Patent Application
20110145697
The present invention relates to a device and method of performing presentation based on access to structured information.
Several approaches to solve a problem related to presentation of structured information have been proposed.
A first approach is a programmatic approach utilizing a script, and a second approach is a declarative approach defining additional information in the presentation.
The programmatic approach may be a very useful tool since the approach provides nearly unlimited methods for accessing the structured information.
However, the programmatic approach has a burden due to the use of a predefined script language and requires, from a contents writer, more than a certain level of knowledge, and thus, producing Lightweight Application Scene Representation (LASeR) content that is utilized for presentation of the structured information may be difficult. Also, the programmatic approach may not generally utilize an advantage of a declarative language, such as LASeR.
Here, the LASeR is a multimedia contents standard appropriate to a low-specification mobile device such as a portable phone, and the like, and a service combining a wireless portal, a mobile TV, a music, a personal service, and the like, may be provided through LASeR contents or an LASeR-based system. Also, a lively dynamic effect, an interactive interface, and the like may be embodied.
Also, the programmatic approach may not utilize the advantages of LASeR being a declarative language.
Accordingly, the declarative approach that maintains the advantages of LASeR may be more effective in performing presentation of the structured information.
An eXtensible Markup Language (XML) has been used in various applications. Accordingly, a method of identifying a fragment of a predefined XML data to enable the identified fragment to be used from a different document is required.
Responding to the above-described needs, the World Wide Web Consortium (W3C) has developed technologies such as Xpointer framework and Xpath language.
Moreover, Moving Picture Experts Group (MPEG) has developed a standard related to the identification of a fragment of resources, as a part of an MPEG-21 framework, by utilizing the above described technologies.
Accordingly, there is a need for a device and method of accessing the structured information based on existing standards, to maintain integrity of standards defined by the MPEG, and to minimize the developing efforts of new solutions.
An aspect of the present invention may appropriately point to a fragment of the structured information included in a predefined resource, thereby enabling presentation of the structured information even though the structured information is not included in richmedia and the like.
According to an aspect of an exemplary embodiment, there is provided a scene presentation device, the device including a parsing unit to parse presentation information addressing structured information, and a presentation unit to read the structured information based on the parsing result of the presentation information, and to present a scene.
According to example embodiments, there may appropriately point to a fragment of the structured information included in a predefined resource, thereby enabling presentation of the structured information even though the structured information is not included in richmedia and the like.
Although a few exemplary embodiments of the present invention have been shown and described, the present invention is not limited to the described exemplary embodiments, wherein like reference numerals refer to the like elements throughout.
Recently, various structured format standards, such as Moving Picture Experts Group-21 (MPEG-21) Digital Item Declaration (DID), MPEG-7 standard, TV Anytime standard, and Digital Video Broadcasting Convergence of Broadcast and Mobile Services (DVB CBMS) standard, have been developed for representation of metadata with respect to a multimedia presentation.
Preparing suitable contents based on user's environments is an important key for providing multimedia services.
Also, an assumption that metadata is mostly constituted by text information is no longer true.
Recently, a multimedia asset, such as an image, a graphic, a short clip of video or an audio, and the like, has been used for communicating with media customers in a more effective way.
Multimedia service designers have focused their attention on a temporal/spatial configuration of resources, and on an interactive presentation of information based on a user's input.
Therefore, an interactive richmedia is used for providing information with respect to contents and service.
However, the richmedia is not designed to include a great amount of structured information, thus a method using the richmedia including the metadata may be ineffective.
Accordingly, there is need for a method of appropriately performing presentation of the structured information.
Embodiments of the present invention may appropriately point to a fragment of the structured information included in a predefined resource, thereby enabling presentation of the structured information even though the structured information is not included in richmedia and the like.
The present invention discloses example embodiments as described below.
(a) There may be provided a mechanism for accessing the structured information, thereby enabling temporal/spatial expression of the structured information and enabling change of the structured information through a consistent method. In connection with this, a pointer scheme for the structured information is defined to access a specific fragment of the structured information. In this instance, the pointer scheme is referred to as ‘mpeg-presentation and modification of structured information (pmsi)( ) scheme’.
(b) A Scalable Vector Graphics text reference (SVG tref) element is used for referencing contents constituted by texts.
(c) A Lightweight Application Scene Representation (LASeR) externalReference container element for identifying an update of the structured information at predefined time intervals is defined.
(d) An xmlUpdate event for indicating the change of the referenced structured information is defined.
Hereinafter, embodiments of the present invention will be described in detail with reference to
The mpeg-pmsi( ) scheme is intended to be used together with an XPointer framework, for addressing the fragment of the structured information under the LASeR namespace.
Also, a process for entities addressed by the mpeg-pmsi( ) scheme may be changed depending on a type of node that uses the mpeg-pmsi( ) scheme.
The mpeg-pmsi( ) scheme may be defined as an Extended Backus-Naur Form (EBNF) syntax shown in Table 1 as given below.
PointerforStructuredInformationSchemeData in Table 1 is based on a World Wide Web Consortium (W3C) XPath abbreviated syntax.
Also, the mpeg-pmsi( ) scheme may support an XPath predicate that is used for filtering out a node-set given from undesired nodes.
As an example, Table 2 given below is an expression indicating a ref attribute of the Resource element. Here, the Resource element is a child element of the Component element having a title attribute of ‘video—1’.
Also,
With reference to
That is, to read the fragment 110 from the predefined structured information as illustrated in
In general, specific text information existing within XML data is usually referenced, to express the structured information.
Scalable Vector Graphics (SVG) text reference (tref) element having an xlink attribute is required to search for text information from the referenced XML data and the like. Here, the SVG is a language generated based on the XML to represent a two-dimensional (2D) graphic. Also, the tref is used for referring to a text included in the structured information, and the SVG indicates how to represent the text referenced through the tref.
Accordingly, the present embodiment proposes the use of SVG tref element. The SVG tref element is defined in a sub-clause 10.6 of [W3C SVG11]
Referring to the fragment 210 of
That is, when the text information is referenced from the XML data including the structured information, using the SVG tref element of presentation information and the mpeg-pmsi( ) scheme is disclosed.
The structured information may be changed according to its feature over time. As an example, an Electronic Service Guide (ESG) expressed by a DVB CBMS may be regularly updated to reflect a change occurring in a schedule of a broadcasted program.
Accordingly, there is a need for a mechanism reflecting the update of the structured information when presentation of the structured information is performed.
In connection with the above, the present embodiment proposes a LASeR externalReference element that is a new container element being capable of identifying the update of the structured information at predefined time intervals.
The element name and attributes with respect to the LASeR externalReference may be expressed as given in Table 3 below.
The LASeR externalReference element is a container element including all elements that are regularly updated according to an updateInterval attribute.
When the LASeR externalReference element does not include any external reference, the updateInterval attribute may be ignored. Accordingly, the updateInterval attribute is merely used for a Uniform Resource Locator (URL), together with the mpeg-pmsi( ) scheme. Other URI processing procedure may be performed regardless of the updateInterval attribute.
Also, externalReference element allows children elements.
The updateInterval attribute means an update interval of all elements and attributes included in a corresponding element. In this instance, the updateInterval attribute may be one of “none”, “free”, and “<Clock-value>”.
First, when the updateInterval attribute is “none”, “none” indicates to evaluate the structured information only once. That is, whether the structured information is updated is not evaluated again.
When updateInterval attribute is “free”, the “free” indicates the updateInterval is arbitrary, thus the evaluate the structured information in an arbitrary interval. That is, “free” provides instructions for evaluating the structured information depending on the implementer that embodies a device, at intervals, as opposed to that an author of the presentation that sets the intervals used for evaluating the structured information.
When the updateInterval attribute is “<Clock-value>”, “<Clock-value>” indicates to evaluate the structured information at predefined “<Clock-value>” intervals. In this instance, “<Clock-value>” is required to be greater than ‘0’. That is, when the updateInterval attribute is “<Clock-value>”, the author of the presentation may appropriately set the intervals used for evaluating whether the structured information is updated.
A security attribute controls a type of update allowed in referenced resources. The security attribute is defined in a sub-clause 6.8.53 of ISO/IEC 14496-20.
Referring to a fragment 310 of
The structured information is not referenced by one specific presentation. As an example, contents of the structured information may be changed to a result of another application.
Accordingly, the structured information is variously referenced, and thus, the structured information may be corrected or changed. Therefore, there is a need for the method of informing that the structured information referenced by a presentation engine is changed.
In connection with the above, the present embodiment discloses an xmlUpdate event where the structured information that is changed is identified.
Details with respect to the xmlUpdate event may be expressed as given in Table 4.
The xmlUpdate event may be defined as an Interface Definition Language (IDL) shown in Table 5 as given below.
A resourceURL may identify an updated external resource URL including a mpeg-pmsi( ) fragment.
An updatedValue is an updated value pointed by a resource URL.
A fragment 410 of
Referring to a fragment 420, the present embodiment determines whether the structured information referenced in the fragment 410 is changed, using the xmlUpdate event, and when the structured information is changed, enables the changed structured information to be referenced again through a handler, thereby performing presentation of a changed scene.
As described above, embodiments for performing presentation with reference to the structured information of the external resource have been described.
Hereinafter, a scene presentation device that presents a scene by using structured information will be described based on the disclosed embodiments.
Referring to
The parsing unit 511 parses presentation information addressing structured information. In this instance, the structured information may be metadata specifying what information is to be represented. The structured information may be represented using MPEG-21 Digital Item Declaration (DID) standard, and MPEG-7 standard. Also, the presentation information may be a scene description scheme indicating how to represent the structured information. The presentation information may be represented through a Binary Format for Scenes (BIFS) format and a LASeR format, and also, according to an embodiment of the present invention, a LASeR format may be applicable.
The presentation unit 512 reads the structured information based on the parsing result of the presentation information, and presents on a scene.
As described above, the LASeR standard is a multimedia contents standard, and is a defined as a scene description format for representing and delivering a huge capacity media service, such as a rich media, to a device having a limited resource, such as a mobile phone. That is, the LASeR is to perform a service in response to a desire for the huge capacity media service in a scene description level.
A decoder model of a LASeR system may include a decoding buffer, an elementary stream, at least one decoder, and a composition unit. The decoder model may decode the decoding buffer where data coded for each elementary stream is stored. A result of the decoding may be stored in the composition unit.
In this instance, the scene presentation device 510 may correspond to the decoder. Also, the presentation information that addresses the structured information may correspond to the elementary stream of the LASeR. The presentation information may be stored in the decoding buffer.
When single presentation information is inputted, a single scene presentation device 510 may perform parsing of the presentation information, and may read structured information, thereby presenting a scene.
When a grouped plurality of presentation information is inputted, each of a plurality of scene presentation device 510 may perform parsing of each of the grouped plurality of presentation information, and may read structured information, thereby presenting a scene.
Also, when the grouped plurality of presentation information is inputted and the single scene presentation device 510 exists, the scene presentation device 510 may select one of the plurality of presentation information, and may perform parsing of the selected presentation information to read structured information.
In this instance, according to an embodiment of the present invention, the presentation information may address the structured information based on a predefined scheme. Accordingly, the presentation unit 512 may access a fragment of the structured information addressed by the presentation information, and may present the fragment in the scene.
In this instance, the scheme may be defined according to the syntax shown in Table 1 as given above.
Also, according to an embodiment of the present invention, when the structured information is text information, the presentation information may address the structured information by using an SVG tref element.
As an example, when
<tref xlink: href=“http://www.etrise.kr/test_DI.xml
#mpeg.pmsi(//mpeg7: FreeTextAnnotation/text( ))”/> is written in the presentation information of
Also, according to an embodiment of the present invention, the presentation information may include a predefined container element identifying update of the structured information.
In this instance, the predefined container element may be defined as an externalReference element that has an updateInterval attribute related to the interval used for evaluating the update of structured information.
In this instance, the presentation unit 512 may read the updated structured information based on the parsing result of the presentation information and may present an updated scene.
Also, the presentation unit 512 evaluates the structured information a single time, and thereafter no more evaluating is required, when the updateInterval attribute is set to “none”. Also, the presentation unit 512 presents the updated scene after evaluating the structured information in arbitrary time interval when the updateInterval attribute is set to “free”. Also, the presentation unit 512 evaluates the structured information at “<Clock-value>” period intervals and presents the updated scene when the updateInterval attribute is fixed as “<Clock-value>” being greater than “0”.
As an example, as illustrated in
According to an embodiment of the present invention, when the structured information is changed, the presentation information may include an event used for detecting the change of structured information.
In this instance, the event may be defined as an IDL in Table 5 as given above.
In this instance, the presentation unit 512 may evaluate the structured information based on the parsing result of the presentation information and may read the changed structured information, thereby presenting a changed scene.
The method according to the above-described example embodiments may be recorded in computer-readable media including program instructions to implement various operations embodied by a computer. The media may also include, alone or in combination with the program instructions, data files, data structures, and the like. Examples of computer-readable media include magnetic media such as hard disks, floppy disks, and magnetic tape; optical media such as CD ROM disks and DVDs; magneto-optical media such as optical disks; and hardware devices that are specially configured to store and perform program instructions, such as read-only memory (ROM), random access memory (RAM), flash memory, and the like. Examples of program instructions include both machine code, such as produced by a compiler, and files containing higher level code that may be executed by the computer using an interpreter. The described hardware devices may be configured to act as one or more software modules in order to perform the operations of the above-described example embodiments, or vice versa.
Although a few embodiments of the present invention have been shown and described, the present invention is not limited to the described embodiments. Instead, it would be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2009-0063980 | Jul 2009 | KR | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/KR2009/003882 | 7/15/2009 | WO | 00 | 1/14/2011 |
| Number | Date | Country | |
|---|---|---|---|
| 61080749 | Jul 2008 | US |
