JPH11298854A - Coding image recording and reproducing device used for authoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a coding image recording and reproducing device used for an authoring system where a video bit stream is retrieved at a high speed, reproduced information is served and a job time for authoring is reduced. SOLUTION: A header detector 14 detects a stream header SH from a received video bit stream. A coded data counter 12 outputs number of bytes, from the head, of an output video bit stream from a coder 11 when the counter 12 receives a detection signal from the header detector 14 and a reproduction time code from a VTR 10 as coding incidental information to a file server 16, where the information is stored. A video bit stream from a buffer 15 is fed to the file server 16, where it is stored separately from the coding incidental information. After the end of storage by the file server 16, the user 18 enters the time code by a manual TC entry device 13, and the file server 16 can be retrieved at a high speed by using the time code as an address.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an encoded image recording / reproducing apparatus used in an authoring system, and more particularly to an MPE.
A coded image recording / reproducing apparatus used in an authoring system for generating a multiplexed bit stream and recording it on a storage medium such as a DVD (Digital Virsatile Disk) in accordance with a digital moving picture coding standard such as G (Moving Picture Expert Group) 2. About.

[0002]

2. Description of the Related Art VIDEO-CD, DVD-VIDEO
When producing storage media, such as movie videos, music videos, and other types of video material,
An individual encoded stream obtained by separately encoding the video of the video material and related information such as background sound corresponding to the video, dubbing in a plurality of languages, and subtitles in a plurality of languages according to a coding standard is converted to a digital moving image such as MPEG2. The multiplexed bit stream is recorded on a storage medium using an authoring system that generates a multiplexed bit stream by multiplexing according to an image coding standard.

FIG. 3 is a block diagram showing an example of a conventional coded image recording / reproducing apparatus used in an authoring system.
In FIG. 1, a digital image signal extracted from a digital image source 1 is converted into an MPEG signal by an image encoding device 2.
After being encoded according to a digital video encoding standard such as 2 or the like, it is recorded on a file server 3 such as a hard disk drive (HDD) or supplied to an image decoding device 4.

An image decoding device 4 decodes a bit stream directly supplied from the image encoding device 2 or a bit stream read from the file server 3 and converts the obtained image signal into a cathode ray tube (CRT). Display device 5 such as
To be displayed. The image quality inspector visually checks the image quality of the image displayed on the display device 5 as well as the grammatical inspection of the stream. At this time, the position of the MPEG-video stream such as a portion where image quality distortion is concerned is recorded by a time code, and the position is checked again later.

In this case, since the conventional MPEG-video stream alone does not have a time code table, a predetermined image position is searched for while reading and decoding data sequentially from the head, and the image to be reconfirmed is read. Is detected and displayed.

Here, the MPEG-video stream will be described. FIG. 4 is a diagram showing a configuration of an MPEG-video stream. A video bit stream includes a sequence layer, a group of pictures (GOP) layer, a picture layer,
It has a hierarchical structure of a slice layer, a macroblock layer, and a block layer. As shown in FIG. 4A, the sequence layer has a configuration in which a sequence header SH specifying a screen format and the like and a GOP are combined.

As shown in FIG. 4B, the GOP layer includes an I picture which is an intra-frame coded image, a P picture which is an inter-frame forward prediction coded image, and a B picture which is a bidirectional prediction coded image. A picture layer is composed of a picture and a header GOPH at the head of the picture layer.
GOP is the minimum unit of an image group that is a unit of a search operation.

The header GOP arranged at the top of the
H is, as shown in FIG. 4C, a group start code (GSC) which is a start code of a GOP, and a time code (T
C) and a closed GOP (CG) which is a flag indicating that the image in the GOP can be reproduced independently from another GOP.
And a broken link (BL) which is a flag indicating that the first B picture of the GOP cannot be accurately reproduced for editing or the like.

In the image decoding apparatus 4 used in the authoring system shown in FIG. 3, the start address of SH (the number of bytes from the start of the video stream) and TC or GO
The start address of P (the number of bytes from the start of the video stream) and TC are calculated from the video bit stream, and a table is created in advance. In the conventional authoring system, an image quality inspector (user) performs a high-speed search while designating a TC or viewing an image, and reexamines a portion having an image quality problem.

A portion having image quality distortion due to the re-examination of the image is replaced with a new image again and recorded on the file server again. And other background sounds, dubbing in multiple languages,
In the same manner, individual encoded streams obtained by separately encoding related information such as subtitles in multiple languages according to the encoding standard are recorded in the file server, and each individual encoded stream read from those file servers is multiplexed. After that, it is recorded on the storage medium to produce the storage medium.

[0011]

However, in the coded image recording / reproducing apparatus used in the above-mentioned conventional authoring system, a video bit stream is once output in order to visually inspect a defective image again. It is necessary to search from the top, calculate the top address of the GOP, and create a database of the relationship between TC and address.
Retrieving a video bitstream takes an extremely long time, which places a heavy burden on authoring work time.

The present invention has been made in view of the above points,
It is an object of the present invention to provide a coded image recording / reproducing apparatus used in an authoring system capable of providing information for retrieving and reproducing a video bit stream at a high speed and shortening an authoring work time.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an encoder for generating a video bit stream including a header from a digital image signal reproduced from a recording medium, and an encoder extracted from the encoder. Header detecting means for detecting a predetermined header from the obtained video bit stream, and counting the video bit stream taken out of the encoder in units of a predetermined number of bits from the head thereof, and detecting the time code reproduced from the recording medium. Receiving, a video bit stream count value at the time of detection signal input from the header detection means, and a coded accompanying information generating means for obtaining a reproduction time code as coded information; a video bit stream extracted from the coder; A file server in which each of the coded accompanying information is recorded, and a video file read from the file server. Image decoding means for decoding the bit stream, a display device for displaying an image signal from the image decoding means, input means for inputting a desired time code from outside, and input from the input means after recording to the file server is completed. The received time code and the encoded accompanying information reproduced from the file server are received, and the recorded video bit stream of the file server is reproduced from the time code recording position in the reproduced encoded accompanying information near the input time code and supplied to the image decoding means. And control means for performing the control.

According to the present invention, the encoding accompanying information is recorded in the file server together with the video bit stream extracted from the encoder. Therefore, after the recording in the file server is completed, the input means detects the desired image position. Just by inputting the time code, the recorded video bit stream of the file server can be reproduced from the time code recording position in the reproduction encoding accompanying information near the input time code.

Further, the present invention further comprises a manual input device for storing a playback time code of a recording medium at the time of operation by a user's manual operation when a video bit stream and encoded accompanying information are recorded in a file server. It has a configuration to have. According to the present invention, image recording position data for image quality inspection can be easily input.

[0016]

Next, embodiments of the present invention will be described with reference to the drawings. The overall configuration diagram of the encoded image recording and playback device used in the authoring system according to the present invention,
Although the configuration is the same as that shown in FIG. 3, the configurations of the image encoding device 2 and the image decoding device 4 are different from those of the related art.

FIG. 1 is a block diagram showing an embodiment of an image encoding apparatus which is a recording system of an encoded image recording / reproducing apparatus used in the authoring system according to the present invention. In the figure, a VTR 10 in an image encoding device 9 (corresponding to the image encoding device 2 shown in FIG. 3) has a recorded magnetic tape on which a digital image signal such as a desired program and a time code are recorded in advance. The reproduced digital image signal is supplied to an encoder 11, and the reproduced time code is supplied to an encoded data counter 12 and a manual TC input device 13.

An encoder 11 in the image encoding device 9 encodes the input digital image signal according to a digital video encoding standard such as MPEG2, and generates the video bit stream shown in FIG. The video bit stream is supplied to an encoded data counter 12, a header detector 14, and a buffer 15, respectively. The header detector 14 detects a sequence header (SH) from the input video bit stream, and supplies a detection signal to the coded data counter 12.

The coded data counter 12 in the image coding device 9 counts the number of bytes from the head of the video bit stream from the coder 11, and when the above detection signal is input, the data is counted. Number of bytes from the beginning of the video bit stream at the time of detection signal input (SH start address)
And the reproduction time code from the VTR 10 at the time of input of the detection signal as image position data (encoded accompanying information), respectively, as a file server 16 (corresponding to the file server 3 in FIG. 3) which is a recording medium such as a hard disk drive (HDD). ) And record.

On the other hand, the buffer 15 in the image encoding device 9
Is temporarily output to an image decoding device, which will be described later, via an output terminal 19, and is supplied to the file server 16 to be recorded separately from the image position data.

An image signal obtained by decoding a video bit stream output from the output terminal 19 by an image decoding device described later is displayed on a display device, and a creator (user) who views the displayed image. ) 18 requires manual T every time an image of interest such as a portion having image quality distortion is displayed.
The C input device 13 is operated. As a result, the reproduction time code from the VTR 10 at the time of the operation is recorded in the manual input device 13. The manual TC input device 13 is constituted by a personal computer or the like, and has a function of displaying the recorded playback time code on the display device 17 in the form of a list.

Thus, after the recording on the file server 16 is completed, the creator (user) 18 looks at the time code list on the display device 17 and inputs the time code with the manual TC input device 13. Is searched at that time code position at a high speed, so that the image of interest can be instantly reconfirmed.

Next, a description will be given of an image decoding apparatus according to another embodiment of the present invention. FIG. 2 is a block diagram showing an embodiment of an image decoding apparatus which is a reproduction system of an encoded image recording / reproduction apparatus used in the authoring system according to the present invention. In the figure, a switch 21 in an image decoding device 20 (corresponding to the image encoding device 4 shown in FIG. 3) is used to output a signal from the image encoding device 9 in order to monitor an image at the time of the above-described encoding. When the video bit stream is directly decoded, the output video bit stream of the image encoding device 9 connected to the terminal 21a and taken out through the output terminal 19 of FIG. 1 is supplied to the image decoder 22.

On the other hand, when decoding a video bit stream recorded in the file server 16 for image editing or the like, the switch 21 is connected to the terminal 21b to switch the video bit stream reproduced from the file server 16 to the terminal 21b. This is supplied to the image decoder 22. The image decoder 22 decodes the video bit stream input via the switch 21 and displays the obtained image signal on the display device 23
(Corresponding to the display device 5 in FIG. 3) to be displayed.

Next, a case where a video bit stream is reproduced from the file server 16 will be described. After the recording to the file server 16 is completed, the switch 21 is connected to the terminal 2
The connection is switched from 1a to 21b. In addition, the creator (user) 18 looks at a list of time codes including images having large distortions which have been checked in advance and is displayed on the display device 17 in FIG.
When the input is made in step 3, the recording position of the input time code in the file server 16 is searched by the header searcher 24 in FIG.

At this time, the file server 16 to be searched is
Is recorded in the file server 16.
This is performed based on the image position data (encoding accompanying information) including the playback time code of the VTR and the head address of the SH, and the time code input from the manual TC input device 13, and is input from the manual TC input device 13. The closest one before the time of the time code is selected.

From the image position data, the file server 1
6 is determined, and the reproduced video bit stream is set to the switch 2 position.
After being supplied to the image decoder 22 through 1 and decoded, the image is displayed on the display device 23. in this way,
In this embodiment, the search for the reproduction start position is not performed by reproducing and decoding the video bit stream and analyzing the header information but based on the encoding accompanying information. And search operations.

[0028]

As described above, according to the present invention,
By recording the encoding accompanying information in the file server together with the video bit stream extracted from the encoder, after the recording to the file server is completed, the time code of the desired image position is simply input from the input unit, Since the recorded video bit stream of the file server can be reproduced from the time code recording position in the reproduction encoding accompanying information near the input time code, the time code can be simply specified without reproducing / decoding the video bit stream. The special reproduction and search operation of the recorded video bit stream of the file server can be performed. As a result, the special reproduction at the time of authoring can be easily performed, and the search can be performed at high speed. As a result, according to the present invention, the image quality can be inspected in a shorter time than in the past, and the authoring time can be greatly reduced.

According to the present invention, a manual input device for storing a reproduction time code of a recording medium at the time of operation by a user's manual operation when a video bit stream and encoded accompanying information are recorded in a file server. Is provided, image recording position data for image quality inspection can be easily input.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a main part of the present invention.

FIG. 2 is a block diagram of an embodiment of another main part of the present invention.

FIG. 3 is a block diagram of an example of a main part of the authoring system.

FIG. 4 is an explanatory diagram of a format of an MPEG video stream.

[Explanation of symbols]

 2,9 Image encoding device 3,16 File server 4,20 Image decoding device 5,17,23 Display device 10 VTR 11 Encoder 12 Encoded data counter 13 Manual TC input device 14 Header detector 15 Buffer 21 Switch 22 image decoder 24 header searcher

Claims (3)

[Claims] 1. A plurality of individual encoded streams including at least a video bit stream obtained by separately encoding various kinds of information of a desired video material according to an encoding standard,
An encoded image recording / reproducing apparatus used in an authoring system for generating a multiplexed bit stream by multiplexing according to a predetermined moving picture encoding standard, wherein the video bit stream including a header is generated from a digital image signal reproduced from a recording medium. An encoder, a header detecting means for detecting a predetermined header from the video bit stream extracted from the encoder, and a video bit stream extracted from the encoder in units of a predetermined number of bits from the beginning. Encoding accompanying information that counts and receives a time code reproduced from the recording medium, and obtains a count value of the video bit stream when the detection signal is input from the header detection unit and the reproduction time code as encoding information. Generating means; video bits extracted from the encoder A file server on which the stream and the encoded accompanying information are respectively recorded; an image decoding unit that decodes the video bit stream read from the file server; and a display that displays an image signal from the image decoding unit. A device, input means for inputting a desired time code from the outside, and after completion of recording to the file server, receiving the time code input from the input means and the encoded accompanying information reproduced from the file server, An authoring system comprising: control means for reproducing a recorded video bit stream of the file server from a time code recording position in the reproduction-encoding accompanying information near the input time code and supplying the reproduced video bit stream to the image decoding means. Coded image recording / reproducing device used for 2. When recording the video bit stream and the coded accompanying information in the file server,
2. The encoded image recording / reproducing apparatus used in the authoring system according to claim 1, further comprising a manual input device for storing a reproduction time code of the recording medium at the time of operation by a user's manual operation. 3. The video bit stream is an MPE.
G is a coded image data compressed and coded according to the G method, wherein the header detecting means detects a sequence header of the video bit stream, and the coded accompanying information generating means sets the video bit stream as a count value of the video bit stream. 2. The coded image recording / reproducing apparatus used in the authoring system according to claim 1, wherein the number of bytes from the head of the bit stream is counted.