JP3823426B2 - Information signal processing apparatus and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an information signal processing apparatus that processes video information included in an information signal.
[0002]
[Prior art]
Conventionally, a digital video disc (DVD) has been provided as a medium for recording software such as video and audio. This DVD is an optical disk having a diameter of 12 cm, and is recorded along a track of one or two recording layers provided on one or both sides as an information signal obtained by digitizing information such as video and audio.
[0003]
The information signal is recorded on the DVD recording layer as a packet according to a predetermined format. Information such as video and audio is packetized, so that it can be mixed in a series of streams of information signals, and information channels are multiplexed. A packet in which various channels are mixed by multiplexing information is separated according to the channel at the time of reproduction.
[0004]
In order to reproduce video information from such a DVD, the video information is separated from a series of streams of information signals read from the DVD, and the video information can be decoded and displayed as a video on a television receiver. Certain signal processing is performed by the information signal processing apparatus.
[0005]
[Problems to be solved by the invention]
By the way, the information signal processing apparatus includes a buffer for holding video information in order to continuously supply video signals. That is, since video information is intermittently extracted in packets from a series of information signal streams, it is necessary to store at least a certain amount of video information in a buffer in order to decode the video signal at a constant rate. There is.
[0006]
For this reason, since the image decoded into the video signal and displayed on the television receiver is temporarily stored in the buffer, the video extracted from the series of information signal streams supplied to the information signal processing device. There will be a time delay between the information.
[0007]
For this reason, a problem may occur when performing special reproduction. For example, when a video jump is performed, the video remaining in the buffer memory before the jump may be displayed. Further, since the video information extracted from the information signal is described based on a predetermined format, there are cases where a portion that can be normally reproduced after a jump is limited.
[0008]
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an information signal processing apparatus and method that do not cause a problem even when special reproduction is performed.
[0009]
[Means for Solving the Problems]
A signal recording apparatus according to the present invention controls an extraction means for extracting video information from an information signal including at least video information, a data insertion means for inserting invalid data into the extracted video information, and the data insertion means And a control means for controlling the insertion of data into the video information, a linear buffer part for holding the video information from the data insertion means in the order of input, and a ring buffer part for receiving an output from the linear buffer part. A buffer and decoding means for decoding video information from the buffer, and the control means controls the data insertion means when supply of the information signal is stopped by special reproduction so that invalid data is inserted into the video information. To sequentially output video information held in the linear buffer portion of the buffer, and the control means When playing the image information without a header, and controls the data inserting means, in which is inserted a predetermined header to the video information.
[0013]
The information signal processing apparatus includes a reading unit that reads the information signal from the medium.
[0014]
Further, the information signal processing apparatus includes an analysis unit that analyzes a type of a time-series information signal packet, and a switching unit that switches a destination of the packet according to a result of the analysis.
[0015]
In order to solve the above-described problems, a signal recording method according to the present invention includes a step of extracting video information from an information signal including at least video information, and a data insertion step of inserting invalid data into the extracted video information. A control step for controlling the insertion of data into the video information, a step of holding the video information from the data insertion step in the linear buffer portion of the buffer including the linear buffer portion and the ring buffer portion in the order of input, and A decoding step for decoding video information from the buffer. In the control step, the data insertion is controlled when supply of the information signal is stopped by special reproduction, and invalid data is inserted into the video information, thereby causing the buffer to The video information held in the linear buffer part is output in order, and the control process does not have a header. When playing the information, it controls the data insertion, in which is inserted a predetermined header to the video information.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of an information signal processing apparatus and method according to the present invention will be described in detail with reference to the drawings.
[0020]
As shown in FIG. 1, an example of an embodiment of an information signal processing apparatus according to the present invention is provided with a pickup 2 for reproducing an RF signal from an optical disc 1 and an RF signal reproduced by the pickup 2 to which the RF signal is supplied. An RF circuit 3 that performs binarization processing, a data decoder 4 that is supplied with reproduction data from the RF circuit 3 and performs decoding processing such as error correction, and reproduction data that has been decoded by the data decoder 4 And a demultiplexer 5 that distributes the compressed data, the sub-picture compressed data, and the audio compressed data.
[0021]
The information signal processing apparatus also includes a video decoder 6 that decompresses the main video compressed data, a sub video decoder 7 that decompresses the sub video compressed data and combines it with the main video data, and decompresses the audio compressed data. Digital / NTSC, PAL conversion circuit (hereinafter simply referred to as NTSC conversion circuit) which is supplied with video data obtained by synthesizing main video data and sub-video data from the audio decoder 8 and the sub-video decoder 7 and converts them into NTSC signals or PAL signals. .) 9 and a digital / analog conversion circuit (hereinafter simply referred to as a D / A conversion circuit) 10 which is supplied with audio data from the audio decoder 8 and converts it into an analog signal.
[0022]
The information signal processing apparatus controls the pickup 2, RF circuit 3, data decoder 4, demultiplexer 5, video decoder 6, sub-picture decoder 7, audio decoder 8, NTSC conversion circuit 9 and D / A conversion circuit 10. A controller 11, a user interface 12 that mediates the controller 11 and a user's operation input, and a memory 13 that serves as a data storage unit of the controller 11.
[0023]
This information signal processing apparatus reproduces a read-only, write-once, and rewritable DVD disc and a DVD-VIDEO disc as the optical disc 1.
[0024]
The pickup 2 reproduces an RF signal from the optical disc 1 and supplies it to the RF circuit 3.
[0025]
The RF circuit 3 equalizes and binarizes the waveform of the RF signal to generate digital data and its synchronization signal. Digital data or the like generated by the RF circuit 3 is supplied to the data decoder 4.
[0026]
The data decoder 4 performs processing such as data demodulation and error correction based on the digital data generated by the RF circuit 3. The digital data demodulated by the data decoder 4 is supplied to the demultiplexer 5.
[0027]
The data decoder 4 detects system information in the MPEG2 format, parameter information included in a pack header or the like, predetermined information included in a navigation pack (Navigation Pack: NV_PCK) in the DVD format, and the like. The detected parameter information and the like are supplied from the data decoder 4 to the controller 11.
[0028]
The data decoder 4 has a track buffer 4a at the digital data output stage. The track buffer 4a absorbs the difference in processing speed between the data decoder 4 and the demultiplexer 5.
[0029]
The demultiplexer 5 divides the digital data subjected to the error correction decoding process or the like by the data decoder 4 into main video compressed data, sub video compressed data, and audio compressed data.
[0030]
Here, the main video compressed data is video data compressed by the MPEG2 method, and is, for example, Video streams in the DVD format. The sub-picture compressed data is data such as a caption image synthesized with the main picture, and is, for example, Sub-picture streams in the DVD format. The audio compressed data is audio data compressed by a method such as MPEG2, and is an audio stream in the DVD format.
[0031]
The demultiplexer 5 supplies the main video compressed data to the video decoder 6, supplies the sub video compressed data to the sub video decoder 7, and supplies the audio compressed data to the audio decoder 8.
[0032]
The video decoder 6 performs decoding processing of the main video compressed data, and generates main video data expanded by the decoding processing. The video decoder 6 has a memory for three screens in order to perform a decoding process. That is, I-Picture, P-Picture, and B-Picture in the MPEG2 format are decoded and stored in the memory of the video decoder 6, and each decoded picture is output from this memory. Note that this memory is not limited to three screens and may have more capacity. The video decoder 6 supplies the generated main video data to the sub video decoder 7.
[0033]
The sub-picture decoder 7 performs a decoding process on the sub-picture compressed data, and synthesizes the decoded sub-picture data with the main picture data supplied from the video decoder 6 to generate video data. That is, the sub video decoder 7 synthesizes a subtitle image or the like reproduced as sub video data with the main video. The sub video decoder 7 outputs the main video data as it is as video data when there is no sub video data. The sub video decoder 7 supplies the generated video data to the NTSC conversion circuit 9.
[0034]
The audio decoder 8 decodes the audio compression data to generate decompressed audio data. That is, if the audio compressed data is compressed in the MPEG2 format, the audio decoder 8 performs an expansion process corresponding to this and generates audio data. If the audio data is encoded in a format such as PCM in addition to the MPEG2 format, a decoding process corresponding to this is performed. The audio decoder 8 supplies the generated audio data to the D / A conversion circuit 10.
[0035]
The NTSC conversion circuit 9 converts the video data from digital data into a television signal such as NTSC or PAL and outputs it. By supplying this output to a monitor or the like, the user can view the video reproduced from the recording medium 1.
[0036]
The D / A conversion circuit 10 converts audio data that is digital data into analog audio data and outputs the analog audio data. By supplying this output to a speaker or the like, it is possible to view the video reproduced from the recording medium 1 by the user.
[0037]
The controller 11 controls the pickup 2, RF circuit 3, data decoder 4, demultiplexer 5, video decoder 6, sub-picture decoder 7, audio decoder 8, NTSC conversion circuit 9 and D / A conversion circuit 10.
[0038]
The controller 11 receives an operation input via an operation panel or a user interface 12 which is a remote controller, and controls each circuit based on the operation input.
[0039]
The controller 11 stores each control data in the memory 13 and controls each circuit based on the data stored in the memory 13.
[0040]
FIG. 2 is a block diagram showing a configuration of a main part of a DVD reproducing apparatus in which the code buffer is clearly shown. The main video compressed data from the demultiplexer 5 is temporarily stored in the code buffer 6a. The read data is sent to the video decoder 6. The sub-picture compressed data from the demultiplexer 5 is temporarily stored in the code buffer 7a, the audio compressed data is temporarily stored in the code buffer 8a, and the data read from the code buffers 7a and 8a is sub-picture ( SP) sent to the decoder 7 and the audio decoder 8. In many cases, these code buffers 6a, 7a, 8a are actually provided at the input stages of the decoders 6, 7, 8 respectively. Further, the switching controller 15 is for switching the STC (system time clock) appropriately and supplying it to each of the decoders 6, 7, 8 at the time of scene branching or the like. The other configuration is the same as the configuration of FIG.
[0041]
In the DVD-VIDEO disc, as shown in FIG. 3, main video data, sub-video data, and audio data are managed in units of Video Object Set (VOBS). This VOBS is a unit of, for example, one movie work. This VOBS is composed of a plurality of Video Objects (VOB). This VOB is a unit in which each data is recorded as a group on the disc. Moreover, this VOBS is comprised by several Cell. This cell is a unit of one scene or one cut in a movie, for example, and one cell is a unit of time from several minutes to several tens of minutes. In addition, the DVD has a function of skipping scenes that are undesirable in education, such as a multi-story format in which one movie can be viewed in multiple story developments, and a violent scene called so-called parental lock. Such a function is created by the combination of the cells.
[0042]
The cell is composed of a plurality of video object units (VOBU). This VOBU is a unit of 0.4 to 1.2 seconds in a moving image, and a plurality of GOPs (Group Of Pictures) in the MPEG2 format are included in this VOBU.
[0043]
This VOBU includes a navigation pack NV_PCK which is a pack having management information of this VOBU, a video pack V_PCK which is a pack having main video, an audio pack A_PCK which is a pack having audio data, and a pack having sub-video data. It is composed of a certain sub-picture pack SP_PCK. The video pack V_PCK, audio pack A_PCK, and sub-picture SP_PCK are each compressed on a recording medium 1 after being compressed in a format such as MPEG2.
[0044]
In the DVD-VIDEO disc format, each piece of data having the structure described above is managed by various management information. When the video data or the like is reproduced from the optical disc 1, the controller 11 acquires the management information from the optical disc 1 and stores it in the memory 13, and performs control such as data reproduction.
[0045]
Here, as an example of the information signal input to the demultiplexer 5 of the information signal processing device, FIG. 4 shows a pack including the video packet V_PKT (that is, the video pack V_PCK).
[0046]
This pack includes a pack header PH and a video packet V_PKT. The video packet V_PKT further includes a packet header PKT_H and a video packet payload PKT_PL. Here, the pack header PH and the packet header PKT_H include management information and the like, and the video packet payload PKT_PL includes video information.
[0047]
An example of the demultiplexer 5 to which these information signals are input includes an analysis unit 51, a data generation unit 52, a selector 53, and a changeover switch 55, as shown in FIG. The information signal input to the demultiplexer 5 is analyzed by the analysis unit 51 for the type of pack. That is, it is analyzed whether the pack is the navigation pack NV_PCK, the video pack V_PCK, the audio pack A_PCK, or the sub-picture pack SP_PCK. The data generation unit 52 and the changeover switch 55 constitute a data insertion unit that inserts data into the video information from the analysis unit 51, as will be described later.
[0048]
The packet of the information signal analyzed by the analysis unit 51 is subjected to a video switching terminal V, a sub-picture switching terminal SP, and an audio switching terminal by the selector 53 under the control of the analysis unit 51 according to the analysis result. A, switching to the navigation switching terminal NV.
[0049]
Between the analysis unit 51 and the selector 53, a data insertion unit including a data generation unit 52 for generating invalid data, so-called dummy data, and a changeover switch 55 is provided. This data insertion unit inserts dummy data (invalid data) into the video information from the analysis unit 51 in accordance with the control signal. That is, when the information signal supplied to the information signal processing apparatus is stopped, the dummy data (invalid data) generated by the data generating unit 52 is controlled by the controller 1 through the selector switch 55 under the control of the controller 1. Send to. The selector 53 is switched to the video switching terminal V and sends this dummy data to the video buffer 6a provided in the video decoder 6 of FIG.
[0050]
As shown in FIG. 6, the video buffer 6a includes a linear buffer LB and a ring buffer RB.
[0051]
The linear buffer LB is a kind of shift register that holds a predetermined amount of data in a linear memory in order, and outputs the data in the input order by sequentially moving the data from the input side to the output side. Data output from the linear buffer LB is sequentially input to the ring buffer RB.
[0052]
Here, since the linear buffer LB always holds a certain amount of data, when the supply of the image information signal to the video buffer 6a is stopped at the time of stoppage of reproduction or track jump, the linear buffer LB Although the data held in the linear buffer LB remains and cannot be decoded, in the present embodiment, as will be described later, dummy data from the dummy data generation unit 52 is sequentially input. Thus, the data is pushed out in order.
[0053]
The ring buffer RB sequentially writes data to a write point WP in a memory arranged in a ring shape, and sequentially reads data from a read point RP. In the ring buffer RB, the rate of data to be output can be freely changed as long as the read point RP does not pass the write point WP. The ring buffer RB can output all the data held by the ring buffer RB by moving the read point RP.
[0054]
The video buffer 6a is a so-called FIFO (First In First Out) type buffer in which the first input data is output first.
[0055]
By the way, since such a video buffer 6a has a linear buffer LB in part, the video buffer 6a always holds a certain amount of data. For this reason, when the information signal input to the information signal processing apparatus is stopped, the image information before the stop remains in the video buffer 6a.
[0056]
For example, if the supply of information signals to the video buffer 6a is stopped during special playback such as video jump, video information that has not been decoded still remains in the video buffer 6a. Some of the output data will not be output as video. Further, when the supply of the information signal from the DVD-VIDEO is resumed, the remaining video information is output ahead of the read information signal.
[0057]
Therefore, in order to output video normally at the time of special reproduction accompanied by the stop of the supply of the information signal, the video information held in the linear buffer LB of the video buffer 6a is output once when the information signal is stopped. It is necessary to make it.
[0058]
For this purpose, the data insertion section in the demultiplexer 5 is controlled by a control signal from the controller, and dummy data is inserted into the video information and sent to the video buffer 6a, thereby remaining in the linear buffer LB. The data is pushed out in order. That is, when the supply of the information signal to the demultiplexer 5 in FIG. 1 is stopped, the controller 11 sends a control signal to the data insertion unit in FIG. 5 to control the data generation unit 52 and the changeover switch 55, and the data generation unit The dummy data generated at 52 is sent to the selector 53 via the changeover switch 55. The selector 53 is switched to the video switching terminal V, and the dummy data is sent to the video buffer 6a of the video decoder 6, and the video information remaining in the linear buffer LB is pushed out. Displayed.
[0059]
As the dummy data (invalid data), data that is skipped at the time of decoding (for example, “FF”) is used, and the dummy data itself has no influence on the display of the image. It is.
[0060]
Next, another example of the demultiplexer 5 will be described with reference to FIG.
The demultiplexer 5 includes an analysis unit 51, a data generation unit 52, a selector 53, and a changeover switch 55 as in the above example. However, in this demultiplexer 5, a data insertion section comprising a data generation section 52 and a changeover switch 55 is connected to the output side of the video switching terminal V of the selector 53.
[0061]
The information signal input to the demultiplexer 5 is analyzed for each packet by the analysis unit 51 in the same manner as described above, and the packet is controlled by the selector 53 under the control of the analysis unit 51 by the selector 53 and the sub picture switching terminal. It is switched to SP, audio switching terminal A, and navigation switching terminal NV.
[0062]
The data insertion unit is controlled by a control signal from the controller 1 when the information signal supplied to the information signal processing device is stopped, and the video information output from the video switching terminal V of the selector 53 is controlled. Instead, the dummy data generated by the data generator 52 is output from the demultiplexer 5 via the changeover switch 55.
[0063]
7, the dummy data can be sent to the video buffer 6a when the supply of the information signal is stopped, and the video information remaining in the linear buffer LB can be pushed out as in the configuration of FIG. It is.
[0064]
Here, an example of a mode in which dummy data is inserted into video information will be described with reference to FIG. From the video switching terminal V, video information is output in units of video packet payload PTK_PL including substantial video information in the video packet V_PKT input to the demultiplexer 5. The insertion data INS such as the dummy data is inserted between the video packet payloads PKT_PL.
[0065]
Next, details of information signal exchange between the demultiplexer 5 and the video decoder 6 will be described.
[0066]
As shown in FIG. 9, the demultiplexer 5 here includes an analysis unit 51, a data insertion unit 56, a selector 53, and an interface 54. The video decoder 6 includes a video buffer 6a.
[0067]
The information signal input to the demultiplexer 5 is analyzed for the type of packet by the analysis unit 51, the packet is switched by the selector 53 based on the control of the analysis unit 51, and the video information is in units of video packet payload. It is output to the video decoder 6. The video information is input to the video buffer 6 a provided in the video decoder 6.
[0068]
The data insertion unit 56 is controlled by the control signal supplied from the controller 1 to the demultiplexer 5 and inserts predetermined data into the video information via the selector 53. That is, the data insertion unit 56 performs dummy data insertion, system header insertion, and the like. The insertion of this system header will be described later.
[0069]
The interface 54 provides the video decoder 6 with a data clock signal CDCK and a video strobe signal VSTB that is at a low level while video data is being sent, and receives a video full signal VFFULL. And these conditions are alert | reported to the analysis part 51. FIG.
[0070]
Next, a temporal change in the amount of data stored in the video buffer 6a will be described.
[0071]
As shown in FIG. 10, the amount of data decreases at a time at time t1, time t2, and time t3. This is because the data to be decoded is extracted at these times t1, t2, and t3. The slope of the broken line in the figure indicates the rate at which data is input to the video buffer 6a.
[0072]
Next, various signals shown in FIG. 8 will be described.
[0073]
As shown in FIG. 11A, the data clock signal CDCK is a square wave having a constant period, and gives a timing for transferring data.
[0074]
As shown in FIG. 11B, the data signal CD is sent in synchronism with the unit of data in one cycle of the data clock CDCK based on the timing given by the data clock signal CDCK.
[0075]
As shown in FIG. 11C, the video strobe signal VSTB is at a low level when the data signal CD is valid, but is at a high level when the data signal CD is invalid.
[0076]
The video full signal VFFULL is a signal to be notified when the data accumulated in the video buffer 6a reaches the upper limit value of the capacity of the video buffer, as shown at (d) in FIG.
[0077]
When the video full signal VFFULL becomes high level, the video strobe signal VSTB becomes high level, and supply of valid data from the demultiplexer 5 to the video decoder 6 is stopped.
[0078]
Next, another example of data insertion for image information by the data insertion unit 52 included in the demultiplexer 5 shown in FIG. 9 will be described.
[0079]
In the information signal processing apparatus, special reproduction such as jumping of the position of the video may be performed when the video signal based on the so-called MPEG format is reproduced.
[0080]
Here, MPEG is discussed in ISO-IEC / JTC1 / SC2 / WG11 and is proposed as a standard proposal, and is a hybrid method data combining motion compensation prediction coding and discrete cosine transform coding. It is a compression standard.
[0081]
Such MPEG image information includes intra-frame predictive encoded images (intra-encoded images, I pictures), inter-frame forward predictive encoded images (P pictures), and inter-frame bi-directional predictive encoded images (B pictures). ).
[0082]
As an example of MPEG image information, there are frames in which a frame having an I picture, 4 P pictures, and 10 B pictures is composed of 15 frames.
[0083]
Meanwhile, the video information by such MPEG, as shown in (a) in FIG. 12, the middle portions of the I-picture I _N series of video information, there is a case where the system header SH is not added.
[0084]
In such a case, since necessary information in the I picture I _N cannot be obtained from the system header SH, there is a case where reproduction after jumping the video to the I picture I _N is not normally performed. is there.
[0085]
When the data insertion unit (the data generation unit 52 and the changeover switch 55) shown in FIGS. 5 and 7 outputs a picture signal to the video decoder 6 under the control of the controller 1, (b) in FIG. As shown in FIG. 4, a system header can be added to the I picture of the video signal. This can be realized by using a circuit that generates the system header SH as the data generation unit 52 of FIGS.
[0086]
Since such a video signal has a system header SH at a predetermined location, the video can be displayed without any trouble even in the case of special reproduction such as jump.
[0087]
【The invention's effect】
As described above, according to the information signal device and method of the present invention, the demultiplexer causes the video information stored in the video buffer to be discharged by inserting predetermined data into the video signal in a predetermined case. It is possible to prevent the video remaining in the buffer from being displayed during special playback such as stop or jump.
[0088]
Further, by inserting certain information such as a system header into the video information, it is possible to broaden the selection of locations where video signal playback is started.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of an information signal processing apparatus according to the present invention.
FIG. 2 is a block diagram showing a configuration of a main part of the information signal processing apparatus.
FIG. 3 is a data structure diagram showing a data structure in a DVD-VIDEO disc.
FIG. 4 is a data structure diagram showing an example of a data structure of an information signal input to a demultiplexer included in the information signal processing apparatus.
FIG. 5 is a block diagram showing an example of the configuration of the demultiplexer.
FIG. 6 is a schematic diagram schematically showing a configuration of a video buffer included in the video decoder.
FIG. 7 is a block diagram showing another example of the configuration of the demultiplexer.
FIG. 8 is a data structure diagram illustrating a data structure of video information into which data is inserted by a data insertion unit included in the demultiplexer.
FIG. 9 is a block diagram showing data exchange between a video decoder provided in the information signal processing apparatus and the demultiplexer.
FIG. 10 is a graph showing a change over time in the amount of data stored in the video buffer.
FIG. 11 is a time chart of various signals between the demultiplexer and the video decoder.
FIG. 12 is a data structure diagram illustrating an example of image information on which special reproduction is performed.
[Explanation of symbols]
1 optical disk, 4 data decoder, 5 demultiplexer, 6 video decoder, 6a video buffer

Claims (4)

Extraction means for extracting video information from an information signal including at least video information;
Data insertion means for inserting invalid data into the extracted video information;
Control means for controlling the data insertion means and controlling insertion of data into the video information ;
A buffer including a linear buffer portion that holds video information from the data insertion means in the order of input and a ring buffer portion to which an output from the linear buffer portion is input;
Decoding means for decoding video information from this buffer,
The control means controls the data insertion means when the supply of the information signal is stopped by special reproduction, and sequentially outputs the video information held in the linear buffer portion of the buffer by inserting invalid data into the video information. The control means controls the data inserting means to insert a predetermined header into the video information when reproducing from image information having no header. Signal processing device.   2. The information signal processing apparatus according to claim 1, further comprising reading means for reading the information signal from a medium.   2. The information signal processing apparatus according to claim 1, further comprising: an analyzing unit that analyzes a type of a time-series information signal packet; and a switching unit that switches a destination of the packet based on a result of the analysis. Extracting video information from an information signal including at least video information;
A data insertion step of inserting invalid data into the extracted video information;
A control step for controlling insertion of data into the video information ;
Holding the video information from the data insertion step in the linear buffer portion of the buffer including the linear buffer portion and the ring buffer portion in the order of input;
Decoding the video information from the buffer,
In the control step, the data insertion is controlled when the supply of the information signal by special reproduction is stopped, and the video information held in the linear buffer portion of the buffer is sequentially output by inserting invalid data into the video information. In addition, in the control step, when reproducing from image information having no header, the data insertion is controlled to insert a predetermined header into the video information. Method.

Images