JPH11103445A - Video recording device and video editing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change-over the display/nondisplay of a date at the time of video display based on a picked-up image picked-up by a camera. SOLUTION: A video signal from the camera 6 is given to an MPEG encoder 7 so as to generate an MPEG 3 video stream. A bit map generating circuit 9 generates bit map data based on date information from date generating circuit 8 and the bit map data is converted into a sub-video stream by a sub-video encoder 10. The video stream and the sub-video stream are multiplexed by a systematizing circuit 3 so as to be recorded. Date information is recorded as the sub-video stream so that the display/nondisplay of date information are exchanged at the time of reproduction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video recording device and a video editing device for multiplexing and recording a video stream and a sub-video stream.

[0002]

2. Description of the Related Art In a conventional video recording apparatus such as a video camera, not only a captured image can be stored, but also additional information relating to shooting such as a shooting date and time can be recorded. In order to record information such as date and time on a video tape or the like as a video, it is necessary to convert the information such as date and time into a video signal and then combine it with a captured image.

FIG. 6 is a block diagram showing such a conventional video recording apparatus.

[0004] The video camera 6 supplies a video signal based on the captured image obtained to the video synthesis circuit 19. On the other hand, the clock circuit 17 stores the current date and time data
Output to The date and time video creating circuit 18 creates display data indicating the date and time based on the input date and time data, converts the display data into a video signal, and outputs the video signal to the video synthesizing circuit 19.

[0005] The video signal from the camera 6 and the video signal from the date / time video creation circuit 18 are combined in a video composition circuit 19. The video synthesizing circuit 19 creates, for example, a video signal of an image in which the display of the date and time is displayed in white or blue at the lower end of the captured image. The video signal from the video synthesizing circuit 19 is supplied to the recording device 4 and recorded on the VCR tape 20.

As described above, the date and time are superimposed and displayed on the captured image.
Therefore, a part of the captured image is lost due to the display of the date and time, and the captured image is difficult to see in the display part of the date and time. Naturally, it is not possible to delete the display of the date and time of the superimposition once.

[0007]

As described above, in the above-described conventional video recording apparatus, the display of the captured image may be difficult to see due to the additional information. There is a problem that it cannot be erased.

The present invention has been made in view of the above problems, and has as its object to provide a video recording apparatus and a video editing apparatus capable of freely displaying and hiding additional information such as date and time. I do.

[0009]

According to a first aspect of the present invention, there is provided a video recording apparatus which obtains a video signal based on a captured image by capturing an image, and MPEG-encodes the video signal to create a video stream. Apparatus, sub-video stream generating means for generating a sub-video stream based on additional information data including at least the information obtained at the time of imaging, and multiplexing means for multiplexing the video stream and the sub-video stream to generate a system stream And a recording device for recording the system stream created by the multiplexing means on a recording medium. The video editing device according to claim 5, wherein the video editing device Demultiplexing means for receiving a signal multiplexed with information data and separating the video signal and additional information data A video stream creating means for creating a video stream from the video signal output by the separating means; a sub-video stream creating means for creating a sub-video stream based on the additional information data output by the separating means; Multiplexing means for outputting a system stream created by multiplexing a stream and a sub-picture stream.

In the first aspect of the present invention, a video signal based on a captured image captured by a video camera device is an MPEG signal.
Encoded to create a video stream. A sub-picture stream is created using at least information obtained at the time of imaging as additional information data. The video stream and the sub-picture stream are multiplexed by multiplexing means. The system stream includes a video stream and a sub-picture stream created independently of each other, and this system stream is recorded on a recording medium.

According to a fifth aspect of the present invention, a signal in which a video signal and additional information data are multiplexed is separated by a separating means. The video signal is applied to a video stream creating means to create a video stream, and the additional information data is applied to a sub-video stream creating means to create a sub-video stream. The multiplexing unit multiplexes the video stream and the sub-picture stream and outputs a system stream.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a video recording apparatus according to the present invention.

In this embodiment, a stream based on the additional information is created, a stream based on the captured image and a stream based on the additional information are combined, and the combined stream is recorded.

As shown in FIG. 1, a video recording device 21 includes a video stream creating unit 1 and a sub-image stream creating unit 2.
have. The camera 6 of the video stream creation unit 1 captures an object (not shown) and outputs a video signal based on the captured image to the MPEG encoder 7.
The MPEG encoder 7 converts the input video signal into an MPEG signal.
(Movin Picture Experts Group) The video stream is converted into a video stream of the 2 standard and output to the systematic circuit 3.

On the other hand, the date and time generation circuit 8 of the sub-picture stream generation unit 2 generates date and time information, which is additional information, based on the output of a clock device (not shown) and outputs it to the bit map generation circuit 9. The information of the date and time generation circuit 8 is
Each time the output of the clock device is updated, it is updated.

FIG. 2 is an explanatory diagram for explaining the output of the date and time generating circuit 8 in FIG.

As shown in FIG. 2, the date and time generating circuit 8
Outputs information in which year, month, day, hour, minute, and second are each represented by one byte. The upper 4 bits of each byte indicate 10 digits of each information, and the lower 4 bits indicate 1 digit. In the example of FIG. 2, 18:36:59 on June 18, 1996 is shown.

The bitmap generation circuit 9 generates bitmap data for displaying date and time based on the input date information and time information. For example, the bitmap generation circuit 9 holds twelve bitmap data of numbers “0 to 9” and “:” and “/” as pattern data. Based on this, bitmap data of a date in a display format of △△ / △△ / △△ and bitmap data of a time in a display format of ○: ○ :： are created.

The bitmap generation circuit 9 outputs to the sub-picture encoder 10 bitmap data of only date, bitmap data of only time, and bitmap data indicating date and time.

The sub-picture encoder 10 encodes the input bitmap data and creates a sub-picture stream. As the sub-picture stream, for example, there is a stream specified in the DVD video standard.

The DVD video standard is described in the literature (DV
D Specifications for Read-OnlyDisc Part3 VIDEO S
PECIFICATIONS Version 1z0 August 1996). In the DVD video standard, there are sub-pictures. The sub-video is used for displaying subtitles of a movie or lyrics of karaoke. According to the DVD video standard, data for displaying these is encoded separately from the video and recorded on a disc.

In the DVD video standard, a maximum of 32 sub-pictures can be set for one picture.
Caption data in multiple languages can be recorded. In this case, the user can select and display subtitle data in a desired language from a plurality of recorded subtitle data.

The sub-picture encoder 10 creates a sub-picture stream based on bitmap data only with date, a sub-picture stream based on bitmap data only with time, and a sub-picture stream based on bitmap data indicating date and time. , And to the systemized circuit 3. The sub-picture stream created by the sub-picture encoder 10 is configured such that pixel data constituting one screen of the sub-picture and sub-picture unit data including display period information are arranged for each sub-picture.

The date and time generating circuit 8 transmits date data only when the date is changed.
Therefore, if the sub-video stream is created based only on the data from the date and time generation circuit 8, the date will not be displayed if the intermediate playback occurs. Therefore, the sub-picture encoder 10 creates a stream in which sub-picture unit data for the same date data is additionally arranged, for example, every three seconds. Thus, even when the reproduction is performed from the middle of the stream, the display non-display period of the date data as the sub-video can be set to a relatively short time of 3 seconds or less.

The systemization circuit 3 is provided with an MPEG2 video stream and three types of sub-picture streams from the MPEG encoder 7, and packetizes and multiplexes these in predetermined units to generate a system stream. The systemization circuit 3 supplies a system stream to the recording device 4. Recording device 4
Converts the input system stream into, for example, a DVD-
The information is recorded in the RAM 5.

Next, the operation of the embodiment configured as described above will be described.

The camera 6 captures an image of a subject and outputs a video signal based on the captured image to the MPEG encoder 7. M
The video signal of the image captured by the PEG encoder 7 is MP
The video stream is converted into an EG2 standard video stream and supplied to the systematic circuit 3.

On the other hand, the date and time generating circuit 8 obtains date and time information from the clock device and sequentially outputs the information to the bit map generating circuit 9. The bitmap generation circuit 9 generates bitmap data for displaying a date and time based on the date and time information. The date-only bitmap data, the time-only bitmap data, and the bitmap data indicating the date and time are supplied to the sub-picture encoder 10 and converted into a sub-picture stream. The sub-picture stream from the sub-picture encoder 10 is output to the systematic circuit 3.

The systemization circuit 3 packetizes and multiplexes the MPEG2 video stream and the sub-picture stream in a predetermined unit to generate a system stream. This system stream is supplied to the recording device 4, and the DVD-R
Recorded in AM5.

The system stream recorded on the DVD-RAM 5 includes an MPEG2 video stream and three types of sub-picture streams. The MPEG2 video stream and the three types of sub-video streams are independent of each other, and the sub-video does not cause a part of the video based on the MPEG2 video stream to be lost.

Now, it is assumed that the user projects a captured image recorded on the DVD-RAM 5 on a monitor (not shown). The user can select whether to superimpose and display a sub-image based on the sub-image stream on the image based on the captured image. That is, the user can display only the video based on the MPEG2 video stream, can display the video based on the MPEG2 video stream with the sub video superimposed thereon, and can further display the date as the sub video. , Time or date and time can be selected.

Therefore, for example, when the user selects a date as a sub-picture, a picture on which the date is superimposed can be displayed, and when the picture based on the captured image becomes difficult to see due to the display of the date. , The display of the date can be deleted without affecting the video based on the captured image.

In addition, even when the output of the systemized circuit 3 is directly given to the monitor for projection, the display, non-display or selection of the sub-picture to be displayed, such as date, time and date, can be freely performed. Obviously you can do that.

As described above, in the present embodiment, the additional information is compressed and recorded as a sub-video stream separately from the video stream based on the captured image, and the video based on the captured image is lost. The display or non-display of the additional information can be selected without causing the display. It is also possible to select information to be displayed as additional information.

FIG. 3 is a block diagram showing another embodiment of the present invention. 3, the same components as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, the bit map generation circuit 9
1 in that a sub-picture stream creating unit 22 provided with a sub-picture unit data creating circuit 11 is used instead of the sub-picture encoder 10.

The sub-picture unit data creation circuit 11 outputs the value '0
It has a PXD data table that describes pixel data (hereinafter referred to as PXD data) obtained by compressing twelve bitmap data of numbers 9 to 9 and ':' and '/'. The sub-picture unit data creation circuit 11 reads the PXD data corresponding to the date and time information from the date and time generation circuit 8 from the PXD data table, and creates a sub-picture stream corresponding to the date and time information. The sub-picture unit data creation circuit 11 creates a sub-picture stream containing only the date, a sub-picture stream containing only the time, and a sub-picture stream containing the date and time, and outputs them to the system circuit 3.

In the present embodiment, too, the sub-picture unit data creation circuit 11 additionally arranges sub-picture unit data for the same date data at a predetermined interval in order to quickly return the display of the date and the like. Creates a stream. This makes it possible to set the non-display period of the date data, which is the sub-picture, to a relatively short time even when the reproduction is performed from the middle of the stream.

In the embodiment configured as described above, the date, date,
A time and date and time sub-picture stream are created. These sub-video streams are supplied to the systemization circuit 3 and multiplexed with the MPEG2 video stream from the MPEG encoder 7.

Other functions are the same as those of the embodiment shown in FIG.

It is apparent that the same effects as those of the embodiment shown in FIG. 1 can be obtained in this embodiment.

FIG. 4 is a block diagram showing a video editing apparatus according to one embodiment of the present invention. 4, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. The present embodiment is an example in which a video camera capable of recording additional information in a part of an audio recording area is used, and the additional information is converted to a sub-picture stream based on data from the video camera. .

The video camera 25 comprises a camera 6, a date / time generating circuit 8, a character recording circuit 16, and a multiplexing circuit 12. The camera 6 outputs a video signal based on the captured image to the multiplexing circuit 12. The date and time information from the date and time generating circuit 8 is supplied to the character recording circuit 16. The character recording circuit 16 creates additional information data in a format including an identification code representing character data, date and time information data, and an end code, and outputs the additional information data to the multiplexing circuit 12 so as to be recorded in the audio recording area. I have. Note that the character recording circuit 16 may employ a character code instead of an identification code representing character data.

The multiplexing circuit 12 multiplexes the video signal from the camera 6 and the additional information data from the character recording circuit 16 and outputs the multiplexed signal to the transmission line 13. Note that the multiplexing circuit 12 arranges the additional information data in the audio recording area.

The video editing device 26 comprises a demultiplexing circuit 14, a video stream creating section 23, a sub-picture stream creating section 24, and a systemizing circuit 3. The signal transmitted via the transmission path 13 is supplied to a demultiplexing circuit 14. The separating circuit 14 separates the video signal and the additional information data in the audio recording area from the received signal. The video signal separated by the separation circuit 14 is supplied to the MPEG encoder 7 constituting the video stream creation unit 23,
The additional information data is provided to the bitmap generation circuit 9 constituting the sub-picture stream generation unit 24.

The additional information adding circuit 15 can output additional information additional data for adding, editing, and processing character information and the like to the additional information data supplied to the bitmap generation circuit 9. It has become. This makes it possible to add comment information and the like to the date and time information obtained by the character recording circuit 16. The bitmap generation circuit 9 generates bitmap data based on the input information and outputs the bitmap data to the sub-picture encoder 10. For example, the bitmap generation circuit 9 generates a character code,
Bitmap data is created based on information such as a display position, a display color, and a display time.

It is apparent that a recording / reproducing device such as a VTR may be used instead of the transmission line 13.

Next, the operation of the embodiment configured as described above will be described.

The video signal based on the image captured by the camera 6 is supplied to the multiplexing circuit 12. The date and time generating circuit 8 generates date and time information and outputs it to the character recording circuit 16. Additional information data including date and time information data is created by the character recording circuit 16, and the additional information data is output to the multiplexing circuit 12 so as to be recorded in the audio recording area. The multiplexing circuit 12 multiplexes the video signal and the additional information data. In this case, the additional information data is arranged in the audio recording area.

The signal which is imaged by the video camera 25 and multiplexed with the additional information data by the multiplexing circuit 12 is supplied to the demultiplexing circuit 14 of the video editing device 26 via the transmission line 13. The separating circuit separates the video signal and the additional information data from the received signal. Additional information data is MP
MPEG2 encoded by the EG encoder 7
Converted to video stream.

On the other hand, the additional information data separated by the separation circuit 14 is supplied to the bitmap generation circuit 9 and is subjected to addition, editing, and processing by the additional information addition circuit 15. For example, when newly adding character information, the additional information adding circuit 15 outputs information such as a character code, a display position, a display color, and a display time to the bitmap generation circuit 9.

The bit map generation circuit 9 includes a separation circuit 14
And generates bitmap data based on the additional information data separated. Further, the bitmap generation circuit 9
Generates bitmap data based on the additional information data added, edited, and processed by the additional information adding circuit 15 and inserts the bitmap data into bitmap data based on the output of the demultiplexing circuit 14 to form one data file. The created bitmap data is converted by the sub-picture encoder 10 into a sub-picture stream.

The sub-picture stream from the sub-picture encoder 10 and the MPEG2 video stream from the MPEG encoder 7 are multiplexed as a system stream in the systemization circuit 3, and the DVD-RA
Recorded in M5.

The system stream recorded on the DVD-RAM 5 includes a separately encoded video stream and sub-picture stream. Thus, at the time of reproduction, display and non-display of the additional information recorded as the sub-video stream can be switched without losing the image of the captured image recorded as the video stream.
In addition to the character information from the video camera 25, information added by the additional information adding circuit 15 can be displayed.

As described above, in the present embodiment, the video signal and the additional information data are separated, and a sub-video stream based on the additional information data is created.
For example, a system stream of the DVD video standard can be created. Thus, the display and non-display of the date and time can be freely performed even when the reproduction is performed by a general reproduction-only DVD player without using a special reproduction device that separates and reproduces the additional information from the audio recording area. Can be done.

In this embodiment, an example has been described in which the bitmap generation circuit 9 generates one bitmap data, but it is apparent that a plurality of bitmap data may be generated. Also, when the video signal obtained by the demultiplexing circuit 14 is an MPEG2 video stream, it is clear that the MPEG encoder can be omitted.

FIG. 5 is a block diagram showing another embodiment of the present invention. 5, the same components as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, the bit map generation circuit 9
4 in that a sub-picture stream creation unit 28 having a sub-picture unit data creation circuit 11 is used instead of the sub-picture encoder 10.

The sub-picture unit data creation circuit 11 outputs the value '0
It has a PXD data table that describes PXD data obtained by compressing 12 bitmap data of numbers “-9” and “:” and “/”. The sub-picture unit data creating circuit 11 reads the input additional information data and the PXD data corresponding to the additional information additional data from the PXD data table, and creates a sub-picture stream corresponding to the information. .

Also in the embodiment configured as described above, the sub-picture unit data creation circuit 11 creates a sub-picture stream similar to that shown in FIG. The sub-picture stream is supplied to the systemization circuit 3 and multiplexed with the MPEG2 video stream from the MPEG encoder 7.

The other operations are the same as those of the embodiment shown in FIG.

It is apparent that the present embodiment can provide the same effect as the embodiment of FIG.

In each of the above embodiments, an example has been described in which an MPEG2 video stream is created from a video signal from a video camera, and a sub-picture stream is created based on information obtained at the time of imaging by the video camera. Obviously, the present invention can be applied to an example in which an MPEG2 video stream is created from a broadcast signal and a sub-picture stream is created based on information or the like obtained by a television receiver.

[0064]

As described above, according to the present invention, an additional information such as date and time can be freely displayed and hidden.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a video recording apparatus according to the present invention.

FIG. 2 is an explanatory diagram for explaining the embodiment in FIG. 1;

FIG. 3 is a block diagram showing another embodiment of the present invention.

FIG. 4 is a block diagram showing an embodiment of a video editing device according to the present invention.

FIG. 5 is a block diagram showing another embodiment of the present invention.

FIG. 6 is a block diagram showing a conventional video recording device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Video stream preparation part, 2 ... Sub-picture stream preparation part, 3 ... Systemization circuit, 4 ... Storage device, 5 ... DVD
-RAM, 6 ... Camera, 7 ... MPEG encoder, 8 ...
Date and time generation circuit, 9: bitmap generation circuit, 10: sub-picture encoder

Claims (5)

[Claims] 1. A video camera device that obtains a video signal based on a captured image by capturing an image, and MPEG-encodes the video signal to create a video stream, based on at least additional information data including information obtained at the time of the image capturing. Sub-video stream generating means for generating a sub-video stream, multiplexing means for multiplexing the video stream and sub-video stream to generate a system stream, and recording the system stream generated by the multiplexing means on a recording medium A video recording device comprising: 2. The apparatus according to claim 1, wherein the sub-image stream generating unit includes a bit map generating unit that generates bit map data based on the additional information data, and a sub-image encoding unit that compresses the bit map data. The video recording device according to claim 1. 3. The sub-picture stream creating means includes: a pixel data table for storing pixel data obtained by compressing bitmap data; and sub-picture unit data based on pixel data read from the pixel data table based on the additional information data. 2. The video recording apparatus according to claim 1, further comprising a sub-video unit data generating means for generating a sub-picture unit. 4. The video recording apparatus according to claim 1, wherein the additional information data includes date and time data obtained from a clock device included in the video camera device. 5. A demultiplexer for receiving a signal in which a video signal and additional information data are multiplexed and separating the video signal and the additional information data, a video stream from the video signal output by the demultiplexer. A video stream creating means for creating, a sub-picture stream creating means for creating a sub-picture stream based on the additional information data output by the demultiplexing means, and a system stream created by multiplexing the video stream and the sub-picture stream. A video editing apparatus, comprising: a multiplexing unit for outputting.