WO2007013778A1 - Recording medium, method and apparatus for reproducing data and method and apparatus for recording data - Google Patents

Recording medium, method and apparatus for reproducing data and method and apparatus for recording data Download PDF

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Publication number
WO2007013778A1
WO2007013778A1 PCT/KR2006/002979 KR2006002979W WO2007013778A1 WO 2007013778 A1 WO2007013778 A1 WO 2007013778A1 KR 2006002979 W KR2006002979 W KR 2006002979W WO 2007013778 A1 WO2007013778 A1 WO 2007013778A1
Authority
WO
WIPO (PCT)
Prior art keywords
video stream
luma
secondary video
keying
primary
Prior art date
Application number
PCT/KR2006/002979
Other languages
French (fr)
Inventor
Kun Suk Kim
Original Assignee
Lg Electronics Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020060037778A external-priority patent/KR20070014948A/en
Application filed by Lg Electronics Inc. filed Critical Lg Electronics Inc.
Publication of WO2007013778A1 publication Critical patent/WO2007013778A1/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
    • G11B27/034—Electronic editing of digitised analogue information signals, e.g. audio or video signals on discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
    • H04N9/8205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
    • H04N9/8205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal
    • H04N9/8227—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal the additional signal being at least another television signal
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2541—Blu-ray discs; Blue laser DVR discs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/84—Television signal recording using optical recording
    • H04N5/85—Television signal recording using optical recording on discs or drums

Definitions

  • the present invention relates to recording and reproducing
  • Optical discs are widely used as a recording medium capable
  • high-density optical recording mediums such as a Blu-ray Disc
  • Such a high-density optical recording medium which is based
  • the present invention relates to a method of managing
  • the management information includes luma-
  • keying function manages transparency of a secondary video
  • the luma-keying information indicates whether the
  • the secondary video stream represents the picture-in-
  • the primary video stream and the secondary video stream are
  • the luma-keying information indicates a
  • the secondary video stream are reproduced such that pixels of
  • the management information includes
  • composition information and the composition information
  • the management information includes
  • composition information and the composition information
  • the present invention also relates to apparatuses for
  • medium having a data structure for managing reproduction of at least one picture-in-picture presentation path.
  • FIG. 1 is a schematic view illustrating an exemplary
  • FIG. 2 is a schematic diagram illustrating a structure of
  • FIG. 3 is a schematic diagram illustrating a data recording
  • FIG. 4 is a schematic diagram for understanding a concept of
  • FIG. 5 is a block diagram illustrating an overall
  • FIG. 6 is a block diagram schematically illustrating an
  • FIGs. 7A and 7B are schematic diagrams illustrating an AV
  • FIGs. 8A to 8C are schematic diagrams illustrating secondary
  • FIG. 9 is a schematic diagram for conceptual understanding of
  • FIG. 10 is a schematic diagram illustrating an exemplary embodiment of secondary video metadata according to the
  • FIG. 11 is a flow chart illustrating an exemplary embodiment
  • FIG. 12 is a schematic diagram for conceptually understanding
  • optical disc as an example recording medium.
  • optical disc as an example recording medium.
  • BD Blu-ray disc
  • HD-DVD high-DVD
  • Storage as generally used in the embodiments is a storage
  • the storage is an element in which the user freely
  • hard disk there are a hard disk, a system memory, a flash memory, and
  • recording medium for example, a BD
  • medium is externally-downloaded data.
  • the recording medium for example, metadata
  • original data the data stored in
  • title used in the present invention means a
  • HDMV High Definition Movie
  • FIG. 1 illustrates an exemplary embodiment of the combined use of an optical recording/reproducing apparatus according
  • the optical recording/reproducing apparatus 10 according to
  • apparatus 10 may be designed to have recording and
  • optical recording/reproducing apparatus 10 will be described in conjunction with, for
  • BD-player for playback of a BD
  • BD-recorder for playback of a BD
  • apparatus 10 of the present invention may be a drive which can be built in a computer or the like.
  • representative external input signals may be digital
  • CP content provider
  • Content as used in the present invention may be the content
  • a certain title may be recorded in an optical disc as original data of the optical disc.
  • an audio stream for example, Korean audio stream
  • Korean audio stream different from the
  • audio stream of the original data may be generated.
  • the audio stream may desire to download the audio stream (for example, Korean
  • additional data referred to as "additional data”.
  • additional data the definition of the original data and additional data is only to classify
  • Data of any attribute may be used as additional data as long
  • FIG. 2 illustrates a file structure for reproduction and management of original data recorded in a BD in accordance
  • the file structure of the present invention includes a root
  • index file "index. bdmv”
  • object file "MovieObject .bdmv”
  • a playlist directory PLAYLIST namely, a playlist directory PLAYLIST, a clip information directory CLIPINF, a stream directory STREAM, an auxiliary-
  • the JAR directory includes JAVA program files.
  • the metadata directory META includes a file of data about
  • Such a metadata file may include a search file and a metadata file for a disc library.
  • Such metadata files are used for efficient search and
  • the BD-J directory BDJO includes a BD-J object file for
  • the auxiliary directory AUXDATA includes- an additional data
  • directory AUXDATA may include a "Sound. bdmv" file for
  • the stream directory STREAM includes a plurality of files of
  • STREAM uses "*.m2ts" as an extension name of stream files (for example, 01000.m2ts, 02000. m2ts, ...) .
  • a stream file for example, 01000.m2ts, 02000. m2ts, ...) .
  • AV stream multiplexed stream of video/audio/graphic information
  • a title is composed of at
  • the clip information (clip-info) directory CLIPINF includes
  • clip That is, a clip is indicative of data including both one stream file “*.m2ts” and one clip-info file “*.clpi”
  • the playlist directory PLAYLIST includes a plurality of
  • Playlist means a combination of playing intervals of clips. Each playing interval is
  • Each of the playitems and subplayitems includes
  • a playlist may be a combination of
  • subplayitem is defined as a "sub path".
  • Each playlist file should include one main path.
  • Each playlist file also includes at least one
  • file is a basic reproduction/management file unit in the overall reproduction/management file structure for
  • a secondary video through a sub path, is referred to as a secondary video.
  • PiP picture-in-picture
  • the backup directory BACKUP stores a copy of the files in the
  • the disc for example, a copy of the index file "index. bdmv”, object files “MovieObject .bdmv” and “BD-JObject .bdmv”, unit
  • the backup directory BACKUP is
  • FIG. 3 illustrates a data recording structure of the optical disc according to an embodiment of the present invention.
  • FIG. 3 recorded structures of information associated with
  • the disc includes a file
  • system information area recorded with system information for
  • the primary video may be multiplexed in the same stream as the primary video, or may be multiplexed in a stream different from that of the
  • This area is referred to as a "management area”.
  • sub path is used to reproduce the secondary video.
  • the type of the sub path used to reproduce the secondary video may be
  • FIGs. 8A to 8C Since the method for reproducing the
  • management area includes information representing the sub
  • FIG. 3 The areas of FIG. 3 are shown and described only for illustrative purposes. It will be appreciated that the
  • present invention is not limited to the area arrangement of
  • FIG. 4 is a schematic diagram for understanding of the
  • the present invention has an object to provide a method for
  • the present invention implements an
  • the secondary video can be reproduced simultaneously with the
  • the reproduction of the secondary video may also be begun at an intermediate time of the reproduction of
  • the primary video It is also possible to display the
  • the secondary videos may be reproduced, separately from one another, during the reproduction of the primary video.
  • the secondary video can be reproduced along with an audio associated with the primary video.
  • FIG. 5 illustrates an exemplary embodiment of the overall
  • the optical recording/reproducing circuit As shown in FIG. 5, the optical recording/reproducing circuit
  • apparatus 10 mainly includes a pickup 11, a servo 14, a
  • the management data includes reproduction
  • the servo 14 controls operation
  • the signal processor 13 receives a
  • signal processor 13 also modulates signals to be recorded,
  • microprocessor 16 controls the operations of the pickup 11,
  • the recording/reproducing unit reads data from an
  • optical disc 30 or storage 15 under the control of a
  • controller 12 and sends the read data to an AV decoder 17b.
  • recording/reproducing unit functions as a reader unit for
  • the recording/reproducing unit also receives an
  • recording/reproducing unit can record video and audio data in
  • the controller 12 downloads additional data present outside
  • the controller 12 produces metadata for managing reproduction of the secondary video, and performs a control
  • the metadata may include information as to whether or not
  • Metadata also include information for specifying pixels to be
  • the optical recording/reproducing apparatus 10 furthermore controls the optical recording/reproducing apparatus 10
  • the playback system 17 includes an AV
  • decoder 17b for decoding an AV signal.
  • 17 also includes a player model 17a for analyzing an object command or application associated with playback of a
  • controller 12 for determining a playback direction
  • the ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇
  • player model 17a may be implemented as including the AV
  • the playback system 17 is the
  • the AV decoder 17b may include a
  • the AV encoder 18 which is also included in the optical signal
  • an MPEG2 transport stream for example, an MPEG2 transport stream, and sends the
  • FIG. 6 is a schematic diagram explaining the playback system
  • Playback system means a collective reproduction processing
  • the playback system is a system which
  • optical recording/reproducing apparatus but also can
  • the playback system 17 may
  • a user event manager 171 includes a user event manager 171, a module manager 172, a
  • a playback control engine 176 a playback control engine 176, a presentation engine 177, and
  • HDMV module 174 and BD-J module 175 has a control function
  • module 174 and BD-J module 175 can separate an associated
  • command or application from the hardware configuration of the playback system, to enable portability of the command or
  • the HDMV module 174 includes a command processor 174a.
  • VM 175 includes a Java Virtual Machine (VM) 175a, and an
  • the Java VM 175a is a virtual machine in which an application
  • the application manager 175b includes an
  • the module manager 172 functions not only to send user
  • a playback control engine 176 analyzes the playlist file actually recorded in the disc
  • the playback control engine 176 includes playback
  • control functions 176a for managing all playback operations, and player registers 176b for storing information as to the
  • GPRs purpose registers
  • control functions 176a mean the playback control engine 176
  • the HDMV module 174 and BD-J module 175 receive user commands
  • HDMV module 174 and BD-J module 175 are identical to HDMV module 174 and BD-J module 175 .
  • the user event manager 171 receives a user command generated
  • the user event manager sends the received user command to the module manager
  • event manager 171 receives a user command generated through a
  • the user event manager sends the received user
  • the playback system 17 of the present invention may also be any one of the playback system 17 of the present invention.
  • the metadata manager 173 includes a metadata manager 173.
  • the metadata manager 173 can perform selection of a title under the control of the user.
  • Meta metadata manager 173 can also provide, to the user, recording
  • the module manager 172 HDMV module 174, BD-J module 175, and
  • the secondary video ' output after being decoded is presented on the secondary video plane.
  • FIGs. 7A and 7B schematically illustrate an AV decoder model according to the present invention.
  • the AV decoder 17b according to the
  • present invention includes a secondary video decoder 730b for
  • the video decoder 730b decodes the secondary video.
  • the secondary video may be recorded in the recording medium 30 in
  • the secondary video may also be supplied to the user.
  • the AV stream is supplied to the AV decoder 17b
  • TS transport stream
  • main transport stream (hereinafter, also referred to as a "main TS
  • sub transport stream referred to as a sub transport stream or sub TS (hereinafter,
  • buffered main stream is depacketized by a source depacketizer
  • the secondary video is separated from other data packets in the main stream by the
  • filter-1 720a may pass through another switching element
  • the buffered sub stream is depacketized by a
  • AV stream is supplied to an associated one of the decoders
  • 720b may pass through another switching element before
  • the primary video is decoded in a primary video
  • audio decoder 73Of and a text decoder 73Og, respectively.
  • FIGs. 8A to 8C illustrate secondary video sub path types according to the present invention.
  • sub path type is determined, taking into consideration the
  • the secondary video is
  • ⁇ out-of-mux' type is referred to as an ⁇ out-of-mux' type.
  • the main path is constituted by four
  • sync_start_PTS_of_PlayItem' which represents a presentation
  • presentation point of the playitem reaches a value referred to
  • Each of the playitems and subplayitems includes
  • the secondary video which is
  • FIG. 8A is supplied to the AV decoder 17b as a sub stream (Sub TS) , whereas the primary video is supplied to the
  • AV decoder 17b as a main stream (Main TS) .
  • Main TS Main stream
  • the main stream is depacketized by the source
  • depacketizer 710a and is then sent to the PID filter-1 720a.
  • the sub stream is depacketized by the
  • the primary video is decoded in a
  • decoder 73Od a secondary audio decoder 73Of, and a text decoder 73Og, respectively.
  • the decoded primary video, secondary video, PG, and IG are reproduced by a primary video plane 740a, a secondary video
  • presentation graphics plane 740c can also reproduce graphic
  • the secondary video is
  • FIG. 8B is different from the sub path type of FIG. 8A in
  • the secondary video which
  • the optical recording/reproducing apparatus 10 can operate irrespective of
  • the secondary video is
  • the main path is constituted by four playitems ( ⁇ PlayItem_id'
  • constituting the sub path includes information for
  • the secondary video is synchronized with the associated playitem, using the above-described information.
  • each of the playitems is synchronized with the primary video.
  • each of the playitems is synchronized with the primary video.
  • the secondary video is supplied to the AV
  • decoder 17b along with the primary video, as a main stream.
  • the main stream which is packetized
  • the secondary video is output from the
  • the controller 12 performs a control operation for displaying the secondary
  • the main stream and sub stream may be supplied from the
  • the primary video may be any different clips, respectively.
  • the secondary video may be downloaded from the
  • plane means a conceptual model for explaining
  • the plane model enables the primary video
  • data supplied from the primary video decoder 730a is reproduced on the primary video plane 740a.
  • Data supplied from the primary video decoder 730a is reproduced on the primary video plane 740a.
  • the interactive graphics plane 74Od is
  • FIG. 9 is a schematic diagram for conceptual understanding of
  • pixels on the secondary video plane are processed to become
  • the keying-out can be
  • ⁇ luma-keying' is used to display a still image on
  • a primary video which is a main moving image such as a
  • the secondary video for example, a background part of the
  • the part of the primary video overlapped with the secondary video plane can be viewed through the
  • the secondary video may include video parts
  • video may have different luminance values, respectively.
  • secondary video may be included to the metadata for managing
  • FIG. 10 illustrates an exemplary embodiment of the secondary
  • PaP metadata referred to as "PiP metadata”.
  • the PiP metadata may be present in a playlist which is a kind of a reproduction management file.
  • FIG. 10 illustrates PiP
  • the PiP metadata may include at least one block of a
  • the block data 920 includes data information of the
  • the PiP metadata may be present in headers of secondary video streams implementing PiP.
  • the block header 910 may include a field representing
  • PlayItem_id[k] ' has a value corresponding to a playitem
  • the optical recording/reproducing apparatus 10 can be any optical recording/reproducing apparatus 10.
  • the playlist block includes a sub path block.
  • the PiP metadata may also include
  • the secondary video namely, ⁇ is__luma-key' , is set to ⁇ l b ' ,
  • the specified pixels exhibit full transparency. Meanwhile, each of the remaining pixels, which have luminance values
  • the secondary video namely, ⁇ is_luma-key' , is set to ⁇ 0 b ',
  • pixels to be transparency-processed' namely, ⁇ lower__limit_luma_key' .
  • luminance values not lower than the lower limit are processed to become transparent.
  • the block header 910 may also include information representing a timeline referred to by the associated PiP
  • ⁇ PiP timeline type metadata (hereinafter, referred to as ⁇ PiP timeline type
  • the block data 920 may include time stamp information indicating a point where PiP metadata is
  • ⁇ pip_metadata_time_stamp' positioned (hereinafter, referred to as ⁇ pip_metadata_time_stamp' ) .
  • the ⁇ pip_timeline__type [k] ' is
  • the block data 920 may also include at least one block of
  • the secondary video composition information is
  • information may include position information of the secondary
  • information of the secondary video includes horizontal position .
  • ⁇ pip_horizontal_position' represents a horizontal position of
  • ⁇ pip_vertical_position' represents a vertical position of the secondary video displayed on the screen when viewing from the
  • the secondary video plane is adjusted
  • composition information based on the composition information, and is then combined
  • the information may be recorded in a clip information file, as separate luma-
  • this information may be recorded
  • FIG. 11 is a flow chart illustrating an exemplary embodiment
  • controller 12 checks metadata for managing reproduction of the secondary video (SlO) . The controller 12 then determines
  • ⁇ is_luma_key' has been set to ⁇ l b ' , the pixels in the
  • 'lower__limit_luma_key' may be included in the metadata.
  • controller 12 will transparency-process the
  • ⁇ upper_limit__luma__key' may be included in the metadata.
  • controller 12 will transparency-processed the
  • the information as to ⁇ luma-keying' included in the metadata may not be applied
  • FIG. 12 is a schematic diagram for conceptually understanding
  • ⁇ flip' means interchange of the sizes of the primary and secondary videos.
  • the primary video flipped on the display 20 may be identical to or different from the position of the secondary video
  • the secondary video plane is moved to the position of the
  • flipping may be achieved by interchanging the front and back positions
  • the secondary video is
  • the primary video can be viewed
  • the pixels to be transparent may also be any pixels to be transparent.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

In one embodiment, management information for managing reproduction of at least a picture-in-picture presentation path is reproduced. The management information includes luma-keying information on a luma-keying function, and the luma-keying function manages transparency of a secondary video stream. The luma-keying information indicates whether the luma-keying function is applicable to the secondary video stream when the secondary video stream is not scaled to full size. The secondary video stream represents the picture-in-picture presentation path with respect to a primary presentation path represented by a primary video stream. The primary video stream and the secondary video stream are reproduced based on the management information.

Description

[DESCRIPTION]
RECORDING MEDIUM, METHOD AND APPARATUS FOR REPRODUCING DATA
AND METHOD AND APPARATUS FOR RECORDING DATA
Technical Field
The present invention relates to recording and reproducing
methods and apparatuses, and a recording medium.
Background Art
Optical discs are widely used as a recording medium capable
of recording a large amount of data therein. Particularly,
high-density optical recording mediums such as a Blu-ray Disc
(BD) and a high definition digital versatile disc (HD-DVD)
have recently been developed, and are capable of recording
and storing large amounts of high-quality video data and high-quality audio data.
Such a high-density optical recording medium, which is based
on next-generation recording medium techniques, is considered
to be a next-generation optical recording solution capable of
storing much more data than conventional DVDs. Development
of high-density optical recording mediums is being conducted,
together with other digital appliances. Also, an optical
recording/reproducing apparatus, to which the standard for
high density recording mediums is applied, is under development. In accordance with the development of high-density recording
mediums and optical recording/reproducing apparatuses, it is
possible to simultaneously reproduce a plurality of videos.
However, there is known no method capable of effectively
simultaneously recording or reproducing a plurality of videos.
Furthermore, it is difficult to develop a complete optical
recording/reproducing apparatus based on high-density recording mediums because there is no completely-established
standard for high-density recording mediums .
Disclosure of Invention
The present invention relates to a method of managing
reproduction of at least one picture-in-picture presentation path.
In one embodiment, management information for managing
reproduction of at least a picture-in-picture presentation
path is reproduced. The management information includes luma-
keying information on a luma-keying function, and the luma-
keying function manages transparency of a secondary video
stream. The luma-keying information indicates whether the
luma-keying function is applicable to the secondary video
stream when the secondary video stream is not scaled to full
size. The secondary video stream represents the picture-in-
picture presentation path with respect to a primary
presentation path represented by a primary video stream. The primary video stream and the secondary video stream are
reproduced based on the management information.
In one embodiment, the luma-keying information indicates a
luma-keying threshold value. The primary video stream and the
secondary video stream are reproduced such that pixels of the
secondary video stream having luminance values less than and
equal to the luma-keying threshold are displayed fully transparent if the luma-keying function is applicable to the
secondary video data.
In another embodiment, the primary video stream and the
secondary video stream step are reproduced such that pixels of the secondary video stream having luminance values greater
than and equal to the luma-keying threshold are displayed fully transparent if the luma-keying function is applicable
to the secondary video data.
In a further embodiment, the luma-keying information
indicates a luma-keying range. The primary video stream and
the secondary video stream are reproduced such that pixels of
the secondary video stream having luminance values falling
within the luma-keying range are displayed fully transparent
if the luma-keying function is applicable to the secondary
video data.
In one embodiment, the management information includes
composition information, and the composition information
includes position information indicating a position to display the secondary video stream.
In a further embodiment, the management information includes
composition information, and the composition information
includes scale information indicating a size to display the
secondary video stream.
The present invention also relates to apparatuses for
managing reproduction of at least one picture-in-picture
presentation path, to methods and apparatuses for recording a data structure for managing reproduction of at least one
picture-in-picture presentation path, and to a recording
medium having a data structure for managing reproduction of at least one picture-in-picture presentation path.
Brief Description of Drawings
The accompanying drawings, which are included to provide a
further understanding of the invention and are incorporated
in and constitute a part of this application, illustrate
embodiment (s) of the invention and together with the
description serve to explain the principles of the invention.
In the drawings:
FIG. 1 is a schematic view illustrating an exemplary
embodiment of the combined use of an optical
recording/reproducing apparatus according to an embodiment of
the present invention and a peripheral appliance; FIG. 2 is a schematic diagram illustrating a structure of
files recorded in an optical disc as a recording medium
according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a data recording
structure of the optical disc as the recording medium
according to an embodiment of the present invention;
FIG. 4 is a schematic diagram for understanding a concept of
a secondary video according to an embodiment of the present invention;
FIG. 5 is a block diagram illustrating an overall
configuration of an optical recording/reproducing apparatus
according to an embodiment of the present invention;
FIG. 6 is a block diagram schematically illustrating an
exemplary embodiment of a playback system according to an embodiment of the present invention;
FIGs. 7A and 7B are schematic diagrams illustrating an AV
decoder model according to an embodiment of the present invention;
FIGs. 8A to 8C are schematic diagrams illustrating secondary
video sub path types according to an embodiment of the
present invention, respectively;
FIG. 9 is a schematic diagram for conceptual understanding of
Λluma-keying' according to an embodiment of the present invention;
FIG. 10 is a schematic diagram illustrating an exemplary embodiment of secondary video metadata according to the
present invention;
FIG. 11 is a flow chart illustrating an exemplary embodiment
of a data reproducing method according to the present
invention; and
FIG. 12 is a schematic diagram for conceptually understanding
flip of the primary and secondary videos carried out using
Λluma-keying' in accordance with the present invention.
Best Mode for Carrying Out the Invention
Reference will now be made in detail to example embodiments
of the present invention, which are illustrated in the
accompanying drawings. Wherever possible, the same reference
numbers will be used throughout the drawings to refer to the
same or like parts.
In the following description, example embodiments of the
present invention will be described in conjunction with an
optical disc as an example recording medium. In particular,
a Blu-ray disc (BD) is used as an example recording medium,
for the convenience of description. However, it will be
appreciated that the technical idea of the present invention
is applicable to other recording mediums, for example, HD-DVD,
equivalently to the BD.
"Storage" as generally used in the embodiments is a storage
equipped in a optical recording/reproducing apparatus (FIG. 1) . The storage is an element in which the user freely
stores required information and data, to subsequently use the
information and data. For storages, which are generally used,
there are a hard disk, a system memory, a flash memory, and
the like. However, the present invention is not limited to
such storages.
In association with the present invention, the "storage" is
also usable as means for storing data associated with a
recording medium (for example, a BD) . Generally, the data stored in the storage in association with the recording
medium is externally-downloaded data.
As for such data, it will be appreciated that partially-
allowed data directly read out from the recording medium, or system data produced in association with recording and
production of the recording medium (for example, metadata)
can be stored in the storage.
For the convenience of description, in the following
description, the data recorded in the recording medium will
be referred to as "original data", whereas the data stored in
the storage in association with the recording medium will be
referred to as "additional data".
Also, "title" used in the present invention means a
reproduction unit interfaced with the user. Titles are
linked with particular objects, respectively. Accordingly,
streams recorded in a disc in association with a title are reproduced in accordance with a command or program in an
object linked with the title. In particular, for the
convenience of description, among the titles recorded in a disc, titles including high-quality video information
according to an MPEG-2 compression scheme will be considered.
In particular, titles supporting continuous multi-angle,
multi-story, credit, director cut, or the like, will be
referred to as "High Definition Movie (HDMV) titles", for the convenience of description. In addition to titles including
high-quality video information according to an MPEG
compression scheme, titles including Java program information
supporting update of titles in a disc and connectability
thereof to a network, and thus, providing high interactivity,
will be referred to as "BD-J titles".
FIG. 1 illustrates an exemplary embodiment of the combined use of an optical recording/reproducing apparatus according
to the present invention and a peripheral appliance.
The optical recording/reproducing apparatus 10 according to
an embodiment of the present invention can record or
reproduce data in/from various optical discs having different
formats. If necessary, the optical recording/reproducing
apparatus 10 may be designed to have recording and
reproducing functions only for optical discs of a particular
format (for example, BD) , or to have a reproducing function
alone, except for a recording function. In the following description, however, the optical recording/reproducing apparatus 10 will be described in conjunction with, for
example, a BD-player for playback of a BD, or a BD-recorder
for recording and playback of a BD, taking into
consideration the compatibility of BDs with peripheral
appliances, which must be solved in the present invention.
It will be appreciated that the optical recording/reproducing
apparatus 10 of the present invention may be a drive which can be built in a computer or the like.
The optical recording/reproducing apparatus 10 of the present
invention not only has a function for recording and playback
of an optical disc 30, but also has a function for receiving
an external input signal, processing the received signal, and
sending the processed signal to the user in the form of a
visible image through an external display 20. Although there
is no particular limitation on external input signals,
representative external input signals may be digital
multimedia broadcasting-based signals, Internet-based signals,
etc. Specifically, as to Internet-based signals, desired
data on the Internet can be used after being downloaded
through the optical recording/reproducing apparatus 10
because the Internet is a medium easily accessible by any person.
In the following description, persons who provide contents as
external sources will be collectively referred to as a "content provider (CP)".
"Content" as used in the present invention may be the content
of a title, and in this case means data provided by the
author of the associated recording medium.
Hereinafter, original data and additional data will be
described in detail. For example, a multiplexed AV stream o'f
a certain title may be recorded in an optical disc as original data of the optical disc. In this case, an audio stream (for example, Korean audio stream) different from the
audio stream of the original data (for example, English) may
be provided as additional data via the Internet. Some users
may desire to download the audio stream (for example, Korean
audio stream) corresponding to the additional data from the
Internet, to reproduce the downloaded audio stream along with
the AV stream corresponding to the original data, or to
reproduce the additional data alone. To this end, it is
desirable to provide a systematic method capable of
determining the relation between the original data and the
additional data, and performing management/reproduction of
the original data and additional data, based on the results
of the determination, at the request of the user.
As described above, for the convenience of description,
signals recorded in a disc have been referred to as "original
data", and signals present outside the disc have been
referred to as "additional data". However, the definition of the original data and additional data is only to classify
data usable in the present invention in accordance with data
acquisition methods. Accordingly, the original data and
additional data should not be limited to particular data.
Data of any attribute may be used as additional data as long
as the data is present outside an optical disc recorded with
original data, and has a relation with the original data.
In order to accomplish the request of the user, the original
data and additional data must have file structures having a relation therebetween, respectively. Hereinafter, file
structures and data recording structures usable in a BD will be described with reference to FIGs. 2 and 3.
FIG. 2 illustrates a file structure for reproduction and management of original data recorded in a BD in accordance
with an embodiment of the present invention.
The file structure of the present invention includes a root
directory, and at least one BDMV directory BDMV present under
the root directory. In the BDMV directory BDMV, there are an
index file "index. bdmv" and an object file "MovieObject .bdmv"
as general files (upper files) having information for
securing an interactivity with the user. The file structure
of the present invention also includes directories having
information as to the data actually recorded in the disc, and
information as to a method for reproducing the recorded data,
namely, a playlist directory PLAYLIST, a clip information directory CLIPINF, a stream directory STREAM, an auxiliary-
directory AUXDATA,. a BD-J directory BDJO, a metadata
directory META, a backup directory BACKUP, and a JAR
directory. Hereinafter, the above-described directories and
files included in the directories will be described in detail.
The JAR directory includes JAVA program files.
The metadata directory META includes a file of data about
data, namely, a metadata file. Such a metadata file may include a search file and a metadata file for a disc library.
Such metadata files are used for efficient search and
management of data during the recording and reproduction of
data .
The BD-J directory BDJO includes a BD-J object file for
reproduction of a BD-J title.
The auxiliary directory AUXDATA includes- an additional data
file for playback of the disc. For example, the auxiliary
directory AUXDATA may include a "Sound. bdmv" file for
providing sound data when an interactive graphics function is
executed, and λλlllll . otf" and " 99999. otf" files for providing
font information during the playback of the disc.
The stream directory STREAM includes a plurality of files of
AV streams recorded in the disc according to a particular
format. Most generally, such streams are recorded in the
form of MPEG-2-based transport packets. The stream directory
STREAM uses "*.m2ts" as an extension name of stream files (for example, 01000.m2ts, 02000. m2ts, ...) . Particularly, a
multiplexed stream of video/audio/graphic information is referred to as an "AV stream". A title is composed of at
least one AV stream file.
The clip information (clip-info) directory CLIPINF includes
clip-info files 01000. clpi, 02000. clpi, ... respectively
corresponding to the stream files "*.m2ts" included in the stream directory STREAM. Particularly, the clip-info files
"*.clpi" are recorded with attribute information and timing
information of the stream files "*.m2ts". Each clip-info
file "*.clpi" and the stream file "*.irι2ts" corresponding to the clip-info file "*.clpi" are collectively referred to as a
"clip". That is, a clip is indicative of data including both one stream file "*.m2ts" and one clip-info file "*.clpi"
corresponding to the stream file "*.m2ts".
The playlist directory PLAYLIST includes a plurality of
playlist files "*.mpls". "Playlist" means a combination of playing intervals of clips. Each playing interval is
referred to as a "playitem" . Each playlist file "*.mpls"
includes at least one playitem, and may include at least one
subplayitem. Each of the playitems and subplayitems includes
information as to the reproduction start time IN-Time and
reproduction end time OUT-Time of a particular clip to be
reproduced. Accordingly, a playlist may be a combination of
playitems. As to the playlist files, a process for reproducing data
using at least one playitem in a playlist file is defined as
a "main path", and a process for reproducing data using one
subplayitem is defined as a "sub path". The main path
provides master presentation of the associated playlist, and the sub path provides auxiliary presentation associated with
the master presentation. Each playlist file should include one main path. Each playlist file also includes at least one
sub path, the number of which is determined depending on the
presence or absence of subplayitems . Thus, each playlist
file is a basic reproduction/management file unit in the overall reproduction/management file structure for
reproduction of a desired clip or clips based on a combination of one or more playitems .
In association with the present invention, video data, which
is reproduced through a main path, is referred to as a
primary video, whereas video data, which is reproduced
through a sub path, is referred to as a secondary video. The
function of the optical recording/reproducing apparatus for
simultaneously reproducing primary and secondary videos is
also referred to as a "picture-in-picture (PiP) function".
The backup directory BACKUP stores a copy of the files in the
above-described file structure, in particular, copies of
files recorded with information associated with playback of
the disc, for example, a copy of the index file "index. bdmv", object files "MovieObject .bdmv" and "BD-JObject .bdmv", unit
key files, all playlist files λX*.mpls" in the playlist
directory PLAYLIST, and all clip-info files "*.clpi" in the
clip-info directory CLIPINF. The backup directory BACKUP is
adapted to separately store a copy of files for backup purposes, taking into consideration the fact that, when any
of the above-described files is damaged or lost, fatal errors may be generated in association with playback of the disc.
Meanwhile, it will be appreciated that the file structure of the present invention is not limited to the above-described
names and locations. That is, the above-described directories and files should not be understood through the
names and locations thereof, but should be understood through the meaning thereof.
FIG. 3 illustrates a data recording structure of the optical disc according to an embodiment of the present invention. In
FIG. 3, recorded structures of information associated with
the file structures in the disc are illustrated. Referring
to FIG. 3, it can be seen that the disc includes a file
system information area recorded with system information for
managing the overall file, an area recorded with the index
file, object file, playlist files, clip-info files, and meta
files (which are required for reproduction of recorded
streams "*.m2ts"), a stream area recorded with streams each
composed of audio/video/graphic data or STREAM files, and a JAR area recorded with JAVA program files. The areas are
arranged in the above-descried order when viewing from the
inner periphery of the disc.
In accordance with the present invention, stream data of a
primary video and/or a secondary video is stored in the
stream area. In the present invention, the secondary video
may be multiplexed in the same stream as the primary video, or may be multiplexed in a stream different from that of the
primary video. In the disc, there is an area for recording file information
for reproduction of contents in the stream area. This area is referred to as a "management area". The file system
information area and database area are included in the management area. In accordance with the present invention, a
sub path is used to reproduce the secondary video. The type of the sub path used to reproduce the secondary video may be
classified into three types in accordance with the kind of a
stream in which the secondary video is multiplexed, and
whether or not the sub path is synchronous with a main path.
The three sub path types will be described with reference to
FIGs. 8A to 8C. Since the method for reproducing the
secondary video is varied depending on the sub path type, the
management area includes information representing the sub
path type.
The areas of FIG. 3 are shown and described only for illustrative purposes. It will be appreciated that the
present invention is not limited to the area arrangement of
FIG. 3.
FIG. 4 is a schematic diagram for understanding of the
concept of the secondary video according to the present invention.
The present invention has an object to provide a method for
reproducing secondary video data, simultaneously with primary video data. That is, the present invention implements an
optical recording/reproducing apparatus which enables a PiP
application, and, in particular, effectively performs the PiP application.
During reproduction of a primary video as shown in FIG. 4,
other video associated with the primary video may be
displayed through the same display 20 as that of the primary
video. In accordance with the present invention, such a PiP
function can be achieved. For example, during reproduction
of a movie or documentary, it is possible to provide, to the
user, the comments of the director or episode associated with
the shooting procedure. In this case, the video of the
comments or episode is a secondary video. The secondary
video can be reproduced on the primary video.
The secondary video can be reproduced simultaneously with the
primary video, from the beginning of the reproduction of the
primary video. The reproduction of the secondary video may also be begun at an intermediate time of the reproduction of
the primary video. It is also possible to display the
secondary video while varying the position or size of the
secondary video on the screen, depending on the reproduction
procedure. Also, when, for example, the secondary video is
not scaled to full size, it is possible to selectively
control the transparency of the secondary video. A plurality
of secondary videos may also be implemented. In this case,
the secondary videos may be reproduced, separately from one another, during the reproduction of the primary video. The
primary video can be reproduced along with an audio associated with the primary video. Similarly, the secondary
video can be reproduced along with an audio associated with
the secondary video.
FIG. 5 illustrates an exemplary embodiment of the overall
configuration of the optical recording/reproducing apparatus
10 according to the present invention.
As shown in FIG. 5, the optical recording/reproducing
apparatus 10 mainly includes a pickup 11, a servo 14, a
signal processor 13, and a microprocessor 16. The pickup 11
reproduces original data and management data recorded in an
optical disc. The management data includes reproduction
management file information. The servo 14 controls operation
of the pickup 11. The signal processor 13 receives a
reproduced signal from the pickup 11, and restores the received reproduced signal to a desired signal value. The
signal processor 13 also modulates signals to be recorded,
for example, primary and secondary videos, to signals
recordable in the optical disc, respectively. The
microprocessor 16 controls the operations of the pickup 11,
the servo 14, and the signal processor 13. The pickup 11,
the servo 14, the signal processor 13, and the microprocessor
16 are also collectively referred to as a
"recording/reproducing unit". In accordance with the present invention, the recording/reproducing unit reads data from an
optical disc 30 or storage 15 under the control of a
controller 12, and sends the read data to an AV decoder 17b.
That is, in a viewpoint of reproduction, the
recording/reproducing unit functions as a reader unit for
reading data. The recording/reproducing unit also receives an
encoded signal from an AV encoder 18, and records the
received signal in the optical disc 30. Thus, the
recording/reproducing unit can record video and audio data in
the optical disc 30.
The controller 12 downloads additional data present outside
the optical disc 30 in accordance with a user command, and
stores the additional data in the storage 15. The controller
12 also reproduces the additional data stored in the storage
15 and/or the original data in the optical disc 30 at the
request of the user. In accordance with the present invention, the controller 12 produces metadata for managing reproduction of the secondary video, and performs a control
operation for recording the metadata in the optical disc 30,
along with video data.
In this connection, in accordance with the present invention the metadata may include information as to whether or not
luma-keying should be applied to the secondary video. The
metadata also include information for specifying pixels to be
transparency-processed. This will be described in detail with reference to FIG. 9.
The optical recording/reproducing apparatus 10 further
includes a playback system 17 for finally decoding data, and
providing the decoded data to the user under the control of the controller 12. The playback system 17 includes an AV
decoder 17b for decoding an AV signal. The playback system
17 also includes a player model 17a for analyzing an object command or application associated with playback of a
particular title, for analyzing a user command input via the
controller 12, and for determining a playback direction,
based on the results of the analysis. In an embodiment, the
player model 17a may be implemented as including the AV
decoder 17a. In this case, the playback system 17 is the
player model itself. The AV decoder 17b may include a
plurality of decoders respectively associated with different
kinds of signals. The AV encoder 18, which is also included in the optical
recording/reproducing apparatus 10 of the present invention,
converts an input signal to a signal of a particular format,
for example, an MPEG2 transport stream, and sends the
converted signal to the signal processor 13, to enable
recording of the input signal in the optical disc 30.
FIG. 6 is a schematic diagram explaining the playback system
according to an embodiment of the present invention. In accordance with the present invention, the playback system
can simultaneously reproduce the primary and secondary videos.
"Playback system" means a collective reproduction processing
means which is configured by programs (software) and/or
hardware provided in the optical recording/reproducing apparatus. That is, the playback system is a system which
can not only play back a recording medium loaded in the
optical recording/reproducing apparatus, but also can
reproduce and manage data stored in the storage of the apparatus in association with the recording medium (for
example, after being downloaded from the outside of the
recording medium) .
In particular, as shown in Fig. 6, the playback system 17 may
include a user event manager 171, a module manager 172, a
metadata manager 173, an HDMV module 174, a BD-J module 175,
a playback control engine 176, a presentation engine 177, and
a virtual file system 40. This configuration will be described in detail, hereinafter.
As a separate reproduction processing/managing means for
reproduction of HDMV titles and BD-J titles, the HDMV module
174 for HDMV titles and the BD-J module 175 for BD-J titles
are constructed independently of each other. Each of the
HDMV module 174 and BD-J module 175 has a control function
for receiving a command or program contained in the
associated object "Movie Object" or "BD-J Object", and processing the received command or program. Each of the HDMV
module 174 and BD-J module 175 can separate an associated
command or application from the hardware configuration of the playback system, to enable portability of the command or
application. For reception and processing of the command,
the HDMV module 174 includes a command processor 174a. For
reception and processing of the application, the BD-J module
175 includes a Java Virtual Machine (VM) 175a, and an
application manager 175b.
The Java VM 175a is a virtual machine in which an application
is executed. The application manager 175b includes an
application management function for managing the life cycle
of an application processed in the BD-J module 175.
The module manager 172 functions not only to send user
commands to the HDMV module 174 and BD-J module 175,
respectively, but also to control operations of the HDMV
module 174 and BD-J module 175. A playback control engine 176 analyzes the playlist file actually recorded in the disc
in accordance with a playback command from the HDMV module
174 or BD-J module 175, and performs a playback function
based on the results of the analysis. The presentation
engine 177 decodes a particular stream managed in association
with reproduction thereof by the playback control engine 176,
and displays the decoded stream in a displayed picture. In
particular, the playback control engine 176 includes playback
control functions 176a for managing all playback operations, and player registers 176b for storing information as to the
playback status and playback environment of the player
(information of player status registers (PSRs) and general
purpose registers (GPRs)). In some cases, the playback
control functions 176a mean the playback control engine 176
itself.
The HDMV module 174 and BD-J module 175 receive user commands
in independent manners, respectively. The user command
processing methods of HDMV module 174 and BD-J module 175 are
also independent of each other. In order to transfer a user
command to an associated one of the HDMV module 174 and BD-J
module 175, a separate transfer means should be used. In
accordance with the present invention, this function is
carried out by the user event manager 171. Accordingly, when
the user event manager 171 receives a user command generated
through a user operation (UO) controller 171a, the user event manager sends the received user command to the module manager
172 or UO controller 171a. On the other hand, when the user
event manager 171 receives a user command generated through a
key event, the user event manager sends the received user
command to the Java VM 175a in the BD-J module 175.
The playback system 17 of the present invention may also
include a metadata manager 173. The metadata manager 173
provides, to the user, a disc library and an enhanced search
metadata application. The metadata manager 173 can perform selection of a title under the control of the user. The
metadata manager 173 can also provide, to the user, recording
medium and title metadata.
The module manager 172, HDMV module 174, BD-J module 175, and
playback control engine 176 of the playback system according
to the present invention can perform desired processing in a
software manner. Practically, the processing using software
is advantageous in terms of design, as compared to processing
using a hardware configuration. Of course, it is general
that the presentation engine 177, decoder 17b, and planes are
designed using hardware. In particular, the constituent
elements (for example, constituent elements designated by
reference numerals 172, 174, 175, and 176), each of which
performs desired processing using software, may constitute a
part of the controller 12. Therefore, it should be noted
that the above-described constituents and configuration of the present invention be understood on the basis of their
meanings, and are not limited to their implementation methods
such as hardware or software implementation. Here, "plane"
means a conceptual model for explaining overlaying procedures
of the primary video, secondary video, PG (presentation
graphics), IG (interactive graphics), text sub titles. In
accordance with the present invention, the secondary video
plane is arranged in front of the primary video plane.
Accordingly, the secondary video' output after being decoded is presented on the secondary video plane.
FIGs. 7A and 7B schematically illustrate an AV decoder model according to the present invention.
Referring to FIG. 7A, the AV decoder 17b according to the
present invention includes a secondary video decoder 730b for
simultaneous reproduction of the primary and secondary videos,
namely, implementation of a PiP application. The secondary
video decoder 730b decodes the secondary video. The secondary video may be recorded in the recording medium 30 in
a state of being contained in an AV stream, to be supplied to
the user. The secondary video may also be supplied to the
user after being downloaded from the outside of the recording
medium 30. The AV stream is supplied to the AV decoder 17b
in the form of a transport stream (TS) .
In the present invention, the AV stream, which is reproduced
through a main path, is referred to as a main transport stream or main TS (hereinafter, also referred to as a "main
stream") , and an AV stream other than the main stream is
referred to as a sub transport stream or sub TS (hereinafter,
also referred to as a "sub stream") .
In the AV decoder 17b, a main stream from the optical disc 30
passes through a switching element to a buffer RBl, and the
buffered main stream is depacketized by a source depacketizer
710a. Data contained in the depacketized AV stream is supplied to an associated one of decoders 730a to 73Og after
being separated from the depacketized AV stream in a PID
(packet identifier) filter-1 720a in accordance with the kind of the data packet. That is, in case that a secondary video
is contained in the main stream, the secondary video is separated from other data packets in the main stream by the
PID filter-1 720a, and is then supplied to the secondary video decoder 730b. As shown, the packets from the PID
filter-1 720a may pass through another switching element
before receipt by the decoders 730b-730g.
On the other hand, each sub stream from the optical disc 30
or local storage 15 passes through a switching element to a
buffer RB2, the buffered sub stream is depacketized by a
source depacketizer 710b. Data contained in the depacketized
AV stream is supplied to an associated one of the decoders
730a to 73Og after being separated from the depacketized AV
stream in a PID filter-2 720b in accordance with the kind of the data packet. As shown, the packets from the PID filter-2
720b may pass through another switching element before
receipt by the decoders 730b-730f.
That is, the primary video is decoded in a primary video
decoder 730a, and the primary audio is decoded in a primary
audio decoder 73Oe. Also, the PG (presentation graphics), IG
(interactive graphics), secondary audio, text subtitle are
decoded in a PG decoder 730c, an IG decoder 73Od, a secondary
audio decoder 73Of, and a text decoder 73Og, respectively.
FIGs. 8A to 8C illustrate secondary video sub path types according to the present invention.
PiP application models according to the present invention are
mainly classified into three types, based on the kind of a
stream, in which the secondary video is multiplexed, and
whether or not the sub path used to reproduce the secondary
video is synchronous with a main path associated with the sub
path. Accordingly, in the present invention, the kind of the
sub path used to reproduce the secondary video, namely, the
sub path type, is determined, taking into consideration the
above-described three models.
In a sub path type shown in FIG. 8A, the secondary video is
encoded in a stream different from that of the primary video,
and the sub path is synchronous with the main path. The case
in which the secondary video is multiplexed in a stream
different from that of the primary video, as described above, is referred to as an Λout-of-mux' type.
Referring to FIG. 8A, the playlist for managing the primary
and secondary videos includes one main path used to reproduce
the primary video, and one sub path used to reproduce the
secondary video. The main path is constituted by four
playitems ( λPlayItem_id' = 0, 1, 2, 3), whereas the sub path
is constituted by a plurality of subplayitems . The sub path
is synchronous with the main path. In detail, the secondary
video is synchronized with the main path, using an information field Λsync-Playltem__id' , which identifies a
playitem associated with each subplayitem, namely,
information, and presentation time stamp information
Λsync_start_PTS_of_PlayItem' , which represents a presentation
time of the subplayitem in the playitem. That is, when the
presentation point of the playitem reaches a value referred
to by the presentation time stamp information, the
presentation of the associated subplayitem is begun. Thus,
reproduction of the secondary video through one sub path is
begun at a predetermined time during the reproduction of the
primary video through the main path.
In this case, the playitem and subplayitem refer to different
clips, respectively, because the secondary video is
multiplexed in a stream different from that of the primary
video. Each of the playitems and subplayitems includes
information as to the reproduction start time IN-Time and reproduction end time OUT-Time of a particular clip to be
reproduced. Accordingly, the clip referred to by the
associated playitem and subplayitem is supplied to the AV decoder 17b.
Referring to FIG. 7A, the secondary video, which is
reproduced through the sub path corresponding to the sub path
type of FIG. 8A, is supplied to the AV decoder 17b as a sub stream (Sub TS) , whereas the primary video is supplied to the
AV decoder 17b as a main stream (Main TS) . In the AV decoder
17b, the main stream is depacketized by the source
depacketizer 710a, and is then sent to the PID filter-1 720a. On the other hand, the sub stream is depacketized by the
source depacketizer 710b, and is then sent to the PID filter- 2 720b. Data contained in the depacketized sub stream or
main stream is separated from the associated depacketized
stream in the associated PID filter-1 720a or PID filter-2
720b in accordance with the kind of the data packet thereof,
and is sent to an associated one of decoders 730a to 73Og, so
as to be decoded. That is, the primary video is decoded in a
primary video decoder 730a, and the primary audio is decoded
in a primary audio decoder 73Oe. Also, the PG, IG, secondary
audio, text subtitle are decoded in a PG decoder 730c, an IG
decoder 73Od, a secondary audio decoder 73Of, and a text decoder 73Og, respectively.
The decoded primary video, secondary video, PG, and IG are reproduced by a primary video plane 740a, a secondary video
plane 740b, a presentation graphics plane 740c, and an
interactive graphics plane 74Od, respectively. The
presentation graphics plane 740c can also reproduce graphic
data decoded in the text decoder 73Og. The decoded primary
and secondary audios are output after being mixed in an audio
mixer. Since the sub path used to reproduce the secondary video is synchronous with the main path used to reproduce the
primary video in the sub path type of FIG. 8A, the controller
12 performs a control operation for outputting the secondary video in synchronization with the primary video.
In a sub path type shown in FIG. 8B, the secondary video is
encoded in a stream different from that of the primary video,
and the sub path is asynchronous with the main path. Similar
to the sub path type of FIG. 8A, secondary video streams,
which will be reproduced through sub paths, are multiplexed
in a state of being separated from a clip to be reproduced based on the associated playitem. However, the sub path type
of FIG. 8B is different from the sub path type of FIG. 8A in
that the presentation of the sub path can be begun at any
time on the timeline of the main path.
Referring to FIG. 8B, the playlist for managing the primary
and secondary videos includes one main path used to reproduce
the primary video, and one sub path used to reproduce the
secondary video. The main path is constituted by three playitems ( ΛPlayItem_id' = 0, 1, 2), whereas the sub path is
constituted by one subplayitem. The secondary video, which
is reproduced through the sub path, is asynchronous with the
main path. That is, even when the subplayitem includes
information for identifying a playitem associated with the
subplayitem and presentation time stamp information
representing a presentation time of the subplayitem in the
playitem, these information are ineffective in the sub path
type of FIG. 8B. Accordingly, the optical recording/reproducing apparatus 10 can operate irrespective
of the above-described information used to synchronize the
main path and sub path. Thus, the user can view the
secondary video at any time during the reproduction of the
primary video.
In a sub path type shown in FIG. 8C, the secondary video is
encoded in the same stream as the primary video, and the sub
path is synchronous with the main path. The case in which the secondary video is multiplexed in a stream different from
that of the primary video, as described above, is referred to
as an λout-of-mux' type. The sub path type of FIG. 8C is
different from those of FIGs. 8A and 8B in that the secondary
video is multiplexed in the same AV stream as the primary
video. The case in which the secondary video is multiplexed
in the same stream as the primary video, as described above,
is referred to as an Λin-mux' type. Referring to FIG. 8C, the playlist for managing the primary
and secondary videos includes one main path and one sub path.
The main path is constituted by four playitems ( ΛPlayItem_id'
= 0, 1, 2, 3), whereas the sub path is constituted by a
plurality of subplayitems . Each of the subplayitems
constituting the sub path includes information for
identifying a playitem associated with the subplayitem and presentation time stamp information representing a
presentation time of the subplayitem in the playitem. As
described above with reference to FIG. 8A, each subplayitem
is synchronized with the associated playitem, using the above-described information. Thus, the secondary video is
synchronized with the primary video. In the sub path type of FIG. 8C, each of the playitems
constituting the main path and an associated one or ones of the subplayitems constituting the sub path refer to the same
clip. Accordingly, the secondary video is supplied to the AV
decoder 17b, along with the primary video, as a main stream.
As shown in FIG. 7A, the main stream, which is packetized
data including the primary and secondary videos, is
depacketized by the source depacketizer 710a, and is then
sent to the PID filter-1 720a. Data packets are separated
from the depacketized data in the PID filter-1 720a in
accordance with associated PIDs, respectively, and are then
sent to associated ones of the decoders 730a to 73Og, so as to be decoded. That is, the primary video is output from the
primary video decoder 730a after being decoded in the primary
video decoder 730a. The secondary video is output from the
secondary video decoder 730b after being decoded in the
secondary video decoder 730b. In this case, the controller 12 performs a control operation for displaying the secondary
video in synchronism with the primary video.
The main stream and sub stream may be supplied from the
recording medium 30 or storage 15 to the AV decoder 17b. Where the primary and secondary videos are stored in
different clips, respectively, the primary video may be
recorded in the recording medium 30, to be supplied to the
user, and the secondary video may be downloaded from the
outside of the recording medium 30 to the storage 15. Of
course, the case opposite to the above-described case may be
possible. However, where both the primary and secondary
videos are stored in the recording medium 30, one of the
primary and secondary videos should be copied to the storage
15, prior to the reproduction thereof, in order to enable the
primary and secondary videos to be simultaneously reproduced.
Where both the primary and secondary videos are stored in the
same clip, they are supplied after being recorded in the
recording medium 30. In this case, however, both the primary
and secondary videos are downloaded from the outside of the
recording medium 30. Here, "plane" means a conceptual model for explaining
overlaying procedures of the primary video, secondary video,
PG, IG, and text subtitles. In accordance with the present
invention, the plane model enables the primary video,
secondary video, PG, IG, and text subtitles to be independently controlled. In accordance with the present
invention, data supplied from the primary video decoder 730a is reproduced on the primary video plane 740a. Data supplied
from the secondary video decoder 730b is reproduced on the
secondary video plane 740b. Referring to FIG. 7B, the
secondary video plane 740b according to the present invention
is superimposed on the primary video plane 740a. The
secondary video plane 740a is adjusted in accordance with
size and position information included in the metadata for
managing reproduction of the secondary video such that the secondary video plane 740b is combined with the primary video
plane 740a on the display 20 in the form of a single image.
The presentation graphics plane 740c described above with
reference to FIG. 7A is superimposed on the secondary video
plane 740b. The interactive graphics plane 74Od is
superimposed on the presentation graphics plane 740c. The
presentation graphics plane 740c and interactive graphics
plane 74Od are combined together on the display 20 in the
form of a single image, so that they are supplied to the user
through the display 20. FIG. 9 is a schematic diagram for conceptual understanding of
Λluma-keying' according to an embodiment of the present invention.
As a method for diversely implementing contents, the present
invention provides a reproduction method in which particular
pixels on the secondary video plane are processed to become
transparent, namely, λkeyed out' . The keying-out can be
implemented by applying Λluma-keying' to the secondary video. Originally, Λluma-keying' is used to display a still image on
a video in an overlapped state, like as the title of a moving
picture which is displayed on the moving picture in the form of a still image during the display of the moving picture.
In the present invention, the above-described xluma-keying'
is intended to be applied to the secondary video reproduced simultaneously with the primary video.
Referring to FIG. 9, when a secondary video plane is
superimposed on a primary video plane, the part of a primary
video overlapped with the secondary video plane cannot be
viewed by the user (910) . For example, during reproduction
of a primary video which is a main moving image such as a
movie or documentary, the comments of the director or episode
associated with the shooting procedure may be displayed on
the primary video plane, as a secondary video. In this case,
the part of the primary video overlapped with the secondary
video plane, to which the secondary video is output, is hidden by the secondary video plane (910) . When a part of
the secondary video, for example, a background part of the
secondary video, is processed to become transparent by an
application of λluma-keying' thereto in accordance with the
present invention, the part of the primary video overlapped with the secondary video plane can be viewed through the
transparent part of the secondary video (920). Hereinafter, the ^luma-keying' application method will be described in
detail with reference to FIG. 9.
For example, the secondary video may include video parts
respectively corresponding to a director 910a who explains the primary video, and a background 910b surrounding the
director 910a. Also, the pixels constituting the secondary
video may have different luminance values, respectively.
When the director 910a is a main subject to be presented in the secondary video, there may be a need to process the
background 910b such that the background 910b becomes
transparent, in order to enable the primary video to be
viewed through the transparent background 910b. In this case,
since the pixels forming one picture may have different
luminance values, respectively, a reference luminance for
distinguishing the director 910a and background 910b from
each other is set. The pixels having luminance values higher
than or lower than the reference luminance value are
processed to become transparent. For example, when the luminance of the pixels ranges from λ0' to Λ255' , and the
most bright one of the pixels constituting the background
910b has a luminance value of Λ15' , the reference luminance
may be set to the luminance value of Λ15' , and the pixels
having luminance values ranging from Λ0' to λ15' may then be
processed to become transparent. In this case, the pixels
constituting the background 910b become transparent. As a
result, the primary video is viewed through the transparent
background 920b. At this time, the director 910a is output
under the condition in which the original transparency values
of the pixels of the director 910a are maintained. Information as to application of Λluma-keying' to the
secondary video may be included to the metadata for managing
reproduction of the secondary video, so as to be provided to
the user. Hereinafter, this will be described with reference
to FIG. 10.
FIG. 10 illustrates an exemplary embodiment of the secondary
video metadata according to the present invention.
In accordance with the present invention, reproduction of the
secondary video is managed using metadata. The metadata
includes information about the reproduction time,
reproduction size, and reproduction position of the secondary
video. In the following description, the metadata will be
referred to as "PiP metadata".
The PiP metadata may be present in a playlist which is a kind of a reproduction management file. FIG. 10 illustrates PiP
metadata blocks present in an ΛExtensionData' block of a
playlist ΛPlayList' managing reproduction of the primary
video. The PiP metadata may include at least one block of a
block header Λblock_header [k] ' 910, the number of which is
determined depending on the number of metadata block entries
stored in PiP metadata blocks, and at least one block of
block data λblock_data [k] ' 920. The block header 910
includes header information of the associated metadata block. The block data 920 includes data information of the
associated metadata block. Although the PiP metadata has
been described in the embodiment of FIG. 10, as being present
in the playlist, the PiP metadata may be present in headers of secondary video streams implementing PiP.
The block header 910 may include a field representing
playitem identifying information (hereinafter, referred to as
ΛPlayItem_id [k] ' ) , and a field representing secondary video
stream identifying information (hereinafter, referred to as
Λsecondary_video_stream_id [k] ' ) . The information
λPlayItem_id[k] ' has a value corresponding to a playitem
including an STN table in which Λsecondary_video_stream_id'
entries referred to by Λsecondary_video_stream_id [k] ' are
listed. The value of ΛPlayItem_id [k] ' is stored in the
playlist block of the playlist file. Preferably, in the PiP
metadata, the entries of "Playitem id' are sorted in an ascending order with respect to λPlayItem_id' recorded in the
PiP metadata. The information Λsecondary_video_stream_id [k] '
is used to identify a sub path, and a secondary video stream
to which the associated block data 920 is applied. That is,
it is possible to identify the stream entry corresponding to
λsecondary_video_stream_id [k] ' , in the STN table of
ΛPlayItem' corresponding to λPlayItem__id [k] ' . Since the
stream entry is recorded with the value of the sub path
identification information associated with the secondary
video, the optical recording/reproducing apparatus 10 can
identify the sub path, which is used to reproduce the
secondary video, based on the recorded value. The playlist block includes a sub path block.
In accordance with the present invention, the PiP metadata
may include information as to application of λkeying-out' to
the secondary video. The PiP metadata may also include
information for specifying pixels to be transparency-
processed, namely, to become transparent, in the secondary
video. Referring to FIG. 10, when the information
representing whether or not λkeying-out' has been applied to
the secondary video, namely, Λis__luma-key' , is set to Λlb' ,
the information for specifying pixels to be transparency-
processed in the secondary video, namely,
λupper_limit_luma__key' , specifies an upper limit of the
luminance of the secondary video. For example, when the secondary video is not scaled to full size, the "is_luma_key"
indicates whether transparency processing (i.e., the luma-
keying function) is applicable to the secondary video. In
this case, when the primary video plane 740a and secondary
video plane 740b are overlapped with each other, the pixels
on the secondary plane 740b, which have luminance values
ranging from 1O' to '*upper_limit_luma_key' , are processed to
become transparent (namely, 'transparency-processed' ) . Thus,
the specified pixels exhibit full transparency. Meanwhile, each of the remaining pixels, which have luminance values
exceeding ^pper^imit^uma^key' , are maintained at their
original opacity. As a result, the part of the primary video
positioned behind the opaque pixels cannot be viewed by the
user. On the other hand, when the information representing
whether or not ^transparency-processed' has been applied to
the secondary video, namely, λis_luma-key' , is set to Λ0b',
all pixels on the secondary video plane exhibit original
opacities, respectively. As a result, the part of the
primary video positioned behind the secondary video plane
cannot be viewed by the user.
The information specifying the pixels to be transparency-
processed, may be a lower limit of the luminance of the
pixels to be transparency-processed' , namely, λlower__limit_luma_key' . In this case, the pixels having
luminance values not lower than the lower limit are processed to become transparent. Alternatively, the information
specifying the pixels to be transparency-processed, may
include both the lower and upper limits of the luminance of
the pixels to be transparency-processed, Λlower_limit_luma_key' and Λupper_limit__luma_key' . In this
case, the pixels having luminance values ranging between the
lower and upper limits are processed to become transparent.
Meanwhile, the block header 910 may also include information representing a timeline referred to by the associated PiP
metadata (hereinafter, referred to as ΛPiP timeline type
λpip_timeline_type' ) . The block data 920 may include time stamp information indicating a point where PiP metadata is
positioned (hereinafter, referred to as Λpip_metadata_time_stamp' ) . The λpip_timeline__type [k] ' is
determined in accordance with the type of the timeline
referred to by the entries of the above-described
Λpip_metadata_time_stamp [i] ' , namely, the type of the
timeline referred to by PiP metadata.
The block data 920 may also include at least one block of
secondary video composition information (hereinafter,
referred to as λpip_composition_metadata' ) , the number of
which is determined in accordance with
λpip_metadata_time_stamp [i] ' . The i-th
'pip_composition_metadata' is secondary video composition
information which is effective between λpip_metadata_time_stamp [i] ' and
λpip_metadata_time_stamp [i+1] ' .
In detail, the secondary video composition information is
information representing the reproduction position and size
of the secondary video. The secondary video composition
information may include position information of the secondary
video, and size information of the secondary video
(hereinafter, referred to as Λpip_scale [i] ' ) . The position
information of the secondary video includes horizontal position . information of the secondary video (hereinafter,
referred to as Λpip_horizontal_position [i] ' ) , and vertical
position information of the secondary video (hereinafter,
referred to as vpip__vertical_position [i] ' ) . The information
λpip_horizontal_position' represents a horizontal position of
the secondary video displayed on a screen when viewing from
an origin of the screen, and the information
Λpip_vertical_position' represents a vertical position of the secondary video displayed on the screen when viewing from the
origin of the screen. The secondary video plane is adjusted
in presentation position and size (positioning & scaling) ,
based on the composition information, and is then combined
with the primary video plane .
Although the information as to application of Λluma-keying'
to the secondary video has been described in the case of FIG.
10 as being included in the PiP metadata, the information may be recorded in a clip information file, as separate luma-
keying information. Also, this information may be recorded
in stream headers as separate information.
FIG. 11 is a flow chart illustrating an exemplary embodiment
of a data reproducing method according to the present
invention.
When a playlist file is executed which includes reproduction
information as to primary and secondary videos, the
controller 12 checks metadata for managing reproduction of the secondary video (SlO) . The controller 12 then determines
whether or not application of xluma-keying' to the secondary
video has been set, based on the value of Λis_luma_key'
included in the metadata as shown in FIG. 10 (S20) . When
Λis_luma_key' has been set to λlb' , the pixels in the
secondary video, which have luminance values not higher than
Λupper_limit-luma_key' included in the metadata, are
transparency-processed, and are then presented to the user
(S40) . On the other hand, when Λis__luma_key' has been set to
Λ0b' , all pixels in the secondary video are presented at
original opacities (S30) . That is, the pixels are processed to be opaque.
Meanwhile, in place of Λupper_limit_luma_key' ,
'lower__limit_luma_key' may be included in the metadata. In
this case, the controller 12 will transparency-process the
pixels having luminance values not lower than λlower__limit__luma_key' . Both Λlower_limit_luma_key' and
λupper_limit__luma__key' may be included in the metadata. In
this case, the controller 12 will transparency-processed the
pixels having luminance values ranging between
Λlower_limit__luma_key' and λupper_limit_luma_key' .
Meanwhile, when the secondary video is adjusted in size to
have the same size as the primary video, the information as to λluma-keying' included in the metadata may not be applied
to the secondary video.
FIG. 12 is a schematic diagram for conceptually understanding
a flip of the primary and secondary videos carried out using Λluma-keying' in accordance with the present invention.
In the present invention, λflip' means interchange of the sizes of the primary and secondary videos. The position of
the primary video flipped on the display 20 may be identical to or different from the position of the secondary video
displayed before the flipping. One method of the flipping is
to interchange the positions of primary and secondary video
planes such that the primary video plane positioned behind
the secondary video plane is moved to the position of the
secondary video plane, and the secondary video plane is moved
to the original position of the primary video plane, and to
interchange the sizes of the primary and secondary video
planes, simultaneously with the interchange of the positions
of the primary and secondary video planes. That is, flipping may be achieved by interchanging the front and back positions
of the primary and secondary video planes. However, when
xluma-keying' is applied to the secondary video in accordance
with the present invention, it is possible to obtain a flip
effect without interchanging the front and back positions of
the primary and secondary video planes.
Referring to FIG. 12, when the primary and secondary videos
are simultaneously reproduced, the secondary video is
displayed on the secondary video plane positioned before the
primary video plane (1210). Naturally, when the secondary video is adjusted in size to a full size, the primary video
cannot be viewed because it is completely hidden by the
secondary video (1220). When Λluma-keying' is applied to the
secondary video in accordance with the present invention, it
is possible to process the pixels in the secondary video
corresponding to the primary video hidden by the secondary
video plane when the secondary video is adjusted in size to the full size, such that the pixels become transparent. In
this case, accordingly, the primary video can be viewed
through the transparent secondary video (1230) . The pixels
processed such that they become transparent may be specified
using a luminance value for distinguishing the primary and
secondary videos from each other, as described above with
reference to FIG. 9. The pixels to be transparent may also
be specified based on information as to the flipped position and size of the primary video.
As apparent from the above description, in accordance with
the recording medium, data reproducing method and apparatus,
and data recording method and apparatus of the present
invention, it is possible to reproduce primary and secondary
videos such that the primary video is viewed through the
secondary video. Accordingly, there are advantages in that the content provider can compose more diverse contents, to
enable the user to experience more diverse contents.
Industrial Applicability
It will be apparent to those skilled in the art that various
modifications and variations can be made in the present invention without departing from the spirit or scope of the
inventions. Thus, it is intended that the present invention covers the modifications and variations of this invention.

Claims

[CLAIMS]
1. A method of managing reproduction of at least one picture-
in-picture presentation path, comprising:
reproducing management information for managing reproduction of at least a picture-in-picture presentation
path, the management information including luma-keying information on a luma-keying function, the luma-keying
function managing transparency of a secondary video stream,
and the luma-keying information indicating whether the luma-
keying function is applicable to the secondary video stream
when the secondary video stream is not scaled to full size,
the secondary video stream representing the picture-in-
picture presentation path with respect to a primary
presentation path represented by a primary video stream; and
reproducing the primary video stream and the secondary
video stream based on the management information.
2. The method of claim 1, wherein
the luma-keying information indicates a luma-keying threshold value; and
the reproducing the primary video stream and the secondary
video stream step reproduces the secondary video stream such
that pixels of the secondary video stream having luminance
values less than and equal to the luma-keying threshold are displayed fully transparent if the luma-keying function is
applicable to the secondary video data.
3. The method of claim 2, wherein the reproducing the primary
video stream and the secondary video stream step reproduces
the secondary video stream such that pixels of the secondary
video stream having luminance values greater than the luma- keying threshold are displayed fully opaque if the luma-
keying function is applicable to the secondary video data.
4. The method of claim 1, wherein
the luma-keying information indicates a luma-keying threshold
value; and the reproducing the primary video stream and the secondary
video stream step reproduces the secondary video stream such that pixels of the secondary video stream having luminance
values greater than and equal to the luma-keying threshold
are displayed fully transparent if the luma-keying function
is applicable to the secondary video data.
5. The method of claim 1, wherein
the luma-keying information indicates a luma-keying range;
and
the reproducing the primary video stream and the secondary
video stream step reproduces the secondary video stream such that pixels of the secondary video stream having luminance
values falling within the luma-keying range are displayed
fully transparent if the luma-keying function is applicable
to the secondary video data.
6. The method of claim 1, wherein the management information
includes composition information, and the composition
information includes position information indicating a
position to display the secondary video stream.
7. The method of claim 6, wherein the position information includes vertical position information indicating a vertical
position to display a top left pixel of the secondary video
stream on a display of the primary video stream.
8. The method of claim 6, wherein the position information
includes horizontal position information indicating a
horizontal position to display a top left pixel of the
secondary video stream on a display of the primary video
stream.
9. The method of claim 8, wherein the position information
includes vertical position information indicating a vertical
position to display a top left pixel of the secondary video
stream on a display of the primary video stream.
10. The method of claim 9, wherein the composition
information includes scale information indicating a size to
display the secondary video stream.
11. The method of claim 10, wherein the scale information
indicates a scale of the display of the secondary video
stream with respect to the primary video stream, and the scale information indicates one of no scale, one-half scale,
one-quarter scale, one and one-half scale, and full scale.
12. The method of claim 10, wherein the reproducing the
primary video stream and the secondary video stream step
reproduces the primary and secondary video streams such that
the secondary video stream is displayed at a position
indicated by the position information and at a size indicated
by the scale information.
13. The method of claim 6, wherein the reproducing the
primary video stream and the secondary video stream step
reproduces the primary and secondary video streams such that
the secondary video stream is displayed at a position
indicated by the position information.
14. The method of claim 1, wherein the management information includes composition information, the composition information
includes scale information indicating a size to display the
secondary video stream.
15. The method of claim 1, wherein the reproducing management
information step reproduces the luma-keying information as
metadata from a playlist recorded in the management area of
the recording medium.
16. The method of claim 1, wherein the reproducing the
primary video stream and the secondary video stream step decodes the secondary video stream using a different decoder
than a decoder used to decode the primary video stream.
17. A method of managing reproduction of at least one
picture-in-picture presentation path, comprising:
reproducing management information for managing
reproduction of at least a picture-in-picture presentation
path, the management information including luma-keying
information for a luma-keying function, the luma-keying
function managing transparency of a secondary video stream,
and the luma-keying function changing if the secondary video
stream is scaled to full size, the secondary video stream
representing the picture-in-picture presentation path with
respect to a primary presentation path represented by a primary video stream; and
reproducing the primary video stream and the secondary
video stream based on the management information.
18. A method of managing reproduction of at least one picture-in-picture presentation path, comprising:
reproducing management information for managing
reproduction of at least a picture-in-picture presentation path, the management information including luma-keying information on a luma-keying function and composition
information, the luma-keying function managing transparency of a secondary video stream, and the composition information
including position information indicating a position to display the secondary video stream, the secondary video
stream representing the picture-in-picture presentation path
with respect to a primary presentation path represented by a
primary video stream; and
reproducing the primary video stream and the secondary
video stream based on the management information.
19. An apparatus for managing reproduction of at least one
picture-in-picture presentation path, comprising:
a driver configured to drive a reproducing device to
reproduce data from the recording medium; and
a controller configured to control the driver to reproduce management information for managing reproduction of at least a picture-in-picture presentation path, the management
information including luma-keying information on a luma-
keying function, the luma-keying function managing
transparency of a secondary video stream, and the luma-keying
information indicating whether the luma-keying function is
applicable to the secondary video stream when the secondary
video stream is not scaled to full size, the secondary video stream representing the picture-in-picture presentation path
with respect to a primary presentation path represented by a
primary video stream; and
the controller configured to control the driver to
reproduce the primary video stream and the secondary video
stream based on the management information.
20. The apparatus of claim 19, wherein
the luma-keying information indicates a luma-keying threshold value; and
the controller is configured to control reproduction of the
primary video stream and the secondary video stream such that
pixels of the secondary video stream having luminance values
less than and equal to the luma-keying threshold are
displayed fully transparent if the luma-keying function is
applicable to the secondary video data.
21. The apparatus of claim 20, wherein the controller is
configured to control reproduction of the primary video
stream and the secondary video stream such that pixels of the
secondary video stream having luminance values greater than
the luma-keying threshold are displayed fully opaque if the
luma-keying function is applicable to the secondary video
data.
22. The apparatus of claim 19, wherein
the luma-keying information indicates a luma-keying threshold
value; and
the controller is configured to control reproduction of the
primary video stream and the secondary video stream such that
pixels of the secondary video stream having luminance values
greater than and equal to the luma-keying threshold are
displayed fully transparent if the luma-keying function is
applicable to the secondary video data.
23. The apparatus of claim 19, wherein
the luma-keying information indicates a luma-keying range; and
the controller is configured to control reproduction of the
primary video stream and the secondary video stream such that
pixels of the secondary video stream having luminance values
falling within the luma-keying range are displayed fully transparent if the luma-keying function is applicable to the
secondary video data.
24. The apparatus of claim 19, wherein the controller is
configured to reproduce the luma-keying information as
metadata from a playlist stored in the recording medium.
25. The apparatus of claim 19, further comprising:
a first decoder configured to decode the primary video
stream; and
a second decoder configured to decode the secondary
video stream.
26. A method of recording a data structure for managing
reproduction of at least one picture-in-picture presentation
path, comprising:
recording a primary video stream and a secondary video
stream in a data area of the recording medium, the primary
video stream representing a primary presentation path, the
secondary video stream representing a picture-in-picture
presentation path with respect to the primary presentation
path; and
recording management information for managing
reproduction of the picture-in-picture presentation path in a
management area of the recording medium, the management information including luma-keying information on a luma-
keying function, the luma-keying function managing
transparency of the secondary video stream, and the luma-
keying information indicating whether the luma-keying
function is applicable to the secondary video stream when the
secondary video stream is not scaled to full size.
27. The method of claim 26, wherein the luma-keying information indicates a luma-keying threshold value such that,
if the luma-keying function is applicable to the secondary
video data, pixels of the second video stream having
luminance values less than and equal to the luma-keying
threshold are displayed fully transparent.
28. The method of claim 26, wherein the luma-keying
information indicates a luma-keying threshold value such that,
if the luma-keying function is applicable to the secondary
video data, pixels of the second video stream having
luminance values greater than and equal to the luma-keying
threshold are displayed fully transparent.
29. The method of claim 26, wherein the luma-keying
information indicates a luma-keying range such that, if the
luma-keying function is applicable to the secondary video
data, pixels of the second video stream having luminance values falling within the luma-keying range are displayed
fully transparent.
30. The method of claim 26, wherein the recording management
information step records the luma-keying information as
metadata in a playlist in the management area of the
recording medium.
31. The method of claim 26, wherein the recording a primary
video stream and a secondary video stream step records the
primary and secondary video streams such that the primary and secondary video streams can be separated from a data stream
reproduced from the recording medium and decoded by separate
decoders .
32. An apparatus for recording a data structure for managing
reproduction of at least one picture-in-picture presentation path, comprising:
a driver configured to drive a recording device to record
data on the recording medium;
a controller configured to control the driver to record a
primary video stream and a secondary video stream in a data
area of the recording medium, the primary video stream
representing a primary presentation path, the secondary video
stream representing a picture-in-picture presentation path with respect to the primary presentation path; and
the controller configured to control the driver to record
management information for managing reproduction of the
picture-in-picture presentation path in a management area of
the recording medium, the management information including luma-keying information on a luma-keying function, the luma-
keying function managing transparency of the secondary video
stream, and the luma-keying information indicating whether the luma-keying function is applicable to the secondary video
stream when the secondary video stream is not scaled to full
size .
33. The apparatus of claim 32, wherein the luma-keying
information indicates a luma-keying ^threshold value such that, if the luma-keying function is applicable to the secondary
video data, pixels of the second video stream having luminance values less than and equal to the luma-keying
threshold are displayed fully transparent.
34. The apparatus of claim 32, wherein the luma-keying
information indicates a luma-keying threshold value such that,
if the luma-keying function is applicable to the secondary
video data, pixels of the second video stream having
luminance values greater than and equal to the luma-keying
threshold are displayed fully transparent.
35. The apparatus of claim 32, wherein the luma-keying
information indicates a luma-keying range such that, if the
luma-keying function is applicable to the secondary video
data, pixels of the second video stream having luminance
values falling within the luma-keying range are displayed
fully transparent.
36. The apparatus of claim 32, wherein the controller is
configured to record the luma-keying information as metadata
in a playlist in the management area of the recording medium.
37. The apparatus of claim 32, wherein the controller is
configured to control the driver to record the primary video stream and the secondary video stream such that the primary
and secondary video streams can be separated from a data
stream reproduced from the recording medium and decoded by
separate decoders.
38. A recording medium having a data structure for managing
reproduction of at least one picture-in-picture presentation path, comprising:
a data area storing a primary video stream and a
secondary video stream, the primary video stream representing
a primary presentation path, the secondary video stream
representing a picture-in-picture presentation path with respect to the primary presentation path; and
a management area storing management information for
managing reproduction of the picture-in-picture presentation
path, the management information including luma-keying
information on a luma-keying function, the luma-keying
function managing transparency of the secondary video stream,
and the luma-keying information indicating whether the luma-
keying function is applicable to the secondary video data when the secondary video stream is not scaled to full size.
39. The recording medium of claim 38, wherein the management
information further includes presentation timing information
indicating a timing of when to display the secondary video
stream with the primary video stream.
40. The recording medium of claim 38, wherein the management
information further includes a playitem identifier
identifying a playitem of the primary video stream with which
the secondary video stream is to be reproduced.
41. The apparatus of claim 19, further comprising:
at least one filter configured to separate at least one
of the primary video stream and the secondary video stream
from data reproduced from the recording medium.
42. The method of claim 18, wherein the reproducing the
primary video stream and the secondary video stream step
decodes the secondary video stream using a different decoder
than a decoder used to decode the primary video stream.
PCT/KR2006/002979 2005-07-29 2006-07-28 Recording medium, method and apparatus for reproducing data and method and apparatus for recording data WO2007013778A1 (en)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US70346205P 2005-07-29 2005-07-29
US70346605P 2005-07-29 2005-07-29
US60/703,462 2005-07-29
US60/703,466 2005-07-29
US71014405P 2005-08-23 2005-08-23
US60/710,144 2005-08-23
KR1020060037778A KR20070014948A (en) 2005-07-29 2006-04-26 Recording medium, method and apparatus for reproducing data and method and eapparatus for recording data
KR10-2006-0037778 2006-04-26

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WO2003005362A1 (en) * 2001-07-07 2003-01-16 Lg Electronics Inc. Method and apparatus of recording/reproducing multi-channel stream

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Publication number Priority date Publication date Assignee Title
WO2003005362A1 (en) * 2001-07-07 2003-01-16 Lg Electronics Inc. Method and apparatus of recording/reproducing multi-channel stream

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* Cited by examiner, † Cited by third party
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