Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
  • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
  • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
  • H04N19/20—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video object coding
  • H04N19/25—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video object coding with scene description coding, e.g. binary format for scenes [BIFS] compression
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
  • H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards

Definitions

• the present invention relates to a compressed image transmitting method using an
• ISO/IEC MPEG-4 BIFS Binary Format for Scenes
• ISO/IEC MPEG-4 BIFS Binary Format for Scenes
• a compressed image is embedded in a BIFS stream and transmitted using a newly defined CompressedPixelTexture node, thereby reducing the frequency of use of object descriptor (OD) information and enhancing effectiveness of compressed image transmission.
• OD object descriptor
• ISO/IEC MPEG-4 BIFS is a scene description standard for object-based multimedia contents, and is a technique proposed to multiplex and synchronize different elementary streams of video, audio, image, scene description, font and metadata, to freely represent various multimedia, and to interact with the user.
• An object-based multimedia content includes a plurality of media objects, in which case it is necessary to specify their presence in time and space.
• a weather forecast scene can be thought to include media objects such as a weatherman video, background weather map, background song, and weatherman audio.
• To describe a scene having multiple independent objects it is necessary to determine when and where each object appears and disappears. This can be defined using MPEG-4 BIFS.
• BIFS related information is recorded in a binary format to reduce storage volume.
• a BIFS browser normally displays elementary streams in a predetermined order on the scene, and a hierarchy is present between the elementary streams. As widely known, to present a scene, the BIFS browser performs in sequence (1) packet reception, (2) packet decoding, (3) command execution, (4) audio/video object rendering, (5) user interaction (selection or dragging), and (6) connection to a local or external information source.
• DTV digital TV
• DMB digital multimedia broadcasting
• DMB in which broadcasts are mostly delivered through mobile terminals, provides much more pervasive data contents than DTV broadcasting because of mobility and personalization. While DMB has advantages in utilization of data contents over the DTV system, low-capacity terminals such as mobile terminals lacking available resources are normally used to playback BIFS contents. Hence, there is severe limitation on the processing capacity of the processor, consumed power, memory capacity, display size and communication bandwidth.
• a BIFS content authored using existing techniques is normally composed of a BIFS stream including location and size information of images or geometrical figures in a binary coded script format, OD stream describing relations of decoding information upon image, video and audio streams used in a BIFS scene with BIFS scene objects, and streams of an image, video and audio themselves needed to describe object representations.
• the present invention has been made in view of the above problems, and it is an object of the present invention to provide a compressed image transmitting method using an MPEG-4 BIFS stream, wherein in a rich media service using ISO/IEC MPEG-4 BIFS, a compressed image in the JPEG, PNG or TIFF format is embedded in the BIFS stream and transmitted, and thus the number of logical channels are reduced and additional object description information is unnecessary during stream multiplexing, thereby enabling even a low-capacity terminal such as a mobile terminal lacking available resources to receive the rich media service without severe performance limitation.
• the present invention provides a compressed image transmitting method, wherein at least one compressed image to be embedded in a BIFS stream is prepared to compose a scene of a BIFS content supporting the syntax of ISO/ IEC MPEG-4 BIFS; to embed the prepared compressed image in the BIFS stream, a CompressedPixelTexture node is set so as to include one or more object type identifiers, compressed image stream arrays corresponding to the object type identifiers, and a selection indicator pointing to an image to be rendered on the screen when the number of compressed image stream arrays is greater than or equal to 2; a BIFS content including the BIFS stream having the set CompressedPixelTexture node is transmitted, and the transmitted BIFS content is received; and the received BIFS content is run to decompress and playback the embedded compressed image stream array with reference to the object type identifiers and selection indicator of the CompressedPixelTexture node.
• FIG. 1 is a flow chart illustrating a compressed image transmitting method using an
• FIG. 2 is an example of a BIFS content in the XMT-A format including CompressedPixelTexture node of the present invention. Best Mode for Carrying Out the Invention
• FIG. 1 is a flow chart illustrating a compressed image transmitting method using an
• MPEG-4 BIFS stream according to a preferred embodiment of the present invention.
• the preferred embodiment of the present invention includes:
• a compressed image preparation step (SlO) of preparing at least one compressed image to be embedded in the BIFS stream to compose a scene of a BIFS content supporting the syntax of IS(MEC MPEG-4 BIFS;
• a BIFS content transmitting step (S30) of transmitting a BIFS content including the
• a CompressedPixelTexture node is necessary.
• the syntax of current MPEG-4 BIFS does not support the CompressedPixelTexture node to be used herein. Therefore, the applicant of the present application defines the CompressedPixelTexture node, adds the same to the existing syntax of MPEG-4 BIFS, and will submit a contribution document describing the CompressedPixelTexture node of the present invention to the ISO/IEC MPEG-4 standards committee to let the CompressedPixelTexture node to be reflected in the MPEG-4 BIFS standard specification.
• fields of the CompressedPixelTexture node of the present invention specifying the operational attributes thereof, and the behavior thereof are described in detail.
• the definition of the CompressedPixelTexture node includes the definition of a node interface and node binary syntax.
• the node interface defines the structure and function of a node, and is described in compliance with the MPEG-4 BIFS node interface description format.
• the node binary syntax defines a bit string corresponding to the binary representation of a node in a scene tree described in the extensible MPEG-4 textual format- A (XMT-A), and is described in compliance with BIFS node coding tables.
• XMT-A extensible MPEG-4 textual format- A
• the IFS node coding table is represented by a node table illustrated in Table 1 and a node definition type table illustrated in Table 2. Specific meaning of Table 1 and Table 2 can be found in published ISO/IEC MPEG-4 BIFS standards documents, and a detailed description thereof is omitted.
• the imageStream field contains real compressed image streams such as JPEG, PNG, and TIFF streams.
• the 'whichChoice' field is a selection indicator pointing to one of the imageStreams in the form of an array to be rendered on the screen.
• the 'repeats ' field (vertical axis repeat field) indicates whether to repeat drawing of a rendered image in the y-axis direction of screen coordinates.
• the 'repeatT' field (horizontal axis repeat field) indicates whether to repeat drawing of a rendered image in the x-axis direction.
• the node coding table of a CompressedPixelTexture node of the present invention is defined by a node table illustrated in Table 3 and a node definition type table il- lustrated in Table 4.
• a CompressedPixelTexture node is set so as to include one or more object type identifiers, compressed image stream arrays corresponding to the object type identifiers, and a selection indicator pointing to an image to be rendered on the screen when the number of compressed image stream arrays is greater than or equal to 2.
• objects such as geometrical figures and images are represented using a Shape node in BIFS.
• Locations of objects are specified using a Transform2D node, and multiple objects can be represented as a group using an Or- deredGroup node.
• the Shape node has a child node to set the geometrical model and texture of a represented object, and a compressed image is represented through a node applicable to the texture field of the Shape node.
• one JPEG image and one PNG stream are embedded in the BIFS stream using the CompressedPixelTexture node at the texture field.
• the whichChoice field specifies one of the two compressed images to be rendered on the screen, and a value of 0 indicates selection of the JPEG image being the first one of the image streams specified in the imageStream field.
• describing a compressed image stream directly in the BIFS stream obviates additional OD information.
• a BIFS content including the BIFS stream having the set CompressedPixelTexture node is transmitted, and at the BIFS content receiving step (S40), the transmitted BIFS content is received.
• the received BIFS content is run to decompress and playback the embedded compressed image stream array with reference to the object type identifiers and selection indicator of the CompressedPixelTexture node.

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• 2007
  • 2007-06-22 KR KR1020070061705A patent/KR100950082B1/ko not_active IP Right Cessation
• 2008
  • 2008-03-27 WO PCT/KR2008/001710 patent/WO2009002006A1/en active Application Filing

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