JP2008271175A - Video reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video reproducing device which applies viewing limitation even to video software with no viewing limitation provided and displays closed caption even if viewing limitation is performed. <P>SOLUTION: The video reproducing device 10 which displays closed caption on a display device 16, where the closed caption includes viewing limitation, includes a closed caption judgement part 19 for judging whether the expression of the closed caption is appropriate, and a closed caption converting part 22 for converting the expression of the closed caption when it is judged that the expression of the closed caption is not appropriate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a video playback apparatus, and more particularly to a video playback apparatus in which a parental lock function is provided for displayed subtitles.

Some DVD video software has a parental lock function for restricting viewing of information that is undesirable for children, such as violent expressions.
In the parental lock system, the parental level consisting of eight levels is embedded in the DVD video software, the parental level is set by the playback device, and the parental level DVD video software higher than the set level is played back When this is done, age viewing is restricted by automatically cutting content that is undesirable for children. For example, if the playback device is set to the parental level 5, DVD video software of the parental level 5 or higher cannot be played back. If the playback device is set to the parental level 2, the DVD video software of the parental level 2 or higher becomes more severe. Cannot play.

Parental lock has become a very important function in view of the adverse effects on children in the midst of flooding of video software.
However, the parental lock is not embedded in all video software, and even a playback device having a parental function may not restrict viewing.
On the other hand, when viewing is restricted by parental lock, content is cut, so even if it is useful video software as a whole, for example, if there is a cruel scene in that video software Some of the scenes are not displayed, and the video software cannot be fully appreciated without understanding the contents.

  In Patent Document 1, the display of only a part of the entire video screen based on the video data recorded on the recording medium is prohibited, and the video is blurred or part of the plurality of audio streams. There has been proposed a recording medium playback apparatus that prohibits parental playback of audio streams only or prohibits parental prohibition of only some of the subtitle streams among a plurality of subtitle streams.

In this recording medium playback device, a parental control flag is provided on the optical disc, and when the parental control flag for the video signal is detected in the recording medium playback device, the screen size is forcibly enlarged, and the image is displayed in the actual screen size. A part of the image is not displayed so as to protrude from the outside.
In addition, when a parental control flag for a subtitle stream is detected, the subtitle stream separation circuit is prohibited from displaying subtitles by prohibiting the subtitle stream separation processing.

  In Patent Document 2, harmful phrase information and personal information of a user who has viewing authority are stored in a memory in advance, and after the reproduction process for the optical disc is started, the audio information and subtitle information read from the optical disc are stored. On the other hand, there has been proposed an optical disk reproducing apparatus that realizes parental lock by determining whether or not harmful words are included. In this optical disk playback device, when harmful words are included and no personal information is input, the sound and subtitles of the harmful words are muted, and the video related to the harmful words is muted or unclear. ing.

JP-A-8-180418 JP 2005-86483 A

However, the recording medium playback device described in Patent Document 1 is for preventing a part of the educational video software in which a problem and an answer are described, for example, an answer part for the problem from being displayed on the screen. It is not intended to prevent typical expressions from being displayed.
Even if this recording medium playback device is applied to video software such as music or movies, if the subtitles are prohibited from parental, the subtitles will not be displayed completely. For example, if the video software is a movie, the story can be understood. It will not be possible to fully enjoy the video software.
In this recording medium playback apparatus, the parental control flag must be provided in advance in the video software.

The optical disk playback device described in Patent Document 2 is from the same applicant as the applicant of the present invention, but the present invention proposes a subtitle display method different from that of the optical disk playback device described in Patent Document 2. Is.
That is, in the invention described in Patent Document 2, if a harmful word or phrase is included in subtitles or audio, the subtitle is not displayed, the audio is muted, and the video is also unclear at this time.

However, for example, when extracting only a part, such as highly artistic video software, even if it seems that harmful contents such as cruel scenes are included, it is very useful as a whole There are also some video software.
Therefore, when a harmful word or phrase is included in a caption, if the caption is not displayed, sound including sound effects and BGM cannot be heard, and the video is unclear, there is a serious problem that the content cannot be viewed.

  In view of such a situation, the present invention provides a video playback apparatus in which a viewing restriction is performed even for video software without a viewing restriction and a caption is displayed even when the viewing restriction is performed. With the goal.

In order to achieve the above object, the present invention takes the following technical means.
In the present invention, in a video playback device in which subtitles are displayed on a display device and viewing restrictions are provided on the subtitles, a subtitle determination unit that determines whether the expression of the subtitles is appropriate, and the subtitle determination unit, If the subtitle expression is determined to be inappropriate, a subtitle conversion unit that converts the subtitle expression is provided.

  In this way, since the video playback device has all the functions of viewing restriction, even video software without viewing restriction can be restricted. In this case, if a parental lock is applied that simply deletes the subtitles, for example, if the movie is a movie, the story cannot be understood and the content cannot be fully appreciated. When the subtitle expression is inappropriate when the subtitle conversion unit is provided, the inappropriate subtitle expression is converted into an appropriate subtitle expression and displayed on the display device. Can understand movie stories and fully appreciate the content.

In the video reproduction apparatus according to the present invention, subtitles are included in the subtitle stream of the disc, and the subtitle stream is pre-read and the subtitle conversion unit converts the subtitle expression.
In this way, since the subtitle expression is pre-read and converted, the subtitle is not displayed with a delay from the video or audio. For example, when a character in the content speaks, the character's mouth moves and a voice can be heard, but subtitles are displayed at the timing of the mouth's movement and utterance. It will not be displayed late, making it easier to understand the content and allowing you to fully appreciate the video software.

In the video reproduction apparatus according to the present invention, the subtitle stream after being converted by the subtitle converter is compressed.
In this way, since the subtitle stream is compressed, the memory in which the subtitle data is stored can be reduced. That is, for example, in DVD video software, subtitle data is reversibly compressed as a subtitle stream by run-length conversion and stored on the disc. The compressed subtitle is once decompressed and then subtitled by the subtitle converter. Convert. At this time, since the caption data becomes large, if the compressed data is stored again until the reproduction time is reached, the memory consumed can be reduced. Note that the recompression in this case is preferably lossless compression in which data is completely restored upon decompression, such as run length conversion.

The video playback apparatus according to the present invention is provided with a password determination unit that determines whether to perform normal processing or to convert the subtitle expression.
In this way, normal processing is performed when the correct password is input, and the subtitle expression is converted when the correct password is not input. Therefore, if the correct password is entered, the video software can be viewed while watching the subtitles that are not parental locked. In addition, when a person who does not know the password, for example, a child watches, any video software automatically converts subtitles that are inappropriate for the child. It can be installed and used inside.

The present invention is effective when the video playback device is a DVD playback device.
In DVD-Video software, subtitles are run-length converted and compressed and stored as pixel data in the sub-picture pack in the playback stream, so the subtitle stream as described above is pre-read, decompressed, and converted to subtitles. It is suitable for later recompression.

  According to the present invention, it is possible to obtain a video playback device that displays a subtitle even when viewing is restricted even for video software that is not provided with viewing restriction.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram of a video playback apparatus 100 of the present invention. As shown in FIG. 1, in this video reproducing apparatus 100, a disk 1 is rotated by a spindle motor 2, and a reproduction signal is taken out from the rotating disk 1 by an optical pickup 3. The spindle motor 2 is controlled by a servo control unit 4. Then, the reproduction signal obtained by the optical pickup 3 is input to the RF amplifier 5 and amplified. In the following description, the disc 1 is a DVD (Digital Versatile Disk), but other video software capable of reproducing subtitles and videos may be used.

  The reproduction signal amplified by the RF amplifier 5 is subjected to signal processing and error correction processing according to the data format of the disk 1 by the digital signal processing unit 6 and stored in a RAM (Random Access Memory) 7a. Thereafter, the stream separation unit 9 separates the reproduction signal output from the digital signal processing unit 6 into a video stream, a sub-picture stream, and an audio stream in response to an instruction from the control system 8. Subtitle information is included in this sub-picture stream.

  The audio stream and the video stream are respectively input to the audio decoder 10 and the video decoder 11 and decoded (decompressed). The sub-picture decoder / encoder 12 has a sub-picture stream decoding function and an encoding (compression) function. Therefore, the sub-picture stream input to the sub-picture decoder / encoder 12 can be encoded again after being decoded. The audio decoder 10, the video decoder 11, and the sub-picture decoder / encoder 12 are connected to RAMs 7b to 7d for temporarily storing data. By temporarily storing data in the RAMs 7b to 7d, video, audio, and subtitles in the same scene are output at the same time, so that the output can be seamless.

A signal decoded as audio data by the audio decoder 10 is converted from a digital signal to an analog signal by the D / A converter 13 and output from the speaker 24.
Video data generated by the video decoder 11 and subtitle data generated by the sub-picture decoder / encoder 12 are combined by the video processor 14. The output from the video processor 14 is input to the video encoder 15, converted into a video signal for display, and displayed on the display device 16. The speaker 24 and the display device 16 may be external devices of the video reproduction device 100.

The control system 8 that manages the entire system of the video playback apparatus 100 determines whether or not the subtitle expression is appropriate, and determines whether or not the input password is correct. It is not preferable for a child, a password determination unit 20 that determines whether to convert the subtitle expression or perform normal processing with a password, a normal processing unit 21 that performs normal processing when a correct password is input, and a child. That is, a subtitle conversion unit 22 that converts a subtitle with an inappropriate expression into a subtitle with an appropriate expression is provided.
An operation input unit 23 is connected to the control system 8. A password is input from the operation input unit 23, a playback instruction for the disc 1 is given, and a language for subtitles and audio, for example, Japanese is selected. can do.

The CPU 18 connected to the control system 8 performs a calculation for controlling the video reproduction apparatus 100. A flash ROM (Read Only Memory) 17 stores subtitle information inappropriate for children, proper subtitle information, and various control information performed by the control system 8.
Inappropriate subtitles and appropriate subtitle information are recorded in the flash ROM 17 in advance, but can be added or deleted from the operation input unit 23.

  FIG. 2 is a diagram hierarchically showing the data structure of the DVD. FIG. 2A shows a volume space of the disk 1, and the volume space is composed of a volume and file configuration zone, a DVD video zone, and other zones. As shown in FIG. 2B, the DVD video zone includes a video manager VMG and video title sets VTS # 1 to VTS # n.

  The video manager VMG is a table representing the contents of all video title sets, and is composed of control data called video manager information, a video object set for displaying a VMG menu, and control data for backup (see FIG. Not shown). The video title set VTS (# 1 to #n) is a set of titles. As shown in FIG. 2C, each VTS has control data called video title set information VTSI and VTS menu display. It consists of a menu video object set VOBS, a video video object set VOBS for displaying video, and a video title set information VTSI for backup.

  The video object set VOBS for video of the video title set VTS is composed of a plurality of video objects VOB as shown in FIG. The video object VOB is a basic unit of content to be reproduced, and video switching is performed in units of the video object. The video object VOB includes video data, audio data, sub-picture data, PCI (Presentation Control Information) data, and DSI (Data Search Information) data. Each data is completed by the video object VOB. PCI data and DSI data are control information.

Each video object VOB is composed of a plurality of video object units VOBU as shown in FIG. This video object unit VOBU is a pack sequence in the recording order, and has a reproduction time of 0.4 to 1.2 seconds. Each video object unit VOBU includes a navigation pack NV_PCK, an audio pack A_PCK, a video pack V_PCK, and a sub-picture pack SP_PCK, as shown in FIG. 2 (f). The navigation pack NV_PCK corresponds to the aforementioned PCI data and DSI data.
The video object unit VOBU always has a navigation pack NV_PCK at the head, and other packs may be one, may be plural, or may not exist.

The navigation pack NV_PCK is placed at the head of the video object unit VOBU, and is mainly used as control data for performing playback display control and data search in the video object unit VOBU to which the navigation pack NV_PCK belongs. The video pack V_PCK is main video data obtained by compressing a video signal according to the MPEG standard. The audio pack A_PCK is audio data obtained by processing an audio signal by the PCM method or the like.
The sub-picture pack SP_PCK is sub-picture data obtained by subjecting a signal such as a caption to a run-length compression process.

  Subtitles are converted using subtitle data which is a sub-picture built in the sub-picture pack SP_PCK. The header of each sub-picture pack stores the stream ID of the sub-picture stream composed of the sub-picture pack. A sub-picture stream with the same stream ID is assembled into one sub-picture stream. It is formed. And the subtitle language is different for each stream, such as Japanese, English, French, etc. For example, when subtitle is set to Japanese, only the subtitle data of the stream corresponding to Japanese is prefetched and acquired. The subtitle data of the stream corresponding to the other language is discarded. If the Japanese subtitle expression is inappropriate, it is converted from an inappropriate expression to an appropriate expression.

  FIG. 3 is a flowchart showing a disc playback procedure in the video playback apparatus 100. As shown in FIG. 3, when playback of the disc 1 is instructed from the operation input unit 23 (FIG. 1) (step S1), the password determination unit 20 determines whether or not a correct password is input (step S2). . If the correct password has been input (YES in step S2), the normal processing is performed without converting the caption expression (step S3). By providing a password, it is possible to prevent a child from canceling the restriction of subtitles and to cope with the case where the subtitle expression is not converted.

  Next, if the correct password has not been entered (NO in step S2), the data recorded on the disc 1 is prefetched sequentially, and the video pack, audio pack, and sub-picture pack data are sorted by type and video. The packs are collected to generate a video stream (step S4), the sub-picture packs are collected to generate a sub-picture stream (step S5), and the audio packs are collected to generate an audio stream (step S6).

  As described above, a sub-picture pack of DVD video software stores subtitles as run-length converted pixel data. Accordingly, the subtitle decoder / encoder 12 decodes the subtitle data (step S7), the decoded subtitle is read, and the subtitle determination unit 19 determines whether the subtitle expression is appropriate for the child (step S8). ). This determination is made by referring to the caption information stored in the flash ROM 17.

  If the subtitle expression is inappropriate for children (NO in step S8), subtitle conversion is performed (step S9). For example, violent expressions are converted into non-violent expressions. This subtitle expression conversion is performed so that the converted expression falls within a predetermined number of characters. In other words, the number of characters that a person can read per unit time is limited, so that the subtitle representation is converted according to the number of characters, and there is no loss of reading when the converted subtitle is displayed. Like that. If the caption expression is not particularly problematic and appropriate for the child (YES in step S8), caption conversion is not performed. When the caption conversion function is provided in this way, it is possible to reduce the expression that is not preferable for children as subtitles, and to reduce adverse effects on children. Also, if you simply delete subtitles that are not desirable for children, you will not be able to fully watch the video software, but the subtitles may be unnaturally interrupted during viewing because the expressions will be converted and displayed as subtitles. Absent. Furthermore, since the video reproduction device 100 is not limited to the subtitles, not the disc 1, it is not necessary to provide a parental lock on the disc 1, and all video software can be supported.

  Then, the subtitle data after conversion is encoded again by run-length conversion in the sub-picture decoder / encoder 12 (step S10). In this case, subtitle data that is not converted and subtitle data whose expression is converted may be combined and encoded, or the subtitle data may be encoded again without being converted. The data once decoded (decompressed) in this way is reversibly compressed by run-length conversion after conversion, so that the consumed memory (RAM 7d in FIG. 1) can be saved.

Next, when the playback time comes, the encoded video stream, sub-picture stream, and audio stream are decoded (step S11, step S12, and step S13), and main video data, subtitle data, and audio data are created, respectively. (Step S14, Step S15, Step S16).
As described above, the subtitle data (sub-picture stream) is pre-read and it is determined whether or not the subtitle expression is appropriate for the child. If the subtitle data is inappropriate, the subtitle data is converted and the playback time is reached. Are displayed together with the main video data, and sound is output. Therefore, it is possible to prevent the subtitles after conversion from being displayed with a delay with respect to video and audio.

  Then, by synthesizing the main video data and the converted subtitle data as video data (step S17), video data including the main video and the subtitle is created, and the synthesized video data is displayed on the display device 16 ( 1) (step S18). On the other hand, the created audio data is output to the speaker 24 (step S19).

  The present invention is not limited to the above-described embodiment. In the above-described embodiment, subtitles with inappropriate expressions are uniformly converted, and it is not possible to set an inappropriate subtitle level according to each age such as 15 years old or over, but over 18 years old. A level such as 18 years or older may be set. In this case, when the correct password is input by the operation input unit 23, the levels 1 to 8 may be changed. A level is also provided for each expression in the inappropriate subtitle information built in the flash ROM 17 so that the subtitle conversion unit 22 performs subtitle conversion according to the level set by the operation input unit 23. .

  Further, the encoding and decoding timing may be performed within a range that does not impair the gist of the present invention. In addition to re-encoding the converted subtitles by prefetching one after another as described above, the subtitle expression is converted to match the actual playback time, and the subtitles are displayed without encoding again. It is included in the scope of the present invention.

It is a block diagram of the video reproduction apparatus of this invention. It is the figure which showed the data structure of DVD hierarchically. It is the flowchart which showed the procedure of disk reproduction.

Explanation of symbols

1 Disc 19 Subtitle Determination Unit 22 Subtitle Conversion Unit 100 Video Playback Device

Claims (5)

In a video playback device in which captions are displayed on a display device and viewing restrictions are provided on the captions,
A subtitle determining unit that determines whether the expression of the subtitle is appropriate;
A video playback device comprising: a subtitle conversion unit that converts the subtitle expression when the subtitle determination unit determines that the subtitle expression is inappropriate. The video playback apparatus according to claim 1,
The subtitles are included in the subtitle stream of the disc;
A video playback apparatus, wherein the subtitle stream is pre-read and the subtitle conversion unit converts the subtitle expression. The video reproduction apparatus according to claim 1 or 2,
A video reproduction apparatus, comprising: compressing a subtitle stream after being converted by the subtitle conversion unit. In the video reproduction device according to any one of claims 1 to 3,
A video playback apparatus characterized in that a password determination unit is provided for determining whether to perform normal processing or to convert a subtitle expression. The video reproduction apparatus according to any one of claims 1 to 4,
A video playback device, wherein the video playback device is a DVD playback device.

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