WO2011002153A2

WO2011002153A2 - Recording medium, data recording/reproducing method, and data recording/reproducing apparatus

Info

Publication number: WO2011002153A2
Application number: PCT/KR2010/002788
Authority: WO
Inventors: Woo Seong Yoon; Kang Soo Seo; Si Jeong Ro
Original assignee: Lg Electronics Inc.
Priority date: 2009-06-30
Filing date: 2010-05-03
Publication date: 2011-01-06
Also published as: WO2011002153A3; KR101596832B1; KR20110001380A

Abstract

A method and apparatus for reproducing a graphic stream together with a video stream as a three-dimensional image when recording/reproducing data and a recording medium on/from which data is recorded/reproduced using the method and apparatus are provided. The recording medium includes a video stream including image data, a graphic stream reproduced together with the video stream, and a data zone in which stereoscopic display information for displaying the graphic stream as a three-dimensional image is recorded. The stereoscopic display information includes first stereoscopic display information for displaying the graphic stream as the three-dimensional image in the frame units. Accordingly, the graphic stream recorded/reproduced on/from the recording medium can be stereoscopically reproduced as the three-dimensional image.

Description

RECORDING MEDIUM, DATA RECORDING/REPRODUCING METHOD, AND DATA RECORDING/REPRODUCING APPARATUS

The present invention relates to a recording medium, a data recording/reproducing method, and a data recording/reproducing apparatus, and, more particularly, to a method and apparatus for reproducing a graphic stream together with a video stream as a three-dimensional image when recording/reproducing data, and a recording medium on/from which data is recorded/reproduced using the method and apparatus.

Recently, with the rapid development of technology, high-capacity recording media have appeared. Examples of such recording media include Blu-ray discs, near field recording media, and the like.

Early recording media had a main function for recording/reproducing a low-capacity two-dimensional image. However, with the appearance of high-capacity recording media, functions for recording/reproducing a three-dimensional image with high capacity are now required. Accordingly, a recording medium, on which three-dimensional image data is recorded, and apparatuses for recording/reproducing data on/from the recording medium have been developed.

Therefore, there is a need for an efficient method and apparatus for displaying a graphic stream, such as a menu or a subtitle, reproduced together with a video stream which is three-dimensional image data.

An object of the present invention devised to solve the problem lies on an efficient method and apparatus for displaying a graphic stream as a three-dimensional image when recording/reproducing data on/from a recording medium.

The object of the present invention can be achieved by providing a recording medium including: a video stream including image data; a graphic stream reproduced together with the video stream; and a data zone in which stereoscopic display information for displaying the graphic stream as a three-dimensional image is recorded, wherein the stereoscopic display information includes first stereoscopic display information for displaying the graphic stream as the three-dimensional image in the page units.

The stereoscopic display information may further include second stereoscopic display information for displaying an object configuring the graphic stream as the three-dimensional image in the frame units.

The stereoscopic display information may include an offset which is information for moving the graphic stream in a horizontal direction.

The stereoscopic display information may be included in the graphic stream.

The graphic stream may be a presentation graphic stream or an interactive graphic stream.

In another aspect of the present invention, provided herein is a data recording method including: recording a video stream including image data and a graphic stream reproduced together with the video stream in a data zone of a recording medium; and recording stereoscopic display information for displaying the graphic stream as a three-dimensional image in the data zone, wherein the stereoscopic display information includes first stereoscopic display information for displaying the graphic stream as the three-dimensional image in the frame units.

In another aspect of the present invention, provided herein is a data reproducing method including: reading a video stream including image data and a graphic stream reproduced together with the video stream from a data zone of a recording medium; reading stereoscopic display information for displaying the graphic stream as a three-dimensional image from the data zone; and reproducing the graphic stream as the three-dimensional image according to the stereoscopic display information, wherein the stereoscopic display information includes first stereoscopic display information for displaying the graphic stream as the three-dimensional image in the frame units.

In another aspect of the present invention, provided herein is a data recording apparatus including: a pickup configured to record data on a recording medium; and a controller configured to control the pickup to record a video stream including image data and a graphic stream reproduced together with the video stream in a data zone of the recording medium and to record stereoscopic display information for displaying the graphic stream as a three-dimensional image in the data zone of the recording medium, wherein the stereoscopic display information includes first stereoscopic display information for displaying the graphic stream as the three-dimensional image in the frame units.

In another aspect of the present invention, provided herein is a data reproducing apparatus including: a pickup configured to read data from a recording medium; a decoder configured to convert a video stream including image data and a graphic stream reproduced together with the video stream into image data capable of being output on a screen; and a controller configured to control the pickup to read the video stream and the graphic stream from a data zone of the recording medium and to read stereoscopic display information for displaying the graphic stream as a three-dimensional image from the data zone, and to control the decoder to reproduce the graphic stream as the three-dimensional image according to the stereoscopic display information, wherein the stereoscopic display information includes first stereoscopic display information for displaying the graphic stream as the three-dimensional image in the frame units.

The stereoscopic display information may be included in the graphic stream.

The decoder may include a graphics decoder configured to convert the graphic stream into a graphic image, which is a two-dimensional image, and to output the converted graphic image, and the graphics decoder may move the graphic image in a horizontal direction using the stereoscopic display information.

The decoder may further include an offset relocator configured to calculate the stereoscopic display information of the graphic stream.

The offset relocator may include a first offset relocator configured to calculate the stereoscopic display information which is information for moving the graphic image to the left, and a second offset relocator configured to calculate the stereoscopic display information which is information for moving the graphic image to the right.

The graphics decoder may include a first graphics decoder configured to output the graphic image input to the first offset relocator, and a second graphics decoder configured to output the graphic image input to the second offset relocator.

The decoder may further include a clone unit configured to clone the graphic image and to output the cloned graphic image to the first offset relocator or the second offset relocator.

According to a recording medium, a data recording/reproducing method, and a data recording/reproducing apparatus of the present invention, a graphic stream recorded/reproduced on/from the recording medium can be stereoscopically reproduced as a three-dimensional image. Stereoscopic display information for displaying the graphic stream as the three-dimensional image can be efficiently managed. Since a decoder for efficiently decoding the graphic stream is provided, a reproduction time of the graphic stream can be reduced.

The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the principle of the invention.

In the drawings:

FIG. 1 is a diagram showing combined use of a recording medium, a data reproducing apparatus and a peripheral device according to an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a recording medium according to an embodiment of the present invention.

FIG. 3 is a conceptual diagram illustrating decoding of an AV stream into a three-dimensional image according to an embodiment of the present invention.

FIG. 4 is a conceptual diagram of an offset according to an embodiment of the present invention.

FIG. 5 is a conceptual diagram of a global offset according to an embodiment of the present invention.

FIG. 6 is a conceptual diagram of a local offset according to an embodiment of the present invention.

FIG. 7 is a structural diagram of a Presentation Composition Segment (PCS) according to an embodiment of the present invention.

FIG. 8 is a structural diagram of an Interactive Composition Segment (ICS) according to an embodiment of the present invention.

FIG. 9 is a structural diagram of an Offset Definition Segment (ODS) according to a first embodiment of the present invention.

FIG. 10 is a structural diagram of an ODS according to a second embodiment of the present invention.

FIG. 11 is a block diagram of a data recording/reproducing apparatus according to an embodiment of the present invention.

FIG. 12 is a block diagram of an AV decoder according to a first embodiment of the present invention.

FIG. 13 is a block diagram of an AV decoder according to a second embodiment of the present invention.

FIG. 14 is a block diagram of an AV decoder according to a third embodiment of the present invention.

Hereinafter, the preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, like components are denoted by the same names and the same reference numerals, for convenience of description.

In addition, although the terms used in the present invention are selected from generally known and used terms, some of the terms mentioned in the description of the present invention have been selected by at the discretion of the applicant, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present invention is understood, not simply by the actual terms used but by the meanings of each term lying within.

A “recording medium” in the present invention includes all media on which data is recorded or can be recorded, such as an optical disc or a magnetic tape. For convenience of description and better understanding of the present invention, an optical disc, such as a Blu-ray Disc (BD), will hereinafter be exemplarily used as a recording medium in the present invention. It should be noted that technical ideas of the present invention are applicable to other recording media without departing from the scope and spirit of the invention.

A three-dimensional effect of a three-dimensional image indicates that a three-dimensional image is displayed so as to appear to be located at a predetermined distance from an output device (displayer) in a user direction. A large three-dimensional effect indicates that a three-dimensional image is displayed so as to be located close to a user and a small three-dimensional effect indicates that a three-dimensional image is displayed so as to be located far away from a user.

The present invention refers to US Patent Laid-Open No. US 2006/0222334 A1 and BD Technical White Paper published by Blu-ray Disc Association (BDA), as the general contents related to a Presentation Composition Segment (PCS) and an Interactive Composition Segment (ICS).

FIG. 1 is a diagram showing combined use of a recording medium, a data reproducing apparatus and a peripheral device according to an embodiment of the present invention. The recording medium and the data reproducing apparatus according to the present invention have a main function of providing a three-dimensional image to a user.

In a method of providing a three-dimensional image to a user, user’s left and right eyes are shown the same object from different directions so as to obtain a three-dimensional effect using binocular disparity. Accordingly, two-dimensional images with binocular disparity are separately output to the left and right eyes. A three-dimensional image is provided to a user such that a left image is exposed to a left eye and a right image is exposed to a right eye alternately through special glasses such as polarized glasses.

Accordingly, three-dimensional image data, that is, left view image data and right view image data, is recorded on the recording medium 10 according to the embodiment of the present invention. In addition, graphic data, such as a menu or a subtitle, which is reproduced together with image data, is recorded.

The data reproducing apparatus (player) 11 according to the embodiment of the present invention reads and decodes the three-dimensional image data recorded on the loaded recording medium 10. The left view image data and the right view image data are sequentially read and decoded into one piece of three-dimensional image data. In addition, graphic data is decoded into a three-dimensional image. The decoded three-dimensional image data and graphic data are provided to an output device (display) 12.

The output device 12 renders the three-dimensional image data and graphic data decoded by the data reproducing apparatus 11, and outputs and provides them to a user. The user wears special glasses 13 such as polarized glasses and views a three-dimensional image. Although a stereoscopic method using special glasses is described herein, the present invention is applicable to an autostereoscopic method.

FIG. 2 is a schematic structural diagram of a recording medium 10 according to an embodiment of the present invention.

FIG. 2 shows a single-layer recording medium 10 having a single layer. However, the present invention is not limited thereto and the present invention is applicable to all recording media having two or more layers. Since the layers may have the same structure, the single layer will be described in the present invention.

The recording medium 10 according to the present invention includes an inner zone 210, an outer zone 230, and a data zone 220.

The inner zone 210 is located at an inner circumferential side of the recording medium 10 and the outer zone 230 is located at an outer circumferential side of the recording medium 10. A variety of information for controlling the recording medium 10 is stored in the inner zone 210 and the outer zone 230.

Data which the user desires to record is stored in the data zone 220. A portion surrounded by the inner zone 210 and the outer zone 230 of the recording medium 10 is a zone in which data is actually recorded.

The data recorded in the data zone 220 may include, for example, a multiplexed AV stream of a specific movie title. The AV stream includes a video stream, which is image data, and a graphic stream, such as a menu or a subtitle, which is an image reproduced together with the video stream.

The video stream is two-dimensional video data or three-dimensional video data. The video stream which is the three-dimensional video data may include left view image data and right view video data. The data reproducing apparatus reads both the left view video data and the right view video data, decodes them into one three-dimensional image, and reproduces the image.

The graphic stream is reproduced together with the video stream, and includes a presentation graphic stream and an interactive graphic stream.

The presentation graphic stream is fixed image data and, for example, includes a subtitle, a picture, or the like. The interactive graphic stream is image data for generating a predetermined effect according to the selection of the user, and, for example, includes a menu or the like.

The graphic stream includes two-dimensional image data or three-dimensional image data. The graphic stream including the three-dimensional image data may include a left view graphic stream and a right view graphic stream, similar to the video stream. In contrast, in the graphic stream including the two-dimensional image data, the data reproducing apparatus may generate left view image data and right view image data using stereoscopic display information for displaying the graphic stream as a three-dimensional image.

Hereinafter, the display of the graphic stream including the two-dimensional image data as the three-dimensional image using the stereoscopic display information will be described.

In order to decode the AV stream into the three-dimensional image, the data reproducing apparatus decodes the video stream and the graphic stream into left view video and image data and right view video and image data, respectively. The data reproducing apparatus simultaneously outputs the decoded left and right view video and image data and displays the AV stream as a three-dimensional image.

As to the left view, the data reproducing apparatus generates a video plane in which the left view video data is displayed and a graphic plane in which the left view image data is displayed. Then, the data reproducing apparatus overlays the video plane with the graphic plane. Thus, the three-dimensional graphic image is displayed and output in front of the three-dimensional video image. The data reproducing apparatus decodes the overlaid video plane and graphic plane into one image obtained by combining the video image and the graphic image, and outputs the decoded image to the user.

The data reproducing apparatus generates a left view graphic plane using the graphic stream including the two-dimensional image data and the stereoscopic display information for displaying the graphic stream as the three-dimensional image. In the present invention, the stereoscopic display information for displaying the graphic stream as the three-dimensional image is referred to as an offset.

FIG. 4 is a conceptual diagram of an offset 400 according to an embodiment of the present invention.

In order to display the graphic stream including the two-dimensional image data as the three-dimensional image, the left view image data and the right view image data of the graphic stream are generated.

As shown in the drawing, the left view image data L Graphic may be generated by moving the graphic stream to the left by a predetermined distance. The right view image data R Graphic may be generated by moving the graphic stream to the right by a predetermined distance. The data reproducing apparatus reads and decodes both the left view image data L Graphic and the right view image data R Graphic into one three-dimensional image and reproduces the three-dimensional image.

The movement distance value may be defined by the offset 400, and the offset 400 becomes the stereoscopic display information for displaying the graphic stream as the three-dimensional image.

The size of the offset 400 indicates the size of the three-dimensional effect of the graphic stream. The three-dimensional effect of the graphic stream is increased by the offset 400, that is, the movement distance of the graphic stream in a horizontal direction. In other words, if the offset 400 is set to be large, the graphic stream is displayed so as to be located close to the user and, if the offset 400 is set to be small, the graphic stream is displayed so as to be located far away from the user. Accordingly, the data reproducing apparatus or the user may adjust the stereoscopic degree of the graphic stream using the offset 400.

In the embodiment of the present invention, the offset 400 includes a global offset 500 and a local offset 600. Hereinafter, the global offset 500 and the local offset 600 will be described in detail.

FIG. 5 is a conceptual diagram of a global offset 500 according to an embodiment of the present invention.

The global offset 500 is information for displaying the graphic stream with a three-dimensional effect in the frame units.

The global offset 500 is a value for displaying the graphic stream with a predetermined three-dimensional effect, that is, the movement distance value of the whole graphic stream in a horizontal direction, in order to display the graphic stream as the three-dimensional image. The data reproducing apparatus moves the whole graphic stream in the horizontal direction according to the global offset 500 so as to generate the left view image data and the right view image data. Thus, the graphic stream is displayed with the three-dimensional effect.

In the drawing, a three-dimensional effect of a 3D menu is displayed by the global offset 500 for the 3D menu, and a three-dimensional effect of a 3D subtitle is displayed by the global offset 500 for the 3D subtitle.

The global offset 500 may be set in every frame. The data reproducing apparatus may change the global offset 500 for the graphic stream in every frame and change the three-dimensional effect of the graphic stream in every frame.

Accordingly, the data reproducing apparatus may flexibly and stereoscopically display the graphic stream as the three-dimensional image using the global offset 500. For example, if the three-dimensional effect of the video stream is greater than that of the graphic stream in one screen, image display interference occurs between the video stream and the graphic stream. That is, the graphic stream with the small three-dimensional effect is not displayed to the user by the video stream with the large three-dimensional effect. In this case, the data reproducing apparatus adjusts the global offset 500 for the graphic stream such that the graphic stream is displayed in front of the video stream in the screen.

FIG. 6 is a conceptual diagram of a local offset 600 according to an embodiment of the present invention.

The local offset 600 is information for displaying objects configuring a graphic stream with a three-dimensional effect in the frame units.

The graphic stream includes objects. For example, a presentation graphic stream for displaying a subtitle includes objects of characters and an interactive graphic stream for displaying a menu includes objects of buttons of the menu. In the drawing, a 3D menu which is the interactive graphic stream includes objects of an “OK” button, a “CANCEL” button and a “NEXT” button.

The local offset 600 is a value for displaying each of the objects of the graphic stream with a three-dimensional effect. The data reproducing apparatus displays the graphic stream with a predetermined three-dimensional effect using the global offset 500 and displays the objects configuring the graphic stream with respective three-dimensional effects using the local offset 600.

In the drawing, the 3D menu is displayed with the three-dimensional effect by the global offset 500 for the 3D menu. In addition, the “OK” button, the “CANCEL” button and the “NEXT” button configuring the 3D menu are displayed with different three-dimensional effects by the local offset 600. The “OK” button is displayed with a greater three-dimensional effect than that of the global offset 500, and the “NEXT” button is displayed with a smaller three-dimensional effect than that of the global offset 500. The “CANCEL” button is displayed with the same three-dimensional effect as the global offset 500.

The local offset 600 may be set in every frame, similar to the global offset 500. The data reproducing apparatus may change the local offset 600 in every frame and change the three-dimensional effects of the objects in the screen.

Accordingly, the data reproducing apparatus may differently set the three-dimensional effects with respect to the objects of the graphic stream using the local offset 600 so as to display the graphic stream with a precise three-dimensional effect.

A method of configuring the global offset 500 and the local offset 600 according to one embodiment of the present invention will be described.

First, the data reproducing apparatus calculates the global offset 500 and the local offset 600 for the graphic stream in every frame. The data reproducing apparatus calculates the global offset 500 and the local offset 600 for the graphic stream such that image display interference does not occur between the graphic stream and the video stream or another graphic stream. The data reproducing apparatus displays the graphic stream as the three-dimensional image using the global offset 500 and the local offset 600 calculated in every frame. Accordingly, a data recording apparatus does not need to record the global offset 500 and the local offset 600 for the graphic stream on the recording medium.

Second, the graphic stream is configured to include the global offset 500 and the local offset 600. The data reproducing apparatus displays the graphic stream as the three-dimensional image using the global offset 500 and the local offset 600 included in the graphic stream. Accordingly, since the data reproducing apparatus does not calculate the global offset 500 and the local offset 600 for the graphic stream in every frame, a time necessary for decoding the graphic stream into the three-dimensional image and outputting the three-dimensional image can be reduced.

The global offset 500 and the local offset 600 for the graphic stream may be included in a segment of the graphic stream. The segment is display control information of the graphic stream and may be recorded in the graphic stream. The size, the color and the like of the graphic stream are determined according to the information recorded in the segment and the graphic stream is output as an image. Hereinafter, the segment including the global offset 500 and the local offset 600 will be described in detail with reference to FIGs. 7 to 9.

The PCS is display control information of a presentation graphic stream. The global offset 500 and the local offset 600 for the presentation graphic stream may be recorded in the PCS. The PCS includes a default offset field, a use_relocator_flag field and a local offset field.

In the default offset field, the global offset 500 for the presentation graphic stream is recorded.

In the use_relocator_flag field, information indicating whether or not offset relocators 920 and 930 are used is recorded. If the use_relocator_flag field is set to indicate that the offset relocators 920 and 930 are used, the global offset 500 and the local offset 600 for the graphic stream are calculated by the offset relocators 920 and 930 and thus the

offsets

500 and 600 recorded in the PCS are not used.

In the local offset field within a composition_object() field, the local offset 600 for the object of the presentation graphic stream specified by the composition_object() field is recorded.

The ICS is display control information of an interactive graphic stream. In the ICS, the global offset 500 and the local offset 600 for the interactive graphic stream may be recorded.

The ICS includes a default offset field, a use_relocator_flag field and a local offset field, similar to the PCS. The configurations of the fields may be the same as the PCS.

Unlike the above-described PCS and ICS, a segment including only information about the

offsets

500 and 600 for the graphic stream may be defined. Hereinafter, an Offset Definition Segment (ODS) which is the segment including only the information about the

offsets

500 and 600 for the graphic stream will be described with reference to FIGs. 9 and 10. In the recording medium 10 on which the ODS is recorded, the information about the

offsets

500 and 600 for the graphic stream may not be recorded in the PCS and the ICS.

The ODS according to the first embodiment of the present invention includes a segment_descriptor() field, a number_of_offsets field, and an offset() field.

In the segment_descriptor() field, information about the ODS is recorded. The segment_descriptor() field includes a segment_type field and a segment_length field. Information indicating that the segment is the ODS is recorded in the segment_type field, and the byte size of the ODS is recorded in the segment_length field.

In the number_of_offsets field, information about the number of

offsets

500 and 600 included in the ODS is recorded.

In the offset() field, information about the global offset 500 for the graphic stream or the local offset 600 for the graphic stream is recorded. The offset() field includes an offset_id field, an offset_direction field and an offset_depth field.

In the offset_id field, identification of the offset () field is recorded. The data reproducing apparatus identifies the graphic stream using the information about the

offsets

500 and 600 of the offset() field or the object of the graphic stream.

In the offset_direction field, information about the movement direction of the graphic stream or the object of the graphic stream, that is, information indicating whether the three-dimensional effect is increased or decreased, is recorded. For example, the offset_direction field has a Boolean value, indicates that the three-dimensional effect is decreased by the value of the offset_depth field if it is set to “0”, and indicates that the three-dimensional effect is increased by the value of the offset_depth field if it is set to “1”.

In the offset_depth field, the values of the

offsets

500 and 600 for the graphic stream or the object of the graphic stream are recorded.

If the information about the

offsets

500 and 600 is recorded in the ODS according to the first embodiment of the present invention, the PCS or the ICS should identify the offset() field of the ODS in which the offset information of the graphic stream or the object of the graphic stream is recorded. Accordingly, the PCS or the ICS further includes an offset_id field in which the identification of the offset() field which will be used by the graphic stream or the object of the graphic stream is recorded.

The ODS according to the first embodiment of the present invention may be configured differently from FIG. 9. For example, the ODS may be configured such that the global offset 500 for the graphic stream and the local offset 600 for the objects configuring the graphic stream are divided and recorded. In this case, the information about the global offset 500 is recorded in a global_offset() field (not shown), and the information about the local offset 600 is recorded in a local_offset() field (not shown).

As another example, the ODS may be configured such that the information about the

offsets

500 and 600 is divided and recorded according to graphic streams. In this case, the ODS includes a stream() field (not shown), and the stream() field includes a stream_id field, a default_offset field, a composition() field, and a local_offset field within the composition() field. In the stream_id field, the identification of the graphic stream is recorded. Similar to the PCS or the ICS, the global offset 500 and the local offset 600 are recorded in the default_offset field and the local_offset field.

The structure of the ODS according to the first embodiment of the present invention is not limited thereto and may be variously modified within a range including both the information about the

offsets

500 and 600 for the graphic stream.

In the ODS according to the second embodiment of the present invention, the

offsets

500 and 600 are recorded as pixel information of a screen. That is, information indicating by how many pixels the graphic stream or the object of the graphic stream is moved on the screen is recorded.

The pixel information of the

offsets

500 and 600 is recorded in a depth() field, and the depth() field includes a depth_id field, a depth_version_number field, a depth_direction field, and a depth_entry() field.

In the depth_id field, the identification of the depth() field is recorded.

In the depth_version_number field, version information changed by updating the information of the depth() field is recorded.

In the depth_direction field, information about the movement direction of the graphic stream or the object of the graphic stream, that is, information indicating whether the three-dimensional effect is increased or decreased, is recorded.

In the depth_entry() field, pixel information is recorded. The depth_entry() field includes a pixel_count field, a pixel_size_info field, a screen_size_info field, and a depth_info field.

In the pixel_count field, information about the number of pixels is recorded. Accordingly, the graphic stream or the object of the graphic stream using the depth() field is moved by the value of the pixel_count field in a direction indicated by the value of the depth_direction field.

In the pixel_size_info field, size information of the pixel used in the depth() field is recorded.

In the screen_size_info field, size information of the screen is recorded.

In the depth_info field, depth information of the three-dimensional effect is recorded. That is, information indicating at which depth the graphic stream or the object of the graphic stream is displayed on the screen is recorded.

The number of pixels by which the graphic stream or the object of the graphic stream is moved in order to obtain the same three-dimensional effect may be changed according to the size of the screen. Accordingly, the data recording/reproducing apparatus may correct the number of pixels, that is, the

offsets

500 and 600, using the value of the screen_size_info field and the value of the depth_info field.

If the pixel information of the

offsets

500 and 600 is recorded in the ODS according to the second embodiment of the present invention, the PCS or the ICS further includes a depth_id field in which the identification of the depth() field to be used by the graphic stream or the object of the graphic stream is recorded.

The entire configuration of the data recording/reproducing apparatus according to the present invention will be described in detail. A recording/reproducing unit 70 records or reads data on or from a recording medium 10. The recording/reproducing unit 70 may be a pickup 70 according to one embodiment of the present invention. The pickup 70 includes a laser diode therein so as to record data on a surface of the recording medium 10 or to read a signal reflected from the recording medium 10.

A servo 90 controls a tracking and focusing operation of the pickup and an operation of a spindle motor 110.

An R/F unit 80 generates a focus error signal and a tracking error signal, both of which are respectively a focus deviation signal and a track deviation signal of a laser beam, using the signal output from the pickup 70.

The spindle motor 110 rotates a disc mounted in the data recording/reproducing apparatus.

A motor driving unit 100 drives the pickup 70 and the spindle motor 110 under the control of the servo 90.

A signal processor 40 restores an RF signal received from the R/F unit 80 into a desired reproduction signal value, modulates a data signal to be recorded to a format recordable by the recording medium 10, and outputs the modulated signal.

A bit encoder 50 converts a recording signal output from the signal processor 40 into a bit stream, and a pickup driving unit 60 converts the bit stream generated by the bit encoder 50 into an optical signal to be stored in the recording medium 10.

A memory 150 performs a buffer function for temporarily storing information associated with the recording medium 10, such as defect information of the recording medium 10 or temporarily storing data to be recorded or reproduced on or from the recording medium 10.

A microcomputer 120 is configured to control the signal processor 40, the servo 90 and the memory 150 and to control a drive including components to perform a data recording or reproducing operation.

A 3D controller 130 generates a segment including a global offset 500 and a local offset 600 which are stereoscopic display information for displaying a graphic stream as a three-dimensional image. The segment includes a PCS, an ICS and an ODS.

The global offset 500 is information for displaying the graphic stream with a three-dimensional effect in the frame units. The local offset 600 is information for displaying objects configuring the graphic stream with a three-dimensional effect in the frame units. The global offset 500 and the local offset 600 may be calculated by the microcomputer 120 or the 3D controller 130 or may be directly received from a host 140.

The 3D controller 130 transmits the generated segment to the signal processor 40 or the microcomputer 120 such that the segment is recorded on the recording medium 10 together with a graphic stream.

Although the 3D controller 130 is shown as one component, the present invention is not limited thereto. The function of the 3D controller 130 may be performed in interlock with several components and the 3D controller 130 may be integrally implemented with the microcomputer 120 and/or the host 140. In addition, the 3D controller 130 may be further connected to the drive including the signal processor 40, the bit encoder 50, the pickup driving unit 60, the pickup 70, the servo 90, the motor driving unit 100, the spindle motor 110, the microcomputer 120 and the memory 150 so as to be updated.

The host 140 controls all the components of the data recording/reproducing apparatus and interfaces with the user so as to control the recording or the reproduction of the recording medium 10. More particularly, the host 140 transmits a command for enabling the data recording/reproducing apparatus of the present invention to perform a specific function to the microcomputer 120, and the microcomputer 120 controls components configured to be interlocked with each other in the data recording/reproducing apparatus according to the command.

The microcomputer 120 and the host 140 may be separately operated. Alternatively, the microcomputer 120, the 3D controller 130 and the host 140 may be combined and operated as one control unit.

The host 140 may be a main controller of a computer, a server, an audio device or a video device. That is, the recording/reproducing apparatus of the present invention may be an optical drive provided in a Personal Computer (PC) or the like or a player which is not mounted in a PC or the like.

Accordingly, the data recording/reproducing apparatus according to the present invention is applicable to an optical drive mounted and operated in a PC or a player used as a single product.

An AV encoder 20 converts an input signal into a specific-format signal recordable on the recording medium 10 and transmits the converted signal to the signal processor 40, in order to record data on the recording medium 10. For example, the AV encoder 20 may encode the input signal into a Moving Picture Experts Group (MPEG) format signal. The signal processor 40 adds an Error Correction Code (ECC) to the signal encoded by the AV encoder 20, converts the signal into a format recordable on the recording medium 10, and transmits the converted signal to the bit encoder 50.

The AV decoder 30 finally decodes a reproduction signal of the recording medium 10 received from the signal processor 40 and provides the decoded signal to the user as output data such as a video signal, an audio signal and a graphic signal. The graphic signal may be composed of a graphic stream signal which is two-dimensional image data.

The AV decoder 30 decodes the graphic stream which is the two-dimensional image data into a three-dimensional image using an offset 400 which is stereoscopic display information for displaying the graphic stream as the three-dimensional image. The AV decoder 30 generates left view image data and right view image data using the offset 400. The AV decoder 30 decodes the left view image data and the right view image data together and outputs the decoded signal as the three-dimensional image.

The AV decoder 30 may calculate the offset 400 which is the stereoscopic display information for displaying the graphic stream as the three-dimensional image. The global offset 500 and the local offset 600 for the graphic stream are calculated such that image display interference does not occur between the graphic stream and the video stream or another graphic stream.

The configuration of the AV decoder 30 is changed depending on whether or not the offset 400 is calculated or the number of input graphic stream signals. Hereinafter, the AV decoder 30 for decoding the graphic stream as the three-dimensional image will be described.

FIG. 12 is a block diagram of an AV decoder 310 according to a first embodiment of the present invention.

The AV decoder 310 according to the first embodiment of the present invention includes a transport buffer 810, a graphic decoder 800,

graphics plane units

870 and 880, and a color lookup table unit (CLUT) 890. The AV decoder 310 may further include a clone object unit 910.

The transport buffer 810 stores a predetermined amount of a graphic stream to be decoded.

The graphic decoder 800 decodes the graphic stream and generates a graphic plane composed of image data of the graphic stream. The graphic decoder 800 includes a coded data buffer 820, a stream graphics processor 830, a decoded object buffer 840, a composition buffer 850, and a graphics controller 860.

The coded data buffer 820 transmits the graphic stream received from the transport buffer 810 to the stream graphics processor 830 according to a reproduction time of the graphic stream such that decoding is started.

The stream graphics processor 830 transmits the image data of an object to be output to a screen in the graphic stream to the decoded object buffer 840 and transmits a segment, which is information for controlling the image of the object, to the composition buffer 850.

The graphics controller 860 controls the

graphics plane units

870 and 880 to generate graphic planes which are the image data of the graphic stream using the image data of the object stored in the decoded object buffer 840 according to information about the segment stored in the composition buffer 850.

The graphics controller 860 generates a left view graphic plane and a right view graphic plane which are three-dimensional image data, according to the offset 400 recorded in the PCS, the ICS or the ODS. That is, the image of the object is moved by an offset 400 in a horizontal direction so as to generate left view image data and right view image data.

The

graphic plane units

870 and 880 generate graphic planes which are image data of the graphic stream, under the control of the graphics controller 860. The

graphics plane units

870 and 880 include a left graphics plane unit 870 and a right graphics plane unit 880. The left graphics plane unit 870 generates a left graphic plane which is the left view image data and the right graphics plane unit 880 generates a right graphic plane which is the right view image data.

The CLUT 890 controls the color, the transparency and the like of the generated graphic planes under the control of the graphics controller 860.

The clone object unit 910 clones the image data of the object to be output to the screen and transmits the image data to the

graphics plane units

870 and 880. The AV decoder 310 may not include the clone object unit 910 according to implementation methods. In this case, the graphic decoder 800 decodes the graphic stream twice and transmits the image data of the object to be output to the screen to the

graphics plane units

870 and 880.

According to the AV decoder 310 of the first embodiment of the present invention, the offset 400 for the graphic stream is stored in the segment in advance. Accordingly, since the AV decoder 30 does not need to perform an operation for separately calculating the offset, the load of the AV decoder 30 is reduced.

FIG. 13 is a block diagram of an AV decoder 320 according to a second embodiment of the present invention.

The AV decoder 320 according to the second embodiment of the present invention includes offset relocators 920 and 930 in addition to the components of the AV decoder 310 according to the first embodiment of the present invention. Other components of AV decoder 320 according to a second embodiment of the present invention are referred to corresponding components of above FIG. 12.

The offset relocators 920 and 930 calculate the global offset 500 and the local offset 600 for the graphic stream. The offset relocators 920 and 930 calculate the global offset 500 and the local offset 600 for the graphic stream such that image display interference does not occur between the graphic stream and the video stream or the another graphic stream.

The offset relocators 920 and 930 include a left (Le) offset relocator 920 and a right (Re) offset relocator 930. The Le offset relocator 920 calculates the global offset 500 and the local offset 600 for left view image data. The Re offset relocator 930 calculates the global offset 500 and the local offset 600 for right view image data.

Accordingly, the graphics controller 860 does not generate a segment recorded in the graphic stream, but generates left and right view graphic planes using the global offset 500 and the local offset 600 calculated by the offset relocators 920 and 930.

Although, in the drawing, the offset relocators 920 and 930 of the AV decoder 320 include the Le offset relocator 920 and the Re offset relocator 930, the AV decoder 320 may include one offset relocator. In this case, the graphics controller 860 moves the graphic stream by the offset calculated by one offset relocator in the left and right directions so as to generate both the left and right view graphic planes.

According to the AV decoder 320 of the second embodiment of the present invention, since the global offset 500 and the local offset 600 need not be recorded in the segment of the graphic stream, the size of the graphic stream can be reduced.

FIG. 14 is a block diagram of an AV decoder 330 according to a third embodiment of the present invention.

The AV decoder 330 according to the third embodiment of the present invention includes two

graphics decoders

801 and 802, unlike the AV decoder 320 according to the second embodiment of the present invention. The clone object unit 910 is not included. Other components of AV decoder 320 according to a second embodiment of the present invention are referred to corresponding components of above FIG. 12.

The two

graphics decoders

801 and 802 include a first graphics decoder 801 and a second graphics decoder 802. The first graphics decoder 801 decodes a graphic stream so as to generate a left view graphic plane. The second graphics decoder 802 decodes the graphic stream so as to generate a right view graphic plane.

Accordingly, the transport buffer 810 stores the same graphic stream twice and transmits the graphic stream to the first graphics decoder 801 and the second graphics decoder 802.

According to the AV decoder 330 of the third embodiment of the present invention, a time necessary for cloning image data of an object is not required and parallel processing of the

graphics decoders

801 and 802 can be performed. Therefore, time necessary for decoding the graphic stream into a three-dimensional image can be reduced.

The components of the data recording/reproducing apparatus according to the present invention may be implemented by software, hardware or a combination thereof so as to perform respective functions.

Various embodiments have been described in the best mode for carrying out the invention.

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 invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims

A recording medium comprising:

a data zone storing a video stream including image data and a graphic stream reproduced together with the video stream, and stereoscopic display information for displaying the graphic stream as the three-dimensional graphic image,

wherein the stereoscopic display information includes at least one offset information and offset number information indicating number of the offset information, the offset information including:

an offset identifier indicating identification information of the offset information,

an offset direction indicating a direction of horizontally shifting the graphic stream, and

an offset value indicating amount of pixels for horizontally shifting the graphic stream.
The recording medium of claim 1, wherein the stereoscopic display information includes the offset information configured in frame units.
The recording medium of claim 1, wherein the offset information further includes pixel size information of a display apparatus, and screen size information of the display apparatus.
The recording medium of claim 1, wherein the stereoscopic display information includes local offset information for displaying an object configuring the graphic stream as the three-dimensional graphic image.
The recording medium of claim 1, wherein the stereoscopic display information is recorded in the graphic stream as a segment.
A data recording method comprising:

recording a video stream including image data and a graphic stream reproduced together with the video stream, and stereoscopic display information for displaying the graphic stream as a three-dimensional graphic image in a data zone of a recording medium,

wherein the stereoscopic display information includes at least one offset information and offset number information indicating number of the offset information, the offset information including:

an offset identifier indicating identification information of the offset information,

an offset direction indicating a direction of horizontally shifting the graphic stream, and

an offset value indicating amount of pixels for horizontally shifting the graphic stream.
The data recording method of claim 6, wherein the stereoscopic display information includes the offset information configured in frame units.
The data recording method of claim 6, wherein the offset information further includes pixel size information of a display apparatus, and screen size information of the display apparatus.
The data recording method of claim 6, wherein the stereoscopic display information includes local offset information for displaying an object configuring the graphic stream as the three-dimensional graphic image.
The data recording method of claim 6, wherein the stereoscopic display information is recorded in the graphic stream as a segment.
A data recording apparatus comprising:

a recording unit configured to record data on a recording medium; and

a controller configured to control the recording unit to record a video stream including image data and a graphic stream reproduced together with the video stream, and stereoscopic display information for displaying the graphic stream as a three-dimensional graphic image in a data zone of the recording medium,

wherein the stereoscopic display information includes at least one offset information and offset number information indicating number of the offset information, the offset information including:

an offset identifier indicating identification information of the offset information,

an offset direction indicating a direction of horizontally shifting the graphic stream, and

an offset value indicating amount of pixels for horizontally shifting the graphic stream.
The data recording apparatus of claim 11, wherein the stereoscopic display information includes the offset information configured in frame units.
The data recording apparatus of claim 11, wherein the offset information further includes pixel size information of a display apparatus, and screen size information of the display apparatus.
The data recording apparatus of claim 11, wherein the stereoscopic display information includes local offset information for displaying an object configuring the graphic stream as the three-dimensional graphic image.
The data recording apparatus of claim 11, wherein the stereoscopic display information is recorded in the graphic stream as a segment.
A data reproducing method comprising:

reading a video stream including image data and a graphic stream reproduced together with the video stream, and stereoscopic display information for displaying the graphic stream as a three-dimensional graphic image from a recording medium; and

reproducing the graphic stream as the three-dimensional graphic image according to the stereoscopic display information,

wherein the stereoscopic display information includes at least one offset information and offset number information indicating number of the offset information, the offset information including:

an offset identifier indicating identification information of the offset information,

an offset direction indicating a direction of horizontally shifting the graphic stream, and

an offset value indicating amount of pixels for horizontally shifting the graphic stream.
The data reproducing method of claim 16, wherein the stereoscopic display information includes the offset information configured in frame units.
The data reproducing method of claim 16, wherein the offset information further includes pixel size information of a display apparatus, and screen size information of the display apparatus.
The data reproducing method of claim 16, wherein the stereoscopic display information includes local offset information for displaying an object configuring the graphic stream as the three-dimensional graphic image.
The data reproducing method of claim 16, wherein the stereoscopic display information is recorded in the graphic stream as a segment.
A data reproducing apparatus comprising:

a reproducing unit configured to read data from a recording medium;

a decoder configured to convert a video stream including image data and a graphic stream reproduced together with the video stream into image data capable of being output on a screen of a display apparatus; and

a controller configured to:

control the reproducing unit to read the video stream and the graphic stream and stereoscopic display information from the recording medium, the stereoscopic display information being information for displaying the graphic stream as the three-dimensional graphic image, and

control the decoder to reproduce the graphic stream as the three-dimensional graphic image according to the stereoscopic display information,

wherein the decoder includes:

a first graphic decoder configured to convert the graphic stream into the graphic image for left view; and

a second graphic decoder configured to convert the graphic stream into the graphic image for right view.
The data reproducing apparatus of claim 21, wherein the decoder further includes an offset unit configured to shift the graphic image horizontally according to the stereoscopic display information.
The data reproducing apparatus of claim 21, wherein the decoder further includes a color unit configured to control color and transparency of the graphic image.
The data reproducing apparatus of claim 22, wherein the offset unit is further configured to calculate the stereoscopic display information of the graphic stream.
The data reproducing apparatus of claim 21, wherein the stereoscopic display information includes at least one offset information and offset number information indicating number of the offset information, the offset information including:

an offset identifier indicating identification information of the offset information,

an offset direction indicating a direction of horizontally shifting the graphic stream, and

an offset value indicating amount of the pixels for horizontally shifting the graphic stream.
A data reproducing method comprising:

reading a first stream including image data and a second stream reproduced together with the first stream, and stereoscopic display information for displaying an object configuring the second stream as a three-dimensional graphic image from a recording medium; and

reproducing the second stream as the three-dimensional graphic image according to the stereoscopic display information,

wherein the stereoscopic display information includes:

an offset direction indicating a direction of horizontally shifting the object configuring the second stream, and

an offset value indicating amount of pixels for horizontally shifting the object configuring the second stream.
The data reproducing method of claim 26, wherein the stereoscopic display information is configured in frame units.
The data reproducing method of claim 26, wherein the stereoscopic display information is recorded in the second stream as a segment.
A data reproducing apparatus comprising:

a reproducing unit configured to read data from a recording medium;

a decoder configured to convert a first stream including image data and a second stream reproduced together with the first stream into image data capable of being output on a screen of a display apparatus; and

a controller configured to:

control the reproducing unit to read the first stream and the second stream and stereoscopic display information from the recording medium, the stereoscopic display information being information for displaying an object configuring the second stream as the three-dimensional graphic image, and

control the decoder to reproduce the second stream as the three-dimensional graphic image according to the stereoscopic display information,

wherein the decoder is configured to convert the second stream into a first graphic image for left view and a second graphic image for right view.
The data reproducing apparatus of claim 29, wherein the decoder further includes an offset unit configured to shift the object configuring the graphic image horizontally according to the stereoscopic display information.
The data reproducing apparatus of claim 29, wherein the decoder further includes a color unit configured to control color and transparency of the object configuring the graphic image.