according to the position detected by the detection unit, and the stream control unit generates stream data exceeding the division size information as a new stream. Further, the management information generation unit generates new management information for the stream data generated by the stream control unit. The division size information is a capacity of a backup destination external medium when the recorded video data is backed up to an external medium, and is stored in the apparatus in advance or can be changed. The video recording apparatus according to claim 1. The detection unit detects a scene that has been recorded last time based on scene start information, scene recording time, and scene recording end time included in the management information, and at the same time, detects a scene that has been recorded last time on the stream data. The video recording apparatus according to claim 1, wherein the video recording apparatus is detected. 2. The management information editing unit according to claim 1, wherein when the stream dividing unit divides the stream data, the management information editing unit changes the management information so that stream data with old time information can be reproduced. Video recording device. The management information creation unit creates management information for managing stream data with a newer time created when the stream data is divided by the dividing unit and manages the stream data before dividing. 2. The video recording apparatus according to claim 1, wherein the management information of the stream is reflected in the created management information, and a change is made so that the stream data with the newer divided time can be reproduced. When the size of one scene exceeds the division size information, the division unit can select to allow division within the size of the division size information, and automatic division is effective. 2. The video recording apparatus according to claim 1, wherein the video recording apparatus automatically divides even in the middle of one scene. The video recording apparatus according to claim 1, wherein the stream data is MPEG data. 2. The video recording apparatus according to claim 1, wherein the backup destination recording medium is a removable recording medium. The video recording apparatus according to claim 1, wherein the stream data and the management information conform to a DVD-VR standard. When the recording of the video data is finished by the user's operation, if the recording exceeds the division size information, the comparison step for comparing the current recording capacity, and the division size information, the previous recording is finished. A detecting step for detecting a position; a stream dividing step for dividing stream data at the position detected by the detecting step; and a management information editing step for performing editing to indicate that the management information of the stream data is also divided. A stream control step for recording a new data stream from the position detected by the detection step to a portion recorded in excess of the division size information, and newly managing information for the newly divided data stream. A video recording method comprising a management information creation step of creating. In the detection step, based on scene start information, scene recording time, and scene recording end time included in the management information of the stream data, a scene that has been recorded last time is detected from the management information and at the same time on the stream data. The video recording method according to claim 10, further comprising: detecting a scene that has been recorded last time. In the management information editing step, when the stream data already existing in the recording medium is divided by the scene detected in the detection step, the old time stream data that can be divided is reproduced. The video recording method according to claim 10, wherein the video recording method is modified and saved as possible. The management information creating step creates management information for managing stream data having a newer time created when the stream data is divided by the dividing step, and manages the stream data before dividing. 11. The video recording method according to claim 10, wherein the management information of the stream is reflected in the created management information and a change is made so that the stream data with the newer time after division can be reproduced. In the division step, when the size of one scene exceeds the division size information, it can be selected that the division can be performed within the size of the division size information, and automatic division is effective. 11. The video recording method according to claim 10, wherein in such a case, the image is automatically divided even in the middle of one scene. The video recording method according to claim 10, wherein the stream data and the management information conform to a DVD-VR standard.

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